Systems/Software Engineer

Expleo is a leading Global Engineering Services Provider with UK presence in 10 locations. We are seeking a Systems/Software Engineer to provide support Defence Electronics projects.  This activity is based at our client’s Stevenage facility.

We are looking for an energetic and driven engineer with broad expertise, however of particular interest would be candidates with (in order of priority) defence, aerospace, military, marine or rail experience.

This role represents a great opportunity to work on cutting-edge defence technology products, contributing to the security of the UK and our allies.  Valued attributes are a team player who can use their initiative and has a real passion for engineering with an attention to detail, combined with a thorough, methodical approach to problem solving.

• Support the CSE as a focal point for GCN, Software, Simulation & Modelling stakeholders.
• Analyse requirements driving system algorithm and software design, including trade-off analysis and product evolution
• Define and align Common Algorithm/Software Architecture with stakeholders, ensuring adherence to BMS Standards and Def Stans
• Perform functional verification of algorithm components in model environments, including hardware-in-the-loop testing
• Validate algorithm behaviour in target software environments to ensure consistency with model environments
• Validate integrated algorithm and non-algorithm components in target software for full functional chain testing
• Manage testing within software labs, compatibility labs, and HWIL environments with appropriate hardware/software standards
• Lead system performance activities including model development, requirement specification, and V&V documentation
• Deliver design studies, performance trades, and safety-related analyses as system properties evolve
• Coordinate specialist domains (GCN, Seeker, IP, Aero, FAS) contributing to system performance
• Deliver pre-flight modelling and post-trial analysis, including telemetry data processing and reporting

• Degree level qualification in a relevant discipline.
• A lower qualification would be acceptable for example HND/HNC should the candidate be able to demonstrate significant demonstrable experience in lieu

• Matlab — proficient in modelling, analysis and algorithm development
• Coding — capable of developing and reviewing software to support modelling and integration
• Modelling — skilled in creating and interpreting system and subsystem models
• Simulation — able to run and analyse simulations to assess system behaviour
• Hardware‑in‑the‑loop — experienced in using HWIL setups to validate real‑time behaviour
• System integration — adept at integrating software, algorithms and hardware
• V&V lifecycle — knowledgeable across planning, execution and evidence generation
• BMS standards — familiar with BMS standards and their application
• Def Stans — understands relevant Defence Standards and their impact on development
• Stakeholder engagement — effective at working with cross‑functional technical teams
• Team leadership — able to guide technical activities and coordinate multidisciplinary work

• Performance modelling — able to assess system behaviour through structured modelling approaches
• Monte Carlo simulation — capable of running probabilistic simulations to explore system variability
• Statistical analysis — skilled in analysing data sets to extract trends, behaviours and performance indicators
• Telemetry processing — able to interpret and process telemetry data for trials and post‑test analysis
• Trials experience — familiar with supporting live or simulated trials and handling associated data
• Safety studies — able to contribute to safety‑related assessments and system behaviour evaluations
• Trade studies — capable of comparing design options to support informed technical decisions

• Real‑time software — contributed to systems requiring deterministic, time‑critical behaviour
• System integration — brought hardware, software, and algorithms together into a functioning system
• Modelling — used system or subsystem models to support design and performance assessment
• Algorithm verification — confirmed algorithm behaviour through simulation and hardware‑in‑the‑loop methods
• Laboratory testing — carried out structured testing in software, compatibility, and HWIL labs
• Performance trades — evaluated design options and system behaviours to support trade‑off decisions
• Trial support — supported pre‑flight modelling, telemetry preparation, and post‑trial data analysis
• V&V documentation — produced verification plans, validation evidence, and structured reports
• Stakeholder coordination — worked with cross‑functional teams to align inputs and system behaviour

• UK sole National
• SC or ability to be SC cleared.
• Ability and willingness to work minimum 4 days per week at the client site in Stevenage.

• Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges  
• We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects   
• Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses  
• Competitive company benefits
• Always working as one team, our people are not afraid to think big and challenge the status quo 

• As a Disability Confident Committed Employer we have committed to:
  • Ensure our recruitment process is inclusive and accessible
  • Communicating and promoting vacancies
  • Offering an interview to disabled people who meet the minimum criteria for the job
  • Anticipating and providing reasonable adjustments as required
  • Supporting any existing employee who acquires a disability or long term health condition, enabling them to stay in work at least one activity that will make a difference for disabled people

“We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”. 

We treat everyone fairly and equitably across the organisation, including providing any additional support and adjustments needed for everyone to thrive