Python Senior Software Engineer

November 4, 2026

Hybrid

Senior

London Area, United Kingdom

Description

We are partnering with a world-renowned trading firm to hire exceptional Python Engineers for a highly sophisticated engineering organisation. The role involves building complex, scalable and high-performance software in one of the most technically demanding environments in the industry. The engineer will own projects across the full software development lifecycle and influence architectural decisions on critical technology platforms.

Responsibilities

Design, develop and maintain complex, production-grade Python applications
Build scalable platforms, services and infrastructure supporting a global technology environment
Develop distributed systems, asynchronous applications and sophisticated backend services
Engineer internal frameworks, automation tools and developer platforms
Design efficient APIs and integrate systems across complex technology ecosystems
Focus on software performance, reliability, scalability and maintainability
Work with large-scale data processing, databases and distributed computing technologies
Drive architectural decisions and influence the development of critical technology platforms
Take ownership of projects throughout the full software development lifecycle, from initial design through to production
Collaborate with talented engineers and stakeholders to deliver technically challenging solutions

Requirements

5+ years of professional software engineering experience
Exceptional Python programming skills and strong knowledge of modern Python
Strong understanding of software design principles, data structures and algorithms
Experience building scalable, distributed and highly available applications
Strong knowledge of asynchronous programming, concurrency and multithreading
Experience developing backend services, APIs and microservices
Strong understanding of Linux and production engineering environments
Experience with databases, data structures and efficient data processing
Excellent debugging, problem-solving and system design capabilities
A track record of building and maintaining complex, production-critical software
BSc or MSc in Computer Science or similar
C++, Rust, Java or other programming languages
High-performance computing, low-latency or high-throughput environments
Distributed computing frameworks and large-scale data processing
Cloud infrastructure, containerisation, Docker and Kubernetes
SQL, database internals, caching and messaging systems
CI/CD, testing frameworks and developer productivity tooling
Experience within financial services, quantitative trading or other technically demanding industries