45 senior software engineer jobs found

Senior Software Engineer - Node & React Remote with very occasional client visits £420 - £440pd Outside IR35 3-month contract Our client, an established and successful Consultancy are looking for an experienced Developer to join them on a contract basis. With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders This is a completely hands-on role where you will develop and maintain scalable, full-stack web applications using Next.js and Node.js We are looking for: Demonstrable and proven experience in full-stack applications (inc. working knowledge of a range of technologies such as React, Node.js and TypeScript). Experience with Azure and ARM templates including dev and deployment of supporting cloud infrastructure (inc. pipelines). Excellent, in-depth understanding of BDD, TDD and SOLID principles. In-depth...

Senior Software Engineer - Node & React Remote with very occasional client visits £420 - £440pd Outside IR35 3-month contract Our client, an established and successful Consultancy are looking for an experienced Developer to join them on a contract basis click apply for full job details

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...

Senior Software Engineer | Python | Outside IR35 | Remote We are supporting a high-profile public sector programme delivering an AI-enabled product from proof of concept through to user testing. This is a hands-on Senior Software Engineer role where you will take significant ownership of delivery, working as part of a multidisciplinary team to build, iterate and operationalise an AI use-case MVP. The Role As a Senior Software Engineer, you will play a key role in delivering a greenfield AI solution from early-stage prototype into a robust, testable product. Working closely with engineers, data scientists and a User-Centred Designer, you will help shape the architecture, build a new user interface, and ensure the solution is production-ready within a secure cloud-native environment. This is a senior, hands-on engineering role suited to someone comfortable taking ownership of significant components or services across the full lifecycle - from design and build through to...

We 're partnering with a fast-growing sports/entertainment business to hire a Senior Backend Engineer with hands-on experience in HubSpot and complex backend systems. This is a 6-month contract, outside IR35, with potential for extension or permanent conversion. The Role You 'll take full ownership of the Commercial Data Manager (CDM) platform and the HubSpot ecosystem, bringing previously external-managed systems fully in-house. This role combines backend development, integrations, and stakeholder collaboration, giving you real technical leadership and system ownership from day one. Key Responsibilities: Lead the CDM platform (70%) and HubSpot system (30%) Take over HubSpot maintenance, expansion, and integrations Collaborate closely with commercial stakeholders to implement new fields/features Mentor engineers and shape team practices Drive architecture and integration decisions across multiple services Team...

X2 Senior Backend Engineer (Node) – 6-Month Contract (Extension Likely) - £600 a day - OUTSIDE IR35 FRESH has partnered with a global online media and technology company that builds communities and products reaching 100's millions people annually across iGaming, Sports Betting, and Finance. What You’ll Be Doing: Lead on design, architecture, and best practice while mentoring other engineers Collaborate with Engineering, Delivery, and Product to deliver scalable, high-quality solutions Key skills you’ll bring: Strong experience with NodeJS/TypeScript Proficiency in SQL Solid experience with AWS Ability to effectively lead and collaborate with engineering teams Interested in hearing more, hit the apply button and I'll be in contact! X2 Senior Backend Engineer (Node) – 6-Month Contract (Extension Likely) - £600 a day

Senior Software Engineer | Python | Outside IR35 | Remote Cloud, Data & AI Platforms We are supporting a consultancy with a substantial UK portfolio as it accelerates its digital, data and AI capability. As part of a wider transformation programme, we're looking for a Senior Software Engineer to help design and deliver scalable cloud-native platforms, with increasing adoption of AI and machine learning to drive smarter decision-making. This is a senior, hands-on role within a multidisciplinary engineering environment, blending modern software delivery, cloud platform engineering and emerging AI/ML integration. The Role As a Senior Software Engineer, you will contribute to the design and build of robust digital and data services, while enabling the integration of AI/ML capabilities into core platforms. You'll work closely with data engineers, data scientists and product teams to ensure models and analytics solutions are production-ready, scalable and secure....

Company Description General Dynamics Mission Systems engineers a diverse portfolio of high technology solutions, products and services that enable customers to successfully execute missions across all domains of operation. With a global team of more than 13,000 top professionals, we partner with the best in industry to expand the bounds of innovation in the defence and scientific arenas. In the UK, we are leading the way in avionics and communication systems. Given the nature of our work and who we are, we value trust, honesty, alignment and transparency. General Dynamics in St Leonards-on-Sea currently provide avionic mission computing systems for a wide range of military fast jets, helicopters, and UAV’s. Recent success has resulted in General Dynamics developing the next generation of Advanced High Performance, Safety Critical Mission Computer Systems to meet the needs of latest platforms in development by several aircraft manufacturers. These Mission...

