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Overview
Find top CONTRACT Firmware Engineer jobs with Haystack – your go-to IT job board for flexible, high-paying firmware engineering contracts. Explore exciting contract opportunities in embedded systems, IoT, and hardware development. Start your next firmware engineering contract role today!
Principal Software Engineer
Morson Edge
Luton
Hybrid
Senior
£58/hour - £79/hour
RECENTLY POSTED

Contract Software Engineer (Ada) Real-Time Embedded

Location: Luton (Hybrid 4 days on-site)
Contract Length: 12 months
IR35: Inside IR35
Rate: £57.72 p/h PAYE (£66.11p/h inc. holiday rate) OR £78.70 p/h Umbrella

We seek an engineer with recent high-integrity or safety-critical industry experience (defence, aerospace, or similar), or eligible for UK security clearance.

The Opportunity

We re looking for an experienced real-time embedded Ada engineer to work on mission-critical defensive systems within a highly technical electronic warfare environment. This is a hands-on role developing, integrating, and testing high-integrity software that directly supports operational capability.

You ll be trusted with complex problems, work closely with systems, hardware, and firmware teams, and play a key role across the full software lifecycle.

What You ll Do

  • Design, develop, debug, and test real-time embedded software in Ada
  • Own complex work packages from requirements through integration and delivery
  • Produce high-integrity, mission-critical software to defined engineering and quality standards
  • Work collaboratively across disciplines while retaining autonomy and technical ownership
  • Support current platforms and contribute to future capability development

What You Bring

  • Expert-level Ada (including OO design principles)
  • Strong experience debugging embedded real-time systems using a COTS RTOS
  • Solid understanding of UML and structured design
  • Deep knowledge of Verification & Validation techniques and when to apply them
  • Experience with requirements engineering, integration, and target testing
  • Comfortable working within a mature, governed development framework
Electronics Design Engineer
Guidant Global
Stevenage
In office
Mid - Senior
£58/hour
RECENTLY POSTED
TECH-AGNOSTIC ROLE

Our client, a key partner to the UK Ministry of Defence, is seeking an experienced Electronics Design Engineer to join a high-performing team developing cutting-edge defence technologies. This role offers the opportunity to collaborate with multidisciplinary experts, drive innovation, and apply best practices to enhance product performance across complex missile systems.

Key Responsibilities:

  • Design and develop advanced electronic solutions for weapon systems, including onboard missile sub-systems and land, sea, and air-based firing units.
  • Ensure product quality and performance standards are met throughout the development lifecycle.
  • Provide accurate cost and schedule updates to the project manager to support effective project tracking.
  • Demonstrate expertise in electronic design from concept through to production, with a strong focus on Power and Analog Electronics at both sub-system and board level.
  • Collaborate cross-functionally with Software, Firmware, Mechanical, Environmental, and EMC teams to ensure design compliance with all technical and regulatory requirements.
  • Contribute to the delivery of high-performance missile solutions that meet client expectations and operational demands.

What do you need?:

  • Possess a degree and significant experience in Electronic Design, development, and delivery after completion qualification.
  • Demonstrate your ability to lead major electronic design projects and show your experience working with a diverse team. Be aware of the challenges that may arise and show your understanding of handling them.
  • Problem-solving skills and in-depth knowledge of various electronic technologies and products.
  • Excellent communication skills, both in writing and speaking, enable me to negotiate and influence stakeholders across the organisation effectively.

What happens now?

Upon submission of your application, should it meet our selection criteria, you will be contacted via e-mail by one of our talent acquisition specialists to arrange a screening call. This telephone chat is structured to explore a series of questions aimed at matching your competencies and capabilities to the specific demands of the position. Please note, this screening is contingent upon the initial success of your application.

Security Clearance:

British Citizen or a Dual UK national with British citizenship

Restrictions and/or limitations relating to nationality and/or rights to work may apply. As a minimum and after offer stage, all successful candidates will need to undergo HMG Basic Personnel Security Standard checks (BPSS), which are managed by our clients Security Team.

More about the role:

Our clients relationship with the UK military spans back over 70 years. They have delivered countless landmarks in defence engineering, supplying vital defence capability to meet the needs of the armed forces over land, sea, and air.

