Staff~Sr. Staff, Machine Learning Engineer (Ads Engineering)

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Seoul, South KoreaPosted today

Apply on Coupang's career page

Market pay check

Matched to Computer systems and software professionals

Source: Ministry of Employment and Labor wage information system (wage.go.kr), wage distribution by occupation.

What you'd do

Build large-scale Agentic AI systems using multi-agent orchestration,LangGraph,and ReAct frameworks
Develop reward-based optimization models using RLHF and RLAIF to maximize advertiser performance
Lead LLM fine-tuning,distillation,and large-scale distributed inference infrastructure architecture

What they want

10 or more years designing,deploying,and operating production ML systems at scale
Experience building Agentic AI systems: multi-agent orchestration,planning,autonomous reasoning pipelines
Advanced Python skills,test-driven development,CI/CD,and scalable system design experience

Nice to have

Master or PhD in CS,engineering,mathematics,or statistics
Experience in large-scale digital advertising systems architecture
Post-training RL experience: RLHF,RLAIF,or domain-specific reward modeling

Seoulstart's read

Visa tier (likely): E-7 specialty / professional (likely)
Korean language: Business-level Korean required
English friendliness: Medium: English JD, mixed-language workplace
Context: Coupang Ads senior IC working on Agentic AI for ad optimization; explicitly bilingual Korean/English environment at this level.

This is Seoulstart's analysis of the public job description, not the employer's stated policy. Verify visa sponsorship, language requirements, and remote allowances directly with the recruiter.

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