38 senior software engineer jobs found

Senior Software Engineer Full Stack Developer (Frontend most important) TypeScript or Express.js / Kotlin or Springboot / AWS Initial 6 Month Contract Fully Remote (UK Based) £525-550 per day, Outside IR35 Active SC required We're working with a UK Consultancy client who are putting a team together to deliver a high-profile Cloud-Native Government program. We need Senior Software Engineers who hold active SC Clearance, and have good Full Stack experience with Kotlin, Spring Boot (Java), Express.js or TypeScript, AWS and Terraform or AWS CloudFormation. The Frontend experience is preferable. Urgent Contracts starting ASAP, fully remote, paying up to £550 per day, Outside IR35. Initial 6 month engagement with long term extensions. Tech stack: Frontend (Frontend is the more important end of the stack for this role) Building UIs using Express.js and TypeScript GDS standards Nunjucks Integrating with the backend services Backend...

Software Engineer — Node & Typescript 12 month contract, Outside IR35 Remote £530 - £570 per day We’re working with a FinTech company who are looking for 6 capable, self-driven Senior Software Engineer to help build and evolve their products Their technology already powers some of the UK’s most ambitious fintechs, banks, financial advisers and wealth firms, with close to a million investors relying on their platforms. In this role you will design, build and operate reliable and scalable, testable and maintainable software solutions, building new functionalities and products using Typescript and Node.js. As this is a senior level role you will be expected operate confidently with clients and senior stakeholders What we’re looking for Strong commercial experience with Node.js, specifically TypeScript Experience with Amazon Web Services Experience with Serverless products Experience with document databases, ideally MongoDB Experience mentoring engineers...

Software Engineer - Node & Typescript 12 month contract, Outside IR35 Remote £530 - £570 per day We're working with a FinTech company who are looking for 6 capable, self-driven Senior Software Engineer to help build and evolve their products Their technology already powers some of the UK's most ambitious fintechs, banks, financial advisers and wealth firms, with close to a million investors relying on their platforms. In this role you will design, build and operate reliable and scalable, testable and maintainable software solutions, building new functionalities and products using Typescript and Node.js. As this is a senior level role you will be expected operate confidently with clients and senior stakeholders What we're looking for Strong commercial experience with Node.js, specifically TypeScript Experience with Amazon Web Services Experience with Serverless products Experience with document databases, ideally MongoDB Experience mentoring engineers...

This role is remote within the UK, and we're looking for engineers available quickly to join us for 6 months under O/IR35 requirements. About Us Seccl is the Octopus-owned embedded investment platform, on a mission to help more people invest, and invest well. We’re building the infrastructure behind the next generation of investing. Our technology already powers some of the UK’s most ambitious fintechs, banks, financial advisers and wealth firms, with close to a million investors relying on Seccl-powered platforms. And we’re now expanding into Europe. We’ve got a proven product, strong momentum and big ambitions for what comes next: helping more household-name brands launch and scale investment propositions, entering new markets and replacing outdated investment infrastructure with technology that’s faster, simpler and built for scale. We’re proud to be part of Octopus, one of the UK’s most successful privately held investment and technology groups. That gives us the...

Senior Full Stack .NET Developer - Contract C# .NET ASP.NET Core Vue 3 TypeScript REST APIs £400-£450 per day Outside IR35 Remote UK Contract We're looking for an experienced Senior Full Stack .NET Developer/.NET Contractor to join a global SaaS engineering environment, working across Back End services and a modern web application. This is a UK-based remote contract working with an international engineering team across the UK, New Zealand, US and Canada. You MUST be UK based to be considered. The Role You'll be hands-on across C#, .NET, ASP.NET Core Web APIs, Vue 3 and TypeScript, developing new functionality and enhancing an established SaaS platform. You'll work across: C#/.NET/ASP.NET Core/.NET 5+ Vue 3/TypeScript/Composition API/ REST APIs & Back End services Automated testing & maintainable code GitHub & modern development practices AI-assisted development tools such as Claude Code You'll be joining an established...

Senior Full Stack .NET Developer - Contract C# | .NET | ASP.NET Core | Vue 3 | TypeScript | REST APIs £400 - £450 per day | Outside IR35 | Remote UK | Contract We're looking for an experienced Senior Full Stack .NET Developer / .NET Contractor to join a global SaaS engineering environment, working across backend services and a modern web application. This is a UK-based remote contract working with an international engineering team across the UK, New Zealand, US and Canada. You MUST be UK based to be considered. The Role You 'll be hands-on across C#, .NET, ASP.NET Core Web APIs, Vue 3 and TypeScript, developing new functionality and enhancing an established SaaS platform. You 'll work across: C# / .NET / ASP.NET Core / .NET 5+ Vue 3 / TypeScript / Composition API / REST APIs & backend services Automated testing & maintainable code GitHub & modern development practices AI-assisted development tools such as...

