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Contractor 149
software engineer

149 software engineer jobs found

CL
Jul 26, 2026  
Software Engineer
Java, Golang, REST, Jenkins, Postgres Tiro Partners are looking for 3 contract software engineers to work on a large scale B2C platform with Go/Golang. Demonstrable experience in at least one back-end type safe programming language (Golang Preferred but other experience can be considered) Comfortable/experienced with back-end micro-service architecture and communication, specifically REST and asynchronous messaging services (e.g., Kafka, RabbitMQ etc.) Comfortable/experience within a Scrum framework working with as part of a team to deliver business functions and customer journeys that are tested and automated throughout the CICD pipeline to production. TDD skills desirable. Desired: Bachelors Degree in computer science, computer engineering, or other technical discipline, The role will require 2-3 days per week onsite in Sussex. Immedaite Interviews 1-5 years commerical experience accepted
IR35 Status:
Unknown Status

CV-Library RH15, Burgess Hill, West Sussex Contractor
CL
Jul 26, 2026  
Software Engineer - Displays
Software Engineer - Marine Displays - 6 month contract Our client delivers navigation solutions to commercial and defence maritime operators worldwide. We're looking for a Software Engineer to join our Engineering Department in New Malden, developing the Windows-based display applications that sit on the bridge of vessels around the globe - the interfaces crews rely on for navigation, situational awareness, and safe passage at sea. What you'll be doing: Building and maintaining C# applications that run on marine display hardware - real software, on real ships, doing work that matters Owning full life-cycle development, from design through to field support Diagnosing and fixing issues reported from vessels already in service Working AGILE, with code reviews and close collaboration baked into the process Partnering with System Test teams to get releases right Providing technical leadership and mentoring within the team What you'll bring: 8+ years in software development,...
IR35 Status:
Unknown Status

CV-Library New Malden, London Contractor
CL
Jul 25, 2026  
Software Engineer X3 (Back end)
Software Engineer (Back end) Location: Remote (occasional travel required for workshops and PI Planning events) Contract: 6-month contract, with scope for extension If you're an experienced Software Engineer with strong Python and AWS expertise and enjoy working in Agile teams where you contribute to backlog refinement, ticket refinement, and iterative sprint delivery, we'd love to hear from you. About the Role We are recruiting for an experienced Software Engineer to join a major UK critical infrastructure and energy organisation on an initial 6-month contract, with the potential for extension. You'll be supporting the delivery of innovative digital solutions within a large-scale technology environment that underpins the UK's electricity distribution network. This is a predominantly remote role, with occasional travel required to attend team workshops and PI (Programme Increment) Planning events. Working within an Agile environment, you'll design, develop, and maintain...
IR35 Status:
Unknown Status

CV-Library Warwickshire, UK Contractor
CL
Jul 25, 2026  
Full-Stack Software Engineer
We are seeking three talented Full Stack Software Engineers to join high-performing Agile Scrum teams delivering innovative, business-critical solutions within the Swiss financial services sector. This role offers the opportunity to work on modern, large-scale platforms where your ideas, technical expertise, and ownership mindset will directly influence the products and services delivered to customers. If you enjoy solving complex technical challenges, influencing architectural decisions, and working with modern cloud-native technologies. What You'll Do - As a Full Stack Software Engineer, you will take ownership of features across the full software lifecycle - from concept and architecture through development, deployment, and operations. Your responsibilities will include: Designing, developing, testing, and maintaining modern full-stack applications using Java and contemporary web technologies Taking end-to-end ownership of features and delivering scalable, high-quality...
IR35 Status:
Outside IR35

CV-Library United Kingdom Contractor
CL
Jul 25, 2026  
Software Engineer
Role: Software Location: Cheltenham Duration: 12 months Rate: £75/hour Inside IR35: Umbrella Role Summary As a Software Engineer in the Displays Application team you will be responsible for the design and development of real-time embedded software within an integrated team environment, developing Aircraft Standby Display Systems. You will demonstrate independence & sound technical judgement to execute on assignments, identifying problems and formulating solutions. Essential Responsibilities Execute the requirements, design, implementation and verification of assigned software projects using sound engineering principles and adhering to business standards, practices, procedures and product / program requirements Document technical data generated by the assigned project consistent with engineering policies and procedures Provide timely communications on significant issues or developments Assure proper documentation of technical data is generated for the assigned projects...
IR35 Status:
Inside IR35

