35 senior backend developer jobs found

. Methods Business and Digital Technology Limited Methods is a £100M+ IT Services Consultancy who has partnered with a range of central government departments and agencies to transform the way the public sector operates in the UK. Established over 30 years ago and UK-based, we apply our skills in transformation, delivery, and collaboration from across the Methods Group, to create end-to-end business and technical solutions that are people-centred, safe, and designed for the future. Our human touch sets us apart from other consultancies, system integrators and software houses - with people, technology, and data at the heart of who we are, we believe in creating value and sustainability through everything we do for our clients, staff, communities, and the planet. We support our clients in the success of their projects while working collaboratively to share skill sets and solve problems. At Methods we have fun while working hard; we are not afraid of making mistakes and...

. Methods Business and Digital Technology Limited Methods is a £100M+ IT Services Consultancy who has partnered with a range of central government departments and agencies to transform the way the public sector operates in the UK. Established over 30 years ago and UK-based, we apply our skills in transformation, delivery, and collaboration from across the Methods Group, to create end-to-end business and technical solutions that are people-centred, safe, and designed for the future. Our human touch sets us apart from other consultancies, system integrators and software houses - with people, technology, and data at the heart of who we are, we believe in creating value and sustainability through everything we do for our clients, staff, communities, and the planet. We support our clients in the success of their projects while working collaboratively to share skill sets and solve problems. At Methods we have fun while working hard; we are not afraid of making mistakes and...

Methods Business and Digital Technology Limited Methods is a £100M+ IT Services Consultancy who has partnered with a range of central government departments and agencies to transform the way the public sector operates in the UK. Established over 30 years ago and UK-based, we apply our skills in transformation, delivery, and collaboration from across the Methods Group, to create end-to-end business and technical solutions that are people-centred, safe, and designed for the future. Our human touch sets us apart from other consultancies, system integrators and software houses - with people, technology, and data at the heart of who we are, we believe in creating value and sustainability through everything we do for our clients, staff, communities, and the planet. We support our clients in the success of their projects while working collaboratively to share skill sets and solve problems. At Methods we have fun while working hard; we are not afraid of making mistakes and...

Location : Fully Remote Team : Tech Team Employment Type: Contract Tangible is a fast-growing, tech-driven platform providing liquidity solutions to LPs and GPs in the private-markets secondaries space. By combining deep sector expertise with modern infrastructure, we unlock liquidity across private equity, private credit, and real assets, transforming the industry and enabling investors to move faster and smarter. Tasks • Design, develop, and maintain robust, scalable application features and services. • Contribute to both client-facing and server-side components of the platform. • Write clean, readable, and well-tested code following engineering best practices. • Participate in architectural discussions and contribute to system design decisions. • Collaborate closely with QA, DevOps, Product, and Design teams. • Review code, participate in pull requests, and support pair programming. •...

Senior Java/React Full Stack Developer Location: London or Newcastle, UK (Hybrid - ~1 day per week in office / onsite) Contract: Contract - 6 months with view to extend Day Rate: £550–£600 per day - Outside IR35 About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy. We help organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering work focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience. About the Role We are looking for a Senior Java/React Full Stack Developer to join Appvia on a contract basis, working as a hands-on engineering consultant within our Solutions Engineering team. This role is focused on modernising large, complex software systems, reducing technical debt,...

Senior Java/React Full Stack Developer Location: London or Newcastle, UK (Hybrid - ~1 day per week in office / onsite) Contract: Contract - 6 months with view to extend Day Rate: £550 - £600 per day - Outside IR35 About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy. We help organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering work focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience. About the Role We are looking for a Senior Java/React Full Stack Developer to join Appvia on a contract basis, working as a hands-on engineering consultant within our Solutions Engineering team. This role is focused on modernising large, complex software systems, reducing technical debt, and improving...

Senior Java/React Full Stack Developer Location: London or Newcastle, UK (Hybrid - ~1 day per week in office / onsite) Contract: Contract - 6 months with view to extend Day Rate: £550 - £600 per day - Outside IR35 About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy. We help organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering work focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience. About the Role We are looking for a Senior Java/React Full Stack Developer to join Appvia on a contract basis, working as a hands-on engineering consultant within our Solutions Engineering team. This role is focused on modernising large, complex software systems, reducing technical debt, and improving...

