C# / .NET Developer -- API Identity authentication and authorization services
TradeZero America
Job Description
C# / .NET Developer — API Identity authentication and authorization services (Mid-Level)
\n \nAbout the Role
\n \nWe are looking for a mid-level C# / .NET developer to build and maintain high-performance API services that power our trading platform. You will work on various .NET API services other across the platform, specifically around our identity authorization and authentication API. This is a backend-focused role. You will work with Redis and relational databases to deliver scalable and reliable APIs in a production trading environment. Strong .NET fundamentals and comfort with distributed systems are important.
\n \nWhat You'll Work On
\n• Cross-service features — API services using SQL (PostgreSQL or SQL Server) and Redis, across the broader platform
\n• Redis-backed data access — Reading and serving cached data snapshots with low latency; session and user-state management across data servers
\n• API platform patterns — Building on our internal REST server framework: dual-port public/private hosting, Swagger documentation, compression, CORS, and standardized error handling
\n \nResponsibilities
\n• Design, implement, and maintain REST API endpoints in C# / ASP.NET Core (.NET 8+)
\n• Experience with authorization and authentication best practices including OAuth 2.0, API keys, JWT tokens, MFA, key rotation, etc.
\n• Integrate with Redis for caching, snapshots, and pub/sub patterns using StackExchange.Redis and related libraries
\n• Write and optimize SQL queries and stored procedures against PostgreSQL or SQL Server as needed
\n• Add Swagger/OpenAPI documentation and follow established API conventions
\n• Tune performance for high-throughput, low-latency scenarios (thread pool configuration, connection pooling, async patterns)
\n• Participate in code reviews, troubleshooting production issues, and iterative feature delivery
\n \nRequired Qualifications
\n• 3–5 years of professional experience with C# and .NET (ASP.NET Core)
\n• Solid understanding of REST API design, semantics, and API versioning practices
\n• Comfort with async/await, dependency injection, and standard .NET service patterns
\n• Experience with Redis — caching, key design, connection management, and basic pub/sub
\n• Experience with relational databases — writing queries, understanding indexes, and working with PostgreSQL or SQL Server
\n• Familiarity with Git, CI/CD pipelines, and deploying services to production
\n \nNice to Have
\n• Experience with Polly or similar resilience libraries (retries, circuit breakers)
\n• Experience with performance logging, observability, and production debugging under load
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