senior software engineer- java jobs in London

We are seeking an expert Senior Low-Latency Java Engineer to join our team. Responsibilities Latency Optimization: Profile, analyze, and systematically eliminate long-tail latency spikes across the FX eTrading application pipeline. Zero-GC Engineering: Design, write, and refactor high-throughput core Java code utilizing zero-allocation and low-GC...

Solirius Reply, part of the Reply Group, is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery. We embed into client teams to understand goals and translate them into effective outcomes while delivering secure, accessible, user-focused services.You...

Bullish, Inc. is seeking a Senior Engineer for Trading Product Engineering in London. You will design and deliver low-latency Java code powering the Bullish Exchange, working across a hybrid architecture that blends a Central Limit Order Book with proprietary market making.You will optimize performance, expand automated testing, and collaborate with...

DescriptionAt Engine by Starling, we are on a mission to find and work with leading banks all around the world who have the ambition to build rapid growth businesses, on our technology. Engine is Starling's software-as-a-service (SaaS) business, the technology that was built to power Starling, and two years ago we split out as a separate business. Starling...

Senior Software EngineerLocation: London, UK (Canary Wharf) Duration: Sep 2026 – June 2027 On-site Expectation: Up to 5 days per week in officeBrief about the Team & Fractal: Fractal Analytics is Leading Fortune 500 companies leverage Big Data, analytics, and technology to drive smarter, faster and more accurate decisions in every aspect of their business....

OverviewMinute Media is a global technology and content company built for the future of sports consumption. Minute Media's proprietary technology platform enables the creation, distribution and monetization of digital content experiences, which powers Minute Media's portfolio of trusted content brands, including Sports Illustrated, The Players' Tribune, and...

About us One team. Global challenges. Infinite opportunities. At Viasat, we’re on a mission to deliver connections with the capacity to change the world. For more than 35 years, Viasat has helped shape how consumers, businesses, governments and militaries around the globe communicate. We’re looking for people who think big, act fearlessly, and create an...

OverviewG MASS are currently looking for an experienced Software Engineer to join a leading Investment Manager client on an initial 6-month engagement. This role sits within a core engineering team at the centre of a highly quantitative investment environment, supporting the technology and data platforms that underpin systematic trading strategies and...

Are you passionate about building high-quality software solutions that solve complex customer challenges? Do you enjoy mentoring others, driving technical excellence, and collaborating across teams to deliver impactful products?About our TeamOur team is a Shared Services team that provides API Platform capabilities to all of Elsevier. API teams can onboard...

Software Engineer - AI/TypeScript/RustLocation: Hoxton, London - five days per week in the office.We're partnering with an AI startup building software to help businesses make better financial and strategic decisions. Their first product brings AI agents into Excel, helping users build and work with complex financial models.They're looking for a Software...

Careers that change lives start here. Medtronic is a global leader in healthcare technology with a Mission to alleviate pain, restore health, and extend life. Our 95,000 employees work across more than 150 countries to put patients first — developing innovative medical technologies that improve the lives of 72+ million patients each year. Your unique...

Senior Software Engineer Due to the interesting work we do and the sector this team is working in, we require all candidates to hold an active eDV clearance for this role. Date Posted: 2026-09-24 Country: United Kingdom Location: London, London, City of Position Role Type: Onsite Location: London Contract: Permanent Employment Type: Onsite About Us At...

Who are we? At Finastra, we’re a global leader in financial services software, dedicated to expanding access to financial services and shaping what’s next for the industry. Our technology powers mission-critical solutions across Lending, Payments and Universal Banking, supporting over 7,000 customers, including 80% of the world’s top 50 banks, in more...

The Senior Software Engineer will be a key member of the Systems and Software team within the Programmes area at STS Defence, playing an active role in designing, developing, and maintaining software across the full Software Development Lifecycle; from requirements elicitation through to in-service delivery.The post will provide technical leadership on...

Catapult is building the future of sports performance technology, with a mission to Unleash the Potential of every athlete and team on earth. We don't just work in the sporting industry; we are actively changing it. Since 2006, our solutions have been leading the way in sports performance software, science, and data, in a world where 1% can literally mean...

Salary: £65,000 - 105,000 per year Requirements: We are looking for someone who enjoys working in an energetic and dynamic environment.We need someone who is competent and comfortable working with TypeScript and serverless technologies.We require extensive experience working with AWS, including API Gateway, Lambda, DynamoDB, SQS, Kinesis, S3, and ELK.We...

At Gigs, we're building the operating system for mobile services—a platform that lets tech companies embed global connectivity into their products effortlessly. Just as Stripe lets any business add a payment button in seconds, Gigs empowers platforms to weave in connectivity—bridging the traditional world of telecom with modern tech. From fintechs...

Senior Software Engineer | AI, Artificial Intelligence 1 day ago Be among the first 25 applicants This range is provided by Digital Waffle. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range Hybrid role in Soho £80-120k depending on experience Direct message the job poster from Digital...

About Centric Software Centric Software® is a global leader, providing an innovative and AI-enabled product-concept-to-commercialization platform for retailers, brands and manufacturers of all sizes. We equip retail, fashion, luxury, footwear, outdoor, home and consumer goods brands with pioneering best‑of‑breed solutions to plan, design, develop,...

About our TeamOur team is a Shared Services team that provides API Platform capabilities to all of Elsevier. API teams can onboard APIs, manage their lifecycles and monitor usage. For public APIs, customers can create credentials through the self-service developer portal. The Platform also offers AI Gateways, enabling API teams to onboard MCP servers and...