19 of 19 Contract Senior Software Engineer Jobs

Senior Software Engineer Java/JavaScript/Geospatial £(Apply online only) per day, Outside IR35 Initial 6 month Contract Fully Remote (Must be based in UK) Our exclusive Consultancy partner urgently requires the services of 4 Senior Software Developers to join a project team, delivering services for a high profile Government customer. No SC Clearance … is required, however experience working in the Public Sector is desirable. Skills & Experience needed: A Senior software Developer with experience of leading front and back-end development. The Senior software Developer must be experienced in using of Java, at least one of these Software Developers must have experience of Delphi, and they must have knowledge … or be able to demonstrate sufficient knowledge of similar tools to adopt these quickly. It is desirable that the candidate will also have experience of Postgres/PostGIS. The Senior Software Developer must be able to pick up existing codebases, and improve/amend them, as well as develop and implement new features. They must be comfortable turning More ❯

Senior Software Engineer (MongoDB/Django) 6-Month Contract Outside IR35 Fully Remote About the Role Were looking for a Senior Software Engineer with deep expertise in MongoDB to help solve complex integration challenges between Django and MongoEngine within a live production environment. This is a hands-on engineering role, suited to someone who … engineers on effective MongoDB usage patterns and integration strategies. Help evolve internal tooling, libraries, and data access layers to streamline development. What Were Looking For Proven experience as a Senior Software Engineer with a strong focus on backend systems and database design. Advanced MongoDB knowledge schema design, aggregation pipelines, performance tuning, replication, and indexing strategies. Strong experience More ❯

Do you have a passion for enabling developer 'flow' and building lightning-fast build experiences? We are seeking an experienced and collaborative Senior Software Engineer to drive the next generation of developer tooling as we build a unified, robust, and scalable monorepo ecosystem . Role: Senior Software Engineer Experience: 8+ years Location: Fully remote More ❯

Job title: Senior Software Engineer Location: Full Remote (Very occasional travel to offices in Cheshire) Type: Contract/Outside IR35/6 months initial duration + possible renewals About the Role We re looking for Senior Software Engineers to join our client's dynamic Engineering team and play a key role in building high-quality … scalable software solutions. As a senior member of the team, you ll take ownership of full-stack development, contribute to software architecture, drive engineering best practices, and mentor junior team members. You ll work closely with Product Owners, Architects, and DevOps to ensure delivery excellence across a diverse range of projects. What You'll Be Doing Software … SQL for efficient data management Apply design patterns like OOP, SOLID, and Clean Code to write scalable code Engineering & Architecture Deliver high- and low-level estimations for projects Ensure software quality through unit and integration testing Perform code reviews and participate in pair programming Architect scalable, secure systems, including OAuth and SSO integrations Cloud & DevOps Deploy and manage apps More ❯

Job title: Senior Software Engineer Location: Full Remote (Very occasional travel to offices in Cheshire) Type: Contract/Outside IR35/6 months initial duration + possible renewals About the Role We’re looking for Senior Software Engineers to join our client's dynamic Engineering team and play a key role in building high-quality … scalable software solutions. As a senior member of the team, you’ll take ownership of full-stack development, contribute to software architecture, drive engineering best practices, and mentor junior team members. You’ll work closely with Product Owners, Architects, and DevOps to ensure delivery excellence across a diverse range of projects. What You'll Be Doing Software … SQL for efficient data management Apply design patterns like OOP, SOLID, and Clean Code to write scalable code Engineering & Architecture Deliver high- and low-level estimations for projects Ensure software quality through unit and integration testing Perform code reviews and participate in pair programming Architect scalable, secure systems, including OAuth and SSO integrations Cloud & DevOps Deploy and manage apps More ❯

Senior Oracle APEX Software Engineer (SC Cleared) Bristol, Leicester, or Plymouth (2 days per week onsite) 425 - 525 per day (Inside IR35) 6-month contract Must hold live & transferrable SC clearance ( used within the last 12 months) The Opportunity We're seeking an experienced Senior Oracle APEX Software Engineer to play a key role … to national security and the safety of those at sea. The Role As part of the Digital Solutions Team, you'll be responsible for designing, developing, and maintaining complex software applications that underpin through-life engineering support for the Royal Navy's submarine fleet. You'll take a lead role in requirement analysis, solution design, and efficient software More ❯

