Is a product company switch realistic after several years at TCS?
Yes, and the years are not the blocker. What blocks candidates is a resume written as delivery participation and a loop they have not prepared for. Once your profile leads with owned components and you have measured your data structures and system design baseline, the switch becomes an execution problem with a timeline. Across 14 verified switches the median hike recorded was 147 percent, ranging from 56 to 250 percent.
Will product companies reject me because I have only service-company experience?
Some screens will filter on it, which is why the resume has to answer the objection before a human reads it. Lead with systems, scale, failure modes and decisions you owned. Then apply through referrals, where a person reads the profile instead of a keyword filter. The objection is real, but it is answerable with evidence rather than with a longer explanation of your background.
How much preparation time should I plan before applying?
Plan a preparation window before applications, not during them. For most engineers that means six to ten weeks of consistent daily practice on data structures and weekly system design work, followed by a batched application phase. Applying first and preparing later spends your best-fit companies on your worst interviews, and most firms keep a six to twelve month gap before you can re-apply.
How does notice period affect a product company offer?
Indian notice periods of sixty to ninety days shape the entire timeline, so declare yours on the first recruiter call rather than at offer stage. Most product companies plan headcount around a start date, and a surprise ninety-day notice in the final round can lose you the slot. Ask about buyout policy early, and keep your resignation aligned to the written offer, never before it.