ZENITH INFOTECH (S) PTE LTD. is hiring for a Backend Developer (Java) - Contract internship — a 12-month, on-site Software Engineering role based in Singapore. It is an unpaid internship. It is open to university students, typically in Year 2–4. Applicants with experience in Code Quality, Design, Troubleshooting, JSP, and Root Cause Analysis are a strong fit.
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About this role
Role Overview We are seeking a highly analytical and proactive Java Backend Developer to take ownership of our client’s core server-side applications. This role is a blend of high-stakes problem-solving and strategic feature development. You will be the primary point of contact for diagnosing complex production issues while simultaneously driving the implementation of high-priority change requests to evolve our platform. Key Responsibilities 1. Advanced Troubleshooting • Lead the investigation and resolution of complex technical issues and performance bottlenecks reported by stakeholders or monitoring systems. Feature Evolution • Design, develop, and deploy new change requests (CRs), ensuring that new features integrate seamlessly with existing architecture. • Guarantee that new implementations do not introduce regressions into existing workflows. 2. System Maintenance • Perform root cause analysis (RCA) for recurring incidents and implement long-term structural fixes rather than temporary “band-aid” patches. Code Quality & Mentorship • Conduct thorough code reviews and provide technical guidance to junior developers. • Champion best practices in Java development across the engineering team. 3. Legacy Modernization • Identify opportunities to refactor and modernize older codebases to improve maintainability, scalability, and security. 4. Collaboration • Work closely with QA, Product Managers, and Frontend teams to validate requirements and ensure end-to-end functionality. Required Qualifications • Minimum 2–3 years of professional experience in Java backend development. • Strong proficiency in Java (Spring Boot, Spring MVC, Hibernate / JPA). • Solid experience with relational databases and SQL (MySQL, PostgreSQL, or Oracle). • Practical experience with ReactJS and/or NodeJS for frontend/full-stack integration. • Experience with RESTful API design, implementation, and integration. • Ability to conduct root cause analysis and deliver durable solutions for complex production issues. • Familiarity with version control systems (Git) and CI/CD pipelines. • Excellent problem-solving skills with the ability to work independently under pressure.
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