Principal Software Engineer

Location: Gloucester, South Gloucestershire, Manchester, Lancashire

Time Type: Full time

Job Description

Date Posted:

2026-08-11

Country:

United Kingdom

Location:

Gloucester, South Gloucestershire

Position Role Type:

Onsite

Principal Software Engineer

Gloucester / Manchester

Onsite

Due to the interesting work we do and the sector this team is working in, we require all candidates to currently hold eDV clearance. 

Design and build software using industry best practice
Collaborate with stakeholders and other engineers
Contribute to the completion of milestones associated with your project
Contribute to continuous improvement within your team
Collaborate 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, Java
REST API development
OpenAPI / Swagger
Cloud services (AWS or Azure)
Containerisation & Orchestration (Docker, Kubernetes, OpenShift)
Infrastructure as Code (Terraform, Ansible)
Relational Databases (e.g. PostgreSQL)
Elasticsearch / Opensearch
Unit testing and automation
Testing frameworks (e.g. Mocha, Jest, Cypress)
Experience working in an Agile delivery team
Use of code repositories (e.g. GitLab); familiarity with branching strategies, pull requests and merge processes

Benefits 

Contributory Pension Scheme (up to 10.5% company contribution) 
6 times salary ‘Life Assurance’ with pension 
25 days holiday (increasing with service) + statutory public holidays, plus opportunity to buy and sell up to 5 days (37hr) 
Company bonus scheme (discretionary) 
Flexible Benefits scheme with extensive salary sacrifice schemes, including Health Cashplan, Dental, and Cycle to Work amongst others 
Enhanced sick pay 
Enhanced family friendly policies including enhanced maternity, paternity & shared parental leave 

Work Culture 

37hr working week, although hours may vary depending on role, job requirement or site-specific arrangements. 
Early 1.30pm finish Friday, start your weekend early! 
Remote, hybrid and site based working opportunities, dependant on your needs and the requirements of the role.
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. 

This position is classified as:

Onsite: Employees who are working in Onsite roles will work primarily onsite.

RTX adheres to the principles of equal employment. All qualified applications will be given careful consideration without regard to ethnicity, color, religion, gender, sexual orientation or identity, national origin, age, disability, protected veteran status or any other characteristic protected by law

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RTX adheres to the principles of equal employment. All qualified applications will be given careful consideration without regard to ethnicity, color, religion, gender, sexual orientation or identity, national origin, age, disability, protected veteran status or any other characteristic protected by law.

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