Senior Software Engineer - Java API developer

About the Role

We are seeking a highly skilled Senior Java API developer with experience in building high-performing, scalable, enterprise-grade backend systems in the digital advertising domain.
In this role, you will design, develop, and optimize backend services powering Mobile Ad SDK systems and AI-driven products such as recommendation engines, monetization optimization platforms, and intelligent ad delivery systems. This role will be responsible for productionizing machine learning models, building high-performance APIs, and enabling intelligent decision systems at scale

What You'll Do:

• Design and develop scalable, secure, and high-performance RESTful APIs using Java (Java 11+) and Spring Boot.
• Own end-to-end solution design, planning, execution, and release of backend features.
• Build and maintain backend services supporting AI-driven initiatives (recommendation systems, predictive analytics).
• Productionize and integrate ML models into backend systems, enabling real-time intelligent decisioning.
• Develop efficient data models and optimize database queries (MySQL/PostgreSQL) for performance and reliability.
• Ensure API security using OAuth2, JWT, and role-based access controls.
• Build for scale—design systems capable of handling high concurrency, large data volumes, and low-latency requirements.
• Implement observability best practices including logging, monitoring, tracing, and alerting.
• Participate in code reviews, design discussions, and technical decision-making to ensure engineering excellence.
• Collaborate cross-functionally with Analytics, Product, SDK, UI, Ad server, DevOps, and QA teams to deliver AI-powered features.
• Leverage generative AI tools and advanced prompt engineering techniques to enhance productivity and code quality.

We’d Love for You to Have

• 3–6 years of experience in Java development in Linux/UNIX environments.
• Strong proficiency in Core Java, OOPS, Data Structures, and J2EE technologies.
• Hands-on experience with Spring, Spring Boot, and Hibernate.
• Strong experience in REST Web Services development and microservices architecture.
• Proficiency in SQL, schema design, indexing, performance tuning, and complex queries.
• Experience with Docker, Kubernetes, Jenkins, Maven, Git, and CI/CD pipelines.
• Experience working on high-performance and scalable AdTech systems (preferred).
• Working knowledge of Python and integration with AI/ML services.
• Understanding of advanced AI concepts including RAG, agentic AI, model fine-tuning, and recommendation systems.
• Experience in JUnit, TDD, refactoring, and Agile development practices.
• Demonstrated ability to work independently and drive technical ownership.

Qualification:

Should have a bachelor’s degree in engineering or an equivalent degree from a well-known institute/university.

Additional Information:

Return to Office: PubMatic employees throughout the globe have returned to our offices via a hybrid work schedule (3 days “in office” and 2 days “working remotely”) that is intended to maximize collaboration, innovation, and productivity among teams and across functions.

Benefits: Our benefits package includes the best of what leading organizations provide, such as paternity/maternity leave, healthcare insurance, broadband reimbursement. As well, when we’re back in the office, we all benefit from a kitchen loaded with healthy snacks and drinks and catered lunches and much more!.