Software Engineering Intern (Sept 2026)

About this opportunity and L3Harris UK

From 11 UK sites our team of nearly 1000 people delivers unique capabilities across space air land sea and cyber for military security and commercial customers across the UK and worldwide.

The Engineering Team are responsible for the through-life support of in-service tactical radio products and the development of products and systems to meet next generation customer requirements. The small multi-disciplinary engineering team comprises system software hardware and mechanical engineers and were currently seeking an Undergraduate Software Engineer to join our team for 12 months in 2026.

This is an opportunity to be an integral part of a team involved in the design development and verification of software updates to in-service radio equipment and next generation products.

The successful individual will be supported to take what they already know and grow with on-the-job training supported by a dedicated Line Manager and Mentor

A few of our employee benefits are:

• 25 days holiday per year (plus bank holidays) increasing with long service and with the opportunity to buy/sell up to 5 days

• Private medical insurance with optional family cover

• Pension scheme of up to 7% employer contribution

• Life Assurance 4x salary (flexible up to 10x)

• Group income protection

• Flexible opt-in extras such as a health care cash plan dental insurance gym membership critical illness cover and cycle to work scheme

• Employee assistance program providing mental health and wellbeing support

What you can expect:

• Work with the project technical lead to plan out your work.
• Code from existing designs and progress to design and implementation.
• Learn about our product architectures to build your understanding of software development techniques in a real-time environment.
• Prepare and maintain accurate technical documentation including design descriptions and test reports.
• Work collaboratively with systems software and other disciplines to ensure successful delivery of secure reliable and resilient communications systems.

What youll bring

The role requires the following experience and skills:

Desirable:

• Experience of object oriented design and implementation principles
• Linux application and/or driver development experience
• Knowledge of computer networks and automated test environments.

Important to know

Due to the nature of our work many our roles require a UK nationality and the ability to obtain a security clearance. Applicants who accept a conditional offer of employment must meet the requirement of right to work in the UK and must meet eligibility requirements for access to classified information and will be subject to government security checks.