Senior Backend Developer (ASP.NET Core)

Senior Backend Developer (ASP.NET Core / C#)

Role Summary

We’re seeking a Senior Backend Developer with strong expertise in ASP.NET Core and C# (.NET) to design and build stable, scalable, and secure services. Proficiency in SQL, familiarity with Docker and microservices architecture, strong teamwork, and at least 3 years of relevant experience are required. Full-stack experience and familiarity with DevOps concepts are considered pluses.

Responsibilities

• Design, develop, and maintain backend services using ASP.NET Core and C#.
• Model relational databases and optimize queries, indexing, and performance tuning.
• Build APIs (REST/gRPC), manage API versioning, and document with Swagger/OpenAPI.
• Architect and implement microservices (service boundaries, inter-service communication, observability, fault tolerance).
• Containerize services with Docker and prepare them for deployment across environments.
• Ensure quality via unit/integration tests, code reviews, and established design patterns.
• Monitor and improve performance; implement logging, tracing, and error handling.
• Collaborate closely with frontend, product, and DevOps teams to deliver on time and with high quality.

Must-Have Qualifications

• Advanced proficiency in ASP.NET Core and C# (.NET 6+).
• Strong SQL skills with relational DBs (preferably SQL Server): schema design and query optimization.
• Hands-on familiarity with Docker (Dockerfile, images, containers, basic Compose usage).
• Understanding of microservices architecture (service design, resilience, observability).
• Solid grasp of networking and web fundamentals (HTTP, TLS, authentication/authorization, JWT).
• Experience with an ORM (preferably Entity Framework Core) and common patterns (Repository/Unit of Work where appropriate).
• Proficiency with Git and team workflows (branches, PRs, code review).
• 5+ years of professional backend development experience.
• Strong teamwork, ownership, and problem-solving skills.

Nice to Have

• Full-stack exposure (e.g., React/Next.js or similar).
• DevOps familiarity and CI/CD tools (GitHub Actions/Azure DevOps/GitLab CI).
• Experience with message brokers (RabbitMQ/Kafka) and event-driven patterns.
• Caching (Redis) and performance/scalability techniques.
• Cloud experience (Azure or AWS), container orchestration (Kubernetes a plus).
• gRPC, GraphQL, OAuth2/OpenID Connect.
• Application security (OWASP ASVS/Top 10), rate limiting, and secrets management.
• This position is full-time and on-site. 
• This is an on-site position based in Tehran. Working days are from Saturday to Thursday, with working hours from 8:30 to 17:30, and on Thursdays from 8:30 to 14:30.

Tools & Technologies

ASP.NET Core, C#, .NET 6/7/8, SQL Server, Entity Framework Core, REST, Swagger, Git
Plus: Docker, Kubernetes, Redis, RabbitMQ/Kafka, Azure/AWS, CI/CD, gRPC/GraphQL