Recently appeared for the Senior Software Engineer – Fullstack interview at Freshworks and wanted to share my experience. Hope this helps others preparing for the process.

Round 1: DSA + Resume Discussion

• Deep discussion on my current project, architecture, performance optimizations, and ownership.

• DSA questions were based on the Stock Span problem:

  • Stock Span I
  • Stock Span II
  • Stock Span III

Round 2: Frontend Round (JavaScript heavy)

This round was strongly focused on JavaScript fundamentals and browser internals.

Topics asked

• What are semantic HTML elements and why are they important?

• Performance comparison:

  • left: 200px
  • transform: translateX(200px)
  • Which is faster and why?

• Difference between async and defer in the <script> tag.

• Difference between Shadow DOM and Virtual DOM.

• Several in-depth JavaScript questions on execution model, closures, event loop, and rendering (don’t remember all of them).

• Design a tooltip using only HTML/CSS (constraint: no JavaScript).

• Implement flattening of a nested array and discuss extending it via Array prototype.

• Explain React Fiber and how React scheduling/reconciliation works.

After the second round, I also received a rejection message.

Overall Feedback

• Interviewers were friendly but expected strong conceptual understanding rather than memorized answers.
• The frontend round was significantly deeper than a typical React interview and focused heavily on JavaScript internals and browser performance.
• Be prepared to explain why something works, not just what it is.

For anyone preparing for Freshworks Fullstack roles, I’d recommend revising:
JavaScript internals, browser rendering pipeline, CSS performance, React Fiber, DOM APIs, and stack-based DSA problems.

Happy to answer questions if anyone is preparing for the same role.