Principal software engineer Work, Jobs in Stevenage (with Salaries)

Principal Software Engineer (AI/ML)
Leonardo UK Ltd —Luton
- £54,000 - £70,000 a year
- Full-time
- Hybrid work
- Computer Science
- Engineering
- Machine learning
- Flexible schedule
- Referral programme
Principal, Cloud Software Engineer
Jazz Pharmaceuticals —Cambridge
- Remote
- Computer Science
- Engineering
- Java
- Annual leave
8d
Principal Software Engineer
Verifile —Bedford
- £75,000 - £85,000 a year
- Hybrid work
- Azure
- Mentoring
- Software development
- Health & wellbeing programme
- Employee discount
Quick apply
13d
Principal Software Developer
MaPS —Bedford
- £90,000 a year
- Hybrid work
- Azure
- Management
- DevOps
- Annual leave
- Employee assistance programme
13d
Principal Technical Support Engineer
Leonardo UK Ltd —Luton
- £53,259 - £71,400 a year
- Full-time
- Hybrid work
- Continuous improvement
- Flexible schedule
- Referral programme
Design Quality Assurance Engineer - 12m Inside IR35 Contractor
Safran Engineering Services UK Limited —Pitstone
- Engineering
- Analysis skills
- Bachelor's degree
Quick apply
Civil/Structural Design Engineer – St Albans
Tony Gee and Partners LLP —St Albans
- Hybrid work
- Engineering
- Master's degree
- Annual leave
- Employee assistance programme
Principal Linux/Android Platform Developer
RMG Digital Ltd —Cambridge
- Up to £70,000 a year
- Full-time
- Java
- C++
- APIs
CFD Engineer
ghd —Cambridge
- Full-time
- CAD
- Engineering
- Laboratory experience
Quick apply
Senior Engineer - Radlett
Galldris —Radlett
- AutoCAD
- Civil engineering
- Engineering
- Referral programme
HR Systems Analyst (6 Month FTC)
Senior plc Head Office —Rickmansworth
- Full-time
- Hybrid work
- Microsoft Excel
- Data analysis skills
- Travel
- Work from home
- Employee assistance programme
Quick apply
3d
Tech Lead
easyJet —Luton Airport
- Full-time
- Hybrid work
- Java
- AWS
- APIs
- Employee discount
Electrical Design Engineer (Building Services)
David Bedwell Limited —Cambridge
- £35,000 - £58,000 a year
- Full-time
- AutoCAD
- Engineering
- Project management
- Flexitime
Quick apply
9d
Tech Lead – Departure & Compliance
easyJet —Luton Airport
- Full-time
- Hybrid work
- DevOps
- Java
- AWS
- Employee discount
Senior Hardware Engineer II
CesiumAstro —Cambridge
- Full-time
- Engineering
- Laboratory experience
- Bachelor's degree
9d
Principal Water Quality Scientist/ Modeller
AECOM —Cambridge
- Full-time
- Hybrid work
- Master's degree
- Project management
- Scripting
Health and Safety Consultant
AtkinsRéalis —Cambridge
- Full-time
- Hybrid work
- Microsoft Outlook
- Microsoft Office
Product Engineer
Scalian —Pitstone
- £45,000 - £55,000 a year
- Full-time
- Hybrid work
- Microsoft Powerpoint
- Microsoft Excel
- CAD
Quick apply
Senior Consultant - Transport Planning
AECOM —St Albans
- Full-time
- Hybrid work
- Engineering
- Master's degree
- Business development
Technology Director
APPLY —London
- Full-time
- Hybrid work
- Master's degree
- Business development
- Project management
Quick apply
1d

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Principal Software Engineer (AI/ML)

Leonardo UK Ltd -
Luton

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Job details

Full-time
£54,000 - £70,000 a year

Benefits

Company pension
Discounted gym membership
Private medical insurance
Flexible schedule
Referral programme

Qualifications

TensorFlow
Law
Computer Science
PyTorch
Engineering
Machine learning
APIs
Agile
AI

Full job description

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.