CV-Library Cheltenham, Gloucestershire Contractor
CL
Jul 23, 2026  
ADA Software Engineer
Software Engineer ADA Bristol (onsite) Initial 6-month contract £68ph, UMB, inside IR35 SC must be in place prior to starting the contract Overview of department: We're a driven team with a passion for software and its successful deployment in battlespace Command and Control (C2) weapon systems. We work on technology that is at the forefront of European missile system design, delivering safe, secure, and reliable products to our customers. Responsibilities: We are looking for a capable, adaptable and inquisitive Ada software engineer (see expectations below) to join a small talented team to develop middleware solutions for the next generation of advanced missile systems. Developing solutions targeting a large range of problems from hardware drivers to web services. This role provides a great opportunity for someone wanting to be involved in many differing areas of software. Working across multiple applications on both land and maritime projects in the systems software...
IR35 Status:
Inside IR35

CV-Library Bristol, UK Contractor
CL
Jul 23, 2026  
Ada Software Engineer Bristol
Contract Software Engineer ADA required for long term contract assignment in Bristol Skillset/experience required: A solid background in software engineering, ideally with development experience in a regulated software safety context e.g. Defence, Aerospace, Rail, Nuclear or Medical applications. Experience with Ada (preferred) or good experience with C or C++. Whilst this position is for Ada development, we welcome applicants with experience in other software languages such as C, C++ or Rust, as we have found that Ada can be mastered by capable and willing software engineers. A passion for software engineering, with the ability to innovate and think critically to solve complex software problems with a willingness to develop software skillsets. Knowledge of software design differences between Real-Time OSs and Hypervisors would be beneficial, as well as experience using Linux operating systems. Comfortable working with a team in a collaborative environment, communicating and...
IR35 Status:
Unknown Status

CV-Library Bristol, UK Contractor
CL
Jul 23, 2026  
ADA Software Engineer
World Class Defence Organisation based in Bristol is currently looking to recruit an ADA Software Engineer subcontractor on an initial 6 month contract, with very likely extension.  The role will be onsite 4 days per week.  A 4 day working week is OK (Monday to Thursday).   Rate: £68.00 per hour Overtime Rate: Hours worked over the standard 37 hours per week, will be paid at ‘time and a quarter’ Location: Bristol Hybrid / Remote working: The role will be onsite 4 days per week. A 4 day working week is OK (Monday to Thursday).  Duration: 6 Months with very likely extension. Contracts are often ongoing and long-term thereafter.  IR35 status: Inside IR35 (Umbrella) Interview process: One stage video interview   Job Description: We’re a driven team with a passion for software and its successful deployment in battlespace Command and Control (C2) weapon systems. We work on technology that is at the forefront of European missile system design, delivering safe, secure, and reliable...
IR35 Status:
Inside IR35

CV-Library Bristol, UK Contractor
CL
Jul 23, 2026  
Senior / Lead Software Engineer (Python, Django) - Cardiff, UK
Role: Senior / Lead Software Engineer (Python, Django) Type: 12 Months Contract Location: London / Manchester / Birmingham / Cardiff / North East, UK Working Model: Hybrid (2 days per week in Office) Payrate: £600 - £750 per Day on Inside IR35 via Umbrella What You'll Do: Lead end-to-end system design and delivery using Python and Django. Write secure, test-driven code and maintain live service performance. Work in an Agile, multidisciplinary team aligned with Government Digital Service (GDS) standards.What We Need: 5+ years experience (ideally 8-10 years). Deep technical expertise in Python & Django. Proven system design and architecture capabilities. Strong communication and collaborative problem-solving skills.Bonus: Previous experience with GDS standards, the public sector (e.g., MOD, HMRC), or secure defence environments. This is an urgent vacancy with a deadline where the hiring manager is shortlisting for an interview immediately. Please apply with a copy of your...
IR35 Status:
Inside IR35

CV-Library Cardiff, UK Contractor
CL
Jul 23, 2026  
Software Engineer ADA
Software Engineer (Ada / C++) Location: Bristol (Full-Time Onsite) Contract: Initial 6-Month Contract (High chance of extension) IR35 Status: Inside IR35 Rate: Up to £70 per hour We're supporting a leading engineering and technology organisation in the search for a Software Engineer to join their specialist Systems Software team on an initial 6-month contract, with a strong likelihood of extension. This is an exciting opportunity to work on cutting-edge, mission-critical technology programmes, developing software solutions that support some of the most advanced systems currently in operation. You'll join a highly skilled team responsible for delivering reliable, secure and high-performance software across a variety of challenging projects. Key Responsibilities Develop and maintain software solutions for complex systems applications. Design, implement and test middleware and systems software. Work across a broad range of software challenges, from hardware-level drivers...
IR35 Status:
Inside IR35

