Hire Vetted Blockchain Developers
Every engineer passes a live smart contract security and architecture screen covering Solidity reentrancy patterns, gas optimisation, DeFi protocol design, Layer 2 trade-offs, and Web3 frontend integration. No quiz. Real depth only.
72 hrs
Shortlist
Flat 15%
Fee
14-day
Guarantee
Top 5%
Accepted
Smart Contract Deploy Pipeline
Marcus T.
$120-155/hrDeFi Protocol · Solidity · Ethereum
Bogdan P.
$110-145/hrSmart Contract Security · Auditing
Priya S.
$65-85/hrWeb3 Frontend · ethers.js · wagmi
Blockchain Hiring That Actually Vets.
Web3 is the most faked skillset in the developer market. Live coding screens, chain-specific matching, and managed delivery are the only answer.
CV Fraud Is Web3's Biggest Hiring Problem - We Fix It
Web3 job boards are flooded with developers who copy-paste Solidity snippets and claim senior expertise. Every engineer we place passes a live 90-minute technical screen. No exceptions. That's why we reject 97% of applicants.
Matched in 72 Hours - No Web3 Job Board Chaos
Post your brief and receive 3 pre-vetted blockchain engineers in 72 hours. No reviewing unverified web3.career or CryptoJobs profiles. No candidates who have never deployed a contract to mainnet.
Flat 15% - Not Recruiter Double-Digit Markup
Specialist Web3 recruiters charge 20-30% placement fees on annual salary. We charge a flat 15% on the hourly rate - no placement fee, no matching cost. One transparent fee covering vetting, contracting, and delivery management.
Chain-Matched, Not Generalist Placed
A Solidity/EVM specialist and a Rust/Solana engineer are completely different skill sets. We match on your exact chain - Ethereum, Solana, Polygon, Bitcoin L2s - and the domain: DeFi, NFT, tokenization, or audit.
Managed Delivery for Audit-Grade Work
Smart contract engagements need milestone-based delivery, not just hourly billing. We include weekly delivery reports, audit checkpoint milestones, and dispute resolution on every engagement - so you pay for shipped, tested code.
No Lock-In, Full IP Ownership From Day One
No long-term contracts. No exit penalties. All smart contract code, deployment keys, and audit reports transfer to you on day one through a tri-party contract. 14-day notice to end - always.
Engineers Who Have Shipped On-Chain.
Anonymised sample profiles. Every developer shown has passed our live technical screen and has verifiable on-chain deployments - not just portfolio claims.
Marcus T.
8 yrs experience
DeFi Protocol Engineer · Ethereum
Rate
$120-160/hr
Track Record
3 mainnet DeFi protocols
Bogdan P.
6 yrs experience
Smart Contract Auditor · EVM
Rate
$130-180/hr
Track Record
40+ audits completed
Arjun M.
4 yrs experience
Solana Program Engineer · Anchor
Rate
$100-140/hr
Track Record
2 mainnet Solana programs
Mia K.
5 yrs experience
Polygon / L2 Engineer · EVM
Rate
$90-130/hr
Track Record
Polygon mainnet dApps
Priya S.
5 yrs experience
Web3 Full-Stack · ethers.js + wagmi
Rate
$80-120/hr
Track Record
10+ dApp frontends
Liam O.
7 yrs experience
Bitcoin L2 · Lightning · Taproot
Rate
$110-150/hr
Track Record
Lightning node infrastructure
Profiles are anonymised. Real names, chain addresses, and deployed contract links are shared after brief submission and NDA.
From Brief to Vetted Engineer in 72 Hours.
A process built for Web3's unique hiring risks - where unverified portfolios and CV fraud cost projects months of delay and thousands in rework.
Post Your Brief
Tell us your chain (Ethereum, Solana, Polygon, Bitcoin L2), domain (DeFi, NFT, tokenization, audit), seniority level, and timeline. Takes 5 minutes.
