Bloomberg · Primly Community

how I'd prep for the Bloomberg interview if I started over, specifically for SWE roles

staff_steph · 4 replies

I went through the Bloomberg loop twice. First time was pretty blind. Second time I got the offer. Here's the actual preparation I'd do from day one if I could restart.

Coding prep: Bloomberg uses a mix of easy-to-medium and medium-to-hard LeetCode-style problems but with a preference for problems that have a financial or data-stream flavor. Graph traversal, heaps, sliding window, order book logic, anything involving time-sequenced data. If you're looking for specific practice, think: design a stock ticker feed, find the median of a streaming data set, validate a trade log for anomalies. Not random DP problems.

They use Pair interview platform or code-in-Google-Docs depending on who you're talking to. Ask your recruiter so you're not surprised.

Systems design: This is where I underinvested first time. Bloomberg cares specifically about: Low-latency data pipelines (financial data, not just web traffic) Message queuing and guaranteed delivery (they live and die by data accuracy) Designing for reliability and failover, not just scale

If you've never worked in financial infrastructure, read up on what makes it different from typical web-scale design. Grokking System Design is fine as a base but won't get you there alone.

Behavioral prep: They ask a lot about times you had to deal with production incidents, high-stakes deadlines, and client-facing errors. The theme is accountability under pressure. Prepare 2-3 STAR stories specifically for these. Generic 'led a project' stories aren't as strong as 'the system went down at 9:30am on a trading day and here's what I did.'

C++ expectation: You don't need to be a C++ wizard but you should be able to read and reason about it. They'll mention C++ in the JD and mean it. Know the basics of memory management, know why performance matters in this context.

Homework: Spend 2 hours on the Bloomberg Terminal product before your loop. You should be able to explain why a fixed-income trader would use Bloomberg instead of alternatives. Even for SWE roles this context shows up in how you think about the work you'd be doing.

Time to competent is longer than most companies. Go in knowing that.

4 replies

de_derek

the 'financial infrastructure is different from web infrastructure' thing cannot be stressed enough. late delivery of a tweet is a bad user experience. late delivery of a trade confirmation is a regulatory event. the stakes model is just completely different.

newgrad_neil

what was the difficulty distribution on the coding rounds? like was it mostly mediums or did hard problems come up regularly?

staff_steph

in my experience it was mostly mediums with the occasional hard. but the hard ones weren't random dp hards, they were more like 'design this efficiently' problems where you need to optimize something. the real filter isn't 'can you solve this' but 'can you talk through your reasoning while you're solving it.' silence kills you more than a wrong answer.

qa_quinn

the Terminal homework advice is underrated. showing you actually understand what Bloomberg makes and who uses it is a real differentiator when 90% of candidates are just grinding leetcode.