Backend Developer - EN

We are looking for a skilled and execution-driven Backend Engineer to design, build, and scale core backend services powering AllScales business. This role requires strong backend engineering fundamentals, hands-on experience with production systems, and the ability to work in high-performance, scalable environments.
Responsibilities

Design, develop, and maintain core backend services, including API design, business logic implementation, and system optimization.
Build high-performance and scalable backend services using Python (FastAPI, Django, Flask) or Go (Gin, Echo, Fiber).
Participate in database schema design, optimization, and maintenance using relational databases (MySQL, PostgreSQL) and NoSQL solutions (MongoDB, etc.) where appropriate.
Write and maintain clear API documentation, unit tests, and integration tests to ensure system stability and long-term maintainability.
Analyze system performance and address challenges related to high concurrency, high availability, and scalability.
Contribute to backend architecture design and refactoring, promoting microservices, modularity, and standardization.
Collaborate closely with frontend, product, QA, and DevOps teams to deliver features with high quality and on schedule.
Troubleshoot, debug, and resolve production issues to ensure system reliability and uptime.
Requirements

• Bachelors degree in Computer Science or a related field is preferred.
• 3+ years of hands-on backend development experience in production environments.
• Strong proficiency in Python or Go; experience with both is a plus.

~ Practical experience with backend frameworks:

• Python: FastAPI, Django, Flask
• Go: Gin, Echo, Fiber, or similar

Solid knowledge of relational databases (MySQL, PostgreSQL), strong SQL skills, and experience with query optimization.
Experience working with caching systems such as Redis, including understanding common caching challenges (cache penetration, breakdown, avalanche).
Familiarity with distributed system concepts: microservices, message queues (Kafka, RabbitMQ, RocketMQ), task queues, and idempotency design.
Basic Linux operation skills and familiarity with Docker, Kubernetes, and CI/CD pipelines.
Strong coding standards, attention to testing and documentation, and a systematic problem-solving approach.
Nice to Have

Hands-on experience with high-concurrency, high-availability, and large-scale data systems.
Experience with microservices governance, including service discovery, circuit breaking, rate limiting, and observability (logging, monitoring, tracing).
Experience leading or deeply contributing to the design and implementation of complex systems from 0 to 1.
Open-source contributions, technical blogging, or public speaking experience.