Senior C# Developer - Commodities Trading - Outside IR35 Exciting opportunity for an experienced senior developer to build on their experience in Commodities or similar trading development role in this successful Commodities Trading company. £750 - 800 per day Outside IR35 The Senior C# Developer will have significant prior experience as a Senior Software Engineer/Senior Developer working as C# Developer in a Commodities trading environment where they will have gained knowledge of the full trade life cycle and feel comfortable speaking directly to traders and senior stakeholders in the business as well as senior technical colleagues such as architects. Central London location, with Hybrid working expected. Very strong core skills in C# are expected Good knowledge of Commodities Trading is also required. Please apply now if your curious to learn more, for a confidential discussion about the role and company Guidant, Carbon60, Lorien & SRG - The Impellam Group...

Senior Fullstack (React/Python) Engineer contract – Outside IR35 Up to £500 p/day Outside IR35 Location: Fully remote working (must be UK based) Senior Software Engineer (React/Python) - would you like the opportunity to work for a leading Tech for good organisation? They’re currently hiring 2x Senior Software Engineers, where you will be joining a high-performing and dynamic team. You will play a crucial role in the entire lifecycle of their web applications, from initial design and development to ongoing maintenance and improvement As a Senior React/Python Engineer, you will get a lot of responsibility and have a significant impact on their products, while also having the opportunity to mentor junior members of the team. Key requirements: Strong experience with Python Experience with Flask or Django would be a huge bonus. Hands-on experience with cloud platforms (AWS, GCP or Azure). Expert in a modern JavaScript framework, ideally React, but happy to...

Contractor | Fully Remote | UK-Based | OTE: GBP 7,000/month (base + commission) Company Overview MobiLoud helps established ecommerce brands turn their existing websites into fully native iOS and Android apps — without rebuilding their product or managing two separate systems. We work with serious ecommerce businesses: brands with real traffic, real customers, and a genuine need for a direct mobile channel they actually own. Our customers use MobiLoud to improve retention, drive repeat purchases, and cut their dependence on paid acquisition and third-party platforms. We're a bootstrapped, profitable, remote-first SaaS company founded in 2013, headquartered in the UK. Our team is 15 people, all remote, all hands-on, all trusted to work independently. The Role You'll own the full sales conversation from first contact through to a clear buying decision. You'll speak with ecommerce brands actively evaluating whether a mobile app makes sense for their business —...

Senior GraphQL Engineer (GraphQL Federation) to design, build and scale high-performance GraphQL APIs in a modern TypeScript/Node.js stack, deployed to Kubernetes in a cloud-native environment. This is an ideal contract for a GraphQL specialist who loves clean schemas, resilient services, and production-grade delivery. The Role (Key Responsibilities) Own end-to-end GraphQL API delivery : schema design through to production integration, focusing on performance, maintainability, security, and scalability . GraphQL Federation expertise : design and implement supergraphs, subgraphs, resolvers , and governance patterns (versioning, evolution, backward compatibility). Build and maintain TypeScript + Node.js backend services , integrating with modern frontends and varied data sources. Apply DevOps best practices: CI/CD pipelines (Jenkins, Concourse), Docker , Helm , Kubernetes , and YAML-based deployments. Work in an Agile engineering environment:...

Senior GraphQL Engineer (Federation) - TypeScript | Node.js | Kubernetes - Contract (Outside IR35) Location: West London (Hybrid - 2 days/week on-site) Contract: 6 months initial (extensions highly likely) Start: ASAP Eligibility: UK-based candidates only Rate: Market rates (Outside IR35) We're hiring a Senior GraphQL Engineer (GraphQL Federation) to design, build and scale high-performance GraphQL APIs in a modern TypeScript/Node.js stack, deployed to Kubernetes in a cloud-native environment. This is an ideal contract for a GraphQL specialist who loves clean schemas, resilient services, and production-grade delivery. The Role (Key Responsibilities) Own end-to-end GraphQL API delivery : schema design through to production integration, focusing on performance, maintainability, security, and scalability . GraphQL Federation expertise : design and implement supergraphs, subgraphs, resolvers , and governance patterns (versioning,...

