Senior Software Engineer (C# / .NET) - Contractual Role

About the role

Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies - from emerging startups to large Fortune 50 firms - and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability. We are looking for a skilled Senior C# / .NET Engineer to support a critical platform security and modernization initiative. This role focuses on backend/API enhancements, security implementation, and system reliability improvements in alignment with Azure- based infrastructure and data protection standards.

Responsibilities

•  Design and develop secure backend services and APIs using C# / .NET.
•  Implement authentication and authorization mechanisms (SSO, RBAC, OAuth,
• JWT).
•  Integrate applications with Azure Active Directory (Entra ID).
•  Remove hardcoded secrets and integrate with Azure Key Vault.
•  Implement audit logging and monitoring hooks across services.
•  Build and enforce secure API communication standards.
•  Implement PII masking and secure data handling logic in applications.
•  Secure and optimize third-party integrations (Stripe, SendGrid, Twilio, etc.).
•  Support environment separation and deployment improvements.
•  Collaborate with DevOps and DB teams on security, DR, and compliance
• initiatives.
•  Participate in debugging, incident resolution, and root cause analysis.

Requirements

•  5+ years of experience in C# / .NET development.
•  Strong experience with ASP.NET Core, Web APIs, and microservices
• architecture.
•  Experience implementing authentication & authorization (OAuth, JWT, SSO).
•  Hands-on experience with Azure services, especially Azure AD (Entra ID).
•  Experience with secure coding practices and data protection.
•  Familiarity with API integrations (Stripe, SendGrid, etc.).
•  Experience with logging frameworks and monitoring tools.
•  Understanding of CI/CD pipelines and cloud deployments.
•  Strong debugging, problem-solving, and communication skills.
• Good to Have
•  Experience with containerization (Docker, Kubernetes)

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