Senior AI Engineer (Full Stack AI & Agentic Systems) - Python/React/FastAPI - OUTSIDE IR35 - Telco Sector - Enterprise AI Platform Tecknuovo is a digital technology consultancy with a Deliberately Different approach. We believe great outcomes come from great people, not just great technology. We move quickly, work collaboratively, and ensure our clients are left with Zero Dependency at the end of every engagement. What you'll be working towards: We're looking for an experienced Senior AI Engineer to join a strategic enterprise AI programme supporting the continued evolution of a large-scale AI platform. This engagement focuses on developing and scaling next-generation AI capabilities that provide conversational access to enterprise data and services through Large Language Models (LLMs), Retrieval-Augmented Generation (RAG) and Agentic AI. You'll play a key role in shaping the future direction of the platform, helping to define AI architecture, governance...

Senior React/Node.JS engineer + LLM's - 6 month contract - £500-£600 per day Greenfield application Company Description Working with a highly successful fintech company specialising in global payments on a greenfield application. Role Description We are seeking a Senior React/Node.JS Engineer with experience building with LLMs. This is a fully remote role which can be based across Europe,.The position entails developing, maintaining, and optimizing web applications using Angular and Node.JS technologies, collaborating with cross-functional teams, and ensuring code quality through best practices. The successful candidate will play a crucial role in designing and implementing scalable payment solutions aligned with business requirements. Qualifications Strong proficiency in React and Node.JS frameworks Strong proficiency with Typescript Strong experience building with LLM's and Data modelling Proficiency in front-end technologies like HTML, CSS, and...

Principal Full Stack Engineer - Azure AI Search & Elasticsearch 6-month contract Outside IR35 London - 2 days onsite We are looking for a Principal Full Stack Engineer to lead the design and delivery of enterprise search and AI-driven applications. This is a senior, hands-on contract combining search architecture, full-stack development, Microsoft Azure, DevOps and Generative AI. Key responsibilities Design and optimise enterprise search solutions using Elasticsearch and Azure AI Search. Define Elasticsearch cluster architecture, index mappings, aggregation queries and life cycle strategies. Improve search relevance, indexing performance, query latency and platform resilience. Build Azure AI Search solutions using indexers, custom skillsets, vector search and semantic ranking. Develop responsive, search-focused applications using JavaScript/TypeScript and React, Angular or Vue. Design and integrate APIs and Back End services across the Azure ecosystem. Build...

Senior Agentic AI Engineer / AI Orchestrator 3- month rolling contract | Outside IR35 / B2B | Fully remote | UK working hours | Start within 4 weeks *MUST BE BASED IN THE UK Evantis Technology is looking for a senior, hands-on engineer to help a confidential client establish an AI-first software-delivery model. You’ll design and operate multi-agent coding workflows covering specification, implementation, testing, review and release—while ensuring humans retain control of key technical and production decisions. We’re looking for experience in: Orchestrating multiple coding agents in parallel. Claude Code, Codex or comparable coding-agent tooling. Shared context, memory, MCP, tooling and agent handovers. Human approval gates, evaluations, guardrails, observability and failure recovery. Delivering measurable improvements in engineering speed, quality or capacity. Helping established engineering teams adopt these working practices. This...

Senior Software Engineering Consultant (Contract) AI Software Engineering Consulting £450-500 per day | Outside IR35 | 3 & 6 Month Contracts Leeds Hybrid / Flexible Working (Must be UK based) WRK digital are proud to be the exclusive recruitment partner for an award-winning digital product and technology consultancy that is scaling rapidly due to a number of exciting client projects, new platform developments and product improvement initiatives. We're looking for experienced Software Engineering Consultants who thrive in complex environments, enjoy solving difficult technical challenges and want to work closely with clients to shape products, platforms and technology decisions. This isn't a role where you'll simply deliver tickets from a backlog. You'll work directly with clients, contribute to architecture and technical strategy, build modern software products and leverage AI-enabled development practices to help teams deliver value at...

Our client is seeking an experienced Autonomy Solution Architect for a senior contract role within the defence and security sector. Based in the UK with hybrid working, this opportunity involves taking ownership of the end-to-end technical solution for an advanced autonomy platform, supporting the development and deployment of autonomous and uncrewed systems from concept through to operational service. Key Responsibilities: Own and develop the architecture for an advanced autonomy platform, including onboard systems, mission management, communications, simulation environments and remote operational capabilities. Define system interfaces, APIs, data models, telemetry architectures and non-functional performance requirements. Translate customer requirements, operational needs and product priorities into technical roadmaps and deliverable capability increments. Lead architectural decisions across software, autonomy, communications, safety and cyber security domains. Develop...

Senior Backend Engineer (Java) One of the world’s leading ecommerce travel platforms are hiring for a Senior Backend Engineer. Role Overview We are looking for a Senior Backend Engineer to design, build, and evolve scalable, reliable, and high-performance backend services. This role is suited for engineers who can quickly understand complex distributed systems, make sound technical decisions, lead implementation of large initiatives, and consistently deliver production-ready software with minimal supervision. In addition to hands-on development, you will help drive technical excellence through architecture, code quality, and mentoring. Able to become productive within the first few weeks. Comfortable working in large, existing codebases. Strong engineering fundamentals and pragmatic decision making. Excellent debugging and problem-solving skills. Clear written and verbal communication. Advanced Claude and Codex usage. Reliable delivery with minimal...

