1 to 25 of 106 Senior Software Engineer Jobs in the City of London

About the Role: We are seeking a highly experienced and versatile Senior Software Engineer with deep expertise across quantitative development, infrastructure engineering, and full-stack development, to join and lead a high-performance team. The ideal candidate thrives at the intersection of finance and technology, has led engineering teams, and has built and maintained robust trading systems … Collaborate with quant researchers, traders, and infrastructure teams to deliver performant solutions. Maintain and optimize trading infrastructure (low-latency systems, data pipelines, monitoring, etc.). Manage a team of software engineers, mentor junior developers, and drive best practices across the stack. Ensure high code quality through code reviews, CI/CD, test automation, and Git-based workflows. Own deployment … internal tools and external integrations. Work with data at scale (market data ingestion, real-time analytics, historical storage). Required Skills & Experience: Core Engineering: 5+ years of experience in software development, with exposure to both backend and frontend stacks. Strong programming proficiency in Python, C++, and Java (Quant/Trading grade codebases). Expertise in modern web development with More ❯

Senior Software Engineer/Developer (Full Stack JavaScript) London to £100k Opportunity to progress your career in a senior, hands-on Software Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets … established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior Software Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and … understanding of web development practices, tools and technologies You enjoy learning and picking up new things You're flexible and able to adapt to changing priorities You have full software development lifecycle experience including CI/CD and testing You're collaborative with Agile team experience, happy to mentor more junior developers You're likely to be degree educated More ❯

Exciting opportunity for a Senior .Net C# Software Engineer to join this global Energy company. This is an exciting time to join this world-leading Energy company as it evolves from a traditional Oil & Gas enterprise into a future-focused Energy leader. This transformation includes the establishment of a highly successful new Power Trading desk within the … to the success of this evolution, working alongside some of the industry’s top professionals and leveraging the very latest technology. Key Requirements – Essentials • 8+ years of hands-on software development experience, spanning front-end, back-end, and cloud automation/orchestration. • Strong proficiency in back-end development using C# and .NET Core 5/6. • Cloud-native development More ❯

Role: Senior Software Engineer Location: Remote (with occasional monthly collaboration days) Are you... A software Engineer with 5+ years experience, working with modern programming with one or more programming languages such as Python, Golang, Java, Ruby, TypeScript etc? Experienced working on cloud platform such as AWS, Google Cloud and have a good understanding of cloud … pop into the office to meet colleagues or even change if scenery when you like? About: Our client are a "Scale-Up" cloud solutions consultancy, helping customers to optimise Software & Cloud, covering DevOps, DevSecOps, Transformation, Strategy and more. Due to recent successes in the continued commercial strategy, we are now looking to grow the engineering footprint significantly to build … new teams for new customer engagements. As a Senior Software Engineer, you will have the opportunity to work across various industries and sectors. This diversity ensures that no two projects are the same, allowing you to gain valuable insights into the unique challenges faced in different domains. The Technology/Skills: As mentioned, every project is a More ❯

We’re a fast-growing, AI-first tech company transforming how visual content is created. Our innovative products power millions of creators and brands worldwide — from AI-driven video and photo tools to an influencer platform that monetizes creativity. What More ❯

Senior Software Engineer London, UK - Fully Onsite Key Technologies: Java, JavaScript, React, Docker, Kubernetes Perm Role | £80,000 - £120,000 Harrington Starr has partnered with a leading financial institution on a mission to transform investment banking through cutting-edge technology. Their Investment Banking Middle Office Technology team plays a crucial role in enabling efficient trade management with … development experience Expertise in microservices architectures (Spring Boot, Docker, Kubernetes) Strong experience with GUI technologies (React, TypeScript, HTML5) Experience in full SDLC (Git, Maven, Bamboo) Strong understanding of modern software design & architecture A proactive mindset and a collaborative approach Key Benefits: Private pension plan Up to £120,000 base salary 30 days holiday allowance Private health & life insurance Enhanced More ❯

forefront of agentic systems. What You’ll Do Design & build scalable backend services and data pipelines - written in Python and deployed with Docker & Kubernetes. Integrate with enterprise ecosystems- enterprise software systems such as SAP and Oracle ERP, GraphQL/REST APIs, SFTP feeds, and event buses (Kafka, Pulsar). Wrangle large, heterogeneous data sets —model, transform, and index multi … the stack - build lightweight front-ends when needed and pair with ML engineers on inference and evaluation pipelines. You Might Be a Great Fit if You Have strong commercial software-engineering experience, with a fluency in Python and comfortable in TypeScript/JavaScript . Have built and operated data-intensive systems (batch & streaming) in a cloud environment (AWS, GCP More ❯

