BitGo Interview Experience – Backend Engineer E3 (Rejected)

My interview process for the Backend Engineer E3 role at BitGo began with recruiter outreach through Instahyre.

Round 1: Online Assessment (Coderbyte)
This was an online assessment administered via Coderbyte. Honestly, I don't recall the specific questions from this round.

Round 2: DSA Pair Programming (Coderbyte)
This round involved live coding and discussions on two data structures and algorithms problems:
1. A BFS problem on a grid, which was quite similar to the classic Rotting Oranges problem.
2. Finding the longest path in a general graph. This problem was conceptually similar to LeetCode's Binary Tree Maximum Path Sum, but adapted for a graph structure, and I was also required to print the actual path.

Round 3: Machine Coding (LLD)
The task here was to implement the stoi (string to integer conversion) function. While it seemed like a DSA problem, I approached it with a strong focus on low-level design principles. I ensured I followed proper Object-Oriented Design (OOD), covered all relevant edge cases clearly, and completed the implementation in approximately 35 minutes. To demonstrate extensibility, I even incorporated a Strategy Pattern, which would allow for future parsing rules. The interviewer mentioned that all requirements were fulfilled and the round concluded early.

Final Outcome
Despite what seemed like a positive outcome in the LLD round, I was ultimately rejected. No detailed feedback was provided regarding the rejection.