Senior Fullstack Developer, Web3 (Nestjs & React) Lisboa

Senior Fullstack Developer, Web3 (Nestjs & React)
Lisboa
Lisboa, Lisboa, Portugal

Location : UK or Europe, Remote

About Block Labs

Block Labs is a leading force in the Web3 space, incubating, investing in, and accelerating
- tier fintech, crypto, and i
Gaming projects. With a mission to shape the future of decentralized technology, we partner with visionary startups to raise funding, refine
- 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
- driven companies. At Block Labs, we’re passionate about turning bold ideas into breakthrough success.

About The Role

As a Senior Fullstack Engineer, you will design and develop scalable,
- performance applications that integrate blockchain technologies. You'll work across both frontend and backend, collaborating closely with engineering and product teams to build
-
- end Web3 experiences. Your focus will be on creating secure, seamless, and performant applications that interact with smart contracts, wallets, and decentralized protocols.

Key Responsibilities :

• Develop and maintain backend services using Nest
  JS (Node. Js, Type
  Script).
• Build responsive,
  - performance user interfaces using React and Type
  Script.
• Design and implement secure, scalable APIs for Web3 applications.
• Implement wallet interactions,
  - chain transactions, and
  - time updates in the frontend.
• Implement
  - party integrations for
  - ramps, swaps, and other blockchain services.
• Optimize database queries, caching strategies, and frontend rendering for performance and scalability.
• Build and maintain
  - driven architectures for blockchain transaction processing.
• Implement authentication and authorization mechanisms, including Web3 identity solutions.
• Ensure security best practices across the stack, including encryption, access control, and smart contract interactions.
• Collaborate with product, design, and engineering teams to ship
  - impact features.
• Write clean, maintainable, and testable code while contributing to documentation and code reviews.
• Help shape internal standards and developer experience in a
  - moving Web3 environment.

About You :

• 4+ years of backend development experience with Node. Js and Type
  Script.
• 2+ years working with Nest
  JS or similar frameworks.
• Experience designing and maintaining APIs optimized for mobile applications.
• Strong understanding of blockchain fundamentals and experience integrating with EVM-compatible chains.
• Experience with Dev
  Ops tools and cloud providers.
• Knowledge of authentication best practices and Web3 identity solutions.
• Strong
  - solving skills and ability to work autonomously in a
  - first environment.
• Experience with Fireblocks or similar MPC-based custody platforms is a plus.

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