Back End Engineer

Key Responsibilities

• Design, develop, and maintain scalable backend services and REST APIs.
• Build and maintain backend applications using Node.js and preferably Java.
• Design efficient database structures, queries, and transactions using PostgreSQL.
• Develop integrations with internal and external systems and third-party APIs.
• Implement secure, reliable, and high-performance backend services.
• Work with asynchronous processing, queues, background jobs, and event-driven systems where required.
• Troubleshoot production issues and improve system performance and reliability.
• Write clean, maintainable, and well-tested code.
• Collaborate with frontend engineers, product teams, QA, and other stakeholders.
• Participate in code reviews, technical discussions, and architecture decisions.
• Contribute to system documentation and technical specifications.

Required Skills & Experience

• 4-6 years of professional software development experience.
• Strong experience with Node.js or Java.
• Good knowledge of PostgreSQL, including database design, SQL, indexing, and query optimization.
• Strong understanding of REST APIs, backend architecture, authentication, and integrations.
• Experience working with Git and standard software development practices.
• Good understanding of software development lifecycle, debugging, testing, and deployment.
• Ability to work independently and solve complex technical problems.

Preferred Skills

• Experience with Spring Boot.
• Experience building or integrating e-invoicing systems.
• Knowledge of Peppol network and e-invoicing standards.
• Experience with PINT, UBL, BIS Billing, AS4, SMP/SML, or similar standards and protocols.
• Experience developing or integrating SDKs.
• Experience with tax technology, fiscalization, or compliance platforms.
• Experience with Redis, message queues, background processing, or event-driven architectures.
• Experience with Docker, CI/CD, and cloud platforms.