Smart Contract Development
Solidity and Rust contracts for lending, staking, vaults, and token systems. Written for auditability first, with full test coverage and documented invariants.
012DeFi Development
A DeFi Development Company That Ships Audited Protocols
Webisoft designs and builds DeFi protocols, from smart contract architecture to frontend, with the security discipline that handling other people's money demands. Montreal-based senior engineers who have been building on-chain since before DeFi had a name.
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What we build
End-to-end DeFi engineering
From tokenomics modeling to mainnet deployment, we cover the full stack of a DeFi product. Every layer is built by the same accountable team, so nothing falls between contracts, backend, and UI.
DEX and AMM Protocols
Custom exchange mechanics, from constant-product AMMs to concentrated liquidity and order-book hybrids. Fee logic, LP incentives, and routing designed around your liquidity strategy.Lending and Yield Platforms
Collateralized lending markets, yield aggregators, and vault strategies with careful liquidation logic and oracle design. The parts of DeFi where mistakes are most expensive get the most engineering attention.Token and Tokenomics Engineering
ERC-20, ERC-721, ERC-4626, and custom token standards, plus vesting, emissions, and governance mechanics. We model the economics before writing the contract, not after.Cross-chain and Integrations
Bridges, messaging layers, and integrations with established protocols like Uniswap, Aave, and Chainlink. Multi-chain deployments across EVM chains and beyond.DeFi Frontends and Infra
Production dApp interfaces, indexers, subgraphs, and monitoring. Wallet flows and transaction UX that ordinary users can survive, backed by infrastructure that stays up during volatility.
How we work
A process built around security and shipped milestones
(4)- 1
Protocol design and economic modeling
We pressure-test your mechanism design, tokenomics, and attack surface on paper before code exists. You get an architecture document covering contracts, oracles, upgrade strategy, and known risk tradeoffs. - 2
Contract development and testing
Contracts are built in short milestones with unit tests, fuzzing, and fork testing against mainnet state. Internal review happens continuously, not as a final gate. - 3
Audit preparation and remediation
We freeze scope, produce audit-ready documentation, and work directly with your chosen external auditors. Findings get fixed and re-verified before anything touches mainnet. - 4
Deployment and post-launch support
Staged mainnet deployment with monitoring, alerting, and an incident runbook. We stay on for parameter tuning, upgrades, and the growth features that come after launch.
Why Webisoft
The difference between a DeFi vendor and a DeFi engineering partner
Plenty of shops can fork a protocol. Fewer can design one that holds up under adversarial conditions with real value at stake.
Security-first engineering
Threat modeling, invariant testing, and audit readiness are part of the build, not an afterthought. We write contracts assuming someone well-funded is trying to break them.Deep blockchain history
Webisoft has been building blockchain systems for years, across smart contracts, infrastructure, and tooling. Your protocol is not our first rodeo on mainnet.Full-stack ownership
Contracts, backend, indexing, and frontend from one senior team. No integration gaps between a contract shop and a separate web agency.North American senior team
Montreal-based engineers working in your time zone with direct communication. The people you talk to are the people writing the code.
FAQ
Questions from teams hiring a DeFi development company
(4)- The main cost drivers are mechanism complexity, the number of contracts, cross-chain requirements, and audit scope. A focused single-mechanism product costs meaningfully less than a full lending market or DEX. Many teams scope the work in phases so the core mechanism can be validated before the full roadmap is funded, with a fixed estimate produced after the design phase. Independent audit fees are a separate line item and scale with the size of the contract surface.
- The audit itself should be performed by an independent third-party firm, not by the team that wrote the code, since self-auditing is a conflict of interest. The development team's job is to arrive at audit with clean, documented, well-tested code so findings are minor and the timeline holds. Serious protocols often layer multiple reviews: internal review, one or two external audits, and sometimes a bug bounty or formal verification for the highest-value components.
- Ethereum remains the center of DeFi liquidity, with the major EVM ecosystems such as Arbitrum, Optimism, Base, Polygon, and BNB Chain hosting a growing share of activity thanks to lower fees. Solana is the main non-EVM option for Rust-based protocols that need high throughput. Chain choice is a design decision driven by where the target users and liquidity are and what the cost profile needs to be, not a default.
- Yes, but it requires care because the contracts are live and hold value. The standard approach starts with a code and architecture review that documents risks and technical debt, then plans upgrades or new features around the deployed contracts. Proxy upgrade patterns, migration design, and staged rollouts are the core techniques for changing a value-bearing system safely without interrupting users or putting funds at risk.
DeFi Engineering Capabilities
Where We Add Value in DeFi Development
DeFi protocols are adversarial systems holding real money, so the engineering standard is different from ordinary software. These are the areas where design decisions determine whether a protocol survives contact with the market.