Chain · Domain · Seniority · Timeline · Budget
Live Vetting Screen
Every candidate goes through a 90-minute live technical screen: Solidity/Rust coding, security exploit patterns, gas optimisation (EVM) or compute unit optimisation (Solana), and domain-specific architecture.
Live code · Security patterns · Chain-specific · No quiz
Receive 3 Matched Profiles
Within 72 hours you receive a shortlist of 3 domain-matched engineers - with verified on-chain contract addresses, rate, availability, and timezone. You choose who to interview.
72 hrs · Chain-matched · Verified deployments
Managed Delivery Starts
Once you select an engineer, managed delivery begins immediately: weekly status reports, audit milestones, IP protection via tri-party contract, and a 14-day free replacement guarantee. Delivery includes a static analysis audit trail (Slither or MythX report) documenting all flagged issues and their resolution status, contract verification on Etherscan (or equivalent block explorer) so the source code is publicly auditable, and multisig ownership transfer confirming the client controls all admin keys before the engagement closes.
Weekly reports · Audit milestones · 14-day guarantee
Which Chain Does Your Project Need?
Not all blockchain developers are interchangeable. Ethereum, Solana, Polygon, and Bitcoin L2s require fundamentally different language skills, toolchains, and security knowledge.
Ethereum / EVM
- Language
- Solidity · Vyper
- Core Tools
- Hardhat · Foundry · Truffle · Remix
- DeFi Ecosystem
- Uniswap AMMs · Aave · MakerDAO · Compound
- NFT Standard
- ERC-721 · ERC-1155 · ERC-6551
- Scaling / L2
- Arbitrum · Optimism · Base · zkSync
- Primary Security Concern
- Reentrancy · Delegatecall · Oracle manipulation
- Vetting Signal
- Verified contract on Etherscan
Solana
- Language
- Rust · Anchor
- Core Tools
- Anchor CLI · SPL CLI · Solana CLI · Bankrun
- DeFi Ecosystem
- Raydium · Orca · Marinade · Jupiter
- NFT Standard
- Metaplex · Candy Machine · Bubblegum cNFTs
- Scaling / L2
- Native throughput - 65,000 TPS theoretical
- Primary Security Concern
- Signer checks · PDA collisions · CPI re-entrancy
- Vetting Signal
- Program ID on Solana Explorer
Polygon
- Language
- Solidity (EVM-compatible)
- Core Tools
- Hardhat · Foundry · Polygon SDK · CDK
- DeFi Ecosystem
- QuickSwap · Aave Polygon · Balancer
- NFT Standard
- ERC-721/1155 on Polygon · PoS bridge assets
- Scaling / L2
- Polygon zkEVM · CDK sovereign chains
- Primary Security Concern
- EVM exploits + cross-chain bridge risk
- Vetting Signal
- Contract on Polygonscan
Bitcoin L2s
- Language
- Rust · Python · C · Bitcoin Script
- Core Tools
- Lightning Dev Kit · BTCPay Server · Taproot tools
- DeFi Ecosystem
- Discreet Log Contracts · RGB finance
- NFT Standard
- Ordinals · Taproot Assets · BRC-20 tokens
- Scaling / L2
- Lightning Network · Ark · Liquid Network
- Primary Security Concern
- Script vulnerabilities · Timelock bugs · HTLC issues
- Vetting Signal
- Node/channel history + open-source contributions
Not sure which chain fits your project? Describe your use case in the brief - our matching team will recommend the right chain and seniority level based on your throughput, cost, and ecosystem requirements.
What Are You Building?
Each Web3 domain demands a different specialist. The right match depends on your use case - not just on “blockchain developer” as a job title.
DeFi Protocol
AMMs, lending protocols, yield aggregators, staking vaults, and liquid staking tokens. Ethereum and Solana are the primary chains; audit security is mandatory.
