Principal Software Engineer (AI/ML)

Leonardo UK Ltd; Luton; Hybrid; GBP 54,000 - 70,000; Full time

Benefits offered by this job

Generous leave and flexi days

Award-winning pension scheme (up to 15

Mental health support and employee-led

Coursera/LinkedIn Learning access

Bonus scheme for management levels

Private healthcare and family cover

Job summary

Leonardo UK Ltd is seeking Senior or Principal Software Engineers with a focus on AI/ML to join our Electronics UK business in the UK. You will contribute to delivering AI-enabled software for challenging defense and civilian projects.

The role requires experience with AI/ML, Python, and Agile development, and offers hybrid working arrangements with security clearances as applicable.

Qualifications

• Experience with AI/ML in high-integrity, regulated environments.
• Degree in CS/Engineering with practical software delivery experience.
• Industry experience on Agile projects across full software life cycle.
• Proficiency in PyTorch and TensorFlow and model integration tools.
• Strong foundations in AI/ML including LLMs, embeddings, and tokenisation.

Responsibilities

• Support systems engineers on research projects while delivering deployable software leveraging AI/ML.
• Develop scalable software solutions and AI/ML workflows for civilian and military projects.
• Contribute to the delivery of cutting-edge defence and aerospace software systems.

Skills

AI/ML knowledge

Prompt engineering

LLM technologies

Agile software development

Data processing & embeddings

API design & integration

Security & compliant AI

Transformer architectures

High-performance computing

Python & software engineering

Education

Degree in Computer Science or Engineering

Tools

PyTorch

TensorFlow

Model integration tools

Job description

Salary Range: £54,000 - £70,000. Leonardo UK operates a grade-based salary framework with broad bands. The salary range shown reflects the approved grade band for this role, or a narrower hiring range published within that band, and is benchmarked against the external market. Exceptions above the standard range are managed through governance controls to protect internal equity.

Are you a software engineer with a working knowledge of Artificial Intelligence (AI) and Machine Learning (ML)? If you are interested in developing software for cutting‑edge defence and aerospace projects such as a sixth‑generation stealth fighter jet or a revolutionary Laser Directed Energy product, Leonardo would like to hear from you. We are seeking Senior or Principal Software Engineers with an interest in AI/ML to join our Electronics UK business. Successful candidates will contribute to the delivery of leading‑edge solutions for challenging civilian and military projects.

Responsibilities

Support our systems engineers on research projects while developing deployable software solutions that leverage AI/ML capabilities.

Qualifications

• Experience of, and a passion for, AI/ML.
• A degree in Computer Science, Engineering, or a related technical discipline, combined with practical experience delivering high‑integrity software products within a regulated environment.
• Industry experience working on Agile projects across the full software life cycle.
• Proficiency in machine learning frameworks such as PyTorch and TensorFlow, as well as tools for model integration.
• Strong foundation in AI/ML, including transformer architectures, tokenisation, embeddings, and fine‑tuning large language models (LLMs).
• Experience building scalable pipelines, including APIs, vector databases, retrieval‑augmented generation (RAG), and orchestration frameworks.
• Experience curating datasets, managing embeddings, and ensuring security, privacy, and responsible AI practices.
• Experience in prompt engineering, with the ability to design, test, and systematically improve prompts, while measuring the accuracy, bias, and robustness of LLM outputs.
• Awareness of agentic workflows involving AI agents that can plan, reason, and take autonomous actions.
• Awareness of governance, security, and compliance considerations relating to data management and AI deployment.
• Awareness of mathematical libraries used for signal, image, and data processing.
• Awareness of high‑performance computing and the challenges associated with parallel processing.
• Willingness to learn and develop, even if not all requirements are met.

Security Clearance

This role is subject to pre‑employment screening in line with the UK Government’s Baseline Personnel Security Standard (BPSS). Additional Personnel Security Controls may apply, including National Security Vetting (NSV) such as The Security Check (SC) or Developed Vetting (DV). For more information and guidance please visit: https://careers.uk.leonardo.com/gb/en/security-and-vetting

Benefits

• Enjoy generous leave with the opportunity to accrue up to 12 additional flexi‑days each year.
• Benefit from our award‑winning pension scheme with up to 15% employer contribution.
• Free access to mental health support, financial advice, and employee‑led networks championing inclusion and diversity (Enable, Pride, Equalise, Armed Forces, Carers, Wellbeing and Ethnicity).
• All employees at management level and below are eligible for our bonus scheme.
• Free access to 4,000+ online courses via Coursera and LinkedIn Learning.
• Receive a financial reward through our referral programme.
• Spend up to £500 annually on flexible benefits including private healthcare, dental, family cover, tech & lifestyle discounts, gym memberships and more.
• Flexible hours with hybrid working options. For part‑time opportunities, please talk to us about what might be possible for this role.

Location

Primary: GB - Luton - Cap. Green 300Additional: GB - Basildon, GB - Edinburgh, GB - Lincoln, GB - Newcastle, GB - Southampton

Contract

Permanent. Hybrid Working: Hybrid International, multicultural, innovative, technological.