42 software engineer jobs found

Senior Software Engineer Broad Oak Based £68.55 an hour Umbrella Inside IR35 12 Month Contract initially. This is a great opportunity to work within one of the UK's leading Defence organisations based In Broad Oak. Typical duties include (but are not limited to): - Design and development of embedded software entities, from specification through to release into service - Support to electronic circuit designers for computing architecture aspects - Architecture design and coding of complex software problems including, but not limited to, digital signal processing, TCP/IP, data recording solutions - Translation of requirements into design detail - Undertake design review activities at various levels - Support other software engineers as appropriate - Specification of bespoke procured items (e.g. procured IP) - Verification of components and sub-systems using a combination of simulation, analysis, test, and assurance techniques - Maintenance of existing designs...

Software Engineer - Active SC, Java, Microservices Up to £550 per day (Inside IR35) London / Remote 6 months My client is an instantly recognisable consultancy who require a strong Software Engineer with Active Security Clearance (SC) and with deep expertise in Java (Spring Boot) to join a large-scale, business‑critical microservices programme. Key Requirements: Proven experience working as a Java Software Engineer on large microservice architectures Active Security Clearance (SC) Strong capability building scalable RESTful APIs and backend services in Java (Spring Boot): Postgres (or other relational SQL databases) with solid understanding of schema design and SQL Docker: Confident containerising and deploying applications Test‑Driven Development (JUnit & Mockito or similar testing frameworks) CI/CD: Hands‑on experience with Jenkins or similar automated pipeline tooling Flexibility working in agile teams and collaborating closely with engineers, product, and design...

Contract Software Engineer (DV Cleared) 6 Months (Initially) Romsey OR Gloucester for On-site Work €(Apply online only) per day (Inside IR35) iO Associates is proudly partnering an R&D client, specialising in developing cutting-edge technology for our National Security. We are looking for a Software Engineer who holds a current DV clearance to join the team on an Initial 6 month basis (with a high likelihood of extension). The role itself will involve designing, developing and optimising OpenCPI components and application for SIGINT and RF Systems. Along with the additional tasks below: Integrate OpenCPI solutions onto FPGA-based and embedded SDR platforms. Support system architecture, trade studies, and technical design decisions. Ensure robust, scalable and reusable OpenCPI-based implementations.Key Responsibilities Involve: Engineering & Development Develop OpenCPI workers and containers in C/C++ and HDL (VHDL/Verilog where required). Integrate DSP chains...

Senior Software Engineer x 2 Portsmouth £68.55 Inside IR35 12 month contract About the Role We are seeking 2 highly skilled and motivated Senior Software Engineers to join a growing engineering team. This is an opportunity to work on mission-critical systems that support national security, advanced defence platforms, and next-generation technologies. As a senior member of the team, you will play a key role in designing, developing, and delivering high-integrity software solutions within a secure and collaborative environment. What you'll be doing: Designing, reviewing, developing, testing, documenting, configuring and delivering software products to the agreed standards and procedures using the specified tools, within schedule and estimates Resolving the complex challenges, issues and faults associated with installation, commissioning, operation and performance of systems Providing specialist technical advice and guidance to other professionals, technician engineers and/or...

Senior Software Engineer x 2 Portsmouth (Hybrid working) £68.55 Inside IR35 12 month contract About the Role We are seeking 2 highly skilled and motivated Senior Software Engineers to join a growing engineering team. This is an opportunity to work on mission-critical systems that support national security, advanced defence platforms, and next-generation technologies. As a senior member of the team, you will play a key role in designing, developing, and delivering high-integrity software solutions within a secure and collaborative environment. What you'll be doing: Designing, reviewing, developing, testing, documenting, configuring and delivering software products to the agreed standards and procedures using the specified tools, within schedule and estimates Resolving the complex challenges, issues and faults associated with installation, commissioning, operation and performance of systems Providing specialist technical advice and guidance to other professionals, technician...

DV Cleared Software Engineer (DBA / Data-Focused) Contract: 12 months Location: Cheltenham (5 days per week onsite, occasional travel to Gloucester) Rate: £600 - £750 per day (Umbrella, Inside IR35) UK Eyes only Must hold live UKIC DV clearance used within the last 12 months About the Role An exciting opportunity has arisen for an experienced Software Engineer with a strong DBA background to support a growing national security programme based in Cheltenham. This role sits within a high-performing technical team delivering solutions that have real-world impact across the UK Government sector. You'll work on data-focused systems, contributing across the full software lifecycle while supporting and improving secure Oracle-based platforms and automation using Ansible. Key Responsibilities Design, develop, test, document and support software components within a secure system environment Provide accurate estimates for development effort from given specifications Work with a...