Common Work Items
- › Uniswap-style AMM
- › Aave-style lending
- › Yield aggregator
- › Staking vault
NFT Infrastructure
Minting engines, royalty enforcement, marketplace contracts, ERC-6551 token-bound accounts, and Metaplex/Candy Machine deployments.
Common Work Items
- › Minting contract
- › Royalty enforcement
- › On-chain marketplace
- › ERC-6551 accounts
Tokenization / RWA
Real-world asset tokenization, security tokens (ERC-1400/ERC-3643), on-chain cap table management, and fractionalised asset protocols with compliance hooks.
Common Work Items
- › ERC-3643 security tokens
- › On-chain cap table
- › Asset fractionalisation
- › KYC hooks
CBDC / Enterprise
Permissioned EVM networks, KYC-gated token transfers, OFAC screening hooks, and programmable money with central bank governance controls.
Common Work Items
- › Permissioned network
- › KYC-gated transfers
- › OFAC screening
- › Governance controls
Cross-Chain Bridges
Wormhole and Chainlink CCIP integrations, multi-sig bridge custody, lock-and-mint token bridges, and cross-chain messaging protocols.
Common Work Items
- › Wormhole integration
- › CCIP messaging
- › Lock-and-mint bridge
- › Multi-sig custody
Web3 Gaming
On-chain game logic, ERC-6551 token-bound character accounts, Metaplex NFT items, play-to-earn mechanics, and verifiable randomness (Chainlink VRF).
Common Work Items
- › On-chain game logic
- › ERC-6551 characters
- › VRF randomness
- › P2E mechanics
Smart Contract Security Is Non-Negotiable.
DeFi exploits from undetected vulnerabilities have cost billions. For tokenization and CBDC work, a single access control bug can be catastrophic. Our vetting screen tests engineers against real exploit classes - not hypotheticals.
Common Exploit Classes
What our live screen tests candidates on
Reentrancy
Classic + read-only reentrancy across external calls
Arithmetic Overflow/Underflow
Unchecked math in pre-0.8 Solidity and Rust u64 wrapping
Access Control Misuse
Broken Ownable, missing RBAC, initialiser exposed
Delegatecall to Untrusted
Proxy storage collision and malicious implementation logic
Oracle Price Manipulation
Spot price abuse in DeFi, missing TWAP validation
Flash Loan Attacks
Single-transaction liquidity exploits for price/balance abuse
Signature Replay
Missing nonce, chain ID, or deadline in permit functions
Front-Running / MEV
Slippage bypass, sandwich attacks, unprotected deadline
Our Audit-Grade Vetting Process
5 layers - not just a quiz
Slither + Aderyn
Static analysis for known vulnerability patterns across the entire codebase - not just the entry point
Echidna / Foundry Invariants
Property-based fuzz testing with automatically generated inputs to break invariant assumptions
Halmos Formal Verification
Symbolic execution for critical invariants - token supply conservation, access control boundaries
Live Code Walkthrough
90-minute manual review in the vetting screen - candidate explains every security decision live
Mainnet Deployment Review
We verify deployed contract addresses on Etherscan/Solscan - not just code, actual on-chain history
For tokenization and CBDC engagements, all engineers are additionally screened on ERC-3643 compliance hooks, access-control governance patterns, and permissioned transfer logic.
Solidity vs Rust: Which Does Your Project Need?
These are fundamentally different programming paradigms, not interchangeable skill sets. The choice determines your developer pool, security tooling, and ecosystem fit.