This role is based at their headquarters in Stevenage which plays a key part in missiles operations. The site also offers excellent transportation links and boasts an onsite gym and coffee shop. Training and development are offered to all employees.

Labview Test Design Engineer
Morson Edge
Glasgow
In office
Mid - Senior
£488/day (Negotiable)
RECENTLY POSTED

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, designing and proving software solutions to meet project operational requirements.
  • Proven ability in the design and verification of LabVIEW code, candidates have experience with Small to Medium Scale projects (1-6 Month Development time) in Test Design and LabVIEW Core 1, 2 as a minimum
  • Knowledge of specifying and constructing test sequences using Teststand
  • Knowledge of electronic/electrical design
  • Knowledge of Electronics circuit design
  • Cabling and interconnect design
  • Ability to work to budget and timescale
  • Preparation of test system procurement specifications
  • Testing at circuit board and system level
  • General understanding of design lifecycle

Additional

Due to the sensitive nature of the product all applicants must have worked within the Defence / Military industry within the last 12 months or be capable of obtaining Security Clearance (SC level minimum).

Software Engineer - PLC & SCADA
Line Up Aviation
Motherwell
In office
Mid - Senior
£45/hour - £60/hour
TECH-AGNOSTIC ROLE

We are seeking experienced Software Engineers with strong PLC and SCADA expertise to support cutting-edge defence technology development in Motherwell, Lanarkshire. You’ll join a multi-disciplinary team delivering high-quality software solutions in line with recognised industry standards.

** Please note \ Applicants MUST be a UK passport holder & born in the UK due to the nature of this contract.

Role: Software Engineers - PLC & SCADA Location: Motherwell Contract: 6 months initially but likely to be extended up to 23 months maximum. 37.5 hours per week. Pay rate: £45 - £60 per hour (PAYE only)

Main responsibilities:

  • Develop innovative, high quality software for leading UK defence projects
  • Utilising a variety of tools and programming languages, contribute across the full software lifecycle in a collaborative team
  • Support junior team members and lead in review/assurance activities
  • Design, implement, test, and deploy control system solutions

Ideal candidate profile:

Background in Instrumentation & Control Engineering (or similar) Strong knowledge of PLC programming, SCADA, and DCS systems Candidates MUST be UK passport holders & born in the UK Vetting process will also include 5 years’ referencing & a drug screen

If you are interested in applying for this position and you meet the requirements, please apply immediately.

Due to the number of applications we receive, it’s not always possible to contact unsuccessful applicants. Unless you hear from us within 14 days of your application, please assume that you have been unsuccessful on this occasion. "Follow @LineUpAviation on Twitter for all of our latest vacancies, news and pictures from our busy UK Head Office. Interact with us using the #LineUpAviation tag at anytime! Thank you for your follow

Embedded C / C++ Software Engineer
Certain Advantage
Stevenage
Hybrid
Mid - Senior
£560/day

World Class Defence Organisation based in Stevenage is currently looking to recruit an Embedded C/C++ Software Engineer subcontractor on an initial 6 month contract. Hourly Rate: £70.00ph (Umbrella). Overtime Rate: Hours worked over the standard 37 hours per week, will be paid at time and a quarter Location: Stevenage Hybrid / Remote working: The role will likely be onsite 4 days per week. A 4 day working week is OK (Monday to Thursday). Opportunities for occasional remote working. 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 Embedded C / C++ Software Engineer Job Description: The company is a world leader in missile and missile systems looking for a highly capable and adaptable Engineers to join the Development Facility in Stevenage, Hertfordshire. You will be responsible for developing the software through the full lifecycle for safety related real-time systems application software for the next generation of Missile Systems. This is a technical hands-on role working the full software lifecycle. Responsibilities: Responsible for delivering the on-board software for the next generation of Missile Systems. This is a hands-on role and will involve architecting, designing, implementing and testing missile subsystem software to required standards and processes. Minimal: (Good) Authoring Specifications through the full lifecycle: planning, design and test documents. Experience of working with formal requirements capture tool. Requirements Analysis Experience Knowledge of Source Configuration Control Processes (e.g., PVCS, RTC, GIT) Very Good attention to detail. Working with minimal supervision Ability to debug complex problems and be able to produce required documentation to achieve the required safety level. Significant previous experience of developing bare-metal embedded software using C/C++. Working in a team and with members from other disciplines e.g. Systems, Integration, Electronics Required: (Better) Previous experience of development and verification of embedded software developed to high safety integrity level such as DO178C Level B or SIL-4 or equivalent standards. Specification & requirements creation and compliance recording in DOORS. Working knowledge of C/C++ for testing special builds and focussed code reviews. Unit Testing using LDRA, RAPITA or equivalent testing tool. Understanding of Code Coverage and techniques/strategies used to cover/justify shortfall Working in a lab environment with live equipment (PSUs, Scopes, Logic Analysers etc.) conducting system tests. Desirable: (Best) Significant experienced in developing software to DO178C Level B. Knowledge of Defence standards and Micro-controller technologies Testing on Development Cards with a test environment or bare-metal with special builds Experience using RAPITA Systems Tool Suite Experience of Modelling and Ansys SCADE Tool Suite Knowledge and use of ALM such as JIRA or IBM Engineering Workflow Manager Creation and use of Virtual Machines (VMWare) TPBN1\_UKTJ

