RTX
Principal Software Engineer
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Principal Software Engineer – Manchester/Glover, Raytheon UK
Location: Manchester, Lancashire or Gloucester (Hybrid Working Pattern) Role Type: Full-time, Permanent, Onsite Publication Date: 2026-06-24
About the Role
Raytheon UK is seeking a Principal Software Engineer to join their technical team, supporting critical software development for defence, intelligence, and cyber sectors. This opportunity focuses on technical leadership, with an optional hybrid of people management responsibilities. You’ll collaborate within a cross-functional team to design, develop, and deploy sophisticated software solutions.
This role requires SC security clearance (current or eligible) and willingness to obtain eDV (Enhanced Dangerous Vehicles) clearance if applicable for assigned projects.
Key Responsibilities
As a Principal Software Engineer, you’ll:
- Design and build secure, high-quality software following industry best practices.
- Collaborate with stakeholders, cross-functional teams, and engineers to shape technical direction.
- Guide development teams (or peers), mentor junior colleagues, and ensure continuous improvement.
- Work on milestone-driven projects, delivering and scaling critical systems across defence, AI/ML, geospatial, and cyber domains.
Required Skills & Experience
We seek candidates with expert-level skills in:
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- Full-stack development (preferably in the following ecosystem):
- JavaScript frameworks: React, NextJS
- TypeScript
- Python/Java
- REST API development with OpenAPI/Swagger.
- Cloud platforms: Deep experience with AWS or Azure.
- Containerisation & Orchestration: Docker, Kubernetes, OpenShift.
- Infrastructure as Code (IaC): Terraform, Ansible.
- Database management: Relational databases (e.g., PostgreSQL), Elasticsearch/Opensearch.
- Unit testing & automation: Testing frameworks: Jest, Cypress, Mocha. CI/CD pipeline optimization.
Note: We understand not every skill will align perfectly—training and development are provided for relevant areas.
Benefits & Work Culture
Benefits:
- Pension Scheme: Contributory plan with up to 10.5% company contribution.
- Salary Protection: 6x annual compensation for life assurance benefits.
- Holidays: 25 days + statutory public holidays (+ voluntary buy/sell agreement for 5 extra days).
- Cash Benefits & Salary Sacrifice: Private medical insurance. Health Cashplan, dental plans, cycle-to-work.
- Enhanced Family Policies: Increased maternity/paternity/shared parental leave.
- Sick Pay: Enhanced rate (terms available in benefits booklet).
- Discretionary Bonus Scheme: Performance-linked pay adjustments.
- CSR Programme: 5 paid volunteering days annually.
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Work Culture:
- Hybrid model with output-based flexibility: 37-hour workweek.
- Efficient start/finish: Early 1:30pm Friday officiating weekend kick-off.
- On-request flexible working arrangements (subject to role-specific assessment).
About Raytheon UK
As part of RTX (industry leaders in aerospace and defence technologies), Raytheon UK specialises in DevSecOps, AI/ML, geospatial intelligence, and cybersecurity solutions.
Why join us?
- A collaborative team, supporting critical national security initiatives.
- Commitment to employee growth, with training and leadership development.
- Purpose-driven work with innovative impacts worldwide.
- 180,000 global employees across defence, commercial, and government markets.
RTX Activities in the UK:
- Supports 36,000 roles across 13 UK locations.
- £2.7B+ annual economic impact in defence and aerospace.
- Extensive supplier network enabling opportunities (4,000+ vendors).
Diversity Statement: "RTX adheres to equal employment principles and prohibits discrimination based on protected characteristics, including but not limited to race, gender identity, disability, veteran status:" policies are fully enforced.
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