Senior Backend Engineer (AI)

Location: On-site in Shanghai, China

Company

hirify.global is an independent video game development company specializing in full-cycle game development, art production, and co-development services for console, PC, and mobile games.

What you will do

• Build and maintain scalable Python services and secure RESTful APIs with FastAPI.
• Own backend features from technical design and implementation through testing, deployment, and ongoing support.
• Integrate LLMs and other AI services, designing reusable interfaces, structured schemas, tool interfaces, and streaming workflows.
• Develop reliable AI workflows and multi-agent systems while managing context limits, rate limits, timeouts, retries, provider failures, quality, latency, and cost.
• Improve database access, caching, asynchronous processing, observability, regression coverage, CI/CD pipelines, and containerized deployments.
• Collaborate with product, frontend, AI, and infrastructure teams, conduct code reviews, document technical decisions, and mentor junior engineers.

Requirements

• 5+ years of professional backend development experience, including 2+ years developing AI-powered applications or services, with ownership of service design, production deployment, and ongoing maintenance.
• Strong Python and FastAPI expertise, including asynchronous programming, type annotations, Pydantic, dependency injection, and RESTful API design.
• Practical experience integrating AI APIs or SDKs, including prompt design, structured outputs, and streaming or asynchronous workflows.
• Understanding of LLM challenges, including context management, hallucinations, prompt injection, rate limits, and token costs.
• Hands-on public cloud experience such as AWS, Azure, or GCP, including deploying and operating backend applications.
• Database experience with PostgreSQL or another relational database, including data modeling and query optimization.
• Knowledge of secure API design, authentication and authorization, and secrets management.
• Experience designing reliable backend services and external API integrations, including concurrency control, timeouts, retries, idempotency, and rate limiting, with the ability to explain design tradeoffs.
• Experience with pytest or equivalent testing tools, Git, CI/CD, and Docker.
• Strong problem-solving skills and the ability to independently navigate, extend, and improve an existing codebase.
• Strong written and verbal communication skills in both English and Chinese, including the ability to explain technical decisions and tradeoffs across teams.

Nice to have

• AWS experience, particularly with S3, SageMaker, DynamoDB, ECS, CloudWatch, or Secrets Manager.
• Frontend development experience with Vue or React, including TypeScript or JavaScript.
• Experience with agent frameworks such as LangGraph, Pydantic AI, Claude Agent SDK, or comparable tools, including multi-agent orchestration, task delegation, and context sharing.
• Experience with retrieval-augmented generation, embeddings, and vector databases such as pgvector.
• Experience deploying local or self-hosted LLMs with tools such as vLLM, Ollama, or llama.cpp.
• Experience with multimodal AI, including image, audio, or 3D generation.

Culture & Benefits

• On-site work in Shanghai with reasonable and flexible working hours.
• Customized training programs, regular workshops, and international mobility opportunities.
• Relocation support, comprehensive medical healthcare, group fitness, and wellness activities.
• Multicultural environment with 14 nationalities represented and collaboration with industry veterans.
• Gaming corners with consoles and canteens, plus opportunities to contribute to AAA games.