Principal Software Developer in Warminster

Warminster based, hybrid working. Be at the forefront of transforming British Army training.

About us

At OMNIA® Training, we bring together some of the UK’s most innovative defence training organisations to transform the British Army’s training system.

The role

This is more than a job — it’s a mission. You will be part of a high‑impact, collaborative environment, where everyone lives the values and standards of the British Army. Every person plays a critical role in delivering OMNIA’s vision; designing, delivering, and transforming collective training so the British Army is ready to fight and win.

Key Responsibilities

• Build secure and performant backend services using Node.js, Python, Java, or .NET Core/.NET 5+.
• Integrate APIs, databases, and third‑party services, ensuring seamless data flow and system interoperability.
• Develop and maintain robust frontend interfaces using modern frameworks such as React or Angular.
• Design, build, and maintain scalable software solutions with a cloud‑first mindset, leveraging cloud‑native services and infrastructure.
• Use Docker and Kubernetes to containerise applications for consistent development, testing, and deployment across environments, including Red Hat OpenShift.
• Automate build, test, and deployment processes using Jenkins, GitHub Actions, Tekton, or Azure DevOps.
• Implement Infrastructure as Code (IaC) using Terraform or CloudFormation.
• Support estimation and planning activities in an agile environment.
• Conduct peer code reviews, ensuring adherence to coding standards, performance optimisation, and maintainability, including static analysis tools such as SonarQube.
• Contribute to continuous improvement, identifying opportunities to refine code quality, development workflows, and team collaboration.
• Establish and maintain automated test suites for unit, integration, and end‑to‑end testing.
• Build solutions with observability and monitoring in mind, integrating logging, metrics, and tracing to maintain system health and performance.
• Stay current with emerging technologies, frameworks, and industry trends.
• Monitor and respond to vulnerabilities, ensuring compliance with security standards such as OWASP or NIST.

Who we are looking for

You’ll have a mission focus and the enthusiasm to get things done. You’ll work collaboratively with other defence training organisations and the British Army, learning lessons and sharing them across the team. You’ll understand what it means to put the mission first.

Essential Skills and Experience

• 5+ years in full‑stack development using frameworks like React or Angular and backend technologies such as Python, Java, JavaScript, Go, or .NET Core.
• Experience with containerisation using Docker and orchestration with Kubernetes.
• Cloud platform expertise with AWS, Azure, or MODCloud (OCP) for deploying and managing cloud‑native applications.
• Experience with CI/CD tools such as Jenkins, GitLab CI, GitHub Actions, Tekton, or Azure DevOps.
• Infrastructure as Code using Terraform or CloudFormation.
• Experience with static and dynamic code analysis tools like SonarQube, Snyk, or OWASP ZAP.
• Experience developing RESTful APIs.
• Self‑starter who can prioritise and plan complex work in a rapidly changing environment.
• Excellent communication skills with ability to interact with stakeholders at all levels.
• Holder of current SC clearance, or the ability to gain one.

Desirable Skills and Experience

• BSc/BEng in Software Engineering or equivalent professional accreditation.
• Experience with automated testing tools such as JUnit, NUnit, Selenium, Cypress, Postman, or PyTest.
• Background in performance tuning for high‑throughput, low‑latency data systems.
• Knowledge of data warehousing and Lakehouse technologies.
• Experience with secrets management and identity access controls such as HashiCorp Vault, AWS IAM, or Keycloak.
• Experience with monitoring and logging for security and performance (ELK, Prometheus, Grafana).
• Experience with API management and gateway tools and services.
• Hands‑on experience deploying to Red Hat OpenShift.

What we offer

• Part of a ground‑breaking mission within the UK’s most advanced defence training alliance, pushing boundaries and delivering excellence.
• A culture built on collaboration, inclusive and high‑performing team dynamics.
• Opportunities to shape future‑facing programmes with real‑world impact on national defence.
• Career growth and benefits, including a strong development package and clear pathways.

OMNIA® Training and its partners are proud to be an equal‑opportunity employer. We welcome applicants of all backgrounds and identities; what matters is your passion, expertise, and dedication to the mission. RTX adheres to the principles of equal employment. All qualified applications will be considered without regard to ethnicity, color, religion, gender, sexual orientation, identity, national origin, age, disability, protected veteran status, or any other characteristic protected by law.