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Flow Traders

Senior Software Engineer, C++

Flow Traders is hiring a Senior Software Engineer, C++ in London, United Kingdom. Level rates it ; you can apply on Flow Traders.

Level's read on this job

  • Little AI ●○○○ is how Level rates this software engineer role: aI is not part of the work.
  • The posting mentions C, low latency and market data among its tools and skills.
  • Level classes it as a senior role.
  • Flow Traders has 43 other open roles on Level.

AI in this role

Lead next-generation C++ architecture for market data and execution platforms powering systematic trading.

C
low-latencymarket-dataalgorithmic-tradingconcurrencyperformance-optimization

Flow Traders is looking for a Senior C++ Software Engineer to lead the next-generation architecture of the market data and execution platforms that power our fully systematic trading. We don't treat market data as plumbing - for us it's a source of alpha, where feed handling, order book construction, and a deep understanding of exchange microstructure are themselves a competitive edge. We're looking for a senior individual contributor who has lived this philosophy in a proprietary or systematic trading environment and can squeeze every nanosecond out of the path from wire to strategy.

As a senior individual contributor, you'll help set the technical direction for the Core Platform that underpins quantitative research, pricing, strategy development, and execution across hundreds of venues - and drive its global rollout across our Market Data, Quant Research, Pricing, and Strategies groups. You'll work in a tight, iterative loop with quants and technical traders, applying deep expertise in modern C++, OS internals, CPU and memory architecture, lock-free concurrency, and low-latency networking to push our systems toward state-of-the-art performance, robustness, and observability.

What you will do:

  • Lead the development and global rollout of our Core market data platform used across multiple focus areas (Market data, Research engineering, Pricing, Strategies).
  • Design and implement high‑performance components for market data ingestion, normalization, and distribution, as well as its usage for order execution and strategy infrastructure.
  • Develop tools and frameworks that enable quants and technical traders to build, tune, and deploy data‑driven systematic pricing and trading strategies.
  • Own the full lifecycle of your components in a fast‑paced, iterative environment: deploy, monitor, profile, and optimize your code in production.
  • Work closely with focus group engineers, quants, and technical traders to refine requirements, collect feedback, and iterate on the platform's design and implementation.

What you need to succeed:

  • BSc, MSc, or PhD in Computer Science, Mathematics, or a related field.
  • 7+ years of post‑graduation professional C++ software development experience.
  • Experience building low‑latency market data ingestion, order execution, and algorithmic trading systems (proprietary trading industry preferred).
  • Strong knowledge of algorithms and data structures.
  • Experience in parallel, asynchronous, and multithreaded programming.
  • Demonstrated ability to write clean, reliable, and highly scalable C++ code.
  • Interest in extracting maximum performance from available hardware and software (CPU caches, memory layout, networking, etc.).
  • Ability to communicate effectively with both technical and non‑technical colleagues.

Flow Traders does not accept unsolicited resumes from any professional staffing or search firms. All resumes, and any other information identifying potential candidates, submitted to any employee at Flow Traders via email, the Internet or directly without a valid and signed search agreement will be deemed free to contact by Flow Traders without any restrictions and no placement fee of any kind will be paid in the event the candidate is hired by Flow Traders

How we rate this

Senior Software Engineer, C++ at Flow Traders rates 0 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

  1. ●●●● Builds AI80 to 100
  2. ●●●○ Works on AI60 to 79
  3. ●●○○ Uses AI40 to 59
  4. ●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.

Prepare for this job

Built from this posting and from similar jobs on Level.

Skills and AI tools this role asks for

Low LatencyMarket DataAlgorithmic TradingConcurrencyPerformance OptimizationC

Also common in software engineer jobs at this level

Pay

Typical software engineer job
$167k

This posting doesn't list pay. Use the typical software engineer figure when pay comes up. See software engineer jobs

Questions you could be asked

  1. Tell me about a project where low latency was part of your work. What did you do?
  2. Tell me about a project where market data was part of your work. What did you do?
  3. Tell me about a project where algorithmic trading was part of your work. What did you do?
  4. Tell me about a project where concurrency was part of your work. What did you do?
  5. Tell me about a project where performance optimization was part of your work. What did you do?

Adapt your resume

  • List these exact terms on your resume: Low Latency, Market Data, Algorithmic Trading, Concurrency, and Performance Optimization. An applicant tracking system matches the wording, not the idea.
  • Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.

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