Founder & CEO of DevsLab — a SaaS development studio in Seoul. I ship production SaaS first, then open-source the parts worth sharing.
- AskLinq — an AI agent that answers visitors from the materials you register and hands anything it can't answer to a person. QR-first, live in production on Cloudflare Workers + PostgreSQL/pgvector. Free beta.
- GitLinq — a Windows Git client for teams coming from SVN: author-first history, and a preview before any change is cancelled. Preview.
- TraceLinq — local visibility, recovery, and replay for Claude Code and Codex work. Early access.
- VisionLinq — a document AI API that turns images, PDFs, and office files into structured fields with source references. Preparing for launch.
- BookLinq — WhatsApp-centered booking for local businesses in India. Preparing for launch.
- Chatur-AI — voice AI for Indian call centers, built with an operating partner. In development.
- SphereLinq — an Agentic OS for the whole company: it connects team and company knowledge, and applies shared rules and harnesses to every AI agent people work with. In design.
We also build and run the operations systems of two dental-logistics companies — EDS Logistics and FM Dental Service.
All of it lives at the devslab open-source hub — live demos, docs, and install links in one place.
- editor-ruler
— Word-style ruler for web rich-text editors: margin/indent drag handles, guides with snapping, table column markers. Froala · Summernote · Tiptap · CKEditor 5 adapters.
- ssrf-guard
· ssrf-guard-js
— SSRF defense for the JVM and JS/edge runtimes, including URL guards for LLM-agent tool calls.
- easy-paging-spring-boot-starter
— annotation-driven offset & keyset pagination for Spring Boot.
- api-log
— event-driven API logging into PostgreSQL JSONB.
- devslab-kit
— Spring Boot 4 platform starter: auth, RBAC + ABAC, multi-tenancy, dynamic menus, audit logging.
- datalinq
— convention-driven, cross-vendor JDBC data-migration TUI built on TamboUI.
- locale-match
— locale negotiation that won't hand a Simplified Chinese reader your Traditional text.
- numkey
· kokey
· vue-date-rail
— TypeScript input & UI libraries born from production forms.
Outside my own org, I contribute to TamboUI — the Java library for modern terminal user interfaces.
Java · Spring Boot · Spring Cloud · TypeScript · TanStack Start · SolidJS · Next.js · Vue · Node.js · Cloudflare Workers · PostgreSQL · Redis · AWS — plus LLM/RAG/agent integration, evals, and fine-tuning in everything we ship lately.
devslab.kr · open-source hub · LinkedIn · kangsin@devslab.kr