FPGA / Digital Electronics Hardware Engineer
Certain Advantage
Luton
Hybrid
Junior - Mid
£640/day

World Class Defence Organisation is currently looking to recruit a FPGA / Digital Electronics Hardware Engineer subcontractor on an initial 12 month contract. The department are looking to recruit a number of contractors who have skills in FPGA, VHDL, Xilinx or Digital design. Rate: £80 per hour (Umbrella) Location: Your base site can be any of the following (depending on your preference) Edinburgh, Southampton, Luton, Newcastle, Basildon, Bristol, or Yeovil. FPGA / Digital Electronics Hardware Engineer Job Description: The Digital hardware engineer would be responsible for design, commissioning and test of high-speeddigital electronicshardware, i.e. Printed Circuit Assemblies (PCAs) on complex systemsfor airborne Radar products. The role will be based at our customers site in Edinburgh or Luton and may allow for hybrid working after an initial period of familiarisation onsite. Creating high-quality and robustdigital electronicsdesigns Documenting and recording deliverables Supporting integration &verificationactivities at hardware and system level Keeping designs under configuration control Providing progress reports Skills, Qualifications and Experience required: Essential Degree or equivalent inElectronicsEngineering or other STEM-based subject A minimum of 1 to 3 years experience of designing high-speeddigital electronicsusing the latest FPGA and / or microprocessor devices and high-speed interconnect technology Experience inschematic captureusing Mentor Graphics (Siemens EDA)DxDesigneror similar tools Experience of high-speed serial communication interfaces/ protocols (e.g. PCIe,Ethernet/ IEEE802.3, SPI, I2C, etc.) and high-speed bus architectures (e.g.DDR3/4) Use of high-speed digital design techniques such as signal termination,controlled impedance, matched lengthtracking, ground/ power planes, decoupling, etc. Functional simulation & timing analysis / constraints at circuit level Experience of PCB layout, working closely with and providingguidanceto PCB layout engineers on high-speed digital designs Hands on experience of integrating hardware, firmware & software on FPGA and microprocessor-based PCAs Ability to coordinate day-to-daytechnicalactivities,liaisingclosely with the lead engineer / digital hardware lead & other engineering disciplines Experience ofliaisingwith Manufacturing / Production colleagues and external suppliers of key components and assemblies Good communication (oral & written) & interpersonal skills Experience ofdebugging& testing new hardware designs Previous experience of the fullhardware designlifecycle and presenting designs for peer and formal design reviews Self-motivated, with an aptitude for problem solving and driving difficult issues to conclusion Experience in writingtechnicalreports / documentation Desirable Relevant experience in the Aerospace/Defence industry or on other complex / high-reliability systems Ability to analysesystem requirementsand derive detailed hardware requirements Experience ofsignal integrity&power integrityanalysis (SI/PI) at board level Knowledge of FPGA / Software coding languages (VHDL, C,Assembler) Qualifications Honours or Masters degree inElectronicsEngineering or related STEM subject UK citizenship is mandatory to be able to clear the background checks and obtain SC clearance Current valid SC clearance would be an advantage Education Type Degree (BSc/ BEng/ MSc/ MEng) inElectronicsEngineering or equivalent TPBN1\_UKTJ