Software Engineer II Hybrid: Manchester (1 day a week) Inside IR35: £500 Duration: 6 months Tech Stack: Java / Spring Boot, SQL Server, AWS, Kubernetes, CI/CD. Node.js/Python and SSIS experience is a bonus. A technology‑driven team is seeking an experienced Software Engineer II to support the design, build and operation of backend services within a financial data environment. This role is ideal for someone who values strong engineering practices, autonomy, and cross‑functional collaboration. You will help develop and operate backend systems that deliver accurate, timely financial data to critical enterprise processes. The role includes hands-on development, production support, and ensuring compliance with key regulatory frameworks such as SOX and GDPR/PII. Java / Spring Boot Python & Node.js Microsoft SQL Server, SQL optimisation SSIS (bonus) AWS Kubernetes, Docker CI/CD tooling Infrastructure as Code (TypeScript, AWS CDK) Exposure to Apache Spark is a plusIf this sounds...

World Class Defence Organisation is currently looking to recruit 5x C# / C++ Software Engineer subcontractors on an initial 12 month contract.  Desktop C# is the expertise the department are looking for; with some experience with C++ but doesn’t need to be overly extensive. Job Title: C# / C++ Software Engineer Rate: £65.00 per hour Overtime Rate: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Location: Stevenage or Bristol (depending on your preference) Hybrid / Remote working: The role will be a hybrid role of 3 or 4 days per week onsite Contract: 37 Hours per week Duration: 12 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) C# / C++ Software Engineer Job Description: WSSE are integral in the development of weapon systems and system architectures, and as a result we have developed a capability supporting developments across the full product life cycle.   The team integrate real products, models...

World Class Defence Organisation is currently looking to recruit 5x C# / C++ Software Engineer subcontractors on an initial 12 month contract.  Desktop C# is the expertise the department are looking for; with some experience with C++ but doesn’t need to be overly extensive. Job Title: C# / C++ Software Engineer Rate: £65.00 per hour Overtime Rate: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Location: Stevenage or Bristol (depending on your preference) Hybrid / Remote working: The role will be a hybrid role of 3 or 4 days per week onsite Contract: 37 Hours per week Duration: 12 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) C# / C++ Software Engineer Job Description: WSSE are integral in the development of weapon systems and system architectures, and as a result we have developed a capability supporting developments across the full product life cycle.   The team integrate real products, models...

World Class Defence Organisation is currently looking to recruit a Java Software Engineer subcontractor on an initial 12 month contract.     Job Title: Java Software Engineer Rate: £65.00 per hour Location: Bristol Hybrid / Remote working: The role will be onsite – a compressed 4 day week (Monday to Thursday is fine) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 12 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella)                                                                                                                                           Interview Process: One stage Video Interview Java Software Engineer Job Description: The team, at the Bristol facility, develop solutions for the next generation of Air Defence Systems; developing evolving products whilst maintaining their enviable reputation for safety, performance and dependability. This...

World Class Defence Organisation is currently looking to recruit a Java Software Engineer subcontractor on an initial 12 month contract.    Job Title: Java Software Engineer Rate: £65.00 per hour Location: Bristol Hybrid / Remote working: The role will be onsite – a compressed 4 day week (Monday to Thursday is fine) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 12 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella)   Java Software Engineer Job Description: The team, at the Bristol facility, develop solutions for the next generation of Air Defence Systems; developing evolving products whilst maintaining their enviable reputation for safety, performance and dependability. This is a very hands-on role and requires the continued design and development of new and evolving software tools and architectures, and the instantiations for future products. Perfect...

World Class Defence Organisation based in Bristol is currently looking to recruit an Algorithm Software Engineer 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: £65.00 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: Work alongside algorithm engineers and technical expert to transcode a large, complex legacy algorithm codebase from ADA to Matlab As part of a wider team, define, distribute and review core activities to enable efficient completion of the transcoding within project...

World Class Defence Organisation is currently looking to recruit 5x Embedded Software V&V Engineer subcontractors on an initial 6 month contract.  Skills in C, C++ or ADA are beneficial.  A defence or aerospace industry background would also be great.   Rate: £70.00 per hour Location: Stevenage or Bristol, depending on your preference. Hybrid / Remote working: Full time on site (occasional work from home day) (The company are happy with a 4 day week) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Interview process: 1 stage video interview   Embedded Software V&V Engineer Job Description:   The department create the complex, highly reliable real-time software that powers missile systems and their components, ensuring that they provide the performance and functionality our users require when they...

World Class Defence Organisation is currently looking to recruit 5x Embedded Software V&V Engineer subcontractors on an initial 6 month contract.  Skills in C, C++ or ADA are beneficial.  A defence or aerospace industry background would also be great.   Rate: £70.00 per hour Location: Stevenage or Bristol, depending on your preference. Hybrid / Remote working: Full time on site (occasional work from home day) (The company are happy with a 4 day week) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Interview process: 1 stage video interview   Embedded Software V&V Engineer Job Description:   The department create the complex, highly reliable real-time software that powers missile systems and their components, ensuring that they provide the performance and functionality our users require when they...

