> Markdown version of [/jobs/ext/1119504-senior-python-developer](https://www.wearedevelopers.com/jobs/ext/1119504-senior-python-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Python Developer - **Company:** Harrington Starr - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), C++ (Programming Language), Information Engineering, Data Infrastructure, Python (Programming Language), Software Engineering, Build Management, Data Management, Data Pipelines - **Published:** July 2, 2026 - **Apply:** https://find.jobs/jobs-near-me/apply/ats-redirect/?id=2850734348-2 ## About the Role * Strong software engineering fundamentals across architecture, design, and quality practices * 5+ years' experience in platform engineering, quant development, data engineering, or software engineering within financial services * Strong Python experience in production environments * Exposure to C++ or Rust would be beneficial for performance-sensitive components * Experience building data infrastructure such as APIs, pipelines, and time-series systems * Good understanding of financial markets, ideally rates or derivatives * Strong communication skills and ability to work across engineering, research, and trading stakeholders Why consider it * High-impact role working directly on trading-critical systems * Strong blend of engineering depth and business exposure * Close collaboration with quants, traders, and portfolio managers * Opportunity to shape a growing platform in a high-performing fintech environment ## Description This is a senior engineering technology role focused on the core analytics platform that underpins pricing, screening, and execution workflows. You'll play a key part in designing and evolving production systems used by traders, quants, and portfolio managers, with ownership across reliability, scalability, and performance. The role would suit someone with strong platform engineering instincts who enjoys building robust systems in fast-moving trading environments. Direct derivatives knowledge is helpful, but strong engineering capability is the bigger priority. What you will do * Design and build core platform components including pricing services, APIs, and data pipelines * Develop scalable ingestion and processing systems for market, macro, and time-series data * Build internal tooling that improves how analytics and trading signals are developed, tested, and deployed * Own the full software lifecycle across design, coding, testing, monitoring, and continuous improvement * Create performant screening and trade discovery tools * Work closely with traders and quants to turn analytical requirements into production systems * Improve observability, deployment processes, and developer experience across the platform ## Related Videos - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) - [Why and when should we consider Stream Processing frameworks in our solutions](https://www.wearedevelopers.com/videos/1085-why-and-when-should-we-consider-stream-processing-frameworks-in-our-solutions) - [It's all about the Data](https://www.wearedevelopers.com/videos/425-it-s-all-about-the-data) - [Answering the Million Dollar Question: Why did I Break Production?](https://www.wearedevelopers.com/videos/1171-answering-the-million-dollar-question-why-did-i-break-production) - [Python-Based Data Streaming Pipelines Within Minutes](https://www.wearedevelopers.com/videos/1233-python-based-data-streaming-pipelines-within-minutes) - [The Data Mesh as the end of the Datalake as we know it](https://www.wearedevelopers.com/videos/156-the-data-mesh-as-the-end-of-the-datalake-as-we-know-it) ## Related Articles - [The 13 Best Python Libraries for Developers in 2025](https://www.wearedevelopers.com/magazine/371-the-13-best-python-libraries-for-developers-in-2025) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [The 7 Most Popular Backend Frameworks for Developers](https://www.wearedevelopers.com/magazine/403-the-7-most-popular-backend-frameworks-for-developers) - [Data Analyst Salary in the UK](https://www.wearedevelopers.com/magazine/278-data-analyst-salary-in-the-uk) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk)