76 to 100 of 113 Senior Software Engineer Jobs in the City of London

Senior & Lead Java Engineers - London & Hybrid Java 21, Springboot, Microservices, TDD Sometimes the simplest ideas are born from everyday struggles. In regions where inflation is soaring, people have long worried about their savings losing value overnight. Out of that challenge came a new kind of e‐wallet, one that … promises; it’s about peace of mind and a fair chance to participate in the global economy while protecting income. As a Senior Java Engineer, you’ll play a key role in building this out and maintaining the backend infrastructure. You’ll work with Java 21+, designing APIs ...

seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent … with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield ...

Founding Software Engineer| DeepTech | On-site London | Up-To £180,000 + Equity A well-funded, early-stage AI infrastructure startup is tackling one of the most persistent bottlenecks in the physical world. The team is building the core AI systems that will enable the next wave … real-world, AI-driven innovation. They’re looking for a founding engineer who thrives on ownership, moves fast, and wants to help shape both the product and the company from day one. This is a hands-on role in a small, highly technical team where you’ll ship early ...

Senior Product Engineer - London | Full-time | Hybrid Are you ready to build technology that makes a real-world impact? Join a fast-growing, mission-driven tech company tackling complex social challenges with cutting-edge AI and a passionate team. About the Role: We’re looking for experienced product … with Ruby on Rails, Turbo, AlpineJS, TailwindCSS, AWS, PostgreSQL Experience integrating with LLMs like OpenAI and Claude Strong understanding of scalable architecture and pragmatic software design Comfortable working in cross-functional teams with PMs, UX, and data specialists A product-first mindset with a focus on customer outcomes Passion ...

Senior Java Backend Engineer Location: Hybrid – London Job Type: Permanent | Full-Time Salary: £80,000 – £95,000 + Benefits We’re supporting a fast-scaling UK digital banking platform as they continue strengthening the systems that power millions of daily transactions. They’re now looking for a Senior Backend Engineer with strong Java engineering experience and a passion for building reliable, distributed systems at scale. This role is ideal for someone who enjoys working on event-driven, distributed architectures, values thoughtful system design, and wants to deliver high-impact backend work at scale. Key Responsibilities Design ...

Company | HealthTech (B2B2C) 📏 Size | ~10 people 🌱 Stage | Pre-Seed > Seed 🧢 Role | Software Engineer 🪜 Level | Mid–Senior ✨ Tech | Python, TypeScript, FastAPI, React, Cloud infrastructure, AI/LLMs 🎯 Areas | agentic AI, real-time systems, product development 📍 Based | Central London, near Farringdon 💻 Working | in-office 💰 Offer | £100–120k + meaningful … help define how AI is responsibly deployed in high-stakes environments. You’ll help: collaborate closely with users, translating real-world needs into reliable software work on real-time data flows, async systems, and distributed architectures build and evolve agentic AI systems used in live, production settings contribute ...

future where human well-being is safeguarded while closing the gaps in critical global labour needs. About The Role We are looking for a Senior/Staff Software Engineer (Data) to help transform our rapidly growing universe of raw robotic data into a dependable, scalable foundation … maintaining the data pipelines that connect control, perception, simulation, and learning systems. This role involves close collaboration with robotics engineers, machine learning researchers, and software developers. You will own critical aspects of our data platform, shape data models and schema design, implement quality controls, and optimise systems for high ...

Senior Developer – London 2 days a week/3 days remote | Software Engineering A growing tech organisation is looking for a Senior Developer to join its Software Engineering team in London. This is a great opportunity for a hands-on technologist who enjoys solving complex problems … working on large-scale enterprise systems, and delivering high-quality software solutions. In this role, you’ll contribute to technical design, end-to-end development, and delivery of enhancements across a suite of core enterprise products. You’ll work closely with architects, project managers, and cross-functional teams, while ...

Senior Front Office Software Engineer – Python - Commodities Trading Orbis are partnering with a global Energy Trading firm on the build out of a new greenfield trading desk. As part of this exciting new development, they’re looking for the first Senior Front Office Python Developer ...

based in Hammersmith are building cutting-edge products that will transform how teams work with intelligent technology are looking for a talented Full Stack Software Engineer to join a small, high-impact team. What you’ll do Design, build, and ship features across their AI-powered product suite … What we’re looking for Strong commercial experience in Golang Solid knowledge of TypeScript and React for frontend development Experience working across the full software lifecycle Self-driven, curious, and excited by technical challenges Bonus points Experience with Kubernetes , containerisation, and cloud infrastructure Background in distributed systems, real-time ...

client is looking for an experienced Senior C++ Software Engineer to help grow and enhance our PTP software platform. The candidate will work on strategic enhancements to the platform as well as on client implementation projects. The PTP Platform is a leading-edge, cloud-based Securities … Processing solution that provides trade lifecycle processing for a wide range of global financial institutions. What you will need: · Extensive commercial software development experience using C++ · SQL experience · Unix/Linux experience · Relevant degree in a numeric discipline, or equivalent work experience · Excellent written and spoken English Added bonus ...

Senior Full Stack Engineers! We're looking for someone to lead high-impact backend projects for a rapidly scaling consumer platform. In this role, you’ll own complex systems work such as CMS and service redesigns, third-party integrations, and GPT-powered personalisation. You’ll collaborate closely with Product ...

growth of the platform, exercising an eye for detail across all aspects of the development lifecycle while maintaining organization and good code hygiene. This engineer should be able to effectively communicate both with internal teams and with clients. The successful candidate will help Glint continue to grow, exercising … detail across all aspects of the development lifecycle while maintaining organization and good code hygiene. This Senior Engineer should be able to effectively communicate both with internal teams and with clients. The successful candidate values teamwork and collaboration, as well as continuous learning and application of new technologies ...

Senior Java Developer - Java, Springboot & AWS – paying up to £650/day (Inside IR35) – Hybrid (2x a week - London) – 6 month contract Our client is seeking a Senior Java Developer who is passionate about clean code, cloud-native systems, and building technology that makes a real impact. This ...

Senior Java Developer – London (Hybrid: 2 Days Onsite) We’re partnering with a leading global organisation that is scaling its engineering function and looking for a Senior Java Developer to join their London team. If you’re passionate about building data-driven platforms, enjoy solving complex challenges ...

Role : Senior .Net Developer Comp: £65,000-£75,000 Location : Central London (On-site). About the Role: As a Senior .NET Developer, you’ll play a key role in designing, developing, and maintaining software applications. You’ll collaborate closely with cross-functional teams to translate user ...

seeking an experienced and highly motivated Senior Full Stack Engineer (Node.js/React.js) to join our growing technology team. This role offers the opportunity to contribute to the design and development of a global, high-traffic eCommerce platform that processes thousands of transactions daily. As a key member … user experiences. Support continuous improvement initiatives through the adoption of new technologies and best practices. Skills and Experience Demonstrated experience as a Full Stack Engineer or in a similar role. Advanced proficiency in React, Node.js, JavaScript/TypeScript, HTML, and CSS. Strong understanding of back-end technologies, databases ...

fast-scaling health-tech company building AI tools used daily by clinicians across the UK, Ireland and the US. They’re hiring a Senior Backend Engineer to design and scale the systems that power their AI knowledge platform. What you’ll do: Build and maintain cloud-first backend ...

Fullstack Elixir Engineer London, UK (Hybrid – 1 day per week on-site) Contract (£500-650 outside) About the Role Join a fast-growing AI technology firm in London as an Elixir Engineer , building large-scale, data-driven systems that power intelligent automation and machine learning. You’ll work ...

Founding Back End Engineer - Redefine Finance with a Stealth-Mode Innovator (London) Are you an exceptional Back End Engineer with a stellar academic pedigree and a proven track record in architecting high-performance, low-latency platforms? Cornucopia is collaborating with a well-capitalised fintech poised to disrupt global … financial markets. This is a rare opportunity to help engineer the next chapter of finance. Our client, well-backed financially and helmed by founders with formidable industry credentials, is building a cutting-edge platform enabling 24/7, high-leverage trading in traditional financial assets. Their vision ...

Senior Python Developer - Python, Flask, Django, SQL, AWS OB have partnered with a FinTech company, who are looking to bring on a Senior Python Developer to their highly skilled engineering team, where you'll have the opportunity to work closely with the CTO & Head of Engineering to have … role, you'll design highly complex systems and applications, writing high-quality and scalable code, to optimise the performance of their Python based applications. Senior Python Developer - Python, Flask, Django, SQL, AWS Required skills and experience: 6+ years of commercial experience using Python Highly skilled with Python Experience with ...

C# skilled Software Engineer/Quant Developer, you'll work closely with portfolio managers, researchers, and data scientists to build and maintain the systems that drive our alpha-generating strategies. You’ll contribute to every part of the investment pipeline—from research tooling and data infrastructure to real … Ensure robustness and scalability in both real-time and batch environments What We’re Looking For: Strong programming experience with C# Solid understanding of software engineering principles, design patterns, and performance tuning Experience in financial markets (equities, futures, FX, etc.) is a plus, but not required Familiarity with data ...

leading systematic investment firm is expanding its Post-Trade Engineering function and is hiring a highly capable Full-Stack Software Engineer to build mission-critical reporting, investor-facing, and post-trade systems. This is an exceptional opportunity to work in a small, high-calibre engineering team where your … automated pipelines Clean architectural patterns, maintainability, correctness Close collaboration with stakeholders; engineers frequently shape product direction What They’re Looking For Core Requirements: Strong software engineering fundamentals (data structures, OO design, distributed systems concepts) Professional experience in C#/.NET Hands-on Angular experience OR strong React/TypeScript ...

goal. To support you to do your best work we also offer you the latest tech, generous leave and flexible working options. As a Senior we would expect you to; * Mentor Engineers * Keep the problem front and centre, and champion our principles * Contribute to the evolving standards across ...

Java Engineer – 6-Month Contract – Hybrid (2 days on site, London) - Day Rate: Up to £700 (Inside IR35) Join a high-performing engineering team working on large-scale, high-availability systems used by millions. This role offers the chance to build and enhance complex backend services in a modern … microservice architecture. Proven background working in cloud environments (ideally AWS). Familiarity with CI/CD pipelines and automation tools. Solid grasp of software testing, TDD, and Agile methodologies. Good communication skills and the ability to work collaboratively in a hybrid setup. If you’re an experienced Java Engineer ...