Meta US SWE E4 rejection :( full loop breakdown
Rejected 😞 feel super upset, tried my best.
3 YOE at European bigtech. Tried asking what they didn't like — recruiter said they're not sharing feedback this time and I have to wait a year before reapplying. Brutal.
Preloop coding — passed strong 2 questions:
- LRU cache (classic)
- DFS on binary tree
Full loop coding — passed strong
- DFS on grid, find the actual path to bottom right (return the path, not just whether reachable)
- Nested list sum where each depth level multiplies by the numbers at that depth. This one is from the "Meta recently asked 50" list — if you haven't gone through those, go find them now
System design Ticketmaster "buy" button, but specifically the case of 20k Taylor Swift tickets dropping at once. Walked through queuing, rate limiting, optimistic locking vs distributed locks, eventual vs strong consistency for inventory. Interviewer said he enjoyed the round so I think this was solid.
AI coding — where I lost the loop Meta's newer format. 5 tests total, I passed 3.
Setup: grid problem again, navigate with < > directions and walls to reach the end, you write code with AI assistance.
Got stuck on the first error to fix for 30 minutes (omg). Found the right place to fix fast but couldn't get the exact correct fix, ended up finishing with AI help. Next 2 tests I did fast and solid but the damage on the timer was already done.
Behavioral Standard. No idea about results from this one.
What I think went wrong:
The AI coding round, specifically the 30-minute stuck moment. The whole format is timed across multiple tests so one long block destroys you. If I'd unstuck myself in 10 minutes I'd have hit 4/5 minimum and probably been in the offer range.
For anyone going into Meta E4 right now: the AI coding round is the differentiator. Coding fundamentals will get you through the other rounds clean but the AI coding is where E4 candidates actually get sorted.
What worked for prep:
- PracHub was easily the biggest single thing in my coding prep. I drilled DFS / BFS / tree traversal patterns there for about 4 weeks and by the loop, the grid DFS and the nested list problem felt like muscle memory — barely had to think about the recursion, just wrote it. Both coding rounds came back "passed strong" and honestly I don't think that happens without that pattern-level prep. The fact that I cleared 4 of 5 round types (preloop, loop coding, system design, behavioral) is mostly down to the foundation it built. If you're going into a Meta loop and have limited prep time, that's where I'd start.
- LeetCode for additional volume on the Meta-tagged questions — the "recently asked at Meta" list is genuinely useful, the nested list sum was on it
- HelloInterview for system design — gave me the mental template for read-heavy systems like the Ticketmaster question
- AI coding round — I had no good prep for this. If anyone has tips for this format, drop them in the comments. Would really appreciate it for the retry in a year
Did anyone else get an offer this round? They announced layoffs again so not sure if the bar has been pushed up or if hiring is just frozen for a lot of roles.