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Senior Backend / API Developer (Web3)

Barcelona💼 Full-time🗓 2026-03-09 → 2026-09-23

Core

Designing and implementing scalable backend services and APIs for Web3 solutions focused on verifying provenance, traceability, and digital integrity in AI transactional environments.

Role type

Senior Backend / API Developer (Web3)

Builds

Backend services and APIs for DLT/Web3 applications

Domain

Web3, Distributed Ledger Technology (DLT), AI transactional environments

Deliverable

production ML models | product features

Required skills

Node.js, Python, Go, Java, RESTful APIs, GraphQL, SQL, NoSQL, Blockchain/DLT principles, DID, verifiable credentials

Preferred skills

ethers.js, web3.js, Docker, Kubernetes, automated testing, CI/CD, governance and compliance

Technologies

Node.js, Python, Go, Java, RESTful APIs, GraphQL, SQL, NoSQL, IPFS, Filecoin, ethers.js, web3.js, Docker, Kubernetes

Responsibilities

Design and develop scalable backend architectures for Web3 applications; Implement and manage RESTful and GraphQL APIs for DLT and dApp integration; Integrate third-party services like oracles and decentralized storage; Optimize backend performance and security; Define strategies for data management, integrity, and privacy.

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