Urgent! x8 Fullstack Senior Software Engineers/Tech leads Needed – UK-based – – Rapid Growth – Fully Remote 🌳 Areti Group is excited to partner with a Series funded startup poised for rapid expansion, growing by 40 heads in the next 3 months! We are urgently seeking x8 Fullstack Tech leads to join their high-performing team. This fully remote role … tech. Languages : 🌳 Ruby-on-Rails, Java, Python, C#, PHP 🌳 VueJs, Typescript/Angular/React Cloud : 🌳 Amazon Web Services (AWS) Databases : 🌳 PostgreSQL, DynamoDB Additional Tools & Frameworks : 🌳 GraphQL 🌳 REST APIs 🌳 Software Design Patterns – TDD, DDD 🌳 Agile methodologies: Scrum and Kanban Key Responsibilities : Full-Stack Development : Design, develop, and maintain complex full-stack applications across both front-end and back-end. … Cloud & Database Management : Build scalable, cloud-based solutions using AWS , PostgreSQL , and DynamoDB . API Development : Integrate RESTful APIs and GraphQL to enable smooth data flow between services. Software Design Patterns : Apply TDD (Test Driven Development) and DDD (Domain Driven Design) best practices to ensure maintainable, efficient code. DevOps & CI/CD : Use DevOps processes, including virtualization , containerization , and More ❯

Senior Full Stack Java Engineer - Java, TypeScript, AWS, MySQL, NoSql, Microservices, Machine Learning, Artificial intelligence (Hybrid - 3 days a week in the office near Notting Hill) Senior Full Stack Java Engineer :- You will be joining a fast-growing, research-driven company building an artificial intelligence using novel machine learning techniques. My client is revolutionising their industry … with a track record of building things that others have ruled out as impossible. The senior Java Full Stack engineer will join a very bright, talented team of engineers with the guidance of technologists who have help build up some of the best known technology companies today. You will have a great opportunity to work with a variety … of languages, frameworks and tools. Applicants will need a background in Java and modern JS frameworks and likely to have good AWS and Microservices experience. Core skills for the Senior Full Stack Engineer : 5yrs+ in a commercial Development role - currently in a Senior Full Stack role Solid experience of Java strong TypeScript/React (other JS Frameworks More ❯

Senior Software Engineer – Java Backend London (5 days onsite, with some ad-hoc flexibility) £85,000 – £120,000 (Permanent) TechHeads is currently seeking a Senior Software Engineer with strong Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s London team. This is a high-impact role involving the … including product and engineering groups in the US, Ireland and India, to ensure alignment and execution. Build and deploy secure, resilient APIs (REST/GraphQL) and optimise the full software development lifecycle through automation. Requirements: 7–10+ years of professional experience in software engineering, with a strong focus on Java backend development . Solid understanding of Spring Boot … CD , cloud infrastructure (AWS/GCP/Azure). Bonus: Exposure to tools like Elasticsearch/Kibana , Hadoop/HBase , OpenSearch , or VPN/proxy architectures. Strong grasp of software security principles , system performance optimisation, and infrastructure reliability. Experience working on large-scale , production-grade systems with distributed architectures. Ideal Candidate will: Bring technical vision , initiative, and a passion More ❯

London based, global trading and investment firm/fintech are now on the hunt for Senior Software Engineer to join and spearhead one of it's growing technology teams. Our client seek a senior profile to gain influence high-class technology trading teams and you will be gain market-leading exposure, both from a engineering and More ❯

platform is the core technology to Ki's success – allowing us to evolve underwriting intelligently and unlock massive scale. We're a multi-disciplined team, bringing together expertise in software and data engineering, full stack development, platform operations, algorithm research, and data science. Our squads focus on delivering high-impact features – we favour a highly iterative, analytical approach. Initially … Sample products you might be involved in building include, developer tooling, microservice orchestration systems, ML model serving infrastructure, feature serving and storage infrastructure. Principal Accountabilities: Build robust and scalable software for business critical, web-based applications Design, build, test, document and maintain API’s and integrations Ensure quality control using industry standard techniques such as automated testing, pairing, and … expert for one or more of Ki’s core technologies Mentor and coach colleagues in both engineering and business domain subjects Required Skills and Experience: Experience as a mid-senior level engineer working across a modern stack Strong software engineering principles (SOLID, DRY, data modelling) Professional experience with a server-side language, ideally Python Comfortable working with More ❯