Senior Oracle APEX Software Engineer (SC Cleared) Bristol, Leicester, or Plymouth (2 days per week onsite) £425 - £525 per day (Inside IR35) 6-month contract Must hold live & transferrable SC clearance ( used within the last 12 months) The Opportunity We're seeking an experienced Senior Oracle APEX Software Engineer to play a key role … to national security and the safety of those at sea. The Role As part of the Digital Solutions Team, you'll be responsible for designing, developing, and maintaining complex software applications that underpin through-life engineering support for the Royal Navy's submarine fleet. You'll take a lead role in requirement analysis, solution design, and efficient software More ❯

Senior Oracle APEX Software Engineer (SC Cleared) Bristol, Leicester, or Plymouth (2 days per week onsite) £425 - £525 per day (Inside IR35) 6-month contract Must hold live & transferrable SC clearance ( used within the last 12 months) The Opportunity We're seeking an experienced Senior Oracle APEX Software Engineer to play a key role More ❯

Job: Senior Software Engineer Company: BAE Systems Hourly Rate: £50.79 PAYE or £68.55 Umbrella Location : Portsmouth - hybrid Contract : 12 months (Opportunity to be extended) Working Hours : 37 hours per week Key Responsibilities : Supporting the maintenance and further development and enhancement of multiple software systems within the Autonomy group. Designing, reviewing, developing, testing, documenting, configuring and delivering … software products to the agreed standards and procedures using the specified tools. Testing software products sufficiently to ensure software product quality is maintained and minimal or no re-work is required. Investigating and resolving obsolescence issues and problems raised during any stage of the development lifecycle, including software and system integration, qualification, and in-service trials. … Communicating effectively, identifying early potential risks, seeking clarification and providing feedback to the software and integration lead. Skills & Qualifications : Extensive knowledge of programming languages, Object Oriented programming and design patterns with a minimum of 5 years of C++ experience Minimum of 10 years software development experience. Understanding of UML or similarly high level design methodology. Understanding of the More ❯

Senior Software Engineer (Blockchain) Limerick (great hybrid working options) Long Term Contract, very competitive rates We’re helping build a cutting-edge engineering team to design and deliver blockchain-powered platforms and distributed systems for global-scale use cases. This is a hands-on, innovation-driven role working in a small, highly skilled squad exploring the next … and productionise new services Work in fast-paced Agile squads with product & research partners Shape architecture and technical direction from day one Turn emerging tech concepts into real-world software Your Experience 5+ years professional engineering experience Strong Node.js/Java experience Exposure to Go/Rust is nice to have Experience with Angular/React is nice to More ❯

Contract Senior Embedded Software Engineer Avanti Recruitment is working with a leading technology company that designs and develops high-performance electronic systems used in real-world, mission-critical environments. The business is expanding its engineering capability to deliver the next generation of smart instrumentation products where precision, speed, and reliability are essential. You will take ownership across … the full software development lifecycle. This includes architecture, implementation, integration, and testing of embedded systems that meet exacting performance and safety requirements. You will be expected to attend the office three days per week. Core Tech • Embedded C • 16/32-bit microcontrollers • RTOS • Communication protocols: SPI, I2C, TCP/IP • Firmware for peripherals (UART, SPI, I2C, etc.) If … you are an experienced Embedded Software Engineer seeking your next contract and available to start soon, please apply online today. More ❯

Location London Hybrid 1-2 days a week in the office eligibility to work in the UK Role Overview We are seeking a skilled Senior Developer to join a newly formed engineering team focused on removing legacy components and addressing technical debt within our Media Services products. This role will involve working closely with stakeholders to understand system requirements … component migrations. A proactive and detail-oriented approach will be vital to ensure smooth transitions from legacy systems to scalable, reliable, and future-proof solutions. In addition, experience with software testing practices, Agile methodologies (Scrum or Kanban), and defensive programming techniques will be highly desirable. We are looking for someone who thrives in collaborative, fast-paced teams, who can … Go programming experience Agile/Scrum experience Load Balancer experience Defensive programming techniques Tools and Technology Java Jira AWS TDD CI/CD Experience A degree in Computer Science, Software Engineering, or a related field or similar work based experience. Proven experience as a Senior Software Engineer ideally with a focus on media-related projects. Very More ❯

