Md Wahidul A.

I build the Java services behind verifiable credentials, decentralized identity, and cross-company data exchange — the infrastructure that lets organisations share data without giving up control of it. I'm a contributor to Eclipse Tractus-X IdentityHub, the DCP wallet and issuer service behind Catena-X identity, which I work on as part of my role at Technovative Solutions Ltd. My merged contributions repaired the credential issuance, presentation and revocation flow after a major EDC upgrade, fixed two long-standing Kubernetes deployment bugs in the Helm charts, and added the end-to-end CI test that now guards the flow on every pull request. I'm also a Catena-X Qualified Advisor, certified by the Catena-X Association after training and examination. How I can help: - Verifiable credentials & decentralized identity — DIDs, W3C verifiable credentials, issuance and presentation flows, status lists and revocation, DCP, wallet deployment and integration - Eclipse EDC, Catena-X & Tractus-X — connector and IdentityHub deployment, participant onboarding, policy and credential configuration, dataspace troubleshooting - Java & Spring Boot backends — REST APIs, microservices, PostgreSQL, Gradle, test automation, refactoring legacy services - Deployment & operations — Docker, Kubernetes, Helm, HashiCorp Vault, GitHub Actions, CI/CD Recent proof of work: I verified a full three-party dataspace end to end — credential issuance and presentation across two holder wallets and two EDC connectors, through catalog, contract negotiation, transfer and data pull — and built the automated test suite that keeps it working. Background: 16+ years of professional Java development, currently Senior Software Engineer at Technovative Solutions Ltd. Eclipse Foundation contributor with a signed Eclipse Contributor Agreement. If you're building on Catena-X, evaluating a credential-based identity approach, or need a Java developer who's shipped code into a production dataspace stack rather than just read the spec — send me a message describing the problem and I'll tell you honestly whether I'm the right fit.