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Back-End Software Engineer
Vacancy Reference: 2025/CLA-441
Position: Full-time
Location: Salisbury or Bristol
Salary Range: £50k - £60k per annum depending on relevant experience
At Callen-Lenz, we are expanding the limits of what is possible. We specialise in crewed and uncrewed aircraft operations and technology, and having recently received investment into the business we are going through a period of rapid growth and development and are looking for key roles to assist with these changes. Callen-Lenz offers innovative and customer focused UAS solutions through our 4 key business strands; technical services, products, platforms and operational services.
We are looking for individuals to help drive forward our expansion, placing you at forefront of UAS development in the UK.

Our Values

• Teamwork
• Commitment
• Initiative
• Creativity
• Agility
• Integrity
• Enjoyment

Why Work for Us
Based in the heart of rural Wiltshire, close to the Historic city of Salisbury you will join our rapidly growing, friendly and multi-disciplined team, working on a range of diverse and interesting projects, leading the way in this exciting field and witnessing the full lifecycle of our products. The Callen-Lenz team are passionate about what we do, and we are searching for individuals to grow with us as we expand into the aerospace industry.

Our benefits include:

• 25 days annual leave per year (plus bank holidays)
• Buy/Sell holiday policy up to 5 days either way
• Pension Scheme via Royal London
• Company contributed Share Incentive Plan.
• Green Car Scheme
• Life assurance scheme (6x basic salary)
• Income protection policy (75% of basic salary)
• Private Health Insurance via Vitality
• Private Dental insurance via Bupa
• Enhanced Maternity and paternity
• 1 Professional membership reimbursed per year
• 1 paid volunteering day per year
• Access to an independent financial advisor year round
• Training & development opportunities

About the Role
We are looking for a Back-End Software Engineer to join our applications team. The role covers all aspects of Software Engineering including design, implementation and testing. This exciting role will place the right candidate at the forefront of unmanned air systems development in the UK.
As part of the applications team, you will be contributing to our next-generation mission systems. The successful candidate will have a desire to work in a small, fast-moving team building an ambitious greenfield project with significant ownership and input into future direction and design.

Responsibilities

• Technical design of Back-End software applications
• Creating robust, testable and scalable software
• Deliver software releases iteratively to milestones and/or deadlines
• Help estimate and refine software development tasks
• Ensure code quality is maintained by implementing sufficient testing and contributing to code reviews

About You / Skills and competencies:

Essential:

• Proficiency in: Go, TypeScript and/or JavaScript
• Demonstrable experience in some of the following other technologies: MySQL, MongoDB, Postgres, redis, gRPC, WebSockets, REST API, React, CSS, rego/OPA, Jest, Cypress, Redux, microservices, AWS/Azure/GCP, Docker, Kubernetes, etcd, Tailwind, DaisyUI, shadcn/ui, Git, Ansible, Terraform, HTML5, Leaflet/Mapbox/Cesium
• Design and architecture of complex applications
• Experience using version control tools such as GitLab or GitHub
• Working to a development methodology eg Scrum, Agile
• Reviewing the code of other engineers using merge requests

Desirable:

• Knowledge of safety related engineering practices
• Working to coding standards
• Experience in DevOps and testing

Please click here to read our privacy notice
Callen-Lenz is an equal opportunities employer, committed to building an inclusive working environment. We welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation, or age. It is essential that the successful candidate must, by the start of their employment have permission to work in the UK. Proof of identity and eligibility to work in the UK will be required prior to commencement of employment.
Please be aware that many roles at BAE Systems are subject to both security and export control restrictions. These restrictions mean that factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict the roles you are eligible to perform within the organisation. All applicants must as a minimum achieve Baseline Personnel Security Standard. Many roles also require higher levels of National Security Vetting where applicants must typically have 5 to 10 years of continuous residency in the UK depending on the vetting level required for the role, to allow for meaningful security vetting checks

• Technical design of Back-End software applications
• Creating robust, testable and scalable software
• Deliver software releases iteratively to milestones and/or deadlines
• Help estimate and refine software development tasks
• Ensure code quality is maintained by implementing sufficient testing and contributing to code review