1 to 25 of 34 Permanent Senior Software Engineer Jobs in the City of London

Senior Software Engineer/Team Lead (Windows C/C++, C#) London to £115k FTC Are you a skilled C++ Software Engineer with technical/team leadership skills looking for a new opportunity? You could be progressing your career in a senior, hands … role at a global market data provider. As a Senior Software Engineer/Team Lead you will head-up an Agile team (5 engineers) focussed on building and maintaining Exchange Connectivity software systems that require real-time and low latency, maintaining data feeds and developing ...

Senior Software Engineer Key Technologies: C#, .NET, React, JavaScript, Typescript, AWS, Docker City of London, United Kingdom Perm Role: £80,000 - £120,000 Harrington Starr has partnered with a Global Financial Services Vendor and they are looking for a Senior C#, .NET Software Engineer … work in the UK. This role offers hybrid working, with an office location based in the City of London. This role will suit a Senior Software Engineer, with expert C#, .NET experience having a direct impact from the get-go. ...

Senior Software Engineer (Node.js) London – Hybrid flexible Up to £80,000 + equity We’re currently partnered with a real-time sports data platform that is revolutionising how companies leverage data to empower their business. They are looking for a performance focused Senior Engineer with … stage start-up and contribute to building a company that puts its internal teams and customers first. This is an exciting opportunity for a Senior Software Engineer to help shape the future of a transformative real-time data platform. If you’re passionate about building world-class ...

Senior Software Engineer/Team Lead (Windows C/C++, C#) London to £115k FTC Are you a skilled C++ Software Engineer with technical/team leadership skills looking for a new opportunity? You could be progressing your career in a senior, hands … role at a global market data provider. As a Senior Software Engineer/Team Lead you will head-up an Agile team (5 engineers) focussed on building and ma click apply for full job details ...

Senior Embedded Software Engineer Salary : Up to £100,000 Location : London - 3 days a week We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations … connecting users with seamless, intelligent technology solutions. We are looking for a modern, innovative and driven Senior Embedded Software Engineer to join their growing team. They are looking for someone who has commercial experience working with C software development in an IoT, hardware or embedded solutions ...

Senior Software Engineer 📍 Location: Onsite, London, United Kingdom ⌛ Type: Full-time 💰 Compensation: Negotiable (Competitive salary + equity) About Ontik Ontik is an ambitious, early-stage B2B financial operations platform designed to streamline and simplify complex financial workflows for heavy duty industries. We’re scaling rapidly and looking … high-performance, ownership-driven environment, where you can make a direct impact on the product and help shape its future. Role overview As a Software Engineer (Full-Stack) at Ontik, you’ll play a pivotal role in building and scaling our financial operations platform. This is a hands ...

Senior Software Engineer (.NET, C#, Java) £90,000 - £100,000 Office Location: Central London (Hybrid) We have partnered up with one of the largest Saas businesses that help numerous FinTech organisations across the UK and EU. This Senior Software Engineer will join a high … team building a next-generation analytics platform designed to ingest, transform, and materialise massive observability datasets. This is a hands-on role for an engineer who excels at building complex distributed systems Key Responsibilities Core Development: Design and deploy high-performance backend services and APIs using C#/.NET ...

Senior Software Engineer (.Net & Angular) - £70,000 – £85,000 pa + 25% Bonus + Benefits I am working with a leading professional services client in London that are looking for a Senior Software Engineer with full stack capabilities to join a small but talented ...

Senior Software Engineer, Python, Django, ReactJS, JavaScript, PHP, Mainly Remote, Central London Senior Software Engineer (Python, Django, ReactJS) required to work for a fast growing and exciting business based in Central London. However, this role is mainly remote. We need an experienced Python Developer ...

Senior Software Engineer Location: London (x3 days a week onsite) Salary: Up to £80k DOE Type: Perm Job Description We are looking for a passionate Senior Java Engineer in London to lead the design and development of core product features and services that power … used by thousands of travellers on a daily basis. As a Senior Java Engineer for an loyalty program team, you will have the opportunity to make a massive impact on traveller's behaviour and booking experience. Specifically, you’ll be responsible for driving improvements to loyalty offerings that ...

Senior Backend Software Engineer (Python) Blockchain/Web3 Remote £50-£80k An ambitious Web3 and blockchain-focused team working to create more equitable ownership and compensation models, particularly within gaming. They collaborate closely with leading Layer 1 protocols to deliver secure, scalable infrastructure and provide global economic … opportunities through blockchain technology. The Senior Software Engineer will build and maintain backend systems powering cutting-edge Web3 and gaming technologies. The role focuses on developing REST APIs using Python frameworks (such as Django or Flask) and integrating blockchain and Web3 game technologies as part ...

next generation of AI models to assist artist workflows. See the result yourself Passcode: scaneverything About the role ✨ We are looking for a Senior Software Engineer to own the 3D asset processing and rendering infrastructure in Marso Measure, our desktop material capture application for Windows. …/game workflows and wants to work at a startup connecting frontier AI to 3D asset creation. Where you will have impact 🚀 As a Senior Software Engineer you will own the 3D rendering and asset processing systems that power our material estimation technology and ship Marso Measure ...

Senior Software Engineer/Developer (LLM TypeScript Node API) London/WFH to £100k Are you a senior technologist with experience of productionising LLMs? You could be joining a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional … marketplace where institutions can place, discover and match option interests electronically - improving liquidity and efficiency for all participants as the platform scales. As a Senior Backend Engineer you will collaborate with a small team of technologists and successful entrepreneurs to design and implement intelligent solutions to business needs ...

