26 to 50 of 81 Senior Developer Jobs in the City of London

Senior Data Developer – Hedge Fund | London (Hybrid) Are you an experienced data developer who loves building fast, reliable systems that fuel quantitative trading and risk management? A global multi-strategy fund is expanding its London data team to build the next generation of its market data platform ...

Senior Backend Developer 40 hours per week Inside IR35 Hybrid 1 office day London Farringdon office address: 47-53 Charterhouse St, London, EC1M 6PB Start date: January 2026 Join a dynamic energy provider dedicated to sustainable solutions in the UK. We seek enthusiastic and resourceful Backend Python Engineers … senior levels who are passionate about crafting exceptional products. Initially it will be a three-month contract but there is potential for it to be extended. The role is Hybrid, with one day a week being based in their London. It is a full-time role, 40 hours ...

Senior Python Developer looking to help shape the future of how schools use technology to empower learners across the UK? We are searching for a Senior Python Developer/Lead Python Developer who can guide a talented engineering team and push the boundaries of what ...

funds, Asset Managers, listed Corporates, high-growth tech companies and many more. Learn more about why we do what we do here. The role: Senior Python Developer Join our lean UK-based technology team as a Senior Python Developer, where you'll play a pivotal role ...

Senior Fullstack Engineer - Fintech Scale-Up (Java, Angular, Azure) Titles: Senior Fullstack Engineer Tech Stack: Java | Spring | Azure | Angular Location: London (Hybrid - 2-3 days/week) Package: £85-95k + 20% bonus The Company: Growing fintech working with major banks on business banking products, providing solutions … serving thousands of businesses. The Role Hiring a Senior Fullstack Engineer to build scalable Java microservices for core banking platforms. Take ownership of key components and work with a talented team on high-performance financial solutions. What you'll do as a Senior Fullstack Engineer: Design and develop ...

Senior Software Developers specialising in trading systems required for an excellent client based in London. The successful Software Developer will join a extremely talented development team and you will be exposed to creating and maintaining our client's own applications based around a C#/.NET/ ...

Senior Python Developer – Multi-Billion Dollar Hedge Fund - Mortgage Technology - London - Hybrid – Up to £300k TC My client, a leading UK hedge fund with $70 billion in AUM, is seeking to appoint a Senior Python Developer within its technology organisation. Our client is undertaking … pivotal role as the firm continues its migration away from legacy systems and enhances its bespoke internal platforms. The Role As a Business Engineering Developer, you will: Build, enhance, and maintain applications supporting mortgage origination, valuation, analytics, and reporting. Develop production-ready Python code to automate manual processes ...

Senior Frontend Engineer Full remote role with office in London, 12 month contract, Outside IR35 A global consumer-facing technology organisation is refining its web strategy to focus on building secure, scalable, and high-quality web experiences that support multiple brands and empower Marketing teams. As a Senior ...

Senior Python Engineer — Fully Remote | High Ownership | Modern Backend Systems I’m hiring for a Senior Python Engineer who wants meaningful ownership, technical depth, and the freedom to work from anywhere. This role is ideal for a seasoned engineer who’s built large-scale systems, cares about clean …/ML-powered features Improving performance, reliability, and scalability across core systems Leading design discussions and influencing long-term architecture Collaborating with a sharp, senior team in a low-ego, high-impact environment What We’re Looking For 6–12+ years of professional Python engineering experience Strong background ...

Markets operates a high-availability trading environment supported by institutional-grade liquidity and technology. About the Role We are seeking a highly capable Senior Web Developer to lead the design, development, and optimisation of high-performance websites and digital experiences that support product launches, marketing campaigns, and customer … maintain technical documentation for website systems, processes, and product pages Provide technical support to marketing, content, and product teams Qualifications Proven experience as a Senior Web Developer delivering high-quality, production websites Strong expertise in HTML, CSS, and JavaScript Solid commercial experience with WordPress, including: Custom theme development ...

Senior Frontend Engineer – Join a profitable FinTech Scale-Up 🚀 💰Up to £110,000 🏡Hybrid working – once a week onsite in London 💻React, TypeScript, API experience We’re partnered with a leading FinTech scale-up who are transforming how small businesses access finance to grow and scale. The business ...

Senior Frontend Engineer - London Based 🚀 They've been named a Disruptor in the industry for their mission that is putting users in control of how their data is being used! ⚒️ Tech stack: React, JavaScript, Next.js ✨ Your role: as the Senior Frontend Engineer you'll partner with the backend ...

