Web 3 Back-End Software Engineer

Currently, for one of our Partners, we are looking for an experienced Web3 Back-End Software Engineer (m/f/n).

Offer:

Contract: B2B via SHIMI.

Mostly remote, services must be performed from within the EU. Occasional travelling to Brussels may be required (the client may request on-site presence in Brussels with 7 days’, at contractor’s cost).

Rate: 450-540 EUR/MD netto+VAT

Requirements:

Education: diploma in IT, Engineering, Mathematics or Physics

• Software engineering, full-stack/backend/frontend/distributed systems: 5 years
• Scalable, secure, cloud-based software architecture: 5 yearsAgile / Scrum delivery: 5 yearsDID and W3C Verifiable Credential solutions: 3 yearsOpenID4VCI and OpenID4VP: 3 years
• Credential issuance, presentation, verification, wallet integration: 3 years
• Cryptographic workflows, digital signatures, secure key management: 3 years
• Blockchain-based and distributed-ledger solutions: 3 years
• Code reviews and software engineering best practices: 3 years
• Digital Product Passport solutions: 3 years
• Java
• Script, TypeScript, React, Next.js, React Native, HTML5, CSS3, Webpack, Vite: 5 yearsNode.js, NestJS: 5 years
• RES
• Tful APIs, OpenAPI, PostgreSQL, MySQL, MongoDB: 5 years
• Solidity, Hardhat, Foundry, Open
• Zeppelin, ethers.js, token standards: 3 yearsDID, VC, SD-JWT VC, OpenID4VCI, OpenID4VP, SIOP v2, OAuth2, OIDC: 3 yearsECDSA, hardware wallets, digital signatures: 3 yearsEBSI ecosystem: 3 yearsXML, XSD, JSON, JSON Schema, JSON-LD: 3 yearsWeb application security, API protection, OAuth, OWASP: 5 years
• Docker, Kubernetes, GitLab CI, Jenkins, ArgoCD, Git, AWS, Azure, DevSecOps, JIRA, Confluence: 5 years
• English B2 minimum
• Tasks
• Development of back-end website applications.

Integration of user-facing elements developed by a frontend developers with server-side logic.

Implement core business logic.

Design and implementation of data storage solutions.

Apply data and security best practices: input validation, authentication/authorisation, secure storage, compliant logging and monitoring.

Optimisation of the application for maximum speed and scalability.

Design and develop APIs.

Participate in the design and creation of scalable software.

Maintenance of code integrity and organisation.

Writing clean, functional code on the backend.

Compile and analyse data, processes, and code to troubleshoot problems and identify areas for improvement, including setting up and querying monitoring tools.

Perform unit/integration testing, debug, fix, and validate code changes.

Deliver solutions that fulfil functional and non-functional requirements and align with user expectations.

Write technical documentation.

Basic configuration of cloud services for back-end functionality (e.g., serverless functions, storage accounts, managed Kubernetes).

Develop and maintain services and business logic using one or more back-end programming languages.

Implement authentication and authorization mechanisms to secure API endpoints and services.

Write and maintain unit and integration tests to ensure code quality and reliability, integrating them into the CI/CD pipeline.

Plan, execute, and control projects by managing scope, schedule, budget, risks, and stakeholders with recognised methods.