Blockchain Web3 Developer
Belmont LavanNetherlands11 hours ago
ContractInformation Technology
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We are seeking an experienced Blockchain / Web3 Developer who will design, build, test and deploy smart contracts, integrate them with front-end and back-end systems, and ensure high standards of security, performance, and usability. You will collaborate with product, UX, frontend, and backend teams to deliver production-ready features, contribute to architecture decisions, and continuously improve our Web3 stack.
Key Responsibilities
Key Responsibilities
- Design, write, and deploy secure smart contracts
- Implement token standards (ERC-20, ERC-721, ERC-1155) and upgradeable contracts using libraries like OpenZeppelin
- Optimise contracts for gas usage, performance, and security, including audits and peer reviews
- Integrate Web3 libraries with front-end applications and wallets
- Develop backend services / APIs that interact with on-chain and off-chain data.
- Work with Layer 2 / roll-ups / scaling solutions, bridges, and/or cross-chain integrations where required
- Write automated tests, maintain CI/CD pipelines, and ensure robust coverage and code quality
- Maintain clear technical documentation, and mentor more junior engineers
- 5 - 8+ years experience in blockchain / Web3 development
- Strong Solidity skills; experience with EVM chains; familiarity with non-EVM is desirable
- Proficiency in Web3 tools: Hardhat, Truffle, Foundry, etc.
- Experience with front-end technologies (React, Next.js )and backend
- Good grasp of REST / GraphQL APIs, database work (SQL / NoSQL), and decentralised storage
- Solid understanding of Web3 security best practices
- Ability to work in an agile, collaborative team; good communication skills in English
- Experience with gas-efficient contract design and Layer-2 roll-ups
- Prior exposure to zero-knowledge proofs, account abstraction, or decentralised identity (DID) systems
- Open source contributions or code samples / portfolio of deployed smart contracts or projects
- Experience in marketplace / escrow / auction mechanics
Key Skills
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