We’re looking for an experienced Senior Full-Stack Developer to help turn an early AI prototype into a secure, scalable service that will be used across the Ministry of Justice. This is a hands-on role for someone who enjoys working across the full stack, collaborating closely with multidisciplinary teams, and solving real operational problems with modern technology. Mostly remote at £700/day, 6-month contract.   About the role You’ll join a multidisciplinary group including Data Scientists, DevOps, User Research, Product, Delivery and Interaction Design. The team has already developed an early prototype for an AI-powered Personally Identifiable Information (PII) redaction tool, and this role will focus on evolving that into a production-ready MVP.   The service supports the Ministry of Justice in addressing growing demand for data access requests by helping modernise existing, largely manual processes. Your work will directly...

About the Role Join the Justice Redact team at the Ministry of Justice to design and build both the backend and frontend of an AI-powered Personally Identifiable Information (PII) redaction Minimum Viable Product (MVP). You'll work alongside Full-Stack Developers, Data Scientists, a User Researcher, Product Lead, Delivery Manager, Subject Matter Experts and a Senior Interaction Designer.   The team's Data Scientists have already developed an early prototype and you'll work closely with them to ensure everything runs smoothly, securely and reliably from front-end to back-end. This project addresses a major challenge: meeting rising demand for data through Subject Access Requests (SARs), Freedom of Information (FOI) requests and other information-heavy use cases. Current workflows are manual and fragmented, making it hard to meet strict legal deadlines and driving up costs. Your role will be pivotal in modernising these processes, improving efficiency and reducing...

Plume is looking for a mid-senior Full Stack Engineer to support the development of our custom Learning Management System, built on Strapi, React and Node.   This is an initial contractor role with the potential to evolve into a longer term full-time position. Candidates must be based in a European timezone.   You will be contributing to client projects delivered in an agency environment, as well as occasional work on our in-house product. Because much of the work is client facing, the role requires strong communication skills, consistent time tracking and the ability to collaborate with a Project Manager to estimate work accurately and deliver to those estimates. You should be comfortable discussing requirements, demonstrating progress and raising risks early.   You will work across our monolithic Strapi codebase and React applications. This includes schema design, content structures, permissions, endpoints, performance improvements and...

Senior Software Engineer (Contractor)   OUTSIDE IR35   Senior Software Engineer – Stock Ordering Team   Overall Ambition Solve complex hospitality challenges by building and integrating scalable, reliable, and efficient stock systems and support its integrations.   The Stock Ordering Team We are forming a new team to support the Stock and Finance domains. Several established product teams currently focus on Stock System innovation, Ingredients Management, New Product Development, and Purchase Order Management. This team will provide support and take strategic steps to improve stock operations.   Key responsibilities will include integrating external supplier APIs, implementing Software Reliability Engineering (SRE) best practices, and closely collaborating with existing teams to develop new software solutions. The team will enhance resilience, observability, incident management, and disaster recovery...

We are looking for a Principal Full-Stack Engineer to take technical ownership across backend and frontend development, shaping high-quality, scalable solutions and setting engineering standards for the team. This role combines hands-on delivery with technical leadership, mentoring, and close collaboration with product and platform teams. You will work across modern backend services built in Kotlin, rich frontend applications using React and Next.js with TypeScript, and cloud-native infrastructure on Azure or AWS.   This is an initial 6 month contract (outside iR35) that requires you onsite in London Paddington 3 days a week.   Key Responsibilities Lead the design and development of full-stack solutions, balancing backend robustness with high-quality user experiences Build and maintain backend services using Kotlin , following clean architecture and best practices Develop modern, performant frontends using React, Next.js, and...

Mindera is looking for a Java Engineer with hands-on experience in OpenTelemetry (OTEL) to join our backend engineering team. You’ll play a key role in designing, building, and instrumenting high-performance Java services. Requirements Design, develop, and maintain scalable Java-based microservices and backend systems. Implement observability best practices using OpenTelemetry (OTEL) for tracing, metrics, and logging. Collaborate with platform and DevOps teams to integrate telemetry data with systems such as Grafana, Prometheus, Jaeger, or Tempo . Define and maintain instrumentation standards across Java applications to ensure consistency and performance visibility. Diagnose complex production issues through telemetry data and performance profiling. Contribute to architectural discussions on service design, distributed systems, and monitoring strategy. Write clean, efficient, and testable code following best practices in CI/CD and...

