Senior Python Engineer

Location: Hanoi or Ho Chi Minh City, Vietnam. Workplace Type: On-site initially (first 2–3 months), then hybrid.

We are looking for a Senior Python Engineer to help design, build, and scale the foundational backend systems powering AI across our platform. In this role, you will work closely with our CTO and engineering leads to shape key technical decisions around AI architecture, LLM orchestration, model evaluation, and backend scalability. You will serve as a core technical anchor, developing reliable frameworks and internal services that enable product squads to safely, efficiently, and rapidly deliver LLM-powered features.

This role is ideal for an engineer who thrives on owning complex system challenges, enjoys optimizing production services, and wants to make a substantial technical impact in applied AI engineering.

• Architect & Scale AI Infrastructure: Design, implement, and maintain robust Python/FastAPI microservices and backend systems that integrate LLMs and generative AI capabilities directly into live workflows.
• Model Evaluation & Quality Frameworks: Build automated pipelines and tooling to continuously measure, evaluate, and improve LLM output accuracy, consistency, latency, and safety.
• Developer Tooling & Frameworks: Develop internal libraries, abstractions, and standardized patterns that empower engineering squads to ship AI features quickly and reliably.
• Production Performance & Cost Optimization: