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Job description
Location: Navi Mumbai, India Department: Engineering
Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper.
As a Senior Software Engineer, you will be a key hands-on contributor responsible for designing, building, and operating secure, reliable backend services. You will work on complex engineering problems, contribute to system design decisions, and deliver high-quality solutions that operate at scale in production environments.
Responsibilities
Design, develop, test, and support scalable APIs and backend services
Contribute to system design decisions with a focus on scalability, resilience, and performance
Deliver high-quality, production-ready code across the full software development lifecycle
Troubleshoot and resolve production issues, ensuring system stability and reliability
Participate in code reviews and uphold engineering best practices and standards
This guide is for Indian job seekers preparing for Java backend roles, from freshers facing campus and first-job interviews to experienced developers moving into senior positions at product companies and IT services firms. It covers what interviewers ask most in 2025 and 2026 on Java 17 and 21 and Spring Boot 3: OOP, collections, equals and hashCode, streams, exceptions, concurrency and JVM memory, then dependency injection, auto-configuration, REST controllers, validation, JPA and Hibernate, security, microservices and testing. Questions are grouped as easy, medium and hard. Read each answer, compile the code yourself and practise explaining it aloud.
Questions you may be asked
What are the four pillars of OOP, with a Java example of each?
What is the difference between an abstract class and an interface in Java?
What is the difference between method overloading and method overriding?
What is the difference between == and equals() in Java?
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Senior Software Engineer – Integrations & API Connectivity
Navi Mumbai
1
Full time
3–5 years
₹10L – ₹25L a year (estimate, typical for IT Jobs in India, 827 posts)
