Web3 Full-Stack Software Engineer (m/f/n)

Currently, for one of our Partners, we are looking for an experienced Web3 Full-Stack Software Engineer (m/f/n) to support an EU Verify / Web3 project delivered for a European institutional environment.

Requirements

• Full-stack software development within the JavaScript/TypeScript ecosystem: at least 10 years.

• Web3 and blockchain solutions, including smart contract-based applications on EVM-compatible networks: at least 5 years.

• Decentralised identity and verifiable credential solutions, including digital wallets based on W3C standards: at least 5 years.

• Designing, building and securing RESTful APIs and web services: at least 5 years.

• IT project delivery within the public sector or European institutional environment: at least 5 years.

• Agile/Scrum delivery in complex, multi-stakeholder projects: at least 5 years.

• JavaScript and TypeScript, including modern ECMAScript standards, type systems and asynchronous programming: at least 5 years.

• Node.js and familiarity with Bun runtimes: at least 5 years.

• NestJS for modular applications and microservices: at least 5 years.

• RESTful APIs, OpenAPI specification and contract-first API design: at least 5 years.

• XML, JSON, JSON Schema and JSON-LD: at least 5 years.

• Web and API security standards: HTTPS, TLS, OAuth 2.0, OpenID Connect, mTLS and JWT: at least 5 years.

• React, including hooks, context and state management libraries: at least 5 years.

• Next.js for server-side rendering and full-stack React applications: at least 5 years.

• React Native for cross-platform mobile applications: at least 5 years.

• HTML5, CSS3, responsive and adaptive design: at least 5 years.

• Webpack and Vite: at least 5 years.

• PostgreSQL and MySQL, including schema design, indexing, query optimisation and complex SQL: at least 5 years.

• MongoDB, including document modelling and query optimisation: at least 5 years.

• Solidity smart contract development for EVM-compatible networks: at least 5 years.

• Smart contract upgradeability patterns, including Contract Factory, Beacon Proxy, UUPS, Transparent Proxy and EIP-2535 Diamond: at least 5 years.

• Ethereum standards and specifications: ERC-20, ERC-721, ERC-1155, ERC-1167, EIP-712 and EIP-1559: at least 5 years.

• Hardhat, Foundry and OpenZeppelin libraries/frameworks: at least 5 years.

• Smart contract interaction libraries, including ethers.js and viem: at least 5 years.

• Hardware wallets, ECDSA cryptography, key management and EIP-712 signing mechanisms: at least 5 years.

• Blockchain indexing and integration technologies, including SubGraph and GraphQL: at least 5 years.

• DID standards and frameworks, including DID resolution, DID documents and DID-based authentication: at least 5 years.

• W3C Verifiable Credentials Data Model, including issuance, revocation and verification flows: at least 5 years.

• Digital wallet integration and credential exchange protocols: OpenID4VCI, OpenID4VP and SIOP v2: at least 5 years.

• Docker and Kubernetes: at least 5 years.

• CI/CD tools and practices, including GitLab CI, Jenkins, ArgoCD and infrastructure-as-code concepts: at least 5 years.

• Git, JIRA and Confluence: at least 5 years.

• SonarQube, code review practices and technical debt management: at least 5 years.

• Full software development lifecycle management, from requirements analysis to production operations: at least 5 years.

• Experience in technical experimentation, benchmarking and comparative evaluation of Web3 architectures, protocols and implementation strategies.

• Experience designing and developing scalable web and mobile applications, including dApps.

• Experience implementing smart contract interactions and verifiable credential issuance/verification workflows.

• Experience writing and maintaining technical documentation, including API documentation, architecture decision records and developer guides.

• Author or co-author of at least 2 publications in a peer-reviewed magazine in the field of IT, electronics or mathematics.

• Education: EQF7 in Computer Science, Software Engineering, Electronics, Mathematics or Physics.

• English: minimum B2 level, with strong written and oral communication skills.

Nice to have

• PhD in IT, Engineering, Mathematics or Physics.

• Applied research experience related to Web3, decentralised identity, cryptography or distributed systems.

• Experience collaborating with architects, researchers and standardisation experts.

• Experience with research and publication of innovation issues related to IT and electronics.

Offer

• Contract: B2B via SHIMI Poland.

• Type of work: mostly remote / far-site work. Services must be performed from within the EU.

• Location requirements: occasional on-site presence in Brussels may be required with 7 days’ notice.

• Travel: occasional travel to Brussels may be required. Planned meetings are at the contractor’s cost, unless additional travel is explicitly requested and approved by the customer.

• Rate: 450–540 EUR/MD.