and micro-services. Cloud-native technologies: Experience in developing and deploying in cloud platforms (e.g., AWS, GCP or Azure), an understanding of containerisation (e.g., Docker) and infrastructure-as-code software (e.g., Terraform). Algorithms and data structures: Excellent understanding of core CS fundamentals, including common abstract data structures and algorithms with the ability to apply them to optimise production … experience: Experience with a startup work environment and wider ecosystem. Why join us? Work in an environment conducting cutting-edge research in AI. An official role title of “Founding Engineer” - make an impact on day one. Competitive salary, equity and benefits package. 28 days + public holidays allowance. Opportunities for professional growth and progression with your career. Work on More ❯

Backend Founding Engineer: We're helping a brand-new, well-funded fintech company find their first Backend Engineers . They're building a 24/7 exchange that's set to change how we trade traditional financial stuff – think US stocks, commodities, and currencies, with big leverage options. Their main goal? Make trading super easy, direct, and fair for … startup; it's a chance to join a team from places like Citadel and Tower Research who are genuinely trying to reinvent a huge industry. As a Founding Backend Engineer , you'll design, build, and own the systems that will soon handle billions of dollars in trades every single day . This is a rare opportunity to work with More ❯

I’m supporting a FinTech AI Product Company who are on the hunt for an experienced Senior Software Engineer to join their FULLY REMOTE engineering team! This is a seriously tech-driven product company that puts a huge emphasis on engineering excellence , innovation , and building something that genuinely helps users . They’re solving complex problems in … the FinTech + AI space, and as a Senior Software Engineer, you’ll play a key role in shaping the product and the tech behind it. You’ll work closely with the CTO and be deeply involved in: Defining architecture and making key technical decisions Leading on project delivery and mentoring other engineers Building greenfield features that … Scala , etc - Even more for code examples! Proven ability to lead projects (and teams) in fast-paced, innovative environments Strong decision-making skills and a passion for building great software Experience in FinTech or AI is a HUGE plus The Culture: They live and breathe technology and engineering excellence Agile, innovative, and always pushing boundaries Remote-first — always have More ❯

I’m supporting a FinTech AI Product Company who are on the hunt for an experienced Senior Software Engineer to join their FULLY REMOTE engineering team! This is a seriously tech-driven product company that puts a huge emphasis on engineering excellence , innovation , and building something that genuinely helps users . They’re solving complex problems in … the FinTech + AI space, and as a Senior Software Engineer, you’ll play a key role in shaping the product and the tech behind it. You’ll work closely with the CTO and be deeply involved in: Defining architecture and making key technical decisions Leading on project delivery and mentoring other engineers Building greenfield features that … Scala , etc - Even more for code examples! Proven ability to lead projects (and teams) in fast-paced, innovative environments Strong decision-making skills and a passion for building great software Experience in FinTech or AI is a HUGE plus The Culture: They live and breathe technology and engineering excellence Agile, innovative, and always pushing boundaries Remote-first — always have More ❯

Senior Full Stack Engineer | React | Node | TypeScript | £95k | Hybrid London La Fosse has partnered with a leading credit card company that helps customers make smarter financial decisions. As they continue to grow, they are looking for a Senior Full Stack Engineer with a strong JavaScript background to join their team. What we're Looking For: Experience … We've streamlined our process with a quick 3-stage virtual interview. If you're interested in the position and feel you meet some of the requirements, apply now! Senior Full Stack Engineer | React | Node | TypeScript | £95k | Hybrid London More ❯

TypeScript/JavaScript - Software Engineer Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, React, NextJS, TypeScript, Cloud Tech, Terraform, AWS. Harrington Starr has partnered with an innovative Digital Currency Investment Platform Company that specialise in developing unique software systems for clients for invest into Digital Markets from Pensions, Investments and Fund Management. This is an exciting … ecosystem. This organisation are developing cutting edge web-systems, which are being used globally and are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced TypeScript Software Engineer with NodeJS, JavaScript, TypeScript and NodeJS and including cloud technologies mainly AWS and Terraform You … in Computer Science - Required A leader within their community and a specialist Development team already in place, due to recent success they are looking to further build out their Software Engineering team in their London Office. You will be working on cutting edge platforms for Trading and analytics for Digital Investments. If you feel you are ready to take More ❯

