Senior C# Engineer

About the Role We are looking for a C# Backend Engineer to build and optimize high-performance distributed systems that power mission-critical applications. You will work on backend services handling high concurrency, high QPS (Queries Per Second), and low-latency transaction processing , while ensuring scalability, reliability, and system stability. Responsibilities Design, develop, and maintain scalable backend services using C# (.NET Core/.NET 6/7/8) . Build and optimize high-concurrency, high-throughput distributed systems capable of handling large-scale traffic. Design RESTful APIs and microservices with a focus on performance, scalability, and maintainability. Optimize application performance, including multithreading, asynchronous programming, memory management, and garbage collection. Analyze and optimize SQL queries, indexing strategies, and database performance for high-volume workloads. Troubleshoot production issues, conduct root cause analysis, and improve system reliability. Collaborate with cross-functional teams to deliver high-quality software following Agile development practices. Participate in code reviews and contribute to engineering best practices. Requirements Minimum 3 years of backend development experience using C#/.NET . Strong experience developing high-concurrency, high-QPS, or high-traffic backend systems . Solid understanding of multithreading, asynchronous programming (async/await), concurrent collections, and performance tuning . Good knowledge of distributed systems, microservices architecture, caching, and messaging systems . Experience with relational databases such as SQL Server, PostgreSQL, or MySQL , including SQL optimization and indexing. Familiarity with Redis , message queues (Kafka/RabbitMQ), or similar middleware is highly preferred. Experience with Docker, Kubernetes, CI/CD , and cloud platforms (Azure, AWS, or GCP) is a plus. Strong problem-solving skills and the ability to diagnose performance bottlenecks in production environments. Excellent communication skills and the ability to work in a collaborative engineering team. Mandarin Chinese speaking ability is required to collaborate with Mandarin-speaking stakeholders and regional engineering teams. If you’re interested in this opportunity, please send your CV to roxyzhou@trulyyy.com Regrettably, only shortlisted candidates will be notified. Please note that data provided is for recruitment purposes only. Business Registration No.: 202004228R | License. No. - 20S0118 | EA Registration No. - R22104027