Senior C# / Azure Engineer Contract £650-£700 per day Outside IR35 Method Resourcing are partnering with a leading Data & AI consultancy on an exciting programme within Wealth Management, building AI agents to transform and automate the customer onboarding journey. The initial design phase has been completed and the programme is now moving into build. We are looking for up to two experienced C# / .NET Engineers to help establish the technical foundations and support the wider engineering team through delivery. We are looking for strong software engineers who understand C#, Azure and event-driven architectures, with exposure to modern AI/agent-based applications. The role You will work within an existing C# and Azure environment, helping the team understand and extend the client's current architecture while establishing robust engineering patterns for the build. You will : Review and understand an existing **C#/.NET codebase Work with existing **Azure Functions...

Senior Backend Engineer (Java) One of the world's leading E-commerce travel platforms are hiring for a Senior Backend Engineer. Role Overview We are looking for a Senior Backend Engineer to design, build, and evolve scalable, reliable, and high-performance Back End services. This role is suited for engineers who can quickly understand complex distributed systems, make sound technical decisions, lead implementation of large initiatives, and consistently deliver production-ready software with minimal supervision. In addition to hands-on development, you will help drive technical excellence through architecture, code quality, and mentoring. Able to become productive within the first few weeks. Comfortable working in large, existing codebases. Strong engineering fundamentals and pragmatic decision making. Excellent debugging and problem-solving skills. Clear written and verbal communication. Advanced Claude and Codex usage. Reliable delivery with minimal supervision....

Senior Java Developer | Outside IR35 | Remote We are looking for an experienced Java Developer to support the development of modern, user-focused digital services on a large-scale public sector programme. You will work as part of a multidisciplinary engineering team, building and improving secure, resilient cloud-native applications. The Role This is a hands-on engineering role with a core focus on Java Back End development, while contributing across the wider delivery life cycle. You will develop services, APIs and integrations, work with TypeScript-based Front End applications, and help improve the cloud infrastructure and delivery pipelines that support the platform. Key Responsibilities Build, enhance and maintain Back End services and APIs using Java and Spring Boot. Contribute to TypeScript Front End development, delivering accessible and maintainable user journeys. Design and develop solutions using PostgreSQL, with a focus on reliable data handling and performance....

Senior C# / Azure Engineer Contract | £650- £700 per day | Outside IR35 Method Resourcing are partnering with a leading Data & AI consultancy on an exciting programme within Wealth Management, building AI agents to transform and automate the customer onboarding journey. The initial design phase has been completed and the programme is now moving into build. We are looking for up to two experienced C# / .NET Engineers to help establish the technical foundations and support the wider engineering team through delivery. We are looking for strong software engineers who understand C#, Azure and event-driven architectures, with exposure to modern AI/agent-based applications. The role You will work within an existing C# and Azure environment, helping the team understand and extend the client 's current architecture while establishing robust engineering patterns for the build. You will : Review and understand an...

Overview An exciting opportunity has arisen for a hands-on Front End Lead / Interim Tech Lead to join a growing product engineering team and lead the development of a next-generation SaaS platform built on Microsoft Azure. This role is ideal for a senior engineer who thrives in a fast-paced environment, enjoys building products from the ground up, and wants to remain deeply involved in coding while leading a small team. You'll be responsible for defining front-end engineering standards, implementing AI-assisted development practices, and driving delivery of a modern React-based application. Initially offered as a day-rate contract, there is a genuine intention to transition the successful candidate into a permanent Tech Lead position as the engineering function expands. The Role As Front End Lead, you will take ownership of the front-end architecture and delivery of a new React/TypeScript application, working closely with Product, Platform and Data teams. This is a highly...

Network Security Engineer Initial 6-month Contract Remote working £400 - £475, Outside IR35 We're looking for an experienced Network Security Engineer to support security transformation and technology projects within a large enterprise environment. The role will focus on implementing and enhancing network security solutions, supporting secure cloud and container environments, and working closely with technical teams and stakeholders to ensure security requirements are met across business-critical platforms. Key Responsibilities: Implement and support network security technologies and controls Support container and cloud security initiatives Work across the Software Development Lifecycle and DevSecOps environments Manage and enhance identity and access management solutions Work closely with technical teams, architects and senior stakeholders Assess security risks and support remediation activities Support technology transformation and modernisation projects Requirements:...

Network Security Engineer Initial 6-month Contract Remote working £400 - £475, Outside IR35 We're looking for an experienced Network Security Engineer to support security transformation and technology projects within a large enterprise environment. The role will focus on implementing and enhancing network security solutions, supporting secure cloud and container environments, and working closely with technical teams and stakeholders to ensure security requirements are met across business-critical platforms. Key Responsibilities: Implement and support network security technologies and controls Support container and cloud security initiatives Work across the Software Development Lifecycle and DevSecOps environments Manage and enhance identity and access management solutions Work closely with technical teams, architects and senior stakeholders Assess security risks and support remediation activities Support technology transformation and modernisation projects...