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Blockchain & Web3

DeFi Development Services

The smart contracts, oracles and front ends behind decentralised finance, built as the safety-critical software they are, by engineers who will not ship a protocol that has not been tested and audited to the hilt, and who will not hype a yield.

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What DeFi Development means in practice

Who it’s for: Teams building a genuine decentralised financial protocol (a DEX, a lending market, a staking system), who have the seriousness and the budget to treat security, independent auditing and regulatory compliance as non-negotiable, and who want engineers that will be blunt about risk rather than sell them a yield. Not for anyone whose plan depends on the speculative value of a token, or who sees an audit as an optional line item.

DeFi development means building the software for decentralised financial protocols: decentralised exchanges built on automated market makers, lending and borrowing markets, staking systems, and the smart contracts, price oracles and front ends that make them work. What sets it apart from ordinary software is not the technology but the stakes. These contracts hold value directly, they are immutable once deployed, and they run in the most adversarial environment in all of software: a public arena where anyone in the world can call your functions, read your code, and is financially motivated to break it. That combination makes DeFi the single most attacked area of software there is, and it shapes everything about how we approach the work.

The failures here are not abstract. Flash-loan attacks that borrow enormous sums within a single transaction to distort a market, oracle manipulation that feeds a protocol a false price, reentrancy that drains a contract before its books are updated, and economic or mechanism-design exploits where the maths of the protocol itself can be turned against it: attacks of exactly these kinds have caused losses running into the billions across the industry, most of them irreversible. So rigorous testing, formal verification where it is feasible, multiple independent audits, and careful economic design are not premium extras we upsell. They are the baseline cost of building anything in this domain responsibly, and we will not do the work without them.

There is a second dimension that is just as load-bearing: regulation, and it is moving fast. In the UK the FCA is extending its perimeter over crypto activity; in the EU, MiCA is now in force; and underneath both sit unresolved securities, AML and consumer-protection questions that vary by jurisdiction and change from one quarter to the next. Building a financial protocol has serious legal implications, and we are unambiguous about the boundary of what we provide. Yarqat delivers engineering. We do not give financial, investment or legal advice, we do not promote yields, tokens or returns, and we build only with clients who take security, auditing and compliance every bit as seriously as we do.

What you get

  • A sober feasibility and threat-model assessment first, covering the attack surface, the economic-design risks and the regulatory questions your protocol raises, delivered plainly, including the cases where our honest advice is not to proceed as scoped
  • Smart-contract engineering for the protocol core (AMM/DEX logic, lending and borrowing markets, staking and reward mechanics), written small, built from well-reviewed standard implementations wherever possible, and designed to be audited
  • Oracle and price-feed design, because a protocol is only as trustworthy as the prices it believes: resilient feeds, manipulation-resistant pricing (time-weighted where appropriate), sanity bounds and clear failure behaviour
  • A test suite that goes far beyond the happy path, unit and integration tests, fuzzing and property-based testing, and fork testing against real mainnet state, plus formal verification of critical invariants where the properties allow it
  • Coordination of multiple independent third-party audits, remediation of every finding, and, where warranted, economic review of the mechanism design itself rather than only the code
  • The off-chain surround: the front end and wallet integration that make the protocol usable and that show users the finality and risk they are actually committing to, plus monitoring for on-chain activity after launch
  • Documentation and handover thorough enough that your own team can operate, extend and reason about the protocol safely, because in this domain, a system nobody fully understands is a system waiting to be exploited

What DeFi Development does for you

  • Value that survives contact with the adversary

    The entire point of the engineering discipline we bring is that what we ship holds up in the one environment where everyone can see the code and is paid to break it. Small, standard-first contracts, exhaustive testing, formal verification of critical invariants and multiple independent audits are not there to impress you: they are there so a reentrancy flaw or an arithmetic error does not become an irreversible, unrecoverable loss of your users’ funds. In DeFi the benefit of doing security properly is not speed or polish; it is the difference between a protocol that runs for years and one that becomes a headline.

  • Prices the protocol can actually trust

    A staggering share of DeFi losses trace back not to the core logic but to the oracle. The price feed the protocol relies on to value collateral, price swaps or trigger liquidations. Manipulate the price for one transaction and you can drain a market that was otherwise sound. We design oracles as a first-class security concern: resistant to flash-loan-driven manipulation, time-weighted or multi-source where the risk warrants it, bounded against implausible values, and explicit about how the protocol behaves when a feed is stale or unavailable. Getting this right removes one of the most common and most expensive failure modes in the field.

