40 senior developer jobs found

About The Role Senior Applications Developer Contract: March 2026 Working Hours : Full-Time Salary : £384.14 PAYE / £500.00 Umbrella, daily rate Closing Date : Monday 22nd December 2025 About The Role Essex County Council is ambitious and by 2030 it will be one of the most forward looking, effective and financially sustainable Councils in the country. ECC will be a leading-edge digital council that drives excellent customer service with transformation at the heart of service excellence. The Product and Delivery team will provide product leadership and direction for essex.gov.uk. They will develop a bold product vision, translating this into a roadmap of prioritised deliverables, planning and managing the different phases of the product delivery lifecycle, iterating a product over time to meet user needs, and ensuring products are built effectively, on time and to budget, setting high standards to ensure products meet user needs. The team...

UK Research and Innovation (UKRI) is the national funding agency investing in science and research in the UK.   UKRI invests £8 billion of taxpayers' money each year into research and innovation and the people who make it happen. They work across a huge range of fields - from biodiversity conservation to quantum computing, and from space telescopes to innovative health care. They give everyone the opportunity to contribute and to benefit, bringing together people and organisations nationally and globally to create, develop and deploy new ideas and technologies.   As a Senior Full stack developer, your main responsibilities will be:   Essential: Extensive experience of Agile software development and working in SCRUM teams Evidence of contributing to the design of integration solutions between various systems within our architecture Demonstrable experience designing, coding and debugging JavaScript based systems including...

Staff Software Engineer – Robotics & Life Sciences Automation Location: London, UK - Hybrid (3 days/week on site) Contract: 4 months with possibility of extension Start: ASAP (Dec 2025 / Jan 2026) Automata: accelerating breakthroughs that save lives Automata builds automation that accelerates life sciences: enabling faster drug discovery, next-generation personalised medicines, and high-precision diagnostics where turnaround time can mean the difference between life and death. We believe the future of biology depends on automation that is reliable, scalable and accessible — and we’re building the platform that makes that possible. Our modular lab bench and digital automation platform already run mission-critical workflows in leading research organisations. The next evolution of our product will scale globally, unify robotics with reproducible software interfaces, and redefine how scientists interact with instruments. And we’re building...

We are seeking a skilled and motivated Senior Software Engineer to join our Group Technology team in Milton Keynes. In this role, you will help develop, support and enhance business systems and applications using .NET technologies and SQL Server. We offer a hybrid working arrangement with one or two days per week in our Milton Keynes office. Key Responsibilities: Be up to date regarding best practices in software development and deployment Implement best practice coding in relation to development coding standards Use operational data to improve the stability and performance of the applications Maintain documentation and release notes Have awareness of application security considerations Identify dependencies across the organization and work with teams to resolve them before they become an issue, and install preventative measures to mitigate repeat occurrences Effectively handle risk, change, and uncertainty across the organization Work alone or...

Senior Backend / Full-Stack Developer (React Native Experience Preferred)   ** You have to be a UK-based business (grant requirements) **   Commitment: 1–2 days per week (2 days preferred) Contract Length: 12–16 weeks Start Date: ASAP Remuneration: Competitive / TBA   Summary   CalCoach is seeking an experienced senior backend or full-stack developer to join our product team on a part-time contract. You will report directly to the CTO and take ownership of architecting, securing, and delivering the backend for our rebuilt mobile and web platform.   You’ll design and implement scalable backend systems, build our API, handle authentication, integrate LLM workflows, set up cloud infrastructure, implement DevOps pipelines, and ensure the system is production-ready and capable of scaling reliably. The frontend will be handled in-house; your role is to provide the backend foundation and,...

Love empowering and enabling agile teams? Love delivering great digital products? We're looking for an inspiring Senior Delivery Lead to join the ranks of our fast growing & passionate team. We have a wide diversity of clients with some very innovative and challenging projects; we need a tenacious Senior Delivery Lead who can coach clients, resolve complex problems and enable highly skilled, cross-functional teams. All of our projects are Lean/Agile with integrated teams of creative and technical specialists. You'll be working alongside big name clients in a range of sectors including retail, financial services and media and publishing. You'll also be supported by a Director who will oversee a portfolio of projects and Principal Consultants on our larger engagements, but in all cases you will be empowered to represent and lead an enthusiastic, creative and hardworking delivery team who do great work and are keen to socialise and share knowledge with their peers....

