We are looking for an experienced Senior Python Software Engineer to take ownership of an established trading-related application and drive its ongoing development. You will manage and enhance the existing codebase, deliver new features, ensure reliability and performance, and help evolve the system as the business grows.

This is an excellent opportunity for someone who enjoys autonomy, technical responsibility, and working on low-latency, high-performance applications.

What Youll Do

Maintain, extend, and optimise an existing Python-based trading application

Add new features and improve current capabilities with a focus on performance, reliability and clean architecture

Build and optimise real-time pipelines handling high-frequency data

Improve latency, throughput, and reliability using profiling and performance engineering

Work with Redis, Azure VMs, and Anaconda environments

Implement and maintain systems requiring millisecond-level timing precision

Troubleshoot production issues quickly during key market hours

Collaborate directly with the founder to shape technical direction and priorities

Integrate with market data feeds and brokerage/order-routing components

Essential Skills

Expert-level Python developer (min. 5+ years professional python experience)

Demonstrable experience with low-latency/high-throughput systems (e.g., real-time data processing, trading/market data, telemetry, adtech bidding, streaming systems, etc.)

Strong understanding of asynchronous programming, multiprocessing, and performance optimisation

Experience handling large volumes of fast-moving data with careful performance considerations

Ability to profile, measure, and improve performance

Comfortable owning an existing codebase: refactors, architecture improvements, clean tests

Experience with Redis and general database performance considerations

Competent with Azure cloud environments (VMs, deployment, monitoring, etc.)

Comfortable working independently, making architectural decisions, and maintaining high code quality

Strong engineering discipline: correctness, edge cases, careful time-handling, attention to detail

UK-based and available for support during core market hours when needed

Desirable Skills

Experience with algorithmic trading or market data systems

Familiarity with Interactive Brokers TWS or other brokerage APIs

Experience with distributed systems, message queues, or event-driven architectures

Background in financial markets or fintech

What We Offer

Competitive salary - negotiable based on experience

Mostly remote, with some in-office collaboration days for coordination and planning

Yearly bonus based on company performance

The chance to take significant ownership of a live, production-grade system

Long-term role with the opportunity to influence the roadmap and system design

A lean environment with minimal bureaucracy and direct impact

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