  • A protocol built with the regulator in the room

    Building a financial protocol without regard for the legal environment is how projects end up rebuilt, restricted or shut down. While we do not give legal advice, we engineer with the regulatory reality in mind: the FCA’s expanding perimeter in the UK, MiCA in the EU, and the AML and securities questions underneath, and we make sure you are getting proper legal counsel rather than assuming the code speaks for itself. The benefit is a protocol whose engineering decisions are compatible with the compliance obligations you will actually face, instead of a technical fait accompli that your lawyers then have to unpick.

Why teams choose us for DeFi Development

  • You are building a genuine financial protocol and want it treated as safety-critical software (exhaustively tested, formally verified where possible, and put through multiple independent audits), rather than shipped fast and hoped over.
  • You understand that the oracle is as dangerous as the core logic, and you want price feeds engineered against manipulation from the start rather than bolted on with a single source and crossed fingers.
  • You want engineers who take the economic and mechanism design as seriously as the code, because in DeFi the maths of the protocol is part of the attack surface and a system can be perfectly coded and still exploitable.
  • You want a partner who is honest about risk and regulation, keeps strictly to engineering, and will not promote yields, tokens or returns, and who will tell you plainly when the sober answer is not to proceed as scoped.

What DeFi Development includes

The concrete pieces of work this covers, scoped to what your problem actually needs.

  • Threat modelling and economic risk review

    Before any protocol code is written, we map the full attack surface (flash loans, oracle manipulation, reentrancy, front-running and MEV, governance capture), and interrogate the economic design itself: what happens under extreme volatility, at the liquidation edge, or when an attacker controls a large position. In DeFi a contract can be flawlessly implemented and still exploitable because the mechanism it implements is unsound, so we treat this economic review as core engineering rather than an afterthought.

  • AMM and decentralised exchange engineering

    We build the core logic of automated market makers and decentralised exchanges (pricing curves, liquidity provision, swap execution, fee accounting and slippage protection), with careful attention to the failure modes specific to them: sandwich attacks, impermanent-loss surprises for liquidity providers, and rounding or precision errors that compound into real value over many transactions. We favour well-reviewed patterns over novel curves unless novelty is genuinely justified and can be proven safe.

  • Lending and borrowing protocols

    Collateralised lending markets live or die on their liquidation logic and their price oracles. We engineer the accounting, interest-rate models, collateral factors and liquidation mechanics that keep a market solvent under stress, and we design the oracle dependency with the knowledge that a manipulated price is the classic way these protocols are drained. The hard cases (cascading liquidations, bad debt, oracle latency during a crash), are designed for deliberately, not discovered in production.

  • Staking and reward mechanics

    Staking, yield distribution and reward-accrual systems are deceptively subtle: the arithmetic of distributing rewards fairly across changing balances is a frequent source of precision bugs and economic exploits. We build these mechanisms with careful, tested accounting and a clear-eyed view of how they can be gamed. We implement the mechanics as engineering; we do not model, promise or promote returns, and we are explicit that reward rates are a protocol parameter, not an investment prospect.

  • Oracle and price-feed design

    Because so many DeFi failures are oracle failures, we treat price feeds as a security-critical subsystem in their own right. We integrate established oracle networks where appropriate, design time-weighted and multi-source pricing to resist single-block manipulation, add sanity bounds against absurd values, and define exactly how the protocol degrades when a feed is stale, deviates wildly or goes offline, so a bad price fails safe rather than draining the system.

  • Testing, formal verification and audit coordination

    Our verification goes well beyond example-based tests: property-based testing and fuzzing to hunt for the inputs a human would not think of, fork testing against real mainnet state, and formal verification of critical invariants (such as "the protocol can never pay out more than it holds"), where the properties admit it. On top of our own work we coordinate multiple independent third-party audits, drive remediation of every finding to closure, and treat the audit as a gate the protocol must pass, not a certificate to collect.

