54 software engineer jobs found in London

Senior Software Engineer - Golang - Go - Product - TDD – paying up to £550 (Outside IR35) – Hybrid – 3 months We’re a mission-driven tech company that builds products to help people make confident decisions about their finances and everyday services. They are looking for a strong Go Developer who is excited about working with new technologies. Essential Skills: Strong commercial experience with Golang Must have a Product first mentality Experience with observability would be great Experience configuring, deploying, and monitoring applications on AWS. TDD (Test-Driven Development) experience. API build experience is essential, especially with 3rd party API's Comfortable working with relational and NoSQL databases, including complex queries and performance optimization. Solid understanding of web design patterns, including SOLID principles. Experience working in an agile, collaborative environment. Familiarity with automated testing and CI/CD pipelines....

Lead Software Engineer (Backend) JavaScript/TypeScript, AWS, Kafka Outside IR35 Contract My London based client is urgently looking for an experienced Lead Software Engineer with a strong Back End focus to lead the build and evolution of scalable, cloud-native services. You'll set technical direction, mentor engineers, and stay hands-on delivering production code. What you'll do: Lead Back End design and development (Node.js, TypeScript/JavaScript) Build and operate event-driven microservices using Kafka Own AWS-based delivery (scalability, performance, reliability, security) Drive engineering standards: code reviews, testing strategy, CI/CD, observability Partner with Product/Architecture to translate requirements into robust solutions Key skills: Strong commercial Back End experience with JavaScript/TypeScript (Node.js) Kafka experience (event-driven systems, distributed messaging) Strong AWS experience across modern cloud services Microservices/distributed...

Software Engineer - Golang - Go - Product - TDD - £520/£550 (Outside IR35) - Hybrid - 3 months - Immediate Starter Paying up to £550 per day (Outside IR35) We're a mission-driven tech company that builds products to help people make confident decisions about their finances and everyday services. They are looking for a strong Go Developer who is excited about working with new technologies. Essential Skills: Strong commercial experience with Golang Must have a Product first mentality Experience with observability would be great Experience configuring, deploying, and monitoring applications on AWS. TDD (Test-Driven Development) experience. API build experience is essential, especially with 3rd party API's Comfortable working with relational and NoSQL databases, including complex queries and performance optimization. Solid understanding of web design patterns, including SOLID principles. Experience working in an agile, collaborative environment. Familiarity with...

Software Engineer - Golang - Go - Product - TDD - £520/£550 (Outside IR35) - Hybrid - 3 months - Immediate Starter Paying up to £550 per day (Outside IR35) We're a mission-driven tech company that builds products to help people make confident decisions about their finances and everyday services. They are looking for a strong Go Developer who is excited about working with new technologies. Essential Skills: Strong commercial experience with Golang Must have a Product first mentality Experience with observability would be great Experience configuring, deploying, and monitoring applications on AWS. TDD (Test-Driven Development) experience. API build experience is essential, especially with 3rd party API's Comfortable working with relational and NoSQL databases, including complex queries and performance optimization. Solid understanding of web design patterns, including SOLID principles. Experience working in an agile, collaborative environment. Familiarity with...

?? Senior Software Engineer (Generative AI Platform) - 6-Month Contract - £650/day (Outside IR35) Location: Europe (Remote-first) Rate: £650/day Duration: 6 months (high likelihood of extension) A cutting-edge engineering team is building a next-generation GenAI platform that empowers autonomous software-engineering agents and fully agentic workflows - and they 're looking for exceptional engineers to join them. If you want to work at the forefront of AI , in a space evolving daily, and help define how engineering teams across the world write and ship code in the future ... this is the contract for you. ?? What You 'll Be Working On Designing and developing Go (Golang) services powering a scalable GenAI engineering platform. Building autonomous AI software-engineering agents capable of coding, reasoning, and executing tasks end-to-end. Developing agentic workflows that enable multi-step planning,...

?? Senior Software Engineer (Generative AI Platform) - 6-Month Contract - £650/day (Outside IR35) Location: UK or Europe (Europe preferred - remote-friendly) Rate: £650/day Duration: 6 months (strong extension potential) A high-performance engineering group is building a next-generation Generative AI platform designed to enable autonomous software-engineering agents and fully agentic workflows . This is a rare opportunity to operate at the frontier of AI-for-coding , working with emerging tools and shaping what engineering will look like in the next decade. If you 're excited by LLM-powered development, agentic reasoning, and building new systems in Go - this is your contract. ?? What You 'll Be Working On Engineering Go (Golang) services forming the core of a large-scale GenAI developer platform. Building autonomous AI agents that write, review, debug, and execute code in real time. Developing...

