Principal Software Engineer

Date Posted: 2026-08-06 Country: United Kingdom Location: Gloucester, South Gloucestershire Position Role Type: Onsite Raytheon UK have a full time, perm opportunity for a Principal Software Engineer to join our specialist teams working onsite at our Manchester and Gloucester sites. You'll be part of our experienced software dev function, working in a cross-functional team, delivering and deploying critical software across a variety of programmes. In this area of the business we prove DevSecOps at scale, Artificial Intelligence, Machine Learning, cyber and geospatial intelligence capabilities to support the defence, intelligence and cyber sectors. Collaborating with customers and suppliers to deliver secure, mission critical systems using the latest technologies and innovations. We have opportunities for Software Engineers at every level within a team across our Manchester, Gloucester or London teams, so we will discuss the great opportunities for development or challenges we offer based off your professional profile. Due to the interesting work we do and the sector this team is working in, we require all candidates to be eligible and willing to obtain SC and eDV clearance. Responsibilities: Design and build software using industry best practiceCollaborate with stakeholders and other engineersContribute to the completion of milestones associated with your projectContribute to continuous improvement within your teamCollaborate with your peers on technical direction within your team Desired Skills and Experience: Core Software Engineering across a variety of languages, e.g. JavaScript frameworks (React, NextJS), TypeScript, Python, JavaREST API developmentOpenAPI / SwaggerCloud services (AWS or Azure)Containerisation & Orchestration (Docker, Kubernetes, OpenShift)Infrastructure as Code (Terraform, Ansible)Relational Databases (e.g. PostgreSQL)Elasticsearch / OpensearchUnit testing and automationTesting frameworks (e.g. Mocha, Jest, Cypress)Experience working in an Agile delivery teamUse of code repositories (e.g. GitLab); familiarity with branching strategies, pull requests and merge processes We appreciate you may not be an expert in every area above - we can support with training and development in some areas! Please do make an application and we will identify where we can best support your growth specific to your application. Benefits & Work Culture Benefits: Contributory Pension Scheme (up to 10.5% company contribution)6 times salary ‘Life Assurance’ with pension25 days holiday (increasing with service) + statutory public holidays, plus opportunity to buy and sell up to 5 daysCompany bonus scheme (discretionary)Flexible Benefits scheme with extensive salary sacrifice schemes, including Health Cashplan, Dental, and Cycle to Work amongst othersEnhanced sick payEnhanced family friendly policies including enhanced maternity, paternity & shared parental leave Work Culture: 37hr working weekEarly 1.30pm finish Friday, start your weekend early!Up to 5 paid days volunteering each year. Flexible working culture focused on output, with more formal flexible working arrangements on request (assessed subject to role) - please highlight any requests to the Talent Acquisition team. About Us At Raytheon UK, we take immense pride in being a leader in defence and aerospace technology. As an employer, we are dedicated to fuelling innovation, nurturing talent, and fostering a culture of excellence. Joining our team means being part of an organisation that shapes the future of national security whilst investing in your growth and personal development. We provide a collaborative environment, abundant opportunities for professional development, and a profound sense of purpose in what we do. Together, we are not just advancing technology; we're building a community committed to safeguarding a safer and more connected world. RTX Raytheon UK is a landed company and part of the wider RTX organisation. Headquartered in Arlington, Virginia, USA, but with over 180,000 employees globally across every continent, RTX provides advanced systems and services for commercial, military and government customers worldwide and comprises three industry-leading businesses – Collins Aerospace Systems, Pratt & Whitney, and Raytheon. Supporting over 35,000 jobs across 13 UK sites, RTX is helping to drive prosperity. Each year our work contributes over £2.7bn to the UK economy and offers a wealth of opportunities to 4,000 suppliers across England, Scotland, Wales and Northern Ireland. We’re investing in all corners of the country, supporting 29,040 jobs in England, 3,040 in Northern Ireland, 1,900 in Scotland and 1,600 in Wales. RTX adheres to the principles of equal employment. 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