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tipaek (Timothy Paek) · GitHub

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tipaek/README.md

Hi, I'm Timothy Paek

Software Engineer @ Synchrony • Backend Systems • AI/ML Background

About

I'm a Software Engineer building backend systems for digital payments (tokenization, API platforms, partner integrations).

I focus on:

  • reducing operational friction
  • automating repetitive workflows
  • making systems easier to understand and use

Recently:

  • Built an API testing framework that reduced regression time from ~90 min → ~2 min
  • Led multi-client integrations across distributed payment systems
  • Improving internal developer tooling and documentation at scale

Before that, I published ML research on detecting LLM-generated code (Springer Nature), achieving 99% accuracy on large-scale datasets.

What I'm Interested In

  • AI-assisted developer workflows
  • Backend systems at scale
  • Developer tooling & automation
  • Practical applications of LLMs in production

Projects

CodeClimb

Full-stack NeetCode tracker designed to reduce friction in interview prep
Tech: React, TypeScript, Spring Boot, Postgres

  • Multi-list tracking, activity calendar, streaks, "Up Next" queue
  • OpenAPI contract-first design to prevent FE/BE drift
  • Built using an agentic dev workflow (OpenAI Codex)

Rankhwa

Manhwa discovery and rating platform
Tech: React, Spring Boot, PostgreSQL

  • Search, filtering, user ratings, custom lists
  • JWT + Google OAuth auth system
  • Full-stack system design and deployment

LLM Code Detection Research

First-author published research on detecting AI-generated Java code

  • 99% accuracy, 0.999 AUC (Springer Nature)
  • Created datasets with 76K+ files
  • Reduced feature dimensionality 1000x while improving performance

Tech Stack

Backend

  • Java, Spring Boot
  • REST APIs, Microservices
  • PostgreSQL

Tools & Infra

  • Postman (automation/testing)
  • HashiCorp Vault
  • AWS

Other

  • Python (ML, automation)
  • OpenAI APIs / LLM workflows

Contact

Notes

I like working on hard problems, especially where systems, tooling, and AI intersect.

Pinned Loading

  1. NestedBigramsResearch NestedBigramsResearch Public

    Code for "Detection of LLM-Generated Java Code Using Discretized Nested Bigrams" (arXiv:2502.15740). Achieves state-of-the-art performance in distinguishing human vs. LLM-written Java.

    Java 1

  2. LeetCode_Brainrot LeetCode_Brainrot Public

    🎧 AI-powered podcast that explains all NeetCode 150 problems in TED-Ed style. No code — just clear, intuitive algorithm explanations you can listen to on the go.

    Python 1

  3. Rankhwa Rankhwa Public

    Rankhwa — Full-stack manhwa/webtoon discovery and ratings platform. Built with React + TypeScript (Vercel) and Spring Boot + PostgreSQL (GCP), featuring search & filters, JWT + Google OAuth, per-us…

    TypeScript

  4. GPT-Java-Dataset GPT-Java-Dataset Public

    A dataset composed of Java source code and GPT altered code for classification training.

    Java 1 1

  5. GPT-Java-GCJ-Dataset GPT-Java-GCJ-Dataset Public

    A dataset for testing large-scale GPT 4o detection.

    Java 1 1

  6. UchimuraTribute UchimuraTribute Public

    A Kohei Uchimura tribute page in html/css/js.

    HTML

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