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About the Role
We are looking for a Senior Backend Developer to join an exciting IoT-based project, building scalable, secure server-side solutions from the ground up.
Responsibilities
- Develop back-end website applications
- Integrate front-end elements with server-side logic
- Implement core business logic
- Design and implement data storage solutions
- Apply data & security best practices — input validation, auth, secure storage, compliant logging
- Optimize applications for speed and scalability
- Design and develop APIs
- Participate in scalable software architecture design
- Maintain code integrity and organization
- Write clean, functional backend code
- Compile & analyse data to troubleshoot issues and improve performance
- Perform unit/integration testing, debugging, and validation
- Deliver solutions aligned with functional & non-functional requirements
- Write technical documentation
- Configure cloud services for backend functionality (serverless, storage, Kubernetes)
- Implement authentication & authorization mechanisms
- Maintain unit/integration tests within CI/CD pipelines
- Manage project scope, schedule, budget, risks & stakeholders
Requirements
- 5+ years in software engineering (full-stack, backend, frontend, distributed systems)
- 5+ years designing scalable, secure, maintainable cloud architectures
- 5+ years delivering software in Agile/Scrum environments
- 3+ years with Decentralised Identity (DID) & W3C Verifiable Credentials
- 3+ years implementing OpenID4VCI and OpenID4VP
- 3+ years with secure credential issuance, verification & digital wallet integration
- 3+ years with cryptographic workflows, digital signatures & key management
- 3+ years developing blockchain-based/distributed-ledger solutions
- 3+ years performing code reviews & software engineering best practices
- 3+ years with Digital Product Passport solutions
- 10+ years backend programming (Go, C++) & server-side frameworks (Node.js)
- 10+ years with APM tools (Dynatrace, Splunk, Elastic APM) + OpenTelemetry
- 7+ years with relational (PostgreSQL, Oracle, MySQL) & NoSQL (MongoDB, CouchDB, CosmosDB) databases
- 7+ years with version control workflows (GitFlow, trunk-based, SVN)
- 7+ years designing/securing RESTful APIs (OpenAPI/Swagger)
- 7+ years with containerisation & orchestration (Docker, Kubernetes)
- 4+ years with OAuth 2.0, OpenID Connect, W3C VCDM, DIDs, SD-JWT
- 2+ years defining digital signature standards
- 5+ years with blockchain/DLT integrations, smart contracts, event-driven architecture
- 3+ years with Ethers.js and Web3 integrations (wallet connectivity, transaction signing)
- 1+ year with Zero-Knowledge Proofs (ZKP) for privacy-preserving proofs
Skills
- Decentralised Identity (DID)
- W3C Verifiable Credentials
- OpenID4VCI
- OpenID4VP
- Cryptographic workflows
- Digital signatures
- Key management
- Blockchain
- Distributed ledger solutions
- Digital Product Passport
- Go
- C++
- Node.js
- APM tools
- Dynatrace
- Splunk
- Elastic APM
- OpenTelemetry
- PostgreSQL
- Oracle
- MySQL
- MongoDB
- CouchDB
- CosmosDB
- GitFlow
- Trunk-based development
- SVN
- RESTful APIs
- OpenAPI
- Swagger
- Docker
- Kubernetes
- OAuth 2.0
- OpenID Connect
- W3C VCDM
- DIDs
- SD-JWT
- Digital signature standards
- Smart contracts
- Event-driven architecture
- Ethers.js
- Web3 integrations
- Zero-Knowledge Proofs (ZKP)
Location
- Remote (EU region)
- Belgium (occasional travel)
Work Type
- Remote
- Full-time
Experience Level
- Senior
- 5+ years software engineering
- 5+ years cloud architecture
- 5+ years Agile/Scrum
- 3+ years Decentralised Identity
- 3+ years OpenID4VCI/VP
- 3+ years credential issuance/verification/wallet integration
- 3+ years cryptographic workflows/digital signatures/key management
- 3+ years blockchain/DLT development
- 3+ years code reviews/best practices
- 3+ years Digital Product Passport
- 10+ years backend programming
- 10+ years APM tools/OpenTelemetry
- 7+ years databases
- 7+ years version control
- 7+ years API design/security
- 7+ years containerisation/orchestration
- 4+ years OAuth/OpenID Connect/W3C VCDM/DIDs/SD-JWT
- 2+ years digital signature standards
- 5+ years blockchain/DLT integrations/smart contracts/event-driven architecture
- 3+ years Ethers.js/Web3 integrations
- 1+ year Zero-Knowledge Proofs
About the Company
- Partnering with a leading company on a cutting-edge IoT project.