We are looking for a Test Lead/ Manager to join our crew! You’ll play a key role in driving our ambition to build a best-in-class engineering culture—where quality, collaboration, and continuous improvement sit at the heart of everything we do. We’re looking for an experienced Test Manager to join our client's Loyalty team and help deliver seamless, high-quality digital experiences to millions of customers. You’ll lead the testing strategy and ensure the reliability of systems that integrate personalized offers and mission-based rewards into our customer journey. Working closely with developers, data scientists, and the core loyalty platform team, you’ll help create a modern digital ecosystem powered by data and built with cutting-edge technology.   This is an initial 6 month contract (outside IR35). You will be required on client site 3 days a week in Paddington, London.   What You’ll Do: Test Leadership...

Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial instruments and systems. Bonus...

Toucanberry Tech is a UK-based boutique software consultancy delivering high-impact solutions to the financial sector. You’ll be joining a pivotal project, building a cutting-edge reinsurance platform from the ground up for a global reinsurer in Bermuda.   ROLE: We are looking for a hungry and hands-on Product Owner to join our dedicated onshore team. This is not a project management role; we need a modern start up Product Owner who lives and breathes the product, sits side-by-side with our developers, and is passionate about building exceptional backend, data-centric solutions. Key Responsibilities: Own and manage the product backlog, translating high-level business requirements into clear, actionable user stories for the development team. Collaborate daily with a co-located, onshore squad of engineers, QAs, and designers to ensure seamless delivery and a shared understanding of the product vision. Define and analyse metrics to inform...

Toucanberry Tech is a UK-based boutique software consultancy delivering high-impact solutions to the financial sector. We work in agile, cross-functional teams to solve complex challenges with speed, autonomy, and innovation. The Role We are looking for a hands-on Data Product Owner to join our dedicated onshore team. We need someone with a start up mindset who lives and breathes the product, sits side-by-side with our developers, and is passionate about building exceptional backend, data-centric solutions. Key Responsibilities: Owning the end-to-end data lifecycle, from ingestion and transformation through to modelling, analysis, and visualisation. Converting disparate raw data into reliable, structured datasets ready for modelling, analysis, and visual reporting. Managing the product backlog, translating high-level business requirements into clear, actionable user stories. Leading a high-performing squad of engineers and analysts to ensure seamless delivery and...

6 Month Contract London or Manchester We are seeking a highly skilled Senior Product Develope r to join our team and play a key role in building and enhancing our Intranet Product. This position requires deep expertise in SharePoint development and integration, combined with strong proficiency in modern web technologies and cloud services. This role sits within our award-winning Fresh team, which creates beautiful, personalised intranets that empower people to do their best work. You can find out more about our Fresh business here About Fresh Fresh Intranet Recent MSP winners of the UK MSP of the year at 2025 MSP Channel Awards Join an award-winning Microsoft partner and leading technology provider for mid-market businesses. Read more about our Microsoft Designations and Awards here we are also one of the first to achieve the newly launched Microsoft Support Services Designation   Salary & Benefits The budgeted salary for this role...

6 Month Contract London or Manchester We are seeking a highly skilled Senior Product Develope r to join our team and play a key role in building and enhancing our Intranet Product. This position requires deep expertise in SharePoint development and integration, combined with strong proficiency in modern web technologies and cloud services. This role sits within our award-winning Fresh team, which creates beautiful, personalised intranets that empower people to do their best work. You can find out more about our Fresh business here About Fresh Fresh Intranet Recent MSP winners of the UK MSP of the year at 2025 MSP Channel Awards Join an award-winning Microsoft partner and leading technology provider for mid-market businesses. Read more about our Microsoft Designations and Awards here we are also one of the first to achieve the newly launched Microsoft Support Services Designation   Salary & Benefits The budgeted salary for this role...

We are seeking a passionate Software Engineering Manager who will provide technical expertise, ship thoughtfully and operate with excellence. Being creative, curious, and confident, you will be an integral part of our empowered, self-managing, multi-disciplinary engineering teams - designing, building, releasing, and maintaining products. You will play a key role in driving our ambition to create a best-in-class software engineering team, environment, and culture. This is an initial 6 month contract (outside IR35) that requires you to work on client site 3 days a week in London, Paddington. Requirements   Your key accountabilities will include: Team Management: Build, mentor, and manage a high-performing software engineering team. Foster a culture of collaboration, innovation, and continuous improvement within the team. Facilitate communication and collaboration among team members. Ensure budgets, people and resource allocation, and workload,...