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.
- Robust 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

📌 Java Developer – E-Invoicing Integration (India)
🏢 SRQ Companies
📍 India