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Role Description

We are seeking a Mid-Level Backend Engineer (3–5 years of experience) to join our engineering team. This role focuses on designing, developing, and optimizing scalable backend services that power our core business systems.

• Design and develop backend services for core business systems, including API design, business logic implementation, and system optimization.
• Build high-performance, scalable services using:
  • Python (FastAPI, Django, Flask), or
  • Go (Gin, Echo, Fiber).
• Design and optimize database schemas using relational databases (MySQL, PostgreSQL) and NoSQL databases (MongoDB).
• Write and maintain API documentation, unit tests, and integration tests to ensure service reliability and maintainability.
• Perform performance analysis and optimization to address high-concurrency and high-availability challenges.
• Participate in system architecture design and refactoring, promoting microservices, modularization, and standardization.
• Collaborate closely with frontend, product, QA, and DevOps teams to deliver high-quality features on schedule.
• Troubleshoot production issues and ensure stable system operation.

Qualifications

• Bachelors degree or above in Computer Science or a related field (preferred).
• 3–5 years of backend development experience.
• Strong proficiency in either Python or Go, with hands-on production experience.
• Experience in both is a strong plus.
• Familiarity with common web frameworks:
  • Python: FastAPI, Django, or Flask.
  • Go: Gin, Echo, Fiber, or similar frameworks.
• Solid experience with relational databases (MySQL, PostgreSQL), strong SQL skills, and query optimization capabilities.
• Experience with Redis and understanding of caching strategies (cache penetration, breakdown, avalanche, etc.).
• Understanding of distributed system concepts such as:
  • Microservices architecture
  • Message queues (Kafka, RabbitMQ, RocketMQ)
  • Task queues
  • Idempotency design
• Familiar with Linux environments.
• Basic knowledge of containerization and DevOps practices (Docker, Kubernetes, CI/CD).
• Strong engineering mindset with good coding standards, testing awareness, and systematic problem-solving skills.

Preferred Qualifications (Nice to Have)

• Experience working in high-concurrency, high-availability, or large-scale data environments.
• Experience with microservices governance (service discovery, circuit breaking, rate limiting).
• Experience building observability systems (logging, monitoring, tracing).
• Experience leading or deeply participating in complex system design from 0 to 1.
• Contributions to open-source projects, technical blogs, or technical sharing experience.