BitGo coding interview
questions, leaked.
10 problems reported across recent BitGo interviews. Top patterns: array, hash table, string. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
BitGo interviews hit hard on arrays and hash tables, and they're not soft. Out of 10 problems in their typical rotation, 7 are medium or hard, with zero gimmes at the easy level. Arrays show up 5 times alone, hash tables 3 times, strings another 3. You're looking at design problems like LRU Cache, graph traversals like Number of Islands, and string DP puzzles like the encoded-string problem. The assessment will test your ability to spot patterns fast and code clean under pressure. If you blank mid-interview, StealthCoder surfaces a working solution invisibly while the proctor watches your screen.
Top problems at BitGo
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Check if an Original String Exists Given Two Encoded Strings | HARD | 100.0 | 43% | String · Dynamic Programming |
| 02 | Gas Station | MEDIUM | 88.6 | 46% | Array · Greedy |
| 03 | Number of Islands | MEDIUM | 79.6 | 62% | Array · Depth-First Search · Breadth-First Search |
| 04 | LRU Cache | MEDIUM | 73.2 | 45% | Hash Table · Linked List · Design |
| 05 | Bus Routes | HARD | 73.2 | 47% | Array · Hash Table · Breadth-First Search |
| 06 | Zigzag Conversion | MEDIUM | 73.2 | 52% | String |
| 07 | Longest Substring with At Most K Distinct Characters | MEDIUM | 73.2 | 49% | Hash Table · String · Sliding Window |
| 08 | Lowest Common Ancestor of a Binary Tree | MEDIUM | 64.1 | 67% | Tree · Depth-First Search · Binary Tree |
| 09 | Trapping Rain Water | HARD | 64.1 | 65% | Array · Two Pointers · Dynamic Programming |
| 10 | Game of Life | MEDIUM | 64.1 | 71% | Array · Matrix · Simulation |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual BitGo OA. The proctor cannot see it. Screen share cannot detect it. Made for the engineer who has done the work but might still blank with a webcam pointed at him.
Get StealthCoder- array5 · 50%
- hash table3 · 30%
- string3 · 30%
- depth first search2 · 20%
- breadth first search2 · 20%
- matrix2 · 20%
- dynamic programming2 · 20%
- tree1 · 10%
- binary tree1 · 10%
- linked list1 · 10%
Array problems dominate BitGo's interviews, so that's your drill priority. Greedy (Gas Station), matrix simulation (Game of Life), and two-pointer logic (Trapping Rain Water) are bread-and-butter here. Hash-table skills matter just as much, especially when combined with other patterns: LRU Cache layers in design, Bus Routes pairs hash tables with BFS, Longest Substring uses sliding window. Don't sleep on strings, depth-first search, and breadth-first search, each appearing in 2 to 3 problems. The medium-to-hard split (7:3) means you won't see many easy wins, so your edge is recognizing which pattern applies before you code. When you hit a wall on a tricky medium in the live OA, StealthCoder is your safety net.
Companies with similar patterns
If you prepped for BitGo, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass BitGo.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Made for the engineer who has done the work but might still blank with a webcam pointed at him. Works on HackerRank, CodeSignal, CoderPad, and Karat.
BitGo interview FAQ
How many array problems should I solve before the BitGo interview?+
Array problems appear in half the question bank (5 out of 10), and they're not all straightforward. Master Gas Station, Trapping Rain Water, and Game of Life first. Drill at least 8 to 10 more array problems from LeetCode hard/medium to build pattern recognition. Array skills are your foundation here.
Is hash table knowledge essential for BitGo's coding round?+
Yes. Hash tables appear in 3 of their 10 problems, and often paired with other patterns: LRU Cache adds design, Bus Routes adds BFS, Longest Substring adds sliding window. Understand hash tables deeply, not just as a lookup. You'll need to combine them with adjacent data structures.
What should I practice first: graph problems or string problems?+
Start with arrays and hash tables (8 problems combined). Then hit strings and graph traversal equally: each appears 2 to 3 times. The encoded-string problem and Number of Islands are both medium-to-hard, so don't treat them lightly. Strings come second; graphs third.
Are there easy problems in BitGo's interview, or should I expect all medium and hard?+
BitGo's real distribution is 0 easy, 7 medium, 3 hard. Expect to be uncomfortable the whole time. Your prep should focus on medium and hard problems exclusively. Don't waste time on easy-difficulty problems; they won't reflect the actual interview difficulty.
Will I need to design a system like LRU Cache during the BitGo interview?+
Possibly. LRU Cache is one of 10 problems in their pool, so design questions are part of the test. Understand hash tables plus doubly-linked lists, not just the concept. You need to code it cleanly from scratch.