Senior Backend Engineer

3 semanas atrás


Lisboa, Lisboa, Portugal Blocklabs Tempo inteiro

?Title : Senior Backend Engineer (Web3) Department : Engineering Location : UK or Europe, Remote About Block Labs Block Labs is a leading force in the Web3 space, incubating, investing in, and accelerating top-tier fintech, crypto and iGaming projects.
With a mission to shape the future of decentralized technology, we partner with visionary startups to raise funding, refine product-market fit, and grow their audiences.
Our diverse team drives innovation, using deep industry expertise and an extensive network to empower the next wave of blockchain-driven companies.
At Block Labs, we're passionate about turning bold ideas into breakthrough success.
About The Role As a  Senior Backend Engineer, you will be responsible for designing and building  scalable, high-performance backend services  for blockchain-integrated applications.
You will work closely with  engineering and product teams  to develop APIs and infrastructure that power Web3 experiences, ensuring  security, reliability, and efficiency .
Key Responsibilities: Develop and maintain backend services using NestJS (Node.js, TypeScript).
Design and implement secure, scalable APIs for Web3 applications, integrating with wallets, blockchain nodes, and smart contracts.
Work with ethers.js, web3.js, or viem to interact with blockchain networks (Ethereum, Polygon, Solana, etc.).
Implement authentication mechanisms.
Optimize database queries and caching strategies for high-throughput systems.
Collaborate with frontend and blockchain teams to ensure seamless integration of Web3 functionalities.
Build and maintain event-driven architectures for transaction processing.
Implement security best practices, including encryption, access control, and smart contract interactions.
Write clean, maintainable, and testable code while contributing to technical documentation.
Support the evolution of API standards and developer experience in the Web3 space.
About You: 4+ years of backend development experience with Node.js and TypeScript.
2+ years working with NestJS or similar frameworks.
Experience designing and maintaining APIs optimized for mobile applications.
Strong understanding of blockchain fundamentals and experience integrating with EVM-compatible chains.
Strong understanding of account abstraction and smart contract wallets (e.g., Safe, EIP-4337).
Experience with DevOps tools and cloud providers (AWS/GCP/Azure, Docker, Kubernetes).
Knowledge of authentication best practices and Web3 identity solutions.
Strong problem-solving skills and ability to work autonomously in a remote-first environment.



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