Senior .NET Developer

We are building an AI-powered healthcare platform where security, privacy, and data protection are important parts of the product. We are looking for a Senior .NET Developer to join the engineering team and work on backend development with a strong focus on application security. You’ll work with an existing .NET codebase, implement security improvements, strengthen application architecture, and contribute to secure development practices across the product. This is a hands-on engineering role where you’ll implement solutions directly in the codebase, not just identify security issues.

Responsibilities

Develop and maintain backend functionality using C# and .NET Core; Design and implement secure authorization architecture, including authorization policies, handlers, and resource-based authorization; Implement application security improvements across the existing codebase; Strengthen secrets management, encryption, and protection of sensitive application data; Improve security monitoring, logging, and proactive alerting; Introduce static analysis, dependency scanning, and security controls into the CI/CD pipeline; Improve application security across Azure AD B2C, Key Vault, and related services; Collaborate with the engineering team on threat modeling, security reviews, and secure feature development.

Requirements

4+ years of commercial experience with C# and .NET Core; Strong knowledge of .NET Core, backend architecture, and authorization; Experience working with authorization policies, handlers, and resource-based authorization; Experience with Azure services, including Azure AD B2C and Key Vault; Understanding of application security principles, secrets management, encryption, and secure coding practices; Experience working with CI/CD pipelines and implementing security or quality controls; Experience working with large existing codebases; Upper-Intermediate level of English.

Nice to have

Experience identifying and fixing authorization or multi-tenant data isolation issues; Experience with static analysis, dependency scanning, or vulnerability management; Experience with key rotation and encryption at rest; Experience with penetration testing or security audit remediation; Experience securing Angular or other SPA applications; Familiarity with SOC 2, HIPAA, or similar compliance frameworks.

Benefits

Paid vacation – 18 days + 1 additional day for each year with us; Paid sick leave (14 days per year); Wellness program (sports, healthcare); 50% compensation for educational activities; Teambuildings and corporate events