Average Fullstack Developer salary in the UK

Senior Fullstack Developer l React Native l Typescript l AWS serverless l end to end features l GraphQL l £550 per day l Outside IR35 l three days a week in London l 6 monthsWe're hiring a Senior Fullstack Developer to join a high-performing team shipping fast across mobile and backend. This role will be hands-on, building and owning features end to end.Essential Skills & ExperienceStrong TypeScript / JavaScriptExperience in fast-paced, iterative teams4+ years in your core areaConfident delivering end-to-end featuresComfortable jumping across frontend + backendReact Native (large-scale apps)AWS / ServerlessDesirableSwiftUICI/CD realease pipelinesTerraform l IaCOpen-srouce contributionsContract:Rate: £550 per dayContract: Outside IR35Location: London hybrid - three days a weekDuration: Initial 6 month contractStart date: ImmediateIf you're interested, please apply or send your cv to and I'll be in touch!Senior Fullstack Developer l React Native l Typescript l AWS serverless l end to end features l GraphQL l £550 per day l Outside IR35 l three days a week in London l 6 monthsRSG Plc is acting as an Employment Business in relation to this vacancy.

I am currently working with a London-based financial services client who are actively seeking a Senior Fullstack Python Developer to work on the development of a next-generation research platform.What you'll need to succeed:Strong Python software engineering experience beyond exploratory scriptsHands-on experience working with notebooks as part of real analytical or research workflowsExperience building systems that support data analysis, simulations, or computational researchUnderstanding of the challenges around reproducibility, dependency management, and scientific software performanceComfortable working across the stack (backend + UI or APIs)Ability to collaborate closely with non-traditional "software engineer" users such as researchers, quants, or scientistsBackground in quantitative finance or research engineeringWhat you'll get in return:Up to £1100pd Umbrella.Initial 12-month contract with extensions.London-based hybrid working.What you need to do now:If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

About the RoleWe are looking for a Full Stack AI & Automation Solutions Developer to design, build, and maintain software solutions supporting an ambitious technology transformation programme.You will play a hands-on role in developing full stack applications, integrations, APIs, AI agents, and automation solutions across a Microsoft and Azure ecosystem. This includes integrating Microsoft 365 Copilot, Claude Cowork, and Azure-based data platforms with business-critical systems including practice management, CRM, and document management solutions.This is a developer-first role suited to someone who enjoys building production-quality software, solving complex technical challenges, and turning business requirements into scalable solutions.ResponsibilitiesDesign, build, and maintain full stack applications, internal tools, APIs, and cloud-based services using technologies including Python, TypeScript, and C#.Develop integrations between AI platforms, Microsoft Azure, and core business systems.Build modern frontend applications and dashboards using frameworks such as React or Angular, alongside Power BI reporting solutions.Create AI agents, automated workflows, and connectors within Microsoft Copilot Studio and Claude Cowork.Develop Retrieval-Augmented Generation (RAG) pipelines, document automation tools, and LLM-powered solutions.Contribute to Azure infrastructure, including data pipelines, storage, integrations, governance, and security.Collaborate with technical and business stakeholders to scope and deliver technology solutions.Produce clear technical documentation and support ongoing maintenance and knowledge transfer.Mentor and support junior developers within the technology team.Technology EnvironmentMicrosoft 365 Copilot & Copilot StudioCustom agents are being developed across Teams, SharePoint, and Outlook. This role will focus on building and maintaining these agents, integrations, and governance controls.Claude CoworkClaude Cowork is being deployed as an agentic desktop platform for knowledge workers. The successful candidate will develop custom plugins, connectors, reusable skills, and automation workflows integrated with internal systems.Microsoft AzureThe Azure-based data platform supports data storage, processing, integration, and governance. You will contribute to the ongoing development and maintenance of this environment.RequirementsEssential Skills & Experience4-5+ years' experience delivering production-quality software across multiple technologies.Strong full stack development experience across frontend, backend, APIs, and cloud infrastructure.Experience building AI, automation, or LLM-based integrations in production environments.Working knowledge of Microsoft 365 Copilot Studio and/or Claude Cowork, including agent and connector development.Experience developing and deploying solutions on Microsoft Azure.Proven ability to take projects from discovery and scoping through to deployment and handover.Strong communication skills with both technical and non-technical stakeholders.Desirable Skills & ExperienceExperience developing plugins, skills, or connectors for agentic AI platforms.Experience with AI orchestration frameworks such as LangChain or LangGraph.Knowledge of Microsoft Power Platform, including Power Automate and Power Apps.Experience working within professional services or regulated environments.Understanding of data governance, GDPR, and information security best practices.