CONTRACT SENIOR SOFTWARE ENGINEER - eDV CLEARED NEW CONTRACT JOB OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY COMPANY FOR A SENIOR SOFTWARE ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Senior Software Engineer Globally leading defence / cyber security company £500 - £750 per day (inside and outside IR35 roles available) London based organisation in an easily accessible location Contract Senior Software Engineer To apply please call or email WHO WE ARE? We are recruiting multiple contract Senior Software Engineers to work with various clients in London ranging from R &D companies, Multi-National Consultancies to SME 's and product based companies. Due to the nature of the work these clients do, you must hold enhanced DV Security Clearance. WHAT WILL THE SENIOR SOFTWARE ENGINEER BE DOING? As a Senior Software Engineer, you will work with an experienced agile team to design and deliver...

A leading corporate finance and advisory organisation is seeking an experienced Python Software Engineer to join its growing Technology & Innovation team on a contract basis. This role will focus on building scalable Python-based systems, data platforms and backend services , supporting the continued development of the firm's cloud-based technology stack and client-facing digital products. You will work closely with engineers, data specialists and business stakeholders to deliver robust, production-grade software that improves automation, data capabilities and operational efficiency across the organisation. Responsibilities Design and develop high-quality Python applications and services Build and maintain data pipelines, APIs and backend systems Contribute to the development of a cloud-based data and analytics platform Implement scalable, maintainable and well-tested code Support the development of automation tools to improve operational...

A leading corporate finance and advisory organisation is seeking an experienced Python Software Engineer to join its growing Technology & Innovation team on a contract basis. This role will focus on building scalable Python-based systems, data platforms and Back End services , supporting the continued development of the firm's cloud-based technology stack and client-facing digital products. You will work closely with engineers, data specialists and business stakeholders to deliver robust, production-grade software that improves automation, data capabilities and operational efficiency across the organisation. Responsibilities Design and develop high-quality Python applications and services Build and maintain data pipelines, APIs and Back End systems Contribute to the development of a cloud-based data and analytics platform Implement scalable, maintainable and well-tested code Support the development of automation tools to improve operational...

Senior Software Engineer (Generative AI Platform) - 6-Month Contract - £650/day (Outside IR35) Location: Europe (Remote-first) Rate: £650/day Duration: 6 months (high likelihood of extension) A cutting-edge engineering team is building a next-generation GenAI platform that empowers autonomous software-engineering agents and fully agentic workflows - and they're looking for exceptional engineers to join them. If you want to work at the forefront of AI , in a space evolving daily, and help define how engineering teams across the world write and ship code in the future this is the contract for you. What You'll Be Working On Designing and developing Go (Golang) services powering a scalable GenAI engineering platform. Building autonomous AI software-engineering agents capable of coding, reasoning, and executing tasks end-to-end. Developing agentic workflows that enable multi-step planning, orchestration, evaluation, and self-improvement. Working in environments...

Location: Tring (Predominately onsite with flex where project allows) Duration: 4-6 month contract IR35: Outside IR35 Role detaills: Our client, a leading entity in the Defence & Security sector, is seeking a highly motivated Senior Software Engineer to join them on a contract basis - The role will encompass the design and development of a web-based control and monitoring dashboard application for an antenna terminal system. Key Responsibilities: Design and develop a web-based control and monitoring dashboard application for an antenna terminal system. Engage in the full design life cycle from specifications generation to thorough regression testing of pre-production units. Build and maintain React/Next.js frontend applications and NestJS backend services within a shared pnpm monorepo environment. Integrate user-facing components with backend services using various communication protocols (REST, WebSockets, SNMP, MQTT, etc.). Develop the GUI using a mix of...

PLC Software Engineer Location: Heybridge, Essex, Full time on site Duration: 18 months Rate negotiable on application Outside IR35 Job description The implementor should have a fundamental knowledge in programming with Codesys as well as in all corresponding programming languages eg Structured text click apply for full job details

PLC Software Engineer Location: Heybridge, Essex, Full time on site Duration: 18 months Rate negotiable on application Outside IR35 Job description The implementor should have a fundamental knowledge in programming with Codesys as well as in all corresponding programming languages eg Structured text click apply for full job details

Outside IR35 Contract - Senior/Lead Kotlin Engineer – Backend / Distributed Systems - £700-800/day Tier-One Global Investment Bank | London A tier-one global investment bank is expanding a new engineering group responsible for building modern digital financial platforms from the ground up. This team operates with the autonomy and pace of a start-up, backed by the scale and resources of one of the world’s largest financial institutions. Engineers work in small, highly collaborative teams designing and operating systems that power critical financial services used by millions of customers. This is a 6-month rolling contract, on a programme of work estimated to last 2-3 years. We’re looking for experienced Senior and Lead backend engineers who specialise in server-side Kotlin on the JVM , with a strong interest in building reliable distributed systems and scalable cloud platforms. You’ll help design and build high-performance backend services, working closely...

