1st tech round. No defined scope of interview. A lot of jargon based question on git, java. Gave few scenarios for version control problems and wanted git commands to solve that scenario
I applied through college or university. I interviewed at Perfios Software (Koramangala)
Interview
Practice reading and changing existing code (not just writing from scratch).
Refactor small Node/Express modules to be more testable; write unit tests (Jest) and small integration tests.
Fix/extend React components for performance, accessibility, and maintainability; add unit tests (React Testing Library).
MongoDB/Schema changes — write migration-safe updates and tests for queries (edge cases).
Be comfortable explaining trade-offs (why a refactor helps, cost of change, backward compatibility).
Prepare common MERN pitfalls: callback/Promise leaks, request-timeouts, memory leaks in Node, N+1 DB queries, unhandled rejections, React re-render causes.
(General MERN interview topics and best practices can be reviewed in MERN preparation guides).