Your Impact

Are you a software engineer with a working knowledge of Artificial Intelligence (AI) and Machine Learning (ML)? Are you interested in developing software for some of the most cutting-edge defence and aerospace projects in the UK? If the prospect of developing software for projects such as a sixth-generation stealth fighter jet or a revolutionary Laser Directed Energy product excites you, then Leonardo would like to hear from you.

Leonardo is seeking to recruit Senior or Principal Software Engineers with an interest in Artificial Intelligence and Machine Learning to join our well-established software community within our Electronics UK business. Successful candidates will contribute to the delivery of leading-edge solutions for challenging civilian and military projects.

Leonardo has a significant interest in exploiting AI/ML technologies. In this role, you will support our systems engineers on research projects while developing deployable software solutions that leverage AI/ML capabilities.

What you’ll bring

You will have experience of, and a passion for, AI/ML. You should hold a degree in Computer Science, Engineering, or a related technical discipline, combined with practical experience in delivering high-integrity software products within a regulated environment.

We are looking for candidates with the following technical skills:

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.
A 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.

This list is not exhaustive, and we are keen to hear from you even if you do not meet every requirement. The most important attribute is a willingness to learn and develop.

Security Clearance

This role is subject to pre-employment screening in line with the UK Government’s Baseline Personnel Security Standard (BPSS). An additional range of Personnel Security Controls referred to as National Security Vetting (NSV) may apply, this could include meeting the eligibility requirements for 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

Why join us

At Leonardo, our people are at the heart of everything we do. We offer a comprehensive, company-funded benefits package that supports your wellbeing, career development, and work–life balance. Whether you're looking to grow professionally, care for your health, or plan for the future, we’re here to help you thrive.

Time to Recharge: Enjoy generous leave with the opportunity to accrue up to 12 additional flexi-days each year.
Secure your Future: Benefit from our award-winning pension scheme with up to 15% employer contribution.
Your Wellbeing Matters: 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).
Rewarding Performance: All employees at management level and below are eligible for our bonus scheme.
Never Stop Learning: Free access to 4,000+ online courses via Coursera and LinkedIn Learning.
Refer a friend: Receive a financial reward through our referral programme.
Tailored Perks: Spend up to £500 annually on flexible benefits including private healthcare, dental, family cover, tech & lifestyle discounts, gym memberships and more.
Flexible working: Flexible hours with hybrid working options. For part time opportunities, please talk to us about what might be possible for this role.

For a full list of our company benefits please visit our website.

Leonardo is a global leader in Aerospace, Defence, and Security. Headquartered in Italy, we employ over 53,000 people worldwide including 8,500 across 9 sites in the UK. Our employees are not just part of a team—they are key contributors to shaping innovation, advancing technology, and enhancing global safety.

At Leonardo we are committed to building an inclusive, accessible, and welcoming workplace. We believe that a diverse workforce sparks creativity, drives innovation, and leads to better outcomes for our people and our customers. If you have any accessibility requirements to support you during the recruitment process, just let us know.

Be part of something bigger - apply now!

Primary Location:

GB - Luton - Cap. Green 300

Additional Locations:

GB - Basildon, GB - Edinburgh, GB - Lincoln, GB - Newcastle, GB - Southampton

Contract Type:

Permanent

Hybrid Working:

Hybrid

Apply Now

Refine Your Search

principal software engineer jobs in stevenage

Principal Software Engineer (AI/ML)

Principal, Cloud Software Engineer

Principal Software Engineer

Principal Software Developer

Principal Technical Support Engineer

Design Quality Assurance Engineer - 12m Inside IR35 Contractor

Civil/Structural Design Engineer – St Albans

Principal Linux/Android Platform Developer

CFD Engineer

Senior Engineer - Radlett

HR Systems Analyst (6 Month FTC)

Tech Lead

Electrical Design Engineer (Building Services)

Tech Lead – Departure & Compliance

Senior Hardware Engineer II

Principal Water Quality Scientist/ Modeller

Health and Safety Consultant

Product Engineer

Senior Consultant - Transport Planning

Technology Director

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