For Candidates · Career Paths
What Does a Software and Systems Engineer Do in Trading, and How Do You Get In?
“Software engineer” covers a huge amount of ground at a trading firm, and the label alone doesn’t tell you much about what the actual work involves. Here’s what the field genuinely covers, and what it takes to get in.
What does software and systems engineering actually mean at a trading firm?
A much wider field than the title suggests. It spans core trading and execution systems, post-trade and risk technology, internal developer tooling, and market data infrastructure, each requiring meaningfully different skills even though they all sit under a broad “software engineer” label. Understanding which of these you’re actually interested in matters more than the job title itself.
What technical skills actually matter most?
Deep systems fundamentals, memory management, concurrency, and genuine performance-critical engineering ability, matter more than breadth across many languages or frameworks. Most top firms test for this directly, asking questions about how code actually behaves under real performance pressure, cache behaviour, thread contention, rather than abstract algorithm puzzles. Strong C++ ability remains the most common foundation, though the specific stack varies by firm and team.
Do I need financial markets experience to break into software and systems engineering?
No. Genuine systems engineering depth matters far more than prior finance exposure, which is typically taught on the job. Many strong engineers in this space come from general technology companies, hardware backgrounds, or academic research with no prior market knowledge at all.
How is interview preparation different from a typical tech company process?
Significantly. Most top firms have moved away from pure algorithmic interview formats toward questions that test genuine systems understanding, how a data structure performs under memory pressure, how virtual functions actually get implemented at the compiler level. Preparing the way you would for a generalist tech interview, heavy algorithm drilling, often misses what these processes actually test for.
What does the work actually look like once you're in the role?
Fast-moving and closely tied to real outcomes. Code built this week can be live and measurably affecting trading results within days, a faster feedback loop than most software engineering roles offer. Depending on which track you’re in, trading systems, risk, tooling, or data infrastructure, the day-to-day work varies considerably, but the underlying pace and accountability tends to be consistent.
What should I focus on if I want to move into software and systems engineering?
Build genuine depth in systems-level engineering, and get specific about which track actually interests you rather than treating “software engineer at a trading firm” as one single goal. Real, demonstrated performance engineering experience, something you’ve built and can talk through in real depth, carries far more weight than a broad list of languages and frameworks on a CV.
