Senior C++ Software Engineer
Posted Sep 24, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a time you worked closely with traders to build something they needed.
What they are checking: Whether they can translate trading needs into software and collaborate across the business.
How do you mentor less experienced engineers on performance-critical code?
What they are checking: Whether they raise the team's skill level through review and teaching, as expected of a senior engineer.
Tell me about the hardest performance problem you have solved.
What they are checking: Whether they have real depth in diagnosing and fixing difficult problems, not just textbook knowledge.
What would you do
A change you shipped causes unexpected behavior in production during market hours. What do you do?
What they are checking: Whether they act quickly to limit trading risk, communicate with traders and investigate calmly.
About the work
How would you design a low-latency order gateway in C++? Walk me through the main components.
What they are checking: Whether they can design for predictable latency with careful threading, memory and network choices.
What techniques do you use to avoid allocations and cache misses on the hot path?
What they are checking: Whether they understand memory layout, object pools and data structures that keep latency low and predictable.
How do you measure latency in a trading system, and how do you find the cause of a spike?
What they are checking: Whether they use precise timestamping and profiling instead of guessing at performance problems.
Explain how you would write a lock-free queue between a market data thread and a strategy thread.
What they are checking: Whether they understand memory ordering and atomics well enough to avoid subtle concurrency bugs.
Which modern C++ features do you use in performance-critical code, and which do you avoid?
What they are checking: Whether they make deliberate language choices based on cost rather than style preferences.
How do you test trading software so bugs do not reach production?
What they are checking: Whether they use unit, replay and simulation testing appropriate to systems that move real money.
Practice this interview out loud.
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Practice this out loudThe full job description
As published by Belvedere Trading.