Contract Software Developer

Company: iO Associates – UK/EU
Apply for the Contract Software Developer
Location: Milton Keynes
Job Description:

Overview


Title: Lead Principal Consultant – Government, Defence & Security


Role: Contract Software Developer


Clearance: UK*C DV


Day rate: £500 to £600 | Outside IR35 | DOE


Responsibilities



  • Design, develop, and maintain software using C# .NET Core (v6+) or C++ (C++11+), with opportunities to work on .NET Core 8 microservices.

  • Build APIs and microservices aligned with business and technical requirements.

  • Embed secure coding practices into all development activities and CI/CD pipelines.

  • Participate in code reviews, architecture discussions, and team retrospectives to drive quality and maintainability.

  • Write unit and integration tests to ensure reliable, production-ready software.

  • Stay up-to-date with modern development practices, frameworks, and security trends.


Qualifications



  • Experience with cloud platforms (AWS, Azure, GCP) and containerization (Docker, Kubernetes).

  • Exposure to security tools (SAST, DAST, dependency scanning).

  • Knowledge of compliance frameworks (ISO 27001, NIST).

  • Certifications in software development, cloud, or security.


Please note: this role requires active UK*C DV Clearance.


If this sounds of interest, or you hold the right clearance but are looking for a slightly different role, please reach out for a confidential conversation to find out more!


Additional details



  • Seniority level: Mid-Senior level

  • Employment type: Contract

  • Job function: Information Technology and Strategy/Planning

  • Industries: IT System Custom Software Development, Software Development, and IT Services and IT Consulting

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Posted: September 5th, 2025