Senior Front Office Developer | Commodities & Energy Trading | C# .NET | Azure | 110k | London (Hybrid) We are looking for a Senior Front Office Developer to join a high-performing trading technology team in London, focused on commodities and energy markets . This is a hands-on role building ...

client, a leading Financial Institution, is looking for a Senior D365 Developer to join their team on a 12-month fixed-term contract. You’ll play a key role in enhancing the D365 platform, delivering customer-focused, resilient solutions that make a real difference for colleagues and customers … solutions are aligned with strategy, secure, and future-proofed Identify opportunities to simplify processes and improve efficiency What You’ll Bring: 5+ years D365 Developer experience (Sales, Service, Marketing modules) Expert in Microsoft Dynamics 365, Power Platform, Azure integration services, DevOps (GIT, Azure DevOps, CI/CD) Experience providing ...

Contract FX .NET Developer - £600/day - OUTSIDE IR35 - Global Commodity OTC & Brokerage Firm - London A leading global commodities OTC & brokerage firm is seeking an experienced Senior Systems Developer with strong FX business knowledge to join on a contract basis. This role sits at the intersection … Support risk reporting systems and processes using C# Required Skills & Experience Deep business context and hands-on experience in FX (essential) Classic systems solutions developer skillset, comfortable working across the full development lifecycle Strong understanding of and ability to work effectively with libraries (internal and external) Proven C# development ...

client is looking for a Senior Full Stack Developer to play a pivotal role in modernising critical systems and processes, improving efficiency, and reducing operational risk. You will work closely with multidisciplinary teams to design, develop, and maintain robust full stack software solutions. The role spans the entire … support service users, attend in-person team meetings, and visit operational sites to understand user needs and test solutions Key Responsibilities As a Senior Full Stack Developer, you will: Design, develop, and maintain full stack software solutions using modern technologies Collaborate with internal teams to design, create ...

Python Developer - Python, Django, REST API's, AWS, JavaScript OB are partnered with a Global Financial Services company, who are looking to add a highly skilled Python Developer to their team. In this role, you'll be working their Python backend systems, developing new features and collaborating with … different teams, to ensure product goals are met. Python Developer - Python, Django, REST API's, AWS, JavaScript Key Skills and Experience: Strong knowledge of Python Experience with Python frameworks (Django preferred) PostgreSQL REST API'S Docker Cloud experience (AWS preferred) Knowledge of Frontend Technologies (JavaScript, HTML, CSS) This ...

digital agency, specialising in developing brands and digital experiences for global 'tech for good’ clients. We are on the hunt for a talented Frontend Developer to join our small, fully remote team as a full-time Frontend Web Developer specialising in Shopify. We are in search ...

Sr. Full Stack Developer - Asset Management Firm - London/Manchester (Hybrid) - Basic salary of up to £85,000 + Bonus and Additional Benefits package Hays are currently working exclusively with a leading asset management firm assisting them in the recruitment of an experienced Full Stack Developer … work in a hybrid capacity, 3 days per week in office, in either Central London or Manchester.This is a great opportunity for an experienced developer to join an established development team within a high-end financial services firm. The role We're looking for an experienced and enthusiastic full ...

Title: Senior Full-Stack Developer (Python) Rate: £750 p/d Duration: 6 Months Location: Remote Clearance: BPSS (must have) This role is ideal for an experienced contractor with expert Python knowledge who enjoys working across backend and frontend, collaborating closely with data scientists, and delivering secure, scalable ...

established UK financial institution is seeking an Senior RPG Developer to join its expanding technology team at a pivotal moment of transformation. With a major platform modernisation and migration programme underway, this is an exciting opportunity to help shape the future of their core banking systems. The organisation … development follows agreed standards, governance frameworks and secure engineering practices while meeting expected timelines. The ideal candidate will have proven experience as an RPG developer with strong knowledge of SQL (including embedded SQL), familiarity with modern IBMi development techniques such as modules, service programs and activation groups, and hands ...

Title: Senior Kotlin Developer Client: Leading Trading Firm Rate: Up to £850 p/d Duration: 6 Month - Rolling Location: London - Hybrid We are looking for a Java Developer, with strong experience working in the finance sector, to join a leading trading firm based in London ...

Senior UI/UX Designer & Frontend Developer – Mobile, Figma, JavaScript, React - Global Outstanding opportunity to join this global enterprise and famous brand within the ‘magic circle’ of the legal sector. From a technology perspective, this organisation is a leader in its domain, significantly investing in AI and automation … within an established cloud native (Azure), DevOps and Agile environment. We are seeking a creative and technically skilled Senior UI/UX Designer & Frontend Developer with a genuine combination of design (Figma, Adobe) and development (JavaScript, React) experience to join a team building a highly innovative, mobile first ...

Exciting Contract opportunity for a Senior Endur Developer with experience in Greenfield ETRM Implementations to join a multi-year programme at a World Leading Company. The candidate will need to have deep expertise in Endur system configuration as well as having strong Gas & Power domain knowledge. Core Technical ...

division. You won't just be joining a team; you'll be the first to help build and shape it. As a Senior Backend Developer, you will: Design & Scale Core Pipelines: Architect, implement, and deploy our complex, highly-scalable data processing pipeline focused on analyzing massive amounts ...