Senior Software Engineer – AI Innovation Lab £110-125,000 + Strong bonus and benefits package. London, hybrid working. We’re partnering exclusively with a leading global SaaS Scaleup business as they continue to build out a newly established Innovation lab, a dedicated team focused on applying AI and machine learning to solve valuable business problems across the … organisation. This is a hands-on Software Engineering role, part of a growing team, where you’ll work closely with stakeholders across the business to reimagine their systems using modern tools and cloud-native architecture. You’ll be building from the ground up in a greenfield environment, using technologies like Python, TypeScript, FastAPI, AWS and some Azure while contributing More ❯

a global impact, and ready to excel in a dynamic, high-energy environment. Join our team and help shape the future of AI. 🌎 Location and Legalities This full-time Senior Software Engineer position is based onsite in our brand-new Ultralytics office in London, UK, with a hybrid model of 3 days in-office and 2 days … remote. Applicants must have legal authorization to work in the UK, as Ultralytics does not provide visa sponsorship. 🚀 What You'll Do As a Senior Software Engineer at Ultralytics, you will be a key player in designing, developing, and scaling the Ultralytics HUB, our end-to-end platform for AI model development. Key responsibilities include: Designing and … will be essential in supporting Ultralytics' mission of delivering top-tier machine learning tools and models to the community. 🛠️ Skills and Experience 5+ years of experience in full-stack software engineering. Expertise in Python and experience with web frameworks like FastAPI or Django. Proficiency in modern frontend development using TypeScript and frameworks such as Nuxt.js , Vue.js, or React. Strong More ❯

We're seeking an experienced Software Engineer to join a dynamic FinTech company revolutionizing the way businesses access finance. As a key member of our team, you'll develop cutting-edge technology that empowers businesses and contributes to a more inclusive financial ecosystem. We are all about leveling up the playing field 😊👌 📌Looking for: BE Engineer (Python … Full-Stack Engineer (BE Leaning with Python) 📍Office in London, but happy to be flexible on site but ideally 1/week Why Join Us? 🎉 Make a real impact: Contribute to a mission-driven company that's empowering businesses and shaping the future of finance. Grow your career: Join a high-growth environment with opportunities for professional development and More ❯

The Role Trayport is actively looking for a Senior Software Developer to join our team for the design and development of our flagship data analytics platform where you will contribute to System Architecture, aid colleagues to help coordinate our projects and review code too. Our platform ingests hundreds of millions of data points every day and provides our … price movements. We process real-time market data feeds that together add hundreds of millions of data points to our dataset every day. We encourage ownership across the entire software lifecycle, and will value your input on each stage. We take an iterative approach to solve problems and continually improve our product. If you are interested in building customer … facing products and approaching it using lean software development practices, we would love to hear from you. Responsibilities Contribute to System Architecture, Aid colleagues to help coordinate our projects Peer review code The Person Strong working knowledge of C# or Kotlin Experience writing efficient, concurrent .NET code Experience working on distributed systems Strong knowledge of Kubernetes and Kafka Experience More ❯

Senior C# Developer - Fixed Income Key Technologies: C#, .NET, .NET Core, Azure, SQL London Perm Role | Hybrid Working Structure £80,000 - £110,000 Harrington Starr has partnered with a global Investment Bank who are looking to hire a seasoned Senior C# Developer with extensive experience developing Front Office trading systems - specifically Fixed Income . Key Responsibilities: Design, develop More ❯

onsite in London ❌ No sponsorship available A London based FinTech that is the trusted partner to the world’s leading private banks and asset managers are looking for several Senior TypeScript Engineers was a passion for delivering exceptional customer experiences and technology implementations, to work on their proprietary platform. Their team draws on an award-winning legacy in investment … or STEM education Strong experience with React, TypeScript, HTML, CSS and web technologies Strong with backend TypeScript, e.g. Node JS, Nest JS and Express. Commitment to maintaining high quality software through the use of automated testing tools such as Jest and Cypress/Playwright Experience with Azure DevOps is a plus. Agile, Git and version control A pragmatic, right More ❯

We are seeking a skilled and motivated Full Stack TypeScript Developer with a product-focused mindset to join our team. The ideal candidate will have a strong foundation in software development, leadership experience/potential, experience with modern frameworks and libraries, and a passion for building scalable, high-quality applications. This role involves working across the entire stack, from More ❯