Senior iOS Software Engineer - £400- Inside IR35 - Hybrid - Manchester RecOps is partnered with one of the world's largest broadcasters to bolster their existing engineering team with a Senior iOS Software Engineer. This role would be £400 per day, inside IR35 & would be hybrid with one to two days expected in Manchester. Skills/Knowledge More ❯

Senior Software Developer - Ruby 12-Month Contract Inside IR35 Role Details Location: London or Manchester (2 days/week onsite + monthly team rotation) Duration: 12 months Clearance: BPSS to start; active SC required due to timescale of the project Team: 10 direct reports, part of a 60+ programme Experience: 4+ years Essential Skills Technical: Strong Ruby development … and open data platforms Ensure code is high-quality and well-documented Work closely with UCD teams and technical experts in an agile environment What We're Looking For: Senior Ruby developer with strong focus on code quality Experience working with data services Comfortable working in small, agile teams and collaborating with UCD teams Desirable Skills: Python development Experience More ❯

Senior Software Developer - Ruby 12-Month Contract Inside IR35 Role Details Location: London or Manchester (2 days/week onsite + monthly team rotation) Duration: 12 months Clearance: BPSS to start; active SC required due to timescale of the project Team: 10 direct reports, part of a 60+ programme Experience: 4+ years Essential Skills Technical: Strong Ruby development … and open data platforms Ensure code is high-quality and well-documented Work closely with UCD teams and technical experts in an agile environment What We're Looking For: Senior Ruby developer with strong focus on code quality Experience working with data services Comfortable working in small, agile teams and collaborating with UCD teams Desirable Skills: Python development Experience More ❯

Job Title: Senior Engineer with Node.js and Python or Back End (Java and ideally Kafka) Max rate: £537/Day on Umbrella Location: Croydon (Hybrid) Clearance required: SC Transfer (Active SC only ) Contract Duration: 05 months Experience of Java Experience of Spring framework or equivalent. Knowledge of software design patterns and when to apply them Excellent knowledge … Experience of containerisation using Docker or Kubernetes Experience of Continuous Integration (CI) and Continuous Delivery (CD) A passion for delivering quality code, by use of TDD and setting high software quality standard We're also using the following technologies and patterns, it would be great if you had some of the skills, if not we can help develop them More ❯

Senior Full Stack/Backend Developer (Contract – AI-First) We’re seeking an AI-first Senior Full Stack or Backend Developer to play a key role in shaping the backend of our next-generation B2C platform. You’ll work closely with our front-end team to design and deliver robust, scalable APIs and infrastructure that power our consumer … microservices architecture. Contract: Full-time, initial term 3–6 months Start: ASAP Location: Liverpool - Hybrid To apply, please send your CV, AI tool usage examples, day rate, and references. Senior Full Stack/Backend Developer (Contract – AI-First More ❯

C++ Video Streaming Engineer (Contract) Location: London (Hybrid - 2 days onsite per week) Duration: 6 months Pay Rate: £250-£300 per day A Day in the Life Join our multidisciplinary team to push the limits of Real Time video technology in the medical device space. You'll: Design, implement, and optimise live streaming capabilities into existing software-based … video pipelines. Leverage hardware acceleration to build high-performance, low-latency video capture, processing, AI inference, visualization, and streaming software. Develop robust and secure-by-design software for a regulated environment. Maintain code quality, reliability, and performance , participating in peer reviews and continuous improvement. Must Haves ? Expertise in WebRTC live video streaming development. ? Strong experience with software video More ❯

Must-Have (Non-Negotiable): 10+ years of professional software engineering experience, with 5+ years in Go. Proven ability to solve complex problems end-to-end, not just implement tickets. Deep understanding of Go’s concurrency model (goroutines, channels, memory model). Strong grasp of computer fundamentals: memory, CPU, I/O. Experience with distributed systems, APIs, and cloud-native More ❯