Senior Software Engineer - SC Cleared

CBSbutler Holdings Limited trading as CBSbutler
Nursling, SO16 0TF, United Kingdom
Last month
Applications closed

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Posted
23 Mar 2026 (Last month)

Senior Software Engineer

Rate: £450 a day

IR 35 Determination: Outside IR35

Location: Southampton

Working Pattern: 20% onsite

Clearance: SC Clearance required

Stack overview: Python (including pytest), git, Docker and AWS with prior experience building full stack Flask

You will join a global defence technology consultancy and take ownership of specific software work packages, including low level planning, delivery, and reporting, with ability to work independently and autonomously.

You will have strong understanding of microservice software architecture, and design, implement, document and test software modules and components.

What you'll bring

Strong technical ability with proven experience delivering software components and modules.

Ability to work confidently, strategically and autonomously

Ability to balance hands-on coding with document writing and planning session participation

Your skills and experience:

Proficiency in Python (including pytest), git, Docker and AWS with prior experience building full stack Flask applications

Experience designing, implementing, and testing software components

Knowledge of secure coding practices and cyber security considerations

Familiarity with version control and configuration management (Git, AWS)

Experience integrating software within larger systems and platforms

Understanding of Agile delivery methods

Desirable:

Experience or knowledge CI/CD pipelines and build tools (GitLab CI, Jenkins, AWS)

Understanding and awareness of Machine Learning pipelines

Familiarity with containerisation and cloud platforms (Docker, Kubernetes, AWS, Azure)

Exposure to additional automated testing frameworks (Selenium, Junit, NUnit)

ISTQB Foundation/Advanced or equivalent testing knowledge

Experience mentoring early-career engineers

Awareness of model-based engineering or architecture tools (UML, SysML)

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