Senior/Staff Applied AI Engineer, Full-Stack

About The Job
The client is hiring for this role. Harper is an AI career agent that works for you — the candidate. Skip the application form: just talk to Harper, and it puts strong candidates straight in front of the client — plus other frontier roles worth your time.

Job Title
Senior/Staff Applied AI Engineer, Full-Stack

Salary
Competitive base + Equity — top-tier comp at a world-leading AI lab

Location
Seoul (On-site)

Company Description
One of the world's most important AI labs — European, building open-weight, open-source frontier models that go head-to-head with the best closed labs. They train the models, not wrap them. Teams across France, the US, UK, Germany, and Singapore — now building in Seoul. Low-ego, ship-fast, research-meets-production.

What You'll Do

• Take frontier models into real enterprise software and own the integration end to end.
• Design and ship scalable full-stack systems where front-end and back-end actually fit together.
• Build the hardest customer use cases and get them to production accuracy.
• Set the technical bar and level up the engineers around you.
• Push field learnings back into the product with research and product teams.

Who You Are

• 5+ years as a hands-on IC on cutting-edge tech.
• Strong in Python and TypeScript; comfortable across React / Next.js / Vue and Node.js.
• Deep software fundamentals — design patterns, data structures, algorithms.
• You can explain a gnarly tradeoff to an engineer and a CTO in the same meeting.
• Fluent in English.
• Bonus: LLM/GenAI experience, open-source contributions, or a Forward Deployed / Sales / Solutions Engineer or Technical PM background.

Why Join

• Build on genuinely open-weight frontier models, as a senior engineer on the ground.
• Bring frontier AI to Korean enterprises from the front line.
• Work directly with a global team across France, the US, UK, Germany, and Singapore.
• Low-ego, ship-fast culture. Competitive comp + equity.