JaeGwon C.
LLM Evaluation & Data Contractor
Experience
LLM Evaluation & Data Contractor
Outlier AI; DataAnnotation Technologies; Invisible Technologies
- Worked in domains including coding, STEM, generalist, and KR/EN bilingual (voice + text)
- Real-time face detection & recognition
- Authored high-fidelity system/user prompts and rubric frameworks to improve evaluation research foundation consistency
- Performed structured comparative judgments (A/B, multi-turn) with rationales; compared and refined AI responses based on rubrics
- Produced and reviewed KR/EN voice recordings, transcripts, and others' work
- Identified recurring model failure modes (logical chain breaks in STEM, hallucinated code libraries, bilingual register shifts) and escalated pattern summaries leading to rubric refinement
- Created reusable error taxonomy (hallucination / reasoning gap / spec noncompliance / tone mismatch / unsafe content leakage)
Software Engineer (Backend – Ad Server)
Kakao Corp
- Backend developer working on an ad server
Trainee
SW Maestro (11th)
- Implemented face detection in a web browser
- Worked on video conferencing
Software Engineer (Internship)
Kakao Enterprise
- API gateway development
- Search in Hamming space
Student Researcher
Parallel Software Design Lab, University of Seoul
- Real-time face detection & recognition
- GPU computing
Summary
Results-driven bilingual (KR/EN) LLM evaluation specialist and backend engineer (4+ years at Kakao Ad Server). Strengths include high-fidelity prompt and rubric design, structured comparative judgment (A/B, multi-turn), and clean multilingual (voice + text) data generation. Earned more than USD 10,000 as a consistent contributor across coding, STEM, generalist, and bilingual evaluation streams. First author in real-time face recognition; proven algorithmic problem solving (Grand Prize, UOS). Blend of production and review latency-aware systems mindset and linguistic nuance for scalable model quality improvement.
Failure mode identification (logic chain breaks, hallucinated code libraries, register shifts)
Error taxonomy (hallucination, reasoning gap, spec noncompliance, tone mismatch, unsafe leakage)
Languages
Education
University of Seoul
Bachelor's Degree · Electrical & Computer Engineering · Korea, Republic of · 4.04/4.50
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