Where it fits

  • A decentralised exchange built on an AMM

    A team building a DEX that lets users swap assets and provide liquidity without a central operator. We engineer the AMM core (pricing, liquidity, fees, slippage protection), with explicit defences against sandwich attacks and MEV, exhaustive testing of the swap and rounding logic, and multiple audits before it touches real liquidity. The front end shows users the price impact and finality they are committing to rather than hiding it.

  • A collateralised lending market

    A protocol where users deposit collateral to borrow against it, with liquidations keeping the market solvent. The central engineering risk is the oracle and the liquidation path, so we design manipulation-resistant pricing, model the behaviour under a sharp price crash and cascading liquidations, and stress the accounting against bad-debt scenarios. Every assumption about how the market stays solvent is tested and audited, because the failure here is insolvency, not an error message.

  • A staking and reward system

    A protocol that lets users stake assets and accrue rewards over time. We build the reward-accrual accounting with the precision it demands, test it against the edge cases where distribution maths tends to break, and design against the ways staking systems are gamed. We implement the mechanism faithfully and describe it honestly as a mechanism. We do not promise or promote yields, and we make sure the risks are stated to users plainly rather than buried.

  • Auditing or hardening an existing DeFi protocol

    A team with a protocol already written or deployed (perhaps in a hurry, perhaps by a previous team), that needs an independent, adversarial review before it holds serious value, or after a near-miss. We threat-model the whole system, review the contracts and the oracle design for the known attack classes and the economic ones, and give a prioritised account of what must be fixed. Sometimes the honest finding is that a redesign is safer than a patch on an immutable deployment.

How we approach DeFi Development

We start from the attacks, not the features. Before we design a single contract we build the threat model: every way value could leave the system, every price the protocol trusts, every assumption in the economic design, because in DeFi the adversary is not a hypothetical. The code is public, the incentive to break it is enormous, and the attackers are sophisticated and relentless. That posture means we say no to shortcuts other firms wave through: we do not ship without exhaustive testing, we do not treat a single audit as sufficient for a protocol holding real value, and we do not accept an oracle design that a flash loan could distort. If a client is not prepared to fund security to that standard, we are candid that we are not the right firm for the work.

When we do build, we settle the load-bearing decisions: the economic model, the oracle strategy, the upgrade and admin-key design, the regulatory questions to put to your lawyers, before writing production code, because these are the choices that are ruinous to reverse once value is at stake and the contracts are immutable. Then we build in short cycles with testing and verification running alongside, keeping contracts small and preferring proven patterns to clever ones. Nothing touches real value until it has passed our own verification and multiple independent audits with every finding remediated. The engineers who design the protocol are the ones who review and monitor it, so we build for years of safe operation and a team that can own it, not a launch that dazzles and then has to be defended in an incident channel.

How an engagement runs, threat model to post-launch monitoring

Everything begins with the threat model and the economic review, and this is the phase we most want you to take seriously, because it is where a protocol is made safe or left exploitable. We map the attack surface exhaustively (flash loans, oracle manipulation, reentrancy, MEV, governance and economic exploits), and pressure-test the mechanism design against extreme conditions rather than the average case. We surface the regulatory questions your protocol raises so you can put them to proper legal counsel early. If the honest conclusion is that the design cannot be made safe as scoped, or that the compliance position is untenable, you hear that now, before money has been spent building it.

From there we build the core in short cycles, keeping contracts small and testing continuously (unit, integration, property-based fuzzing and fork testing against real mainnet state), with formal verification of critical invariants where the properties allow. Before anything is deployed against real value it passes multiple independent third-party audits, and we drive every finding to closure rather than filing them. After launch the work is not over: DeFi protocols live in an adversarial environment permanently, so we set up monitoring for anomalous on-chain activity and hand over documentation and runbooks thorough enough that your team can operate the protocol and respond to incidents without depending on us.

Protocol contracts, oracles and the risk of composability

The architecture of a DeFi protocol is defined by three things: the contracts that hold the logic and the value, the oracles that tell those contracts what the outside world costs, and the fact that the whole thing sits in a composable, permissionless environment where other protocols can and will build on top of it. The core contracts we keep small, composable and built from well-reviewed standard implementations, with the upgrade and administrative-key model decided deliberately up front: immutability is a security property you architect around, and the power to upgrade or pause a protocol is itself an attack surface that must be designed with the same care as the rest. The oracle is treated as a critical subsystem rather than a data source: how prices are sourced, how they resist single-transaction manipulation, and how the protocol behaves when a feed fails are all first-class architectural decisions, because a protocol is only ever as trustworthy as the prices it believes.