World Class Defence Organisation is currently looking to recruit a remote PERL Software Engineer subcontractor on an initial 6 month contract. Job Title:  PERL Software Engineer Rate: £77 - £84 per hour Location: Stevenage Hybrid / Remote working: This role is a remote based role – with just 1 visit to the Stevenage site per month. Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) PERL Software Engineer Job Description: The Software department are looking for a software developer with experience in the PERL programming language. We require someone who can create and update text-based templates used in Technical Publications authoring and publishing tasks. Knowledge of the Technical Publications publishing process would be an advantage but not a requirement. Assistance in updating and in some cases,...

Rullion are looking to recruit for the following role: Electronics Engineer Start : 1st May 2026 12 month contract Location : Oxford Inside IR35 PAYE £46 Per hour /£59 Per hour Umbrella. 7.5 hours per day 37.5 hours per week Power Supply & Power Electronics Design Design and develop high-current, high-stability power supplies for superconducting magnets and related systems Design linear and switch-mode power converters (DC/DC, AC/DC, current-regulated supplies) Develop precision current regulation and control loops with excellent stability and low ripple Perform detailed control-loop analysis (Bode plots, phase margin, transient response) Design protection circuits (over-current, over-voltage, ground fault, quench-related protection) Select power semiconductors (IGBTs, MOSFETs, diodes), magnetics, and passive componentsMagnet System Support Support powering, ramping, and steady-state operation of superconducting magnets Understand magnet load characteristics,...

Test Design Engineer Location: Glasgow, Cheadle, Crawley, Templecombe  Duration: 6 months Rate: £61.84 ph Umbrella Inside IR35 SC Clearance required We are looking for Labview Test Design Engineers who have experience in working with development project teams to develop and deliver test solutions. This can range from a simple test box through to complex fully automated solutions and will require involvement throughout the lifecycle of the solution from concept to completion. You will have an opportunity to influence product design requirements, develop equipment for both product verification and manufacturing phases, and introduce new technologies and ways of working. Each successful candidate will have demonstrable experience of Test Solution Engineering and will ideally have experience interfacing with external customers as well as internal stakeholders. The candidate should be able to demonstrate knowledge in some or all of the following key areas: Specifying,...

Principal Digital Electronics Engineer 12 months £84.55 per hour (inside IR35) Hybrid working About the Opportunity We are seeking a Principal Digital Electronics Engineer to help deliver advanced electronic solutions across some of the most complex and high-profile defence and security programmes in the UK. This is a technical leadership role where you will shape digital hardware architectures, influence system-level design decisions, and mentor engineers across the full product lifecycle - from concept through to production and in-service support. What You'll Be Doing Lead the architecture, design and development of complex digital electronic systems Define and review FPGA, SoC, and high-speed digital designs Oversee requirements capture, design documentation, and verification strategies Provide technical authority and governance across multiple projects Support system integration, validation, and qualification activities Collaborate with systems, software, firmware,...

Principal Digital Electronics Engineer 12 months £84.55 per hour (inside IR35) Hybrid working (Portsmouth) About the Opportunity We are seeking a Principal Digital Electronics Engineer to help deliver advanced electronic solutions across some of the most complex and high-profile defence and security programmes in the UK. This is a technical leadership role where you will shape digital hardware architectures, influence system-level design decisions, and mentor engineers across the full product lifecycle - from concept through to production and in-service support. What You'll Be Doing Lead the architecture, design and development of complex digital electronic systems Define and review FPGA, SoC, and high-speed digital designs Oversee requirements capture, design documentation, and verification strategies Provide technical authority and governance across multiple projects Support system integration, validation, and qualification activities Collaborate with systems,...

On behalf of our client, we are seeking to recruit a Building Services Engineer on an initial 12 -month contract. As the Building Services you will be overseeing and inspecting building services installations (Mechanical, Electrical, and Fabric) on our projects to ensure they meet the highest standards of quality, compliance, and design specifications. Role: Building Services Engineer Pay: Up to £40 per hour Via Umbrella Location: Portsmouth or Stevenage Contract: Monday - Friday 37 hours per week, 12 months IR35 Status: Inside Security Clearance: Must be able to achieve Security Clearance, UK eyes only project Responsibilities Site Inspection & Quality Assurance: Conduct regular, thorough site inspections of all building services and building installations (HVAC, plumbing, electrical, fire systems, controls, structure etc.) to ensure compliance with drawings, specifications, statutory regulations (e.g., Building Regulations, Health & Safety), and industry best...