### Senior Backend Developer (IoT / Digital Identity)

Now partnering with a leading company on a cutting-edge IoT project!

Remote --- anywhere in the EU region \| ✈️ Occasional travel to Belgium required \| Start: Mid-September \| ️ English

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Are you a seasoned backend engineer with deep expertise in decentralized identity, blockchain, and secure API design? We're 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

#### Must-Have (CV)

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

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**Ready to build the future of secure digital identity? Apply now!**

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