Harshavignesh (Harsha) Mathan is a Principal Data Engineer and IIT Kanpur alumnus, with deep experience building end-to-end data platforms on the cloud. Over the last decade, he has led and mentored data engineering teams, designed scalable data architectures, and driven migrations to modern stacks like Snowflake and AWS for analytics-heavy organizations. ​ His expertise spans data modeling, performance tuning, ELT/ETL pipelines, and integrating machine learning workflows into production data systems, with a strong focus on writing clean, reliable SQL/Python and building interview-ready projects. Having gone through multiple transitions himself, from hands-on engineer to tech lead and now principal-level roles—he understands the practical challenges of switching to data engineering, leveling up to senior roles, and preparing for tough FAANG-style interviews. ​ On this Topmate page, Harsha is starting, a focused initiative to help students and working professionals with: Career clarity in data engineering and applied AI Structured interview preparation (DSA for data engineers, SQL, system design, and scenario-based questions) Personalized resume/LinkedIn reviews and roadmap planning based on current skills and target roles. ​ Sessions are practical, candid, and tailored—expect clear action items, honest feedback, and a roadmap you can execute in 4–8 weeks rather than generic motivational talk.