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Hi there, I'm Jae Gwon Choi, a bilingual KR/EN LLM evaluation specialist and backend engineer with 4+ years at Kakao Ad Server. I design high-fidelity prompts and rubric frameworks, run structured comparative judgments (A/B, multi-turn), and generate clean multilingual voice and text data to drive model quality. I've earned over USD 10,000 as a consistent contributor across coding, STEM, generalist, and bilingual evaluation streams. I'm the first author on a real-time face recognition project and bring a latency-aware systems mindset plus linguistic nuance to scalable model improvements.…Hi there, I'm Jae Gwon Choi, a bilingual KR/EN LLM evaluation specialist and backend engineer with 4+ years at Kakao Ad Server. I design high-fidelity prompts and rubric frameworks, run structured comparative judgments (A/B, multi-turn), and generate clean multilingual voice and text data to drive model quality. I've earned over USD 10,000 as a consistent contributor across coding, STEM, generalist, and bilingual evaluation streams. I'm the first author on a real-time face recognition project and bring a latency-aware systems mindset plus linguistic nuance to scalable model improvements.

Jae Gwon Choi

Back-End Developer, Web Developer, Data Annotator, +2

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Hi there, I'm Jae Gwon Choi, a bilingual KR/EN LLM evaluation specialist and backend engineer with 4+ years at Kakao Ad Server. I design high-fidelity prompts and rubric frameworks, run structured comparative judgments (A/B, multi-turn), and generate clean multilingual voice and text data to drive model quality. I've earned over USD 10,000 as a consistent contributor across coding, STEM, generalist, and bilingual evaluation streams. I'm the first author on a real-time face recognition project and bring a latency-aware systems mindset plus linguistic nuance to scalable model improvements.…Hi there, I'm Jae Gwon Choi, a bilingual KR/EN LLM evaluation specialist and backend engineer with 4+ years at Kakao Ad Server. I design high-fidelity prompts and rubric frameworks, run structured comparative judgments (A/B, multi-turn), and generate clean multilingual voice and text data to drive model quality. I've earned over USD 10,000 as a consistent contributor across coding, STEM, generalist, and bilingual evaluation streams. I'm the first author on a real-time face recognition project and bring a latency-aware systems mindset plus linguistic nuance to scalable model improvements.

Available to hire

Hi there, I’m Jae Gwon Choi, a bilingual KR/EN LLM evaluation specialist and backend engineer with 4+ years at Kakao Ad Server. I design high-fidelity prompts and rubric frameworks, run structured comparative judgments (A/B, multi-turn), and generate clean multilingual voice and text data to drive model quality.

I’ve earned over USD 10,000 as a consistent contributor across coding, STEM, generalist, and bilingual evaluation streams. I’m the first author on a real-time face recognition project and bring a latency-aware systems mindset plus linguistic nuance to scalable model improvements.

Skills

Experience Level

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Korean

Fluent

English

Advanced

Work Experience

LLM Evaluation & Data Contractor at Outlier AI; Data Annotation Tech; Invisible Technologies

April 2, 2025 - November 13, 2025

Authored high-fidelity prompts and rubric frameworks to improve evaluation consistency. Performed structured comparative judgments (A/B, multi-turn) with rationales; produced KR/EN voice recordings, transcripts, and reviews. 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).

Back-End Developer at Kakao Corp

December 1, 2020 - November 13, 2025

Backend developer working on an ad server. Contributed to latency-aware backend systems and API stability.

Software Engineer (Trainee) at Kakao Corp

December 31, 2020 - December 31, 2020

Trainee software engineer contributing to backend development and onboarding tasks.

Software Engineer (Intern) at Kakao Enterprise

March 31, 2020 - March 31, 2020

API gateway development. Search in Hamming space.

Student Researcher at Parallel Software Design Lab, University of Seoul

October 1, 2019 - October 1, 2019

Real-time face detection & recognition. GPU computing.