AI Product Engineer

Deciding what to buildis part of my job.

I dug the opportunity out of the market, built the product for it, and closed the first contract. To hold that pace alone, I built the AI-driven development system I work inside.

Career

  • AbearAI Product EngineerMay 2025 – Present1 yr 3 mos

    Back for a third time after an internship and a contract engagement — now running the Pervis marketing-AI business and shipping features on Windly.

  • AndreiaBackend & ML Engineer, TPMMay 2023 – Sep 20235 mos

    Led the product engineering team for Ssokdak-Ssokdak, a digital therapeutic that treats early-stage depression through emotion journaling.

  • AbearBackend Engineer, InternJan 2023 – Aug 20238 mos

    Shipped features inside Windly, a B2B SaaS platform for e-commerce sellers.

  • TULONCo-founder, Full-stack EngineerJan 2022 – Sep 20229 mos

    Co-founded TULON, a secure data access platform for machine learning researchers.

Education

KAISTKorea Advanced Institute of Science and TechnologyMar 2018 – Feb 2026Graduated

B.S. in Electrical Engineering & Computer Science (double major) · B.S. in Mathematics (minor) · GPA 3.6 / 4.3

Sejong Academy of Science and ArtsMar 2015 – Feb 2018Graduated

Selected work

Six pieces, each opening into what the problem was, what I decided, and what changed.

Timeline

Bar length is proportional to real duration. Overlapping bars ran in parallel — including two contract projects delivered during military service in 2023–2025.

  • Abear1 yr 3 mos
  • Slyric4 mos
  • LLM translation cleanup3 mos
  • Category recommender v23 mos
  • KATUSA1 yr 7 mos
  • Andreia5 mos
  • Multimodal emotion analysis5 mos
  • Counselling summary and diarization5 mos
  • Sabeujak3 mos
  • Abear8 mos
  • Punctuation restoration research4 mos
  • TULON9 mos
Employment Contract Service

Stack & languages

Programming LanguagesTypeScript, Python, JavaScript, Go, C/C++
ML / DLPyTorch, Langchain, ONNX, BentoML, Streamlit
WebReact, Next.js, HTML5, CSS
ServerNest.js, FastAPI, Django, Fiber, Flask, Express
Cross Platform AppReact Native, Flutter
DatabasePostgreSQL, Supabase, MySQL, MongoDB, DynamoDB, Firebase
Cloud ProvidersAWS, GCP
ObservabilitySentry, Langfuse, Datadog, Axiom, New Relic
DevOps & InfraDocker, Github Actions, Jenkins, RabbitMQ
CollaborationSlack, Notion, Jira, Confluence
LanguagesKorean (Native), English (Intermediate), Chinese (Intermediate)

Awards

TecChat — an LLM chatbot for field technical manuals

  • Printed field manuals barely circulate and rarely get used; we digitised them, fed them to an LLM, and shipped a chatbot with its own app
  • Owned the LLM research and built the prototype
  • Advanced to the national K-Startup competition (Ministry of National Defense track)

MyVoice — blocking voice-model training with adversarial audio

  • Built a system that poisons AI training with adversarial audio, aimed first at VTubers, whose voice is the asset
  • Owned the research into adversarial audio generation and ran the PoC

TurninPoint — hiring developers on portfolio work rather than tests

  • Coding tests say little about real ability, so we built hiring around company-specific project work instead
  • Built the MVP full-stack and drove product direction from user interviews

Military service

Battalion S1 Human Resource Specialist (42A)

  • Handled personnel records and administrative support for a battalion of 400+

Senior KATUSA

  • Trained, led, and managed the KATUSA soldiers assigned to the battalion