A shortlist typically within 72 hours, usually contributing inside two weeks, and 30-day replacement support if the fit is wrong (terms in your agreement).
Shortlist typically in 72 hours · 30-day replacement support · Month-to-month
Smart contracts are unusual software. Once deployed, they often can’t be changed, they hold real value, and attackers read them as closely as your team does. Many costly incidents came from small mistakes: an unchecked external call, a flawed access control, a math assumption that didn’t hold.
A senior blockchain developer writes contracts defensively, tests them thoroughly, prepares them for external audit and designs upgrade and emergency paths before launch.
Clear, gas-aware contracts.
Reentrancy, access control and oracle risks understood.
Foundry or Hardhat tests, fuzzing and invariants.
Proxies and governance used carefully.
Front ends, indexers and off-chain services.
Ethereum, Layer 2s and other EVM chains.
Lost funds. Vulnerabilities in contracts can be exploited within minutes of discovery.
Failed audits and delays. Poorly structured code takes longer and costs more to audit.
High gas costs. Inefficient contracts make every user transaction more expensive.
Every engineer we put forward has at least five years of hands-on experience. Within that, here is how the levels differ.
Senior Developer (5–8 years). Writes Solidity contracts with Foundry or Hardhat, builds tests including fuzzing, integrates with front ends using ethers.js or viem, and knows common vulnerability patterns.
Lead / Architect (8+ years). Owns protocol design, upgrade patterns, security reviews, multi-chain deployment and integration with off-chain systems.
Smart contract development. Tokens, vaults, marketplaces and protocol contracts
Audit preparation. Test coverage, documentation and fixes before external audit
dApp integration. Wallet connection, transactions and indexing for front ends
Enterprise and tokenisation. Permissioned ledgers and tokenised asset projects
Week one. They review contracts, tests, deployment scripts and threat model.
Weeks two and three. First contract work or fixes with expanded test coverage.
Week four. A written risk review and audit readiness checklist.
Skipping external audits. Contracts holding value should be independently audited.
Weak test coverage. Fuzzing and invariant tests catch what unit tests miss.
No emergency plan. Plan pause and upgrade mechanisms before launch.
Rates depend on seniority, scope and engagement length. See the cost guide for market ranges, or tell us the role and we will give you a firm number.
Tell us the role and we will typically send a shortlist within 72 hours.
Tell Us the RoleTell us the role. Three to five profiles, typically within 72 hours.