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hyungchulc/README.md

Hyungchul Choi

Business and data analyst in Stockholm, building decision-ready dashboards, strategy, and verifiable local-first AI systems.

I work where business judgment meets analytical discipline. My background spans Power BI reporting, campaign analytics, stakeholder-led consulting, and public tools for agent memory, retrieval evaluation, and privacy-bounded local context.

Selected public work

Project What it does
Voice Relay A native macOS voice layer that keeps quick conversation in Realtime and hands substantive work to Codex.
Memory Forest A verifiable, local-first memory architecture for long-running AI agents.
Memory Retrieval Lab Reproducible evaluation for retrieval quality, ranking, freshness, and multilingual fixtures.
Aria YouTube Skill A local-first evidence pipeline combining captions, local transcription, and sampled frames.
Codex Context for ISTM A macOS pipeline for bounded, provenance-aware Codex session context.
Mac Context for ISTM A privacy-bounded Swift collector for selected Apple app context.

Experience in practice

  • Built and integrated two interactive Power BI dashboards at Atlas Copco Group, consolidating and validating financial and tax data across subsidiaries.
  • Planned 50+ data-driven campaigns and executed 100+ Coupang campaigns at Versuni, using Tableau and SAP Analytics Cloud to support decisions.
  • Collected 100+ competitor data points through web crawling and developed an interactive dashboard for market insight.
  • Completed live consulting projects with Lindemann, LiNPhA, Wolt, and Super Synbiotics, combining stakeholder interviews, market research, and financial analysis.

Education and tools

  • MSc in Business & Management, Data Analytics track, Stockholm School of Economics
  • 50% merit-based tuition scholarship
  • BBA in Business Administration, Dankook University
  • Python, SQL, Power BI, Tableau, SAP Analytics Cloud, Swift, Figma

Connect

Portfolio · LinkedIn · GitHub

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  1. memory-forest memory-forest Public

    A verifiable local memory architecture for long-running AI agents

    Python 19 3

  2. aria-youtube-skill aria-youtube-skill Public

    Local-first YouTube transcripts, local Whisper fallback, and sampled-frame evidence bundles for coding agents

    Python

  3. codex-context-for-istm codex-context-for-istm Public

    Codex Context for ISTM, a macOS-only local Codex session context pipeline.

    Python

  4. codex-debug-bridge codex-debug-bridge Public

    Personal messaging bridge for one Codex App task with Browser, Computer Use, seven-file authority, and Memory Forest support.

    JavaScript

  5. memory-retrieval-lab memory-retrieval-lab Public

    Reproducible retrieval evaluation for Memory Forest with root-first trails, multilingual fixtures, and ranker adapters.

    Python

  6. voice-relay voice-relay Public

    Native macOS voice interface for the full Codex desktop runtime, with Realtime Voice, persistent sessions, OAuth, live progress, mid-turn steering, and no OpenAI API key to manage.

    Swift