Senior C# Software Engineer (Contract) Location: London (Hybrid) Rate: £500 per day IR35 Status: Outside IR35 Duration: 6 Months (Initial) The Opportunity Join a high-performing engineering team within a London-based powerhouse that is currently dominating its sector. This company has moved past the startup phase into a period of sophisticated, sustainable growth, and they are now maturing their global platform to be truly cloud-agnostic. This role is perfect for a Senior Engineer who thrives on architectural variety. You won’t just be maintaining a single environment; you will be building high-throughput systems that leverage the best features across AWS, Azure, and GCP . The Role As a Senior C# Engineer, you will lead the development of mission-critical services that form the backbone of a rapidly scaling infrastructure. Your focus will be: Backend Development: Writing clean, testable, and high-performance code using the latest...

Senior Automation QA Engineer - 6 Month Initial Contract - West Midlands - Outside IR35 VIQU are supporting a growing UK-based software provider within who are seeking a Senior Automation QA Engineer (hands-on) to strengthen their product engineering capability. This role is focused on increasing automation capability and delivery velocity within a scaling development environment click apply for full job details

Join Us at SRT Marine Systems as a Senior Java Developer (Performance Engineer) Job Title: Senior Java Developer (Performance Engineer) Location: Hybrid - 1 day / week in Cardiff office Job Type: Contract, Full-Time Duration: 3 months initially Status and Rate: Outside of IR35, day rate. SRT Marine Systems plc (SRT) are a market leader in its domain of international marine surveillance technology and systems. We are respected, established and an ambitious multi-national company headquartered in the UK with a global customer base. The company has a global impact in the marine domain by leading the next generation of maritime domain awareness technologies, products and systems that significantly enhance, security, safety and environment protection and sustainability. Our customers are worldwide and range from the largest national coast guards to individual vessel owners. SRT is an exciting company where high quality results are rewarded. We are ambitious and are...

Senior Automation QA Engineer – 6 Month Initial Contract – West Midlands – Outside IR35 VIQU are supporting a growing UK-based software provider within who are seeking a Senior Automation QA Engineer (hands-on) to strengthen their product engineering capability. This role is focused on increasing automation capability and delivery velocity within a scaling development environment. The successful Senior Automation QA Engineer will be embedded alongside developers, contributing directly within the C# codebase and enhancing existing automation frameworks. The Role: Build, enhance and maintain automation frameworks using C# and Selenium Develop robust automated UI and API tests across complex enterprise applications Work closely with developers to embed quality within the SDLC Leverage AI-assisted tools such as Copilot to improve automation efficiency and output Create and execute SQL queries for backend validation and data-driven testing Integrate...

Senior Automation QA Engineer - 6 Month Initial Contract - West Midlands - Outside IR35 VIQU are supporting a growing UK-based software provider within who are seeking a Senior Automation QA Engineer (hands-on) to strengthen their product engineering capability. This role is focused on increasing automation capability and delivery velocity within a scaling development environment. The successful Senior Automation QA Engineer will be Embedded alongside developers, contributing directly within the C# codebase and enhancing existing automation frameworks. The Role: Build, enhance and maintain automation frameworks using C# and Selenium Develop robust automated UI and API tests across complex enterprise applications Work closely with developers to embed quality within the SDLC Leverage AI-assisted tools such as Copilot to improve automation efficiency and output Create and execute SQL queries for Back End validation and data-driven testing Integrate...

Senior Automation QA Engineer - 6 Month Initial Contract - West Midlands - Outside IR35 VIQU are supporting a growing UK-based software provider within who are seeking a Senior Automation QA Engineer (hands-on) to strengthen their product engineering capability. This role is focused on increasing automation capability and delivery velocity within a scaling development environment. The successful Senior Automation QA Engineer will be embedded alongside developers, contributing directly within the C# codebase and enhancing existing automation frameworks. The Role: Build, enhance and maintain automation frameworks using C# and Selenium Develop robust automated UI and API tests across complex enterprise applications Work closely with developers to embed quality within the SDLC Leverage AI-assisted tools such as Copilot to improve automation efficiency and output Create and execute SQL queries for backend validation and data-driven testing...

C# | .NET | Azure | Docker | Kubernetes | Microservices | Hybrid | £750pd | Outside IR35 One of our leading clients in the Energy Trading space is looking for a software engineer to join there team building new features across their trading suite. They are looking for a Senior .NET Engineer who is strong working in backend systems, as well as being comfortable building and maintaining pipelines using CI/CD, Docker and Kubernetes. The reason for the additional headcount is due to the client heavily investing in new emerging commodities markets, you will be joining a squad of senior engineers, so for this role you do not need to have previous energy trading experience. However if you do this would be advantageous. Contract Details: 6 months rolling contract Outside IR35 Hybrid - 3 days a week onsite in London Up to £750 per day Tech Stack: C# .NET Azure / AWS (the client is cloud agnostic) Docker / Kubernetes / AKS CI/CD Microservices If...