Outside IR35 Contract - Senior/Lead Kotlin Engineer – Backend / Distributed Systems - £700-800/day Tier-One Global Investment Bank | London A tier-one global investment bank is expanding a new engineering group responsible for building modern digital financial platforms from the ground up. This team operates with the autonomy and pace of a start-up, backed by the scale and resources of one of the world’s largest financial institutions. Engineers work in small, highly collaborative teams designing and operating systems that power critical financial services used by millions of customers. This is a 6-month rolling contract, on a programme of work estimated to last 2-3 years. We’re looking for experienced Senior and Lead backend engineers who specialise in server-side Kotlin on the JVM , with a strong interest in building reliable distributed systems and scalable cloud platforms. You’ll help design and build high-performance backend services, working closely...

AI Platform Engineer - Remote - Outside IR35 - Python/Typescript or similar - AWS - Terraform or CDK - CI/CD. We have an urgent need for a Platform Engineer on a 9 month contract. With this role it's essential that you have a strong software engineering background and understand best practices .You will have strong experience in cloud infrastructure and a passion for AI-powered automation click apply for full job details

Full Stack Developer (React / TypeScript / Java) Location: London (1–2 days onsite per month) Contract: Outside IR35 Rate: £650–£700 per day Duration: 12 Month Contract Start: Immediate / Short Notice Preferred Eligibility: Active SC Clearance required (DV clearance ideally) Overview An experienced Full Stack Developer is required to build and maintain scalable, high-performance applications within a secure public sector environment. The role requires a 50/50 split across front-end and back-end development . Requirements Strong experience with React and TypeScript Solid Java back-end development experience Experience working in a full stack capacity (approx. 50/50 front-end/back-end) Strong understanding of API integration and system design Active SC Clearance required (DV clearance ideally)

Job Summary: Front Office C# Risk & Valuations Developer (Outside IR35) Role : Senior C# Risk & Valutaions Developer Location : Remote (with occasional travel to London City) Rate : Upto £800 per day IR35 Status : Outside IR35 Duration : 12 months + Responsibilities : Develop and enhance Front Office (FO) risk and P&L functionality in a core risk system. Investigate risk and P&L issues raised by users. Collaborate with the quant group and FO users to gather requirements. Produce user and technical documentation. Ensure system stability and supportability. Essential Skills : Very strong C# development, including very strong multi-threading. Proficiency in SQL Server. Good knowledge of derivatives pricing across asset classes. Understanding of risk management and Greeks. Experience with distributed systems. Strong mathematical background. Familiarity with complex Excel pricing sheets Python and Azure is a plus. Ideal...

ComfyUI Workflow Developer | London | Remote-Friendly | £500 - £600 We're working with a high-end creative agency specializing in hyper-realistic CGI for global luxury brands on this exciting opportunity. We are looking for a technical visionary to bridge the gap between AI experimentation and high-end production pipelines. This role is about more than just generating pretty images; it’s about engineering robust, scalable AI architectures using ComfyUI, Python, and Stable Diffusion to meet the exacting standards of the luxury market. You will move from a high-impact POC sprint into a full-scale production deployment, automating asset generation that rivals traditional CGI. The Role Architect and build advanced ComfyUI workflows capable of generating high-resolution, brand-compliant assets at scale. Develop custom Python scripts and API integrations to connect AI pipelines with existing Digital Asset Management (DAM) systems. Transition from a 4-week Proof of...

ComfyUI Workflow Developer | London | Remote-Friendly | £500 - £600 We're working with a high-end creative agency specializing in hyper-realistic CGI for global luxury brands on this exciting opportunity. We are looking for a technical visionary to bridge the gap between AI experimentation and high-end production pipelines . This role is about more than just generating pretty images; it’s about engineering robust, scalable AI architectures using ComfyUI, Python, and Stable Diffusion to meet the exacting standards of the luxury market. You will move from a high-impact POC sprint into a full-scale production deployment, automating asset generation that rivals traditional CG I. The R ole• Architect and build advanced ComfyUI workflows capable of generating high-resolution, brand-compliant assets at sca le.• Develop custom Python scripts and API integrations to connect AI pipelines with existing Digital Asset Management (DAM) syste ms.• Transition from a 4-week...