developer python javascript jobs in City of London

Full Stack Python / JavaScript Developer - London - £60k 1-2 days per week in office My prestigious financial services client is looking to expand their digital transformation team and require an experienced Full Stack Developer with strong Python & JavaScript to join them working across a range of new initiatives Core skills across Python and JavaScript with experience in Django and/or React...

Job Description React Native Developer - Hybrid - Outside IR35 | React Native | FinTech | JavaScript | TypeScript We’re working with a fast-growing FinTech in London that’s building next-generation mobile products used by thousands of customers daily. They’re looking for an experienced React Native Developer to join the team on a contract basis, contributing to high-impact features across their...

Job Description Senior Software Engineer (Python) – Contract | Outside IR35 💷 £550–£650/day | ⏳ 6 months+ | 📍 Paddington (3 days onsite) We’re partnering with a well-funded, fast-scaling AI & tech upskilling platform that works with 1,500+ organisations to help people build real-world skills in data, AI, and software engineering. This is a chance to join a high-calibre product engineering...

Job Description A well-funded, high-growth tech company is building the next generation of automation tools—reimagining how complex, manual work gets done in the financial services world and beyond. They’re now looking for a Python Developer to help design and build intelligent systems that make that future a reality. Role: Senior Python Engineer Salary: £65,000 - £75,000 Location: Central...

Exciting Opportunity: Python Developer (Contract) in London Introduction Are you a talented Python Developer ready to take on your next challenge? Our client, a leading organisation based in London, is looking for a skilled developer to join their team on a contract basis. In this role, you'll play a crucial part in developing and maintaining a robust tech stack and ensuring excellent...

Job Description Senior Python Quantitative Developer sought by a specialist and multi-award-winning Systematic Hedge Fund in a brand-new Core team designing and implementing a greenfield centralised Python/SQL/Linux/Docker platform for Backtesting, Pricing, Risk and Performance to be used across all Funds and Investment teams. Our client is an early Quantitative Investment Firm, managing around...

Job Description You’ll join a team dedicated to pushing the boundaries of what’s possible in the trading world, using innovation to drive real results. Python API Engineer – London What you will do - Maintain and develop SaaS products offering, pioneering innovative approaches to achieve the company's vision. For example, integrating cutting-edge AI models or developing new analytical...

You will collaborate closely with quants, data scientists, and traders, providing Python-based solutions that directly impact the profitability of the business. This is an exciting opportunity to work in a fast-paced, high-performance environment where you can push the boundaries of technology in financial markets.

Job Description Core Developer (Python) - Algo Trading Firm - London - Up to £350k+ TC (DOE) One of London's most impressive Algo Trading firms is looking for Engineering Wizards to join their team in London. Having arguably one of the best technology teams in the world, the firm is in a stage of hypergrowth, looking to deliver on its ambitious plans to be a leading liquidity provider in the...

Job Description We are currently recruiting full stack developers to join a trading technology team at a leading investment firm. This team is responsible for building a new front-office trading platform used directly by traders and quants. These roles are best suited for candidates with experience in full stack development using React and Python and particularly those who have built trading...

Job Description Paragon Alpha are working with a hedge fund famous for mid frequency equity trading, while also having a successful L/S Equity desk running strategies out of London. The desk need to hire two Quantitative Developers in London, to build signal generation frameworks, back-testing engines, and full stack trading apps. You would be on a specialised desk and partnering with traders...

Job Description numi have once again partnered with a leading player in alternative asset management is reshaping the treasury function. With cutting-edge technology and a seasoned team of industry experts, this company aims to reduce financing costs and optimize return metrics. Who We're Seeking: - We're on the lookout for a seasoned mid-level Software Engineer with up to 6+ years of hands-on...

Front Office FX Trading Technology - Global Banking & Markets A leading global investment bank is seeking a Python Developer to join its Front Office FX Options Technology team. This is a high-impact role where you’ll work closely with traders and developers to build cutting-edge, high-performance trading systems - leveraging big data and algorithmic models to analyse and predict market...

Job Description 🚀 Senior Python Engineer Location: London / Hybrid / Remote (UK & NL time zones) Type: Full-time Salary: Up to 85k + benefits Are you a Python engineer who loves tackling complex problems with math and analytics? 🧠💻 We’re searching for a Senior Python Engineer to help build cutting-edge software used by top global brands for forecasting, optimization, and analytics. This...

Job Description We are partnering with one of London’s most selective and highest-performing quantitative investment funds to appoint a Quant Developer to their core systematic trading group. This is a confidential mandate for a team renowned for world-class engineering standards, scientific rigour, and a culture built around high impact and low ego. The successful candidate will work at the...

You will work on complex scraping problems where naïve approaches do not work-dynamic rendering, sophisticated anti-bot defences, frequent markup changes, and high-volume data collection. We are leaders in adopting AI-assisted and agentic coding workflows. This role is ideal for someone who believes in leveraging AI tools to accelerate development and wants to deepen their skills in this area.

Job Description Job Title: QA Automation Engineer (Python / PyTest / Cosmos DB)-Banking Client Exp Required Location: London- 3Days/week Onsite Duration: 6months+ Contract Inside IR35 500GBP/Day Role Overview We are looking for a QA Automation Engineer to join a Pod-based delivery team working on critical applications and data platforms within a global financial market's environment. The...

You will join as a more junior member, as part of a small team designing and implementing a central platform for Backtesting, Pricing, Risk and Performance, to be used across all Funds and Investment teams. Finance experience is not an essential criterion.

Founding Engineer Location: London King's Cross (Relocation Supported) - onsite We are partnered up with an early-stage, well-funded AI platform company solving complex problems for large, highly regulated enterprises. The product is already live, customers are active, and the company is scaling fast but the engineering team is still growing. This is a true founding engineering position with real...

You will be responsible for building and maintaining business-critical systems, developing automation for deployment, monitoring, and incident response, and collaborating closely with developers, researchers, traders, and platform teams to improve reliability, performance, and scalability across the platform.