Projects

A journey through the products, platforms, and intelligent systems I've designed, engineered, and brought to production.

AI SaaS · WeCommit

Fundscout

Role: Full-Stack AI Engineer

Timeline: April 2026 – Present

Production-grade AI platform (WeCommit SBIR) that automates federal SBIR/STTR grant discovery and proposal generation for small businesses. Features persistent deep agent conversation memory, real-time multi-user document editing via Yjs CRDTs + Hocuspocus WebSockets, and custom Gemini model routing.

Key Contributions & Technical Impact

Architected a 5-layer middleware deep agent stack (Todo, Filesystem, SubAgent, Skills, Memory) using LangGraph and PostgreSQL checkpointing.
Built custom GeminiRoutingModel supporting runtime Gemini 2.5 Pro vs Flash model selection and dynamic thinking budgets.
Engineered custom streaming protocols mapping LangGraph event streams to Vercel AI SDK DataStreamContext (<3s for 50KB proposals).
Integrated real-time collaborative document editing utilizing Yjs CRDT + Hocuspocus WebSockets (<100ms sync latency).
Developed custom Tiptap 3 rich-text editor extensions for inline artifact embeds, code rendering, and real-time AI content injection.
Resolved async PostgreSQL pooling bottlenecks by implementing automated retry states with exponential backoff, raising uptime to 99.2%.

React 19TypeScriptTiptap 3FastAPILangGraphGemini AIPostgreSQLYjsHocuspocusAlembicPlaywright

2026 – PresentAI SaaS

AI SaaS · WeCommit

StageX

Role: Technical Lead & Core Architect

Timeline: March 2026 – Present

AI-powered startup execution SaaS platform serving 200+ founders during an 8-week accelerator program. Integrates dynamic AI planning with LangGraph agent co-founders, a visual React Flow canvas, real-time streaming, and stateless mentor coordination loops. Deployed live on https://stagex.kr.

Key Contributions & Technical Impact

Engineered dynamic, multi-agent SaaS orchestration pipelines using LangGraph and the Vercel AI SDK.
Designed a 4-node deep research agent (SearchQuery → WebSearch → Synthesis → Report) with a pre-deduction credit ledger system.
Implemented real-time roadmap generation with progressive streaming using Vercel AI SDK (streamObject), rendering large plans in <2s.
Developed an interactive tree layout engine using React Flow for visual drag-drop roadmap synchronization with Prisma DB.
Engineered token-based mentor invitation/auth system (httpOnly cookies) with dynamic cohort filtering and dashboard feedback UI.
Integrated Paddle subscription checking and transactional checkouts with idempotent event webhook handlers.

Next.js 14React 18TypeScriptLangGraphReact FlowPrismaPostgreSQLPaddleNextAuthVercel

AI SaaS · WeCommit

GenDoc (젠닥)

Role: Lead Full-Stack UI & Integrations Engineer

Timeline: March 2025 – January 2026

AI-powered government grant automation and enterprise document collaboration platform designed for startups and SMBs. Streamlines grant discovery, automates proposal drafting matching complex rubrics, and hosts a secure, collaborative rich-text office editor with full revision rollbacks.

Key Contributions & Technical Impact

Engineered a premium, responsive React workspace using Radix UI accessible primitives and Tailwind CSS v4, with elegant Framer Motion transitions.
Architected and implemented a fully compliant Express.js WOPI Host integrated with AWS S3, streaming active office documents securely into Collabora iframe editors.
Developed concurrency collision locking using custom timestamp headers to coordinate multi-user saves and auto-merge actions.
Constructed an automatic S3 snapshot timeline component, allowing founders to review previous draft histories and restore versions with zero data loss.
Managed security integrations with Better Auth, including Naver/Kakao OAuth systems and Drizzle DDL database schemas on PostgreSQL.
Orchestrated multi-stage Docker configurations and automated deployments to Fly.io Tokyo region for optimal latency (<50ms in Korea) and Vercel staging previews.

ReactExpress.jsTailwind CSS v4Better AuthAWS S3Drizzle ORMPostgreSQLDockerFly.ioVercel

2025 – 2026AI SaaS

2024AI

AI · Image Generation & Community Platform

CROSS-E

Role: Full Stack Engineer

Timeline: August 2024 – September 2024

A creative showcase utilizing advanced generative AI models to convert text prompts into high-fidelity custom images. Integrates a vibrant community feed, real-time social sharing, search index filters, and instant media downloads.

Key Contributions & Technical Impact

Integrated OpenAI's DALL-E image generation API into an asynchronous task queue background system.
Architected media storage and high-speed distribution networks using AWS S3 and AWS CloudFront CDN cache.
Developed a lightweight, high-performance community feed with MongoDB and Express.js to scale concurrent requests.

React.jsNode.jsExpress.jsMongoDBDALL-EAWS S3AWS CloudFront

Hardware · Cryptography & Networks

Raspberry Pi Cloud Storage

Role: Lead Security Engineer

Timeline: January 2023 – April 2023

A self-hosted personal storage cloud solution constructed on Raspberry Pi hardware to serve as a private, secure, and cost-effective alternative to public commercial cloud services.

Key Contributions & Technical Impact

Configured robust multi-layer cryptographic partitions utilizing VeraCrypt, OpenSSL, and custom Unix scripts.
Optimized light local network topologies with dynamic DNS and secure Apache servers behind a self-administered MySQL DB.
Developed custom PHP services to handle automated backup synchronizations and user permission levels.

Raspberry PiApachePHPMySQLOpenSSLVeraCrypt

2023Hardware

2022Full Stack

Full Stack · Cloud & DevOps

Inventory Management System

Role: Lead Engineer — DevOps & Deployments

Timeline: August 2022 – December 2022

An enterprise-grade inventory planning and logistics platform featuring dual-role interfaces for administrators and suppliers, secure authentication layers, and an automated stock replenishment system.

Key Contributions & Technical Impact

Containerized backend modules with Docker and orchestrated microservices across multi-node Kubernetes clusters.
Architected secure, granular Role-Based Access Control (RBAC) portals for suppliers and organization managers.
Deployed scalable cloud infrastructure on IBM Cloud backed by automated GitHub Actions CI/CD pipelines.

PythonIBM CloudDockerKubernetesJavaScriptHTML/CSS