C# / C++ Software Engineer
Certain Advantage
Stevenage
Hybrid
Mid
£520/day
+1

World Class Defence Organisation is currently looking to recruit a C# / C++ Software Engineer subcontractor on an initial 12 month contract.  The department are happy to consider candidates with a mixture of C# and C++ or someone with just C# experience. Job Title: C# / C++ Software Engineer Rate: £65.00 per hour Location: Stevenage Hybrid / Remote working: The role will be a hybrid role of 3 or 4 days per week onsite 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) 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 and synthetic environments to provide visualisations, demonstrations, verification & validation as well as training capability and support. The role support the development of the worlds most advanced defence systems from the initial concept all the way through to in service support and training, using a range of simulation technologies, including digital twins and emulators. Working with Project Leads and Simulation Architects to design and develop simulation components as an end to end representation of a weapon System in a synthetic environment using C#, C++ and integration simulations, supporting a number of industry standards. You will work as part of a heterogeneous agile development team, made up of mixed discipline engineers working in synergy to develop simulations and representations of real equipment. Our approach to software development includes Configuration control Continuous Integration Continuous Delivery or Deployment. Unit testing and test driven development. Skillset / experience required: Proficient in C# / C++ Microsoft Visual Studio, Eclipse, Ability to work from high level/system view into technical detail. Excellent verbal, presentation and written communication skills Knowledge of using Microsoft Windows and Linux operating systems Non-essential: Distributed simulation standards / Protocols (DIS, HLA, DDS) and web services development (JavaScript, Node JS or similar) Military Communications, Datalinks and Interfaces such as 1553/1760 and Ethernet TCP/IP Practical knowledge of System integration principles and processes

Infotainment Test Engineer
Expleo UK LTD
Warwickshire
In office
Mid - Senior
Private salary
TECH-AGNOSTIC ROLE

Expleo is proud to be supporting a leading automotive manufacturer in delivering excellence across their vehicle lines. We're currently looking for an Infotainment Test Engineer to be responsible for the hands-on testing of automotive infotainment systems. This contract role will be supporting our client based in Warwickshire. The Infotainment Test Engineer will be responsible for: Leading the delivery of test programmes, ensuring results are achieved through thorough validation and effective problem-solving. Planning and executing comprehensive testing of infotainment systems, with a focus on active NVH technologies. Ensuring all testing activities comply with automotive quality standards and technical specifications. Identifying performance issues across systems and subsystems and proactively drive enhancements. Developing and implement test specifications for both new and existing infotainment components. Setting up, managing, and maintaining of test rigs and environments for infotainment and audio system evaluation. Essential background and skills of the Infotainment Test Engineer: Extensive experience in testing automotive infotainment systems, with a strong preference for exposure to active NVH technologies. Highly execution-driven, capable of independently managing and delivering complex test programmes from planning through validation Skilled in debugging and analytical techniques, with a keen eye for identifying and resolving system-level issues Hands-on expertise with audio systems, including rig setup and configuration for validation and performance testing Bachelor's degree (or higher) in Electrical Engineering, Electronics, Automotive Engineering, Computer Science, or a closely related technical field PLEASE NOTE To meet with current legislation, right to work checks will be carried out to ensure candidates can work in the UK. Regretfully, we are unable to support applications that require sponsorship. Any application will be treated in a highly confidentiality manner and all conversations will be respected. For more information on the Infotainment Test Engineer role, please apply now:

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Frequently asked questions
Haystack features a wide range of contract firmware engineer positions, including roles focused on embedded systems, IoT device development, real-time operating systems, and hardware-software integration across various industries.
To apply, simply create an account on Haystack, upload your resume, and browse the available contract firmware engineer listings. When you find a job that matches your skills, click 'Apply' and follow the instructions provided by the employer.
Yes, Haystack allows you to filter contract firmware engineer jobs by contract duration, location (including remote opportunities), and other criteria such as industry sector and required experience level.
Many contract firmware engineer roles on Haystack offer remote or flexible work options, but this varies by employer and project requirements. Each job listing clearly indicates if remote work is available.
Typical qualifications include a background in electrical engineering or computer science, proficiency in programming languages like C/C++ and assembly, experience with embedded systems, and knowledge of firmware development tools and debugging techniques. Specific requirements may vary depending on the position.