CV-Library Bristol, UK Contractor
CL
Jul 23, 2026  
Senior/Lead Software Engineer(Python, Django)-Birmingham, UK
Role: Senior / Lead Software Engineer (Python, Django) Type: 12 Months Contract Location: London / Manchester / Birmingham / Cardiff / North East, UK Working Model: Hybrid (2 days per week in Office) Payrate: £600 - £750 per Day on Inside IR35 via Umbrella What You'll Do: Lead end-to-end system design and delivery using Python and Django. Write secure, test-driven code and maintain live service performance. Work in an Agile, multidisciplinary team aligned with Government Digital Service (GDS) standards.What We Need: 5+ years experience (ideally 8-10 years). Deep technical expertise in Python & Django. Proven system design and architecture capabilities. Strong communication and collaborative problem-solving skills.Bonus: Previous experience with GDS standards, the public sector (e.g., MOD, HMRC), or secure defence environments. This is an urgent vacancy with a deadline where the hiring manager is shortlisting for an interview immediately. Please apply with a copy of your...
IR35 Status:
Inside IR35

CV-Library Birmingham, West Midlands Contractor
CL
Jul 23, 2026  
Senior / Lead Software Engineer (Python, Django) - London, UK
Role: Senior / Lead Software Engineer (Python, Django) Type: 12 Months Contract Location: London / Manchester / Birmingham / Cardiff / North East, UK Working Model: Hybrid (2 days per week in Office) Payrate: £600 - £750 per Day on Inside IR35 via Umbrella What You'll Do: Lead end-to-end system design and delivery using Python and Django. Write secure, test-driven code and maintain live service performance. Work in an Agile, multidisciplinary team aligned with Government Digital Service (GDS) standards.What We Need: 5+ years experience (ideally 8-10 years). Deep technical expertise in Python & Django. Proven system design and architecture capabilities. Strong communication and collaborative problem-solving skills.Bonus: Previous experience with GDS standards, the public sector (e.g., MOD, HMRC), or secure defence environments. This is an urgent vacancy with a deadline where the hiring manager is shortlisting for an interview immediately. Please apply with a copy of your...
IR35 Status:
Inside IR35

CV-Library London, UK Contractor
CL
Jul 23, 2026  
Senior/Lead Software Engineer(Python, Django)-Manchester, UK
Role: Senior / Lead Software Engineer (Python, Django) Type: 12 Months Contract Location: London / Manchester / Birmingham / Cardiff / North East, UK Working Model: Hybrid (2 days per week in Office) Payrate: £600 - £750 per Day on Inside IR35 via Umbrella What You'll Do: Lead end-to-end system design and delivery using Python and Django. Write secure, test-driven code and maintain live service performance. Work in an Agile, multidisciplinary team aligned with Government Digital Service (GDS) standards.What We Need: 5+ years experience (ideally 8-10 years). Deep technical expertise in Python & Django. Proven system design and architecture capabilities. Strong communication and collaborative problem-solving skills.Bonus: Previous experience with GDS standards, the public sector (e.g., MOD, HMRC), or secure defence environments. This is an urgent vacancy with a deadline where the hiring manager is shortlisting for an interview immediately. Please apply with a copy of your...
IR35 Status:
Inside IR35

CV-Library Manchester, Greater Manchester Contractor
CL
Jul 22, 2026  
Senior AI Software Engineer (GenAI)
Senior Generative AI Engineer / AI Software Engineer 6 Month Contract (potential to extend) We're looking for a hands on Generative AI Engineer to build, deploy and secure production grade AI applications within a regulated enterprise environment. This is not a research or proof of concept role. We're looking for someone who has delivered real world GenAI solutions and can clearly explain both the concepts and the implementation behind them. Essential Experience Building and deploying production LLM applications Strong experience with RAG including: Document ingestion Chunking strategies Embeddings Vector search and retrieval Context engineering Prompt orchestrationLLM deployment experience, not just experimentation Azure OpenAI, Ollama and/or Vertex AI Python, FastAPI and REST API development LangChain and/or LangGraph AKS, Kubernetes, Docker and Helm Secure AI development and DevSecOps practices including: RBAC Azure AD Key Vault Secrets management Secure deployment...
IR35 Status:
Unknown Status