Senior Software Engineer (Python) 💰 Up to £130,000 + excellent benefits (including work from abroad) 📍 Hybrid - 2 days onsite in Central London (London Bridge) Are you a Senior Python Engineer who loves solving deep technical challenges? Want to help reinvent how future hardware is created … building a revolutionary platform that turns high-level hardware requirements into complete circuit designs. You’ll work on complex problems at the crossroads of software, data and engineering, collaborating with experts across multiple disciplines. What You’ll Do Own and evolve backend systems across data models, algorithms, infrastructure ...

Title: Senior Software Development Engineer in Test (Senior SDET) Location: London (3 days onsite minimum) Contract Length: 6 months – initial Rate: negotiable Start Date: ASAP Company Overview Our client is a leading innovator in the medical technology space, committed to delivering high-quality, reliable device platforms … culture where quality engineering is driven by code, collaboration, and cutting-edge practices. Role Overview We are seeking a highly skilled and passionate Senior Software Development Engineer in Test (SDET) to join our client’s team. This role is ideal for someone who thrives in a hands ...

Software Engineer London/Hybrid | Perm Role £80,000 - £100,000 Harrington Starr has partnered with a fast-growing fintech that’s transforming how businesses manage foreign exchange and treasury operations. Their technology enables clients to access institutional-grade execution, automate manual workflows, and gain greater transparency across … product offering and deliver cutting-edge solutions that help clients manage risk more effectively. The Role This is an excellent opportunity for an experienced Software Engineer — ideally with a background in financial technology or FX — to join a high-performing engineering team within a scaling fintech. ...

circularity meets automation: smarter for your team, safer for your data, and better for the planet. 🎯 The Role We’re looking for a Founding (Senior) Software Engineer to build and shape the Klyk platform from zero-to-one. This is a foundational position with significant autonomy, where … automated IT services. 🎯 Autonomy and trust Work directly with founders and influence decisions from day one. 💡 Experienced Co-Founder team Experienced Founder Team across Software Development, IT & Cyber & Business scaling 🧠 Continuous learning Get exposure to product strategy, operations, sales, cyber, AI, and the realities of building a fast-growing ...

Senior C# Engineer City of London (On-site) Permanent | £90,000 – £120,000 We’re partnered with an innovative proprietary trading firm in the City of London that is hiring a Senior C# Software Engineer . You’ll work on greenfield projects, cutting-edge technology ...

Senior C++ Software Developer, Python - Financial/Banking Candidates will have 5+ years C++ experience (ideally more) and excellent knowledge of Python - ideally coming from a Financial/Banking background with knowledge of Equities, Futures & Options and Fixed Income and Exchange Connectivity, FIX Protocol and some Low Latency … work with the Product, Infrastructure and QA teams, to produce high performance, low latency and highly reliable code. Your goal will be to develop software which handle large amount of TPS to drive a highly efficient technology used by several markets around the world. To be successful in this ...

Senior Software Engineer/Developer (LLM TypeScript Node API) London/WFH to £100k Are you a senior technologist with experience of productionising LLMs? You could be joining a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional ...

Senior Backend Engineer - £85-105k - 2 days a week in London We are partnered with a well established fintech platform that’s looking to add a Senior Backend Engineer to one of their core backend teams. This role sits within a high-impact product area … design Comfortable working in environments with real-world scale and complexity If this role sounds like it could be of interest, please apply now! Senior Backend Engineer - £85-105k - 2 days a week in London ...

Lead Software Engineer – Java Microservices | London (1 day per week on-site) | £74,000 – £92,000 + Package We’re partnering with a leading UK bank to recruit a Lead Software Engineer with strong Java and microservices expertise. This is a hands-on role building high … performance, scalable software for real-world, high-traffic systems. About the Role You’ll join a permanent feature team, taking end-to-end ownership of services, from design and development to testing, deployment, and optimisation. Your focus will be on building robust microservices that support high-traffic user experiences ...

Senior Backend Software Engineer (Python) Blockchain/Web3 Remote £50-£80k An ambitious Web3 and blockchain-focused team working to create more equitable ownership and compensation models, particularly within gaming. They collaborate closely with leading Layer 1 protocols to deliver secure, scalable infrastructure and provide global economic ...

Senior Java Engineer (Core Java) £100,000 - £130,000 Central London - Hybrid A high-growth, privately backed Enterprise SaaS company is seeking a Senior Core Java Engineer to join its London-based engineering team. The organisation builds large-scale, mission-critical platforms used by some … Contribute across design, development, testing, deployment and support Collaborate closely with other engineers to deliver customer-centric solutions Mentor and be mentored within a senior engineering team Promote best practices around code quality, testing and reliability Participate in team support and operational responsibilities Technology Environment Core Java (deep ...

Role: Senior Product Engineer (Fullstack) Salary/Package: £90k-£140k + Equity Options Company Sector: AI Start Up Experience Level: Senior (5+ years) Tech: JavaScript, TypeScript, Node.js, React.js, AWS Location: Central London Working Arrangement: 5 days a week in the office (flex hours) Product Engineer (Full … Stack) Help shape the future of human–computer interaction by building fast, delightful, intelligent products. We’re looking for a product-focused engineer who loves bringing ideas to life in a fast-moving, collaborative environment. You’ll work across the stack to design, build, and launch new features ...