MAKE STRATEGY A REALITY | ACCELERATE YOUR GROWTH | CHOOSE YOUR PATH As the world's leading change and transformation consultancy, we're helping businesses move from strategy to reality by taking a pragmatic and practical approach to build solutions that last. We're seeking a Domain Solution Architect to help us take vision to value and create lasting impact for our international retail banking client. Please note, this is an initial 3-6 month inside IR35 PAYE Umbrella contract that will require onsite working in London 2 days per week. Summary As a Domain Payments Solution Architect, you will be responsible for collaborating with stakeholders to understand and articulate their needs, assessing the scope of change and impact to technology, operations, and supporting functions. You will liaise between the various business units, technology teams, delivery, and support teams to arrive at optimal solutions. Your expertise in the corporate banking domain, including...

Job Description UX Design Contractor – 3 Month Contract (Immediate Start) Outside IR35 We’re looking for an experienced UX Designer to join our award-winning digital team on a contract basis. You’ll play a key role in delivering user centred, intuitive and engaging experiences across our customer facing platforms. What You’ll Do: Lead UX work across the full lifecycle from discovery to delivery Help implement upcoming brand changes across digital journeys Create wireframes, prototypes and interaction flows to test and communicate design ideas Work closely with developers to ensure accurate implementation of designs Run iterative design cycles using data, research and feedback Contribute to and maintain our design system and component library Conduct user research and usability testing to inform decisions Collaborate with cross-functional teams including developers, content and marketing Communicate design...

On behalf of the Cabinet Office, we are looking for a Data Scientist (Inside IR35)  for a 2 month contract based REMOTELY .   Note:  SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position, (and speed at which we require a postholder in situ), preference may be given to candidates who meet all of the essential criteria and hold active security clearance   The Applied Data & Insight team (ADI) within the Cabinet Office sit at the centre of the Government Communications profession and are formed from a group of multidisciplinary experts from backgrounds in Digital, Data Science, Software Development, Insight & Evaluation, Behavioural Science and Communications working closely together to deliver effective data-driven solutions across government. We are looking for a Data Scientist to join ADI. The role...

Note: SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position, (and speed at which we require a postholder in situ), preference may be given to candidates who meet all of the essential criteria and hold active security clearance   The Applied Data & Insight team (ADI) within the Cabinet Office sit at the centre of the Government Communications profession and are formed from a group of multidisciplinary experts from backgrounds in Digital, Data Science, Software Development, Insight & Evaluation, Behavioural Science and Communications working closely together to deliver effective data-driven solutions across government.   We are looking for a Senior User Researcher to join our team to help develop and deliver a new round of actionable insight from our 6500 users across 240 organisations. The role holder will work...

The Cabinet Office supports the Prime Minister and ensures the effective running of government. The Cabinet Office is also the corporate headquarters for the government, in partnership with HM Treasury, and takes the lead in certain critical policy areas. More information about the Cabinet Office can be found on its website at: www.gov.uk/government/organisations/cabinet-office   his is an exciting time for the team as we are seeking to make significant changes and improvements to many aspects of how we work and the service we provide, especially investigating new technology available and how this can increase efficiency. You will also be joining the team as it prepares for an increase in activity and responsibility.       You will be joining an expanding team who provide a dedicated and expert function in processing SARs. The team has a strong customer service culture, providing a key service across CO so theability and expertise to build...

The Cabinet Office supports the Prime Minister and ensures the effective running of government. The Cabinet Office is also the corporate headquarters for the government, in partnership with HM Treasury, and takes the lead in certain critical policy areas. More information about the Cabinet Office can be found on its website at: www.gov.uk/government/organisations/cabinet-office   This is an exciting time for the team as we are seeking to make significant changes and improvements to many aspects of how we work and the service we provide, especially investigating new technology available and how this can increase efficiency. You will also be joining the team as it prepares for an increase in activity and responsibility.   You will be joining an expanding team who provide a dedicated and expert function in processing SARs. The team has a strong customer service culture, providing a key service across CO so theability and expertise to build strong professional...

  On behalf of The Ministry of Justice, we are looking for a Project Manager  (Inside IR35 ) for a 3 Month contract which is a hybrid role so does require occasional visits to the London office as required   The Ministry of Justice (MoJ) priorities include improving public safety and reducing reoffending by reforming prisons, probation and youth justice, and building a justice system which makes access to justice swifter and more certain for all citizens whatever their background. Project professionals in the MoJ help to improve the government's ability to protect the public and reduce reoffending, and to provide a more effective, transparent and responsive criminal justice system for victims and the public.   Looking for a Project manager with significant experience in communications. We have a project where the stakeholder landscape is complex and powerful, so we are looking to develop a strategy and project processes to manage the situation....

