Tech Lead, Machine Learning Engineer - Global E-Commerce (Conversational AI)

About the team

We are building the next generation of conversational AI for Global E-commerce — a unified Agent system that learns from every interaction, runs in 30+ languages, and is deployed across one of the largest e-commerce surfaces on the internet. Our 2026 north star is a self‑evolving Agent: post‑training, harness, tools, memory, and evaluation form one closed loop, and every served conversation becomes training, evaluation, and retrieval signal for the next iteration.

Business surface — buyer, seller, dispute & appeals, operations — is the substrate. Our work is foundational LLM + Agent engineering: post‑training, agent harness, tool design, memory, evaluation, inference, multilinguality. We are hiring people who want to push the SOTA of these systems in production, at scale, with hundreds of millions of users in the loop.

What we work on

• LLM post‑training & alignment — large‑scale SFT, DPO/IPO/KTO, online RL (RLHF / RLAIF / RLVR), ...