1 to 25 of 204 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 ❯

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 ❯

Role: Senior Software Engineer , Data Solutions Location: Hybrid (2 days on-site in Central London) Salary: £70,000 to £80,000 + Excellent Benefits Candidates must be eligible for UK Security Clearance The Opportunity We are proud to be working in partnership with a major defence systems integrator to recruit a Senior Software Engineer … solutions in a secure and complex data landscape—an ideal environment for those who want to develop cutting-edge systems and contribute to national resilience. The Role As a Senior Software Engineer, you will play a pivotal role in the design, development, and operation of innovative front-end solutions that interface with enterprise-scale data ecosystems. Working … to project planning, risk assessment, and mitigation strategies. Mentoring junior engineers and helping to shape development standards and tools. The Person We're looking for a proactive and collaborative software engineer who thrives in agile, multi-disciplinary teams and enjoys the challenges of working in secure, data-rich environments. To succeed in this role, you’ll bring: Strong 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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

Senior Full Stack Developer London (Hybrid – 2 to 3 days per week in the office) Up to £80,000 + 10% Bonus + Benefits We are hiring on behalf of our client – a tech-driven, award-winning global company headquartered in London and currently experiencing sustained growth. This is a fantastic opportunity to join a well-established business and … play a pivotal role in the ongoing development of a critical part of their ecommerce platform. As a Senior Full Stack Developer, you will be part of a cross-functional team including Back End and Front End Engineers, DevOps, Product Managers, and UX Designers. You will design and implement end-to-end solutions, ensuring performance, scalability, and maintainability across More ❯

Senior Full Stack Developer London (Hybrid – 2 to 3 days per week in the office) Up to £80,000 + 10% Bonus + Benefits We are hiring on behalf of our client – a tech-driven, award-winning global company headquartered in London and currently experiencing sustained growth. This is a fantastic opportunity to join a well-established business and … play a pivotal role in the ongoing development of a critical part of their ecommerce platform. As a Senior Full Stack Developer, you will be part of a cross-functional team including Back End and Front End Engineers, DevOps, Product Managers, and UX Designers. You will design and implement end-to-end solutions, ensuring performance, scalability, and maintainability across 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 ❯

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 ❯