Web Developer jobs in United Kingdom

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work‑life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris Technologies is the Trusted Disruptor in the defense industry. With customers’ mission‑critical needs always in mind, our employees deliver end‑to‑end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.

Job Title – Full Stack Software Engineer

Job Location – Tewkesbury, UK

Job ID – 31901

From 11 UK sites, our team of nearly 1,000 people delivers unique capabilities across space, air, land, sea and cyber for military, security and commercial customers across the UK and worldwide.

L3Harris in Tewkesbury is our HQ for our Intelligence & Cyber International division. In the land domain, our T7 and T4 multi‑mission robots deliver next‑generation remote capabilities and uncompromised performance. We design and manufacture world‑leading land force protection systems, cyber and electromagnetic activities (CEMA), electronic warfare (EW) and encryption capabilities. Our cyber capabilities provide an information advantage in the fields of kinetic conflict, cyber warfare, force protection and counterterrorism.

We are seeking mid‑level or experienced Software Engineers with a passion for building elegant solutions and a proven track record of technical excellence to design and develop innovative, cutting‑edge systems. This role offers the opportunity to be a hands‑on Software Engineer helping to create solutions that prioritise performance, reliability, and scalability.

Depending on your expertise, you may contribute to our Electronic Warfare, Integrated Air & Missile Defence or Information Resilience portfolios. We’re looking for full‑stack engineers with hand‑on experience in Angular and/or React, leveraging TypeScript to craft responsive front‑end web apps, and building robust RESTful APIs using the latest C# .NET technologies on the back end.

Please note that although hybrid working may be available, this is dependent on specific projects, and as such may change from time to time. As a result we cannot guarantee hybrid or remote working for this role. The successful candidate must be capable of full‑time on‑site presence at our Tewkesbury facility.

We welcome applications from individuals who bring diverse skills and experiences. If you are passionate about this role and believe you can make a meaningful contribution, we encourage you to apply, even if you don't meet every requirement.

We value a commitment to growth and are open to potential.

• £3,000 to £6,000 DV Bonus – please note this level of clearance isn’t essential for this role. This bonus is subject to individual clearance and project requirements – discussed upon application.
• Flexible or part‑time working arrangements considered upon request.
• Half day finish on a Friday
• 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 8% 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, cycle to work scheme and electric vehicle scheme
• Employee Family Assistance Program providing mental health and wellbeing support
• Professional membership reimbursement (discretionary)

The responsibilities of your role will include the following:

• Applying your software skills as an individual contributor to help develop complex software systems;
• Collaborating with cross‑functional teams to define functional and non‑functional requirements for embedded and/or user interface software projects;
• Creation of low‑level designs, implementation and test solutions, in line with the defined architecture;
• Supporting and promoting adherence to coding standards, best practices, planning documentation, procedures for software development and delivery, and continuous improvement initiatives;
• Depending on level of experience, providing guidance and mentorship to software engineers;
• Meeting cost and schedule targets while contributing to technical reviews, bids & proposals, budget & schedule discussions, customer engagement activities.

The role requires the following experience and skills:

• Angular and/or React
• Typescript
• HTML + CSS

• C# .NET (Latest)
• REST APIs
• Entity Framework Core

• Experience of using version control systems (e.g. Git / GitLab or similar);
• Strong object‑oriented design and programming skills (OOD, OOP);
• Familiarity with development methodologies (e.g. V‑model, Waterfall, Agile);
• Proficiency with tools like Jira and Confluence;
• A proven track record of delivering reliable, maintainable software across the lifecycle, including peer review;
• Strong communication, documentation and organisational skills;
• A degree (or equivalent experience) in Computer Science, Software Engineering, or a related field.

Any of the following additional experience or skills would be advantageous:

• Experience with Agile / Kanban;
• Experience with CI/CD pipelines;
• Experience with Artifactory (JFrog);
• Experience in C++, preferably embedded C++, or willing to learn;
• Experience of other languages such as C, JavaScript, Python, Rust, etc;
• Experience with Linux development environments;
• Experience architecting software systems that interface with hardware;
• Experience with DevOps tools and practices (e.g. containerisation / Docker, Kubernetes, Kafka, micro service architecture, continuous assurance / CI/CD and associated best practice);
• Demonstrated ability to document, plan and manage software team activities;
• Experience of setting up, monitoring and reporting appropriate metrics throughout the software project lifecycle.

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.

#SpecialistSoftwareEngineer

#LI-RT1

L3Harris Technologies is proud to be an Equal Opportunity Employer. We are committed to maintaining a workplace that is free from unlawful discrimination and offers equal opportunities for all. Applications from individuals are encouraged regardless of age, disability, sex, gender reassignment, sexual orientation, pregnancy and maternity, race, religion or belief, and marriage and civil partnerships.