CV-Library Cardiff, UK Contractor
CL
Jul 22, 2026  
Backend Software Engineer
Backend Software Engineer (Java & Identity Access Management) 7 Months 4 Days per week on site (Basildon) £593.48 per day (Inside IR35) My client in the automotive industry are looking for an experienced Senior Backend Software Engineer to join our Identity Management Services team, focusing on the core platform work that powers our identity infrastructure. In this role, you will design and build high-scale backend services while serving as a technical lead to upskill the team in modern, industry-leading application development. You will be responsible for ensuring the plaatform is secure and resilient, leveraging your deep engineering expertise to elevate the team's technical standards and foster a culture of excellence in backend engineering. OAuth would be very beneficial Skills Required: - Proficiency in Java - Java Framework - Web development - DevOps practices (CI/CD, version control) - Security and identity management - Monitoring and logging - Relational...
IR35 Status:
Inside IR35

CV-Library Basildon, Essex Contractor
CL
Jul 21, 2026  
Senior Software Engineer
Lead Backend Software Engineer – Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700–£800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We're looking for someone who enjoys building from first principles, thrives in ambiguity, and can balance strategic...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Jul 16, 2026  
Embedded Software Engineer
Embedded Software Engineer | Outside IR35 | Cambridge The client is looking for specialist embedded software development services to deliver defined firmware components for an embedded Linux platform. They are looking for multiple software engineers, so I encourage you to apply if you have any recent experience developing software on an embedded Linux platform. Scope of Services * Development of embedded Linux firmware for target hardware platforms (OMAP & iMX6), including kernel configuration, BSP updates, and device driver enablement * Implementation of software required to support platform bring-up and peripheral integration (e.g. UART, SPI, I2C, PCIe) * Integration of firmware into the wider system, ensuring compatibility with existing software components * Investigation and resolution of technical issues relating to firmware, including hardware/software interaction faults * Production of supporting artefacts (design documentation, test specifications, and...
IR35 Status:
Outside IR35

CV-Library Cambridge, Cambridgeshire Contractor
CL
Jun 26, 2026  
Contract C# Software Engineer
Contract C# Software Engineer Near Wimbledon 6-month contract Software Engineer role developing C# Windows applications that interface with hardware. This role is inside IR35 and requires on-site work 3 days per week (full time for the first few weeks). C# Software Engineer skills required - * Good analytical skills and experience of code and design review for large projects. * Experience of multi-threaded and distributed applications, preferably with an understanding network of protocols. * Strong Experience in developing Windows desktop applications in C# * Interfacing with hardware/physical products * .NET environment, Windows Forms, TCP/IP & UDP protocols Please apply or call for more information
IR35 Status:
Inside IR35

CV-Library KT3, Malden, Greater London Contractor
CL
Jun 21, 2026  
Embedded Software Engineer | 6-Month Contract (Outside IR35) | Cambridge
Embedded Software Engineer | 6-Month Contract (Outside IR35) | CambridgeLocation: Cambridge, UK (Onsite) Contract Type: 6 months (Outside IR35) Rate: Competitive (DOE) Responsibilities: Develop embedded software in C (Linux environment) Design, implement, and maintain device drivers Work closely with hardware and systems engineers onsiteRequired Experience: 3+ years’ embedded software development experience Strong C programming skills in Linux environments Experience with device drivers or kernel-adjacent developmentApply: If you're looking for a 6-month Outside IR35 contract in Cambridge, apply with your CV today
IR35 Status:
Outside IR35

CV-Library Cambridge, UK Contractor
CL
Jul 23, 2026  
Lead AI Enabled Software/DevOps Engineer
What You'll Be Doing - Provide technical leadership across AI-enabled software and DevOps engineering teams - Set architectural direction for API-first design, system integration, and platform enablement for AI - Lead the evolution of legacy or existing applications towards modern, service-based and API-driven architectures - Define and guide integration patterns between applications, platforms, and AI services - Make informed decisions on when and how emerging integration approaches (e.g. protocols such as MCP) should be applied as part of broader system design - Work closely with architects, product teams, data scientists, and platform engineers to deliver end-to-end solutions - Ensure solutions meet appropriate standards for security, resilience, performance, and operability - Anticipate and manage architectural and operational risks associated with AI-enabled systems - Champion strong engineering practices across software development, DevOps, and platform engineering...
IR35 Status:
Unknown Status

CV-Library London, UK Contractor
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