The harder, subtler dimension is composability risk. DeFi protocols are designed to interoperate: your protocol can be called by anyone, can integrate other protocols, and can be assembled by third parties into combinations you never anticipated. That composability is a genuine strength and a genuine hazard: it is exactly what flash-loan attacks exploit, borrowing vast sums within a single atomic transaction to distort a market or an oracle and then repaying within the same transaction, all without capital. It means your protocol’s safety depends not only on your own code but on the behaviour of every protocol it touches and every protocol that touches it. We architect with this in mind, minimising trust in external calls, guarding against reentrancy across integrations, and treating every external price and every external contract as potentially hostile, because in a composable system, an assumption that another protocol will behave is an assumption an attacker will test.

The attack classes, and why the lifecycle is audit-heavy by necessity

DeFi security is a discipline of its own because the attack classes are specific, well-understood by attackers, and unforgiving. Reentrancy, where a contract is re-entered before its own state is updated, has drained protocols from the earliest days and still does. Oracle manipulation feeds a contract a false price to make it act against itself. Flash-loan attacks combine borrowed capital and composability to distort markets within a single transaction. Front-running and MEV let sophisticated actors reorder or sandwich transactions for profit at users’ expense. And the hardest class of all is economic and mechanism-design exploits, where the contract does exactly what it was written to do but the design itself can be turned against the protocol: perfectly coded, still drainable. Because deployed contracts are immutable and hold value directly, a single instance of any of these can mean irreversible, unrecoverable loss, which is why the industry’s losses run into the billions and why we treat each class as a thing to be designed against, not patched after.

That reality is what makes the lifecycle audit-heavy, and deliberately so. Our own verification: property-based fuzzing, fork testing against real state, formal verification of critical invariants where feasible, comes first, but we do not treat it as sufficient. A protocol that will hold real value goes through multiple independent third-party audits, because different auditors find different things and one audit is not a guarantee; and we remediate every finding and re-review rather than shipping with known issues noted. Where the risk warrants it, we commission economic review of the mechanism design separately from the code audit, because the two failure modes are different. We are also blunt about the limits of all this: no audit makes a protocol safe in the absolute, security is continuous rather than a one-time gate, and the honest posture is layered defence, post-launch monitoring, and a readiness to respond, not a certificate that declares the problem solved.

Our stance: security and honesty above shipping speed

The methodology rests on a single conviction: DeFi is the highest-risk software domain there is, and it must be engineered accordingly or not at all. Everything downstream follows from that. We lead with the threat model and the economic review rather than the features; we build contracts small and from proven patterns rather than clever ones; we test exhaustively and verify formally where we can; and we treat multiple independent audits as a gate the protocol must pass, not a badge it collects. We take this work on only with clients who share that seriousness, who budget for security and auditing properly and who regard compliance as fundamental, and we are willing to walk away from those who do not, because half-secured DeFi is not a smaller version of the same thing, it is a liability with a countdown on it.

The second half of the stance is honesty about what we are and are not. We build engineering, full stop. We do not give financial, investment or legal advice; we do not model, promise or promote yields, tokens or returns; and we are explicit that the regulatory environment: the FCA in the UK, MiCA in the EU, and the securities and AML questions underneath, is real, evolving and something you must address with proper legal counsel, not something the code resolves on your behalf. Where a protocol is sound, needed and built by a team that takes the risk as seriously as we do, we will build it to a standard that holds up under attack. Where the plan depends on hype, on a token’s speculative value, or on skimping the security that this domain makes non-negotiable, we will tell you plainly that we are not the firm for it.

Technologies we build it with

Chosen per problem, not per fashion. This is the stack we most often reach for on this work.

How we deliver

  1. 01

    Discover

    We map the system, the constraints and the business it serves, including the parts nobody documented.

    Architecture brief

  2. 02

    Architect

    Decisions get made, written down and defended before a line of production code exists.

    Decision records

  3. 03

    Build

    Short cycles against working software. You see progress in the product, not in a status deck.

    Shipping increments

  4. 04

    Operate

    Monitoring, incident response and iteration. The system is alive, so the engagement is too.

    Runbooks & SLOs

Want a straight answer on DeFi Development?

