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

SHIMI Sp. z o.o.

• 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.
• 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: 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.

Services must be performed from within the EU. Occasional on-site presence in Brussels may be required with 7 days’ notice. Planned meetings are at the contractor’s cost, unless explicitly requested and approved by the customer.