senior python developer jobs in London

Weekday AI, a client of Weekday's, is seeking a Senior Software Engineer with deep Python expertise to join the London-based engineering team. You will design, develop, and maintain scalable backend systems and APIs while shaping technical architecture and mentoring junior engineers.The ideal candidate has 6–11 years of professional Python experience with...

Spectrum IT Recruitment is seeking a Senior Python Developer to join a government technology programme in London, offering hybrid work with two days on-site. You will help build secure enterprise platforms, write production‑quality code, and drive automation tooling across cloud and on‑prem environments.The role focuses on infra automation, IaC with...

Senior Salesforce Developer / £70,000-80,000 / RemoteAny additional information you require for this job can be found in the below text Make sure to read thoroughly, then apply.I'm currently working with a fast-growing Salesforce implementation partner who are on the lookout to add an extra pair of technical hands to their remote workforce as soon as...

Project descriptionWe are looking for a senior Python developer to join our client's team and lead the build of a new data and application platform. The team focuses on clean code, agile methodologies, and high-quality delivery. The client is from the investment banking industry.ResponsibilitiesDesign, develop, and maintain scalable back-end services and...

Spectrum IT in London seeks a Senior Python Developer to join a hybrid team, delivering production-grade software and infrastructure automation. You will lead engineering across cloud and platform domains, building automation and tooling with Python, IaC, and CI/CD practices.This role emphasizes infrastructure automation challenges, scalable cloud tooling,...

Be the SME in a close knit, agile team. You will be the Java expert, utilising a Spring framework to build and evolve their internal systems. This work will have a genuine impact on the business, so you must have an awareness of what influence your code will have on the company. The wider technology would see you work with Ubuntu, MySQL and Docker, exposure...

Greater London 475 - 575 per day Contract Senior ServiceNow Developer – Contract 475-575/day (Umbrella) | Inside IR35 | Very occasional travel We’re looking for an experienced Senior ServiceNow Developer to join a major enterprise environment, delivering scalable ServiceNow solutions across workflows, integrations, automation and platform...

Client Server Limited is building cybersecurity technology that uses AI to protect clients worldwide from advanced cyber threats. The role involves creating a new greenfield product, rapidly prototyping ideas, and driving continuous improvement in a fast-paced development environment.The candidate will tackle complex problems with strong Python skills and...

We are looking for an experienced .NET/C# Developer to join a Front Office Commodities Markets IT team based in Central London. The role involves developing and supporting business-critical trading applications, working closely with Front Office users and global technology teams in a fast-paced financial markets environment. This is a contract position...

JPMorgan Chase & Co. is seeking a Software Engineer III (Java/Python) to join the Commercial and Investment Banking Emerging Markets Team in London.You will contribute to an agile team delivering secure, scalable market-leading technology products, writing production quality code in Java and Python, and applying modern testing and automation practices....

Senior Software Engineer / Developer (Python Data) London / WFH to £140kAre you a Senior Software Engineer with strong Python coding skills who enjoys building robust, high performance systems from complex quantitative research?You could be progressing your career at a fast-growing energy technology company, backed by major investors, that is transforming...

Senior Software Engineer / Lead Developer (Python GCP FastAPI) London / WFH to £120kAre you a skilled Python Developer with leadership experience?You could be progressing your career at a well-funded and profitable FinTech start-up.As a Senior Software Engineer your role will blend technical leadership and software engineering, giving you the opportunity to...

Cedar Technology in London is recruiting a Senior Research Scientist to lead quantitative studies using Python, R and AI. Hybrid role, combining scientific rigour with practical data science and tool development for healthcare analytics.You will work with leadership and engineering teams to develop methodologies, manage large datasets and publish scientific...

Cognizant is seeking a Python Engineer to design, build and enhance the Digital Onboarding Service within the client API Platform. You will work with the Lead Engineer in an Agile team to deliver high quality, scalable features.You will develop RESTful APIs and microservices in Python (FastAPI/Flask), using serverless and containerized AWS architecture...

About our TeamWorking within Information Security & Data Protection division, the content protection platform team builds scalable technology solutions that detect and prevent fraud, theft, and piracy while protecting legitimate customer use. Working as a fast-paced agile squad, the team designs and develops software using modern engineering practices,...

The Department for Business, Innovation, Science and Trade (BIST) and its DDaT directorate recruit for a Senior Software Developer (Python) role based in London. Company: Government Recruitment Service. Salary: £68,732 to £88,423 per year. Hours: Full-time.Posting 23 Oct 2026, closing 9 Nov 2026. Join a diverse, inclusive team delivering modern digital...

Senior Research Scientist | Python, Statistics & AI Location: London (Hybrid, 2 days per week onsite)Salary: £80,000-£90,000 + benefitsEmployment Type: Permanent, Full TimeSector: Healthcare Analytics/Behavioural Science/AI Turn complex human behaviour into scientific insight that could transform healthcare. What if your research could help healthcare...

J.P. Morgan is seeking a Software Engineer III (Java/Python) to join the Commercial & Investment Banking Emerging Markets Team in London. You will contribute to building secure, scalable, production-ready software and participate in agile development, code reviews, testing, and deployment.The role emphasizes high-quality production code, AI-assisted tooling,...

JPMorgan Chase seeks a Software Engineer III (Java/Python) to join the Commercial & Investment Banking Emerging Markets Team in London. The role focuses on building, enhancing and delivering secure, scalable market-leading technology products within an agile team, contributing across design, development, testing, and operational stability.You will work with...

Cognizant Technology Solutions Corporation is seeking a Senior Developer to own end-to-end technical delivery in London. You will design and build scalable Python applications and secure AWS data pipelines, leveraging PySpark for large-scale transformations.Work closely with product owners to translate regulatory requirements into robust technical solutions,...