A short call with a senior engineer, before you write a brief. If DeFi Development is the wrong answer for your situation, we will say so and tell you what we think is right.

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What changes

  • A protocol that holds up under attack

    Contracts engineered as safety-critical software, small, standard-first, exhaustively tested, formally verified where possible, and passed through multiple independent audits, so the value they hold survives an environment where everyone can read the code and is paid to break it.

  • Manipulation-resistant pricing

    Oracles designed as a security-critical subsystem, resistant to single-transaction manipulation, bounded against absurd values, and explicit about failing safe, removing one of the most common and most expensive failure modes in all of DeFi.

  • Engineering aligned with compliance

    A protocol built with the evolving regulatory reality in mind and the legal questions surfaced early for your counsel, so your engineering decisions are compatible with the obligations you will actually face, not a technical fait accompli your lawyers must later unpick.

Industries we serve

Domain knowledge changes what gets built. A few of the sectors we know before the first meeting.

How pricing works

  • A paid threat-model and feasibility assessment first, covering the attack surface, the economic-design risks and the regulatory questions your protocol raises. This is frequently the most valuable stage, and when the honest conclusion is that the design cannot be made safe or compliant as scoped, this is where you find out, before a build budget is committed.
  • Fixed-scope builds for well-defined protocols such as a defined AMM, a lending market or a staking system, quoted once the economic model, the oracle strategy and the security scope are settled, with the cost of exhaustive testing and multiple independent audits stated explicitly rather than hidden, because in this domain security is not the line item to trim.
  • Focused smart-contract audits and adversarial security reviews of existing DeFi code, priced by assessment, because an unaudited protocol deployed against real value is an open-ended, irreversible liability and the review is worth doing entirely on its own.
  • Monthly senior engagement for protocols that evolve and must be monitored and defended continuously after launch, giving you continuity from the same engineers who designed the protocol, understand its threat model, and can respond when the adversarial environment tests it.

Typical timeline

  1. 01

    Threat model, economic and regulatory review

    Typically two to four weeks mapping the full attack surface, pressure-testing the mechanism design against extreme conditions, and surfacing the regulatory questions to put to your legal counsel. This is where a protocol is made safe or shown to be unsafe as scoped, and it is the phase we least want compressed.

  2. 02

    Core protocol build and continuous testing

    Feature-by-feature delivery of the protocol core in short cycles (AMM, lending, staking or their combination), with unit, integration, property-based fuzzing and fork testing running alongside the code rather than after it, and formal verification of critical invariants where the properties allow.

  3. 03

    Independent audits and remediation

    Multiple independent third-party audits, with every finding driven to closure and re-reviewed, plus separate economic review of the mechanism design where the risk warrants it. Nothing touches real value until this gate is passed. The audit is not a certificate, it is a condition of deployment.

  4. 04

    Deployment, monitoring and handover

    Careful deployment, on-chain monitoring for anomalous activity, and handover with documentation and incident runbooks thorough enough that your team can operate and defend the protocol. In DeFi the adversarial environment is permanent, so the work does not end at launch. It changes shape.

What working with us actually means

  • We treat DeFi as the highest-risk software there is

    This is the single most attacked area in software, and we engineer accordingly: threat model first, contracts small and standard-first, exhaustive testing and formal verification, and multiple independent audits as a gate rather than a badge. We take the work on only with clients who fund security to that standard, because half-secured DeFi is a liability with a countdown, not a cheaper version of the real thing.

  • Senior engineers on unforgiving, immutable code

    DeFi punishes guesswork more than almost any field: a reentrancy flaw, a manipulated oracle or an economic-design mistake can drain a protocol irreversibly, and a deployed contract cannot simply be patched. The people modelling your threats, designing your oracles and reviewing your mechanism are experienced engineers who know the failure modes, not juniors learning them at your users’ expense.

  • We operate and defend what we build

    The adversarial environment does not end at launch, so we design for years of safe operation and continuous defence, monitoring, incident runbooks, and a team that can respond. We build protocols to be owned and defended, not demonstrations that impress once and then have to be salvaged when the attackers arrive.

  • Engineering only, no yields, no advice, no hype

    We build the software behind decentralised finance; we do not give financial, investment or legal advice, and we do not model, promise or promote yields, tokens or returns. We implement reward mechanics faithfully and describe them honestly as mechanisms, we emphasise security and regulation heavily, and if a plan depends on a token’s speculative value we are candid that we are not the right firm for it.

How to engage us

Three ways to work with us on this, chosen to fit the problem, not our margin.

Related services

Part of Digital Transformation. Other work we do alongside this.

Common questions

Why is security such a dominant part of everything you say about DeFi?

Because DeFi is the single most attacked area in all of software, and the losses have run into the billions. Most of them irreversible. These contracts hold value directly, their code is public, they are immutable once deployed, and anyone in the world can call them and is financially motivated to break them. That is not a normal software risk profile; it is closer to safety-critical engineering. Flash-loan attacks, oracle manipulation, reentrancy and economic-design exploits have each drained real protocols, and a deployed contract usually cannot be patched. So rigorous testing, formal verification where feasible, careful economic design and multiple independent audits are not premium extras we upsell. They are the baseline cost of doing this responsibly, and we will not build without them.

One audit is expensive. Why do you insist on multiple independent audits?

Because a single audit is not a guarantee, and in a domain where a missed bug can mean irreversible loss of your users’ funds, betting everything on one review is a false economy. Different auditors have different specialities and find different things; what one misses another may catch. Our own verification comes first: property-based fuzzing, fork testing against real mainnet state, and formal verification of critical invariants where the properties allow, but we treat multiple independent third-party audits as a gate the protocol must pass before it holds real value, and we remediate every finding and re-review rather than shipping with known issues noted. We are also honest that even this does not make a protocol absolutely safe: security is continuous, and layered defence plus post-launch monitoring is the realistic posture, not a certificate that declares the problem solved.

What exactly is an oracle, and why do you treat it as such a big risk?

An oracle is how a smart contract learns what things cost in the outside world. The price it uses to value collateral, price a swap or trigger a liquidation. It matters enormously because a protocol is only as trustworthy as the prices it believes, and a large share of DeFi losses trace back not to the core logic but to the oracle. If an attacker can manipulate the price a protocol reads, even for a single transaction, they can make an otherwise sound system act against itself and drain it, and composability plus flash loans make exactly that kind of single-block manipulation possible without capital. So we design oracles as a security-critical subsystem: resistant to single-transaction manipulation, time-weighted or multi-source where the risk warrants, bounded against implausible values, and explicit about how the protocol fails safe when a feed is stale or offline.

Can you help us design a token or a yield strategy to attract users?

No, and the boundary matters. Yarqat is a software and AI engineering consultancy: we build the software behind decentralised financial protocols, but we do not give financial or investment advice, and we do not model, promise or promote yields, tokens or returns. Where a protocol genuinely needs staking or reward mechanics, we implement the accounting faithfully and describe it honestly as a mechanism with a parameter, not as an investment prospect, and we make sure the risks are stated to users plainly rather than buried. What a token might be worth, or whether anyone should expect a return, is outside what we do and outside what we will comment on. If a plan depends on the speculative value of a token or on marketing a yield, we are candid that we are not the right firm for it.

How do you handle the regulatory and legal side of building a financial protocol?

Carefully, and within a firm boundary: we provide engineering, not legal advice. The regulatory environment for DeFi is serious and moving fast: the FCA is extending its perimeter over crypto in the UK, MiCA is now in force in the EU, and underneath both sit unresolved securities, AML and consumer-protection questions that vary by jurisdiction. Building a financial protocol has real legal implications, so we surface the regulatory questions your design raises early and make sure you are getting proper legal counsel rather than assuming the code resolves them. We then engineer with that reality in mind, so your technical decisions are compatible with the obligations you will face. What we will not do is pretend the compliance question away, or proceed with a client who treats it as an afterthought.

Thinking about DeFi Development?

Tell us the problem in your own words, not in requirements. A senior engineer reads it and comes back with a straight view on whether DeFi Development is the right answer here, or what would be.

  1. 01A senior engineer reads it. Not a form queue, and not an account manager.
  2. 02We reply either with questions or with a straight answer that we are not the right fit.
  3. 03If it looks like a fit, a technical call with the person who would actually run the delivery.
  4. 04Then scope, effort and risk in writing, before anyone signs anything.
Or book a free consultationPick a time that suits you. No pitch, no obligation.Prefer email? support@yarqat.com

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