Mastercard SSE Interview Experience, I recently went through the interview process for a Senior Software Engineer (SSE) JAVA role at Mastercard. Overall, the experience was well-structured and focused on evaluating both technical depth and problem-solving abilities. Feedback assumed from my interview experience and Finally translated to offer. Always analyse your interview experience, What went well and what not. Round 1: Technical (Resume + Core Java) Discussion around past projects and hands-on experience Core Java concepts, including Java 8 and Java 21 features Stream API coding and conceptual questions Authentication concepts: SSO, SAML, OIDC, OAuth 2.0 Feedback: Strong positive The discussion was smooth and mainly focused on real-world experience and fundamentals. Round 2: Bar Raiser Scenario-based design questions Design patterns and practical use cases SOLID principles REST architecture fundamentals Debugging and bug-handling approach Feedback: Strong positive This round tested problem-solving skills and clarity of concepts rather than memorization. Round 3: Technical SME REST principles and API design 12 Factor App methodology SSO concepts, including SCIM AWS Lambda basics Spring Boot Security Java 8 and Java 17 features Differences between SAML, OIDC, and OAuth 2.0 Stream API usage API Gateway concepts Behavioral and pressure-based questions Feedback: Neutral positive Good focus on fundamentals. Feedback was to be more direct and concise in answers. Round 4: Managerial STAR-based behavioural questions Project experience deep dive Some technical discussion around API Gateway Feedback: Positive Round 5: HR Salary negotiation and general HR discussion Overall Experience Interview process was comprehensive and concept-driven Strong emphasis on fundamentals and real-world application Communication clarity plays an important role Final Verdict: Positive experience 👍