Java Developer – E-Invoicing Integration

SRQ Companies is expanding its e-invoicing technology platform, with a focus on Peppol-based electronic invoicing and integration with ERP and accounting systems.

We are looking for a strong Java Backend Developer to join our technology team and take responsibility for the development and maintainance of the application.

The ideal candidate should have strong Java development experience and a good understanding of SOAP, XML, web services, digital certificates and security. Experience with Peppol, AS4, e-invoicing or eDelivery standards is highly desirable.

Key Responsibilities

• Develop and maintain Java-based components for Peppol AS4 messaging and e-invoicing.
• Integrate and customize established open-source AS4 implementations
• Work with Apache CXF, Apache WSS4J and XML Security where required.
• Implement and troubleshoot:
• AS4 messaging
• SOAP / SOAP with Attachments
• WS-Security
• XML Digital Signature
• XML Encryption
• RSA-OAEP and related cryptographic algorithms
• TLS and digital certificates
• AS4 receipts and acknowledgements
• Investigate interoperability issues between our AS4 implementation and Peppol Access Points / endpoints.
• Work with SMP/SML discovery, participant identifiers, service metadata and Peppol network requirements.
• Integrate the Java AS4 service with our existing PHP-based Muhasib platform through REST APIs.
• Develop reliable message handling including retries, error handling, logging, message tracking and duplicate detection.
• Work with XML-based invoice standards including UBL and Peppol BIS/PINT.
• Support integration testing with Peppol test environments and external Access Points.
• Analyse technical specifications and implement requirements from Peppol and relevant e-invoicing authorities.
• Maintain secure, scalable and production-ready backend services.
• Prepare technical documentation for the developed components.

Required Technical SkillsEssential

• 3+ years of professional Java development experience.
• Strong knowledge of Java 11+ / Java 17+.
• Strong experience with Spring Boot / REST APIs.
• Good understanding of SOAP and web services.
• Strong knowledge of XML, XML namespaces, XSD and XML processing.
• Experience with digital certificates, keystores, TLS and public-key cryptography.
• Experience troubleshooting complex integration and interoperability issues.
• Good understanding of HTTP, HTTPS and networking.
• Experience with Git and standard software development practices

Experience with one or more of:

• Peppol
• AS4 / ebMS3
• eDelivery
• OpenPeppol
• Apache WSS4J
• Apache CXF
• XML Digital Signature
• XML Encryption
• RSA-OAEP
• UBL / Peppol BIS / PINT
• E-invoicing platforms

Pay: ₹600,000.00 - ₹720,000.00 per year

Application Question(s):

• What is the Notice Period you have, if you are currently employed?

Education:

• Bachelor's (Preferred)

Experience:

• encryption, WS security & Cryptography: 1 year (Required)
• As4: 1 year (Required)
• ebms: 1 year (Required)
• Apache CXF: 1 year (Required)
• Apache WSS4J: 1 year (Required)
• Strong Java + SOAP/XML : 5 years (Required)

Work Location: Remote