Ethereum · Polygon · L2s
Solana · Bitcoin L2s
Execution model
Stateful contracts - state lives inside the contract
Stateless programs - state lives in external accounts
Language learning curve
Medium - JS-like syntax, large tooling ecosystem (Hardhat, Foundry)
High - borrow checker, ownership model, no garbage collection
Ecosystem maturity
Very mature - OpenZeppelin audited libraries, formal verification tools
Growing - fewer audited primitives, active Anchor/Solana Foundation support
DeFi TVL dominance
~60% of total DeFi TVL across Ethereum + L2s
~8-10% of DeFi TVL; growing rapidly on Solana
Transaction cost
Variable gas - Ethereum L1 $2-50; L2s reduce to ~$0.01
Deterministic - ~$0.00025/tx on Solana regardless of load
Vetting signal
Deployed + verified contract on Etherscan is independently confirmable
Deployed program ID on Solana Explorer with on-chain transaction history
Best project fit
Token issuance, enterprise DeFi, regulated tokenization, large NFT collections
High-throughput dApps, consumer payments, gaming, high-frequency DeFi
A developer who claims expertise in both Solidity and Rust/Anchor without significant on-chain shipping history in both is almost always overstating at least one. Our live screen verifies which chain they actually know - before you hire.
Junior vs Mid vs Senior: Which Level Do You Need?
Hiring a senior blockchain architect for token deployment triples your cost. Here is exactly what each tier delivers - and what they cannot own.
Junior
$45-$75/hr1-3 years experience
What They Can Do
- Writes basic Solidity contracts using OpenZeppelin standards (ERC-20, ERC-721, Ownable)
- Deploys and verifies contracts on testnets using Hardhat or Foundry
- Understands ABI encoding and basic ethers.js/viem frontend integration
- Writes unit tests for smart contracts with >80% coverage
- Reads and interprets audit reports; applies recommended fixes under guidance
- Familiar with IPFS for NFT metadata storage and basic Chainlink price feeds
Typical Responsibilities
- Implementing well-specified ERC-20/721/1155 tokens from requirements
- Writing test suites for existing contracts with clear inputs and outputs
- Frontend Web3 integration following established patterns
- Minor bug fixes and gas optimisation under senior review
Not Suited For
Protocol architecture, audit ownership, proxy upgrade design, DeFi economics
Mid-Level
$80-$140/hr3-5 years experience
What They Can Do
- Designs and implements upgradeable proxies (UUPS, Transparent, Beacon patterns)
- Gas-optimises contracts using storage packing, assembly where appropriate
- Implements multi-sig and role-based access control for production protocols
- Integrates Chainlink VRF, CCIP, and Automation in DeFi and gaming contexts
- Writes property-based fuzz tests with Foundry invariant testing
- Familiar with Solana Anchor framework - PDA design, CPI patterns, SPL token ops
Typical Responsibilities
- Full DeFi feature development: staking, vesting, escrow contracts
- NFT infrastructure: royalty enforcement, minting mechanics, marketplace contracts
- Cross-chain integrations with Wormhole or CCIP
- Contract testing with real transaction simulation and edge case coverage
Not Suited For
Leading formal verification, designing novel AMM mechanics, audit report ownership
Senior / Lead
$140-$200/hr5+ years experience
What They Can Do
- Architects full DeFi protocol suites: AMMs, lending, yield, governance from scratch
- Deep audit expertise: reentrancy, delegatecall, oracle manipulation, MEV exposure
- Designs formal verification specs using Halmos or Certora Prover for critical invariants
- Implements DAO governance: on-chain voting, timelock execution, vote-escrow mechanics
- Designs tokenomics and DeFi economic models with security and incentive alignment
- Leads cross-chain architecture decisions: bridge security, message passing, state sync
Typical Responsibilities
- Protocol architecture from concept to mainnet deployment and post-launch monitoring
- Security audit ownership - pre-launch internal review and remediation
- Technical leadership for on-chain engineering teams across multiple chains
- Tokenization and CBDC compliance architecture for regulated financial products
Not Suited For
Routine ERC-20 token work, frontend-only Web3 integration, basic contract deployment
Not sure which seniority level you need? Post your brief and our team will recommend the right tier based on your protocol complexity, security requirements, and timeline.
Blockchain Developer Rates by Region & Seniority
Transparent market benchmarks for Solidity, Rust, and multi-chain engineers. Open IT Freelancers adds a flat 15% management fee on top of the developer rate - no hidden costs.