Protocol and Smart Contract Design
We build lending markets, staking systems, AMMs, and vaults in Solidity or Rust, using audited patterns from OpenZeppelin and battle-tested reference implementations rather than novel code where novelty adds risk. Upgradeability, pausability, and access control are explicit design decisions documented with their trade-offs. The contract architecture is written down before the first line of Solidity.Tokenomics and Incentive Modeling
Emission schedules, fee structures, and liquidity incentives are modeled in spreadsheets and simulations before they are encoded on-chain, because a broken incentive design cannot be patched after launch. We stress-test the economics against mercenary liquidity, low-volume scenarios, and token price drawdowns. You see the failure modes on paper instead of in production.Security-First Development
Every contract goes through static analysis with tools like Slither, a full test suite including fuzzing and invariant tests with Foundry, and an internal review before any external audit. We design for known exploit classes: reentrancy, oracle manipulation, flash loan attacks, and access control failures. We also prepare the codebase and documentation so third-party audits are faster and cheaper, and we manage the audit and remediation cycle with you.Oracle and Price Feed Architecture
Price feeds are the most common root cause of DeFi exploits, so we treat oracle selection as a security decision. We integrate Chainlink and other decentralized oracles, add TWAP fallbacks and sanity bounds where appropriate, and document exactly what happens when a feed goes stale or deviates. Liquidation and collateral logic is tested against manipulated-price scenarios explicitly.Cross-Chain and L2 Deployment
We deploy to Ethereum mainnet, L2s like Arbitrum, Optimism, and Base, and other EVM and non-EVM chains, with a deployment pipeline that keeps addresses, verification, and configuration consistent across networks. Bridge integrations are chosen conservatively because bridges concentrate risk. Chain selection is driven by where your users and liquidity actually are, not by grant announcements.Full-Stack DeFi Products
A protocol is not usable without its interface, so we build the frontend, wallet connections, transaction flows, subgraph or indexer, and analytics dashboards alongside the contracts. Users get clear transaction previews, gas estimates, and error states instead of raw revert messages. The result is a product a non-technical user can operate, not just a set of verified contracts.
Our Approach
How a DeFi Engagement Runs
(4)- 1
Protocol Specification and Economic Review
We start by writing a full protocol specification: mechanisms, actors, invariants, fee flows, and governance powers, plus an economic model of the incentives. This document surfaces design flaws while they cost hours instead of funds, and it later serves as the audit brief. You approve the spec before contract development begins. - 2
Contract Development and Internal Security Review
Contracts are built with test coverage including unit tests, fork tests against live protocols you integrate with, fuzzing, and invariant testing. An engineer who did not write the code reviews it against the spec and a checklist of known exploit classes. Static analysis runs in CI on every commit. - 3
External Audit and Remediation
We prepare the audit package, help you select and schedule a reputable auditing firm, and handle the finding-and-fix cycle, including regression tests for every remediation. Where it fits the risk profile, we also set up a bug bounty and staged deployment with caps on total value locked during the early period. - 4
Launch, Monitoring, and Iteration
Deployment runs through scripted, rehearsed procedures with multisig or timelock control over privileged functions. Post-launch we run monitoring for anomalous transactions, oracle deviations, and treasury movements, with an incident response plan agreed in advance. Then we iterate on the protocol and interface as real usage data comes in.
FAQ
Questions Buyers Ask About DeFi Development
(6)- The budget splits across three areas people underestimate: contract development is often the smallest, while security work, meaning testing, internal review, and external audits, and the full product around the contracts, meaning frontend, indexing, and monitoring, make up the rest. Novel mechanism design costs more than forking an established pattern because the security surface is unproven. External audits from reputable firms are a separate line item that scales with code size and complexity, and we help you scope contracts to keep that bill rational.
- A protocol based on proven patterns typically takes four to seven months including audit, while novel mechanisms take longer because the specification and testing phases cannot be compressed safely. Audit firm scheduling is often the critical path, with good firms booked weeks or months out, so we get in their queue early. Testnet deployment usually happens around the midpoint, so you have something to show partners well before mainnet.
- Layers, because no single measure is sufficient. We use established libraries and patterns, write invariant and fuzz tests, run static analysis in CI, and require independent internal review before any external audit. At the protocol level we design conservative defaults: value caps at launch, timelocks on privileged functions, pause mechanisms, and oracle sanity checks. Audits are necessary but not sufficient, and we will say plainly that no one can guarantee absence of exploits, only a disciplined reduction of their likelihood and blast radius.
- It depends on where your target users and liquidity are, what gas costs your mechanism can tolerate, and which integrations you need, such as specific oracles, DEXs, or lending markets. Ethereum mainnet still carries the most credibility and liquidity for protocols holding large value, while L2s like Arbitrum and Base make sense for high-frequency, lower-value interactions. We usually recommend launching on one chain, proving the model, and expanding rather than fragmenting liquidity across several at once.
- We are engineers, not lawyers, and we are direct about that boundary: you need legal counsel for securities, licensing, and jurisdiction questions, and we can work alongside them. What we contribute is building to whatever constraints counsel sets, such as geoblocking, KYC gates on specific flows, permissioned pools, or clear separation between the protocol and any company-operated frontend. Design decisions with regulatory implications are flagged in the specification so they are made deliberately.
- Launch is the beginning of the operational phase, not the end of the project. We provide monitoring for contract activity, oracle health, and treasury movements, an agreed incident response procedure, and ongoing development for new features and parameter changes through governance. Protocols also accumulate integration requests and fork pressure, so most clients keep a retained team for the first year. Everything, including deploy keys transferred to your multisig, is under your control.
