Senior Backend Engineer

We’re looking for a senior backend engineer who can independently own the architecture of a complex product and drive deep performance optimization work on our AI products. This role goes beyond writing code - it requires product thinking, the ability to stay on top of every detail across the product, and the ability to coordinate frontend and backend teams to take a product from design through to a polished, shipped release., 1. Own the design and implementation of the product’s overall backend architecture, addressing the challenges of high-concurrency, high-complexity systems while ensuring scalability, stability, and maintainability.

1. Make effective use of AI-assisted development tools to improve engineering efficiency and code quality, and stay current on best practices in AI-assisted engineering.
2. Analyze and optimize AI product performance - inference speed, resource consumption, response latency, and other bottlenecks - to continuously improve overall system efficiency.
3. Bring a product design mindset to technical decisions, balancing business requirements against technical feasibility rather than simply implementing specs as given.
4. Oversee the fine-grained details of the product development process and take full ownership of product quality and final delivery outcomes.
5. Coordinate frontend and backend engineers on scheduling and API alignment, lead integration testing and QA, and ensure the product ships on time and at a high bar of quality.
6. Participate in technical design reviews and roadmap planning, driving the continued evolution of both the product and its technology.

1. 3-5 years of backend development experience, including experience independently architecting and shipping a complex product from the ground up.
2. Strong system design skills, with a solid understanding of common patterns and solutions for high-concurrency, distributed systems.
3. Proficient with AI-assisted development/coding tools, with a track record of applying them on real projects to improve engineering efficiency.
4. Experience optimizing the performance of AI products, with a clear understanding of the key factors affecting AI application performance and the ability to propose effective solutions.
5. Strong product design sensibility - able to evaluate requirements and technical approaches from a user and product perspective, not just an engineering one.
6. Strong project ownership and execution skills, able to independently manage the details and progress of complex projects and take responsibility for outcomes.
7. Strong cross-functional collaboration and communication skills, able to effectively coordinate frontend and backend resources and drive integration testing and delivery.
8. Fluent in Chinese (required).
9. High sense of ownership and self-motivation, able to maintain quality with minimal oversight.

Nice to Have

• Experience independently leading a team or taking a product from 0 to 1 launch.
• Experience with AI / large language model-based products.
• Experience building creator or freelancer marketplace products.