    Role Overview: The M&A Business Analyst provides analytical and operational support across multiple divestments, with a strong focus on stranded cost analysis, data consolidation, and building structured, automated reporting. The role supports deal teams by bringing clarity to complex data, enabling decision-making, and ensuring high-quality analysis throughout the M&A lifecycle.   What you will do: Pull together data from multiple sources (finance, business operations, regional cost bases, TSA models, vendor files) to create a clear, consistent baseline for each deal. Analyse and structure cost data to identify stranded costs, cost drivers, risks, and potential mitigations. Develop automated dashboards and reporting packs, enabling leadership to track stranded costs, TSA cost recovery, deal impacts, and variances across the M&A pipeline. Collaborate with the M&A technology project team and...

TLT are seeking experienced Contract Project Managers to join us on an 3-6 month contract. This is a chance to work with a leading firm that values innovation, collaboration and excellence in delivery. We deliver pioneering solutions that transform client expectations and the way legal work is done.   This role is offered as an initial 3–6 month contract, with the potential for extension, and will be paid on a day rate via an Umbrella company. We are also open to speaking with Contract Project Managers based in throughout the UK, so if you have strong project management skills and thrive in a fast-paced setting, we’d love to hear from you.   Key Responsibilities Manage projects from initiation to completion, ensuring delivery to agreed time, cost, and quality standards. Coordinate resources, budgets, and timelines across multiple workstreams. Act as a key point of contact for clients on projects, managing expectations and...

Senior Systems Integration Test Analyst Rate: £375pd (Inside IR35) Duration: 3 months initially Location: London (Hybrid, 3 days per week onsite)   Are you a highly experienced Senior Systems Integration Test Analyst with a proven track record in end-to-end technical systems validation? At Ten10, we’re a leading consultancy in Quality Engineering, Software Testing, and DevOps, and we’re looking for someone like you to join us on an interim basis for a challenging and impactful project.   The Role: Specialist in Back-End Systems Integration You will play a crucial role in ensuring that our client’s integrated back-end systems meet the highest standards of quality. This role is highly focused on the technical depth of systems integration and requires a proactive, inquisitive approach to testing in a dynamic environment.   We need a candidate who is naturally inquisitive, is comfortable asking...

Role Overview We are seeking a highly experienced Senior Test Analyst to join our team. The successful candidate will play a key role in analysing requirements, creating high-quality test artefacts, executing tests, identifying defects, and supporting the delivery of robust software solutions. The role requires strong collaboration with developers, test managers, and cross-functional teams to ensure the accuracy, reliability, and testability of new features. Key Accountabilities Analyse user stories, acceptance criteria, and definitions of done to produce clear and accurate test scripts. Maintain high standards of quality and precision across all test artefacts for each release cycle. Prepare detailed test scripts to demonstrate business scenarios and expected outcomes. Log defects accurately with supporting evidence and manage them through to resolution. Ensure all testing activities adhere to agreed schedules and quality...

Senior Optimisation Lead required to join our Customer Insight & Activation team on a contract basis Contract - Remote The opportunity: Optimisation Lead/Manager required to join our first-class Commerce organisation and to work alongside a wide range of international clients. This is hands on role working directly with clients on their CRO and experimental campaigns. What you'll be doing: Account & Project Lead for Conversion Rate Optimisation (CRO) activity: Day to day lead across all CRO/experimentation activity, covering multiple clients Understand the client's business and challenges in order to identify suitable solutions, with a particular focus on CRO (working collaboratively with CX and data insight teams) Manage resourcing and timelines, ensuring delivery of key milestones against schedule and budget Commercially minded, able to create and manage budgets and monitor costs and ROI Contribute to forecasting, month-end...

Network Rail is at the heart of revitalising Britain's railway. From Crossrail - Europe's largest civil engineering project - to investment in world-class stations and major programmes of electrification, we are involved in some of the most ambitious and diverse ventures that this country has ever seen. We at Network Rail are dedicated to becoming one of Britain 's best employers and believe this starts with placing the candidate at the heart of everything we do!   As a  Project Manager , your main responsibilities will be to:   Control and lead and control the development of robust Development/Approval in Principle for assigned projects, focussing on specific and measurable outcomes, benefits and requirements, to achieve an unambiguous procurement exercise and efficient contract award. Identify and secure optimum options for clients and funders considering programme/schedule and cost options, contribute to the strategic planning, alignment and...

Job Description UX Design Contractor – 3 Month Contract (Immediate Start) Outside IR35 We’re looking for an experienced UX Designer to join our award-winning digital team on a contract basis. You’ll play a key role in delivering user centred, intuitive and engaging experiences across our customer facing platforms. What You’ll Do: Lead UX work across the full lifecycle from discovery to delivery Help implement upcoming brand changes across digital journeys Create wireframes, prototypes and interaction flows to test and communicate design ideas Work closely with developers to ensure accurate implementation of designs Run iterative design cycles using data, research and feedback Contribute to and maintain our design system and component library Conduct user research and usability testing to inform decisions Collaborate with cross-functional teams including developers, content and marketing Communicate design...