Eastern Europe
Poland, Ukraine, Romania, Serbia
South Asia
India, Pakistan, Sri Lanka
South-East Asia
Philippines, Vietnam, Indonesia
Latin America
Brazil, Argentina, Colombia, Mexico
Middle East & Africa
Egypt, Nigeria, Kenya, UAE
Western Europe
UK, Germany, Netherlands, France
$0
Matching Fee
Post your brief and receive 3 shortlisted blockchain engineers at zero cost
+15%
Flat Management Fee
Applied on developer rate only. No per-milestone fees, no exit charges
14-day
Free Replacement
If the engineer is not the right fit in the first 14 days, we replace at no extra cost
All rates in USD. Blockchain developer rates carry a 15-25% premium over equivalent generalist seniority due to security criticality. Smart contract audit engineers command the highest rates regardless of region. Actual rate depends on seniority, chain specialisation, and engagement length.
Why Not Just Use Upwork or Web3 Job Boards?
For most developer categories, job boards are fine. For blockchain, the CV fraud rate makes unvetted hiring a genuine project risk.
✓
90-min live screen, chain-specific
✗
Profile reviews only
~
Technical screen, not chain-specific
✗
No structured vetting
✓
Primary focus - live screens catch fakes
✗
Self-reported skills, review ratings only
~
General coding screen, not Web3-specific
✗
Self-submitted resumes, no verification
✓
Ethereum · Solana · Polygon · Bitcoin L2
✗
Keyword search only
✗
Generalist engineering focus
~
Job listings only, no matching
✓
Weekly reports, audit milestones, IP protection
~
Platform escrow only
~
Account management tier, extra cost
✗
Direct hire - no management
15%
Flat on hourly rate, no placement fee
20%
Platform fee on all payments
20-40%
Placement + management markup
$0
Free to list, but no vetting
72 hrs
Vetted, matched profiles
Self-service
Manual search - days to weeks
3-5 days
After brief review
Weeks
Inbound applicants, no curation
✓
Guaranteed
✗
Dispute process only
✓
Trial period offered
✗
Direct hire, no recourse
✓
Tri-party contract, full IP transfer
~
Contract-dependent
✓
Standard in contracts
~
Depends on employment agreement
Examples of Briefs We've Filled.
The right blockchain brief is specific about chain, domain, security requirements, and timeline. Here is what strong briefs look like.
DeFi Yield Aggregator
Senior DeFi engineer with AMM and yield aggregation experience. Must have Foundry fuzz testing and pre-launch audit methodology.
Real Estate Security Tokens
Mid-level ERC-3643/1400 specialist for regulated asset tokenization. Compliance hook architecture and transfer restriction logic required.
On-Chain Game Logic
Mid-level engineer with ERC-6551 token-bound accounts experience for on-chain character state and verifiable randomness for loot drops.
Permissioned Payments Pilot
Senior blockchain engineer with experience on permissioned EVM networks, KYC-gated token transfers, and OFAC screening integrations.
Ready to post your brief? It takes 5 minutes and costs nothing to start.
Common Questions on Hiring Blockchain Developers.
The questions clients ask before their first blockchain hire - answered directly, without the recruiting brochure language.
Get 3 Vetted Blockchain Engineers in 72 Hours.
Post your brief in 5 minutes. We handle the live Solidity and Rust coding screens, on-chain verification, chain matching, and managed delivery. You get engineers who have shipped real mainnet contracts.
- 3 vetted blockchain engineers shortlisted in 72 business hours
- Every engineer passes a live 90-min Solidity or Rust coding screen - not a quiz
- On-chain verification of all cited contract/program deployments
- Flat 15% fee - no placement fees, no hidden markup
- Managed delivery: weekly reports, audit milestones, IP protection
- 14-day free replacement if not the right fit
- 100% ownership of all smart contract code and deployment keys
- 14-day notice to end - no exit penalties
No commitment · 72 hrs · $0 to start
Before You Hire
Free Developer Hiring Guides
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