Now I'll ship yours.
Direct line to the engineer who writes the code.
No PM tax, no scope theater.
Based in Seoul. Building AI products at production scale, full-time.
What I build
Production-grade software for founders, ops teams, and product-led companies.
SaaS Builds
Subscription products with billing, multi-tenancy, admin panels, and CRM hooks. From validated idea to paying customers — shipped end-to-end.
AI Integrations
GPT, Claude, Whisper, and on-device models wired into existing workflows. Custom RAG, agents, document automation, voice — production-grade, with cost guardrails.
Mobile + Web Apps
iOS and Android from one codebase. Web dashboards that mobile mirrors. App Store and Play Store submission handled end-to-end.
Internal Tools
Custom admin panels, CRMs, ops dashboards built around your real workflow. Replace five SaaS subscriptions with one focused tool — and own the data.
Shipped & in production
Five products I designed, built, and run myself. Plus client work and industry samples.
Maeum Build
Premium business sites from one sentence.
Describe your business → AI generates 30+ pages. Live on your domain in 8–20 minutes. Edit by chat — "add 3 cakes to the menu".
Maeum Campfire
AI relationship coach.
Live on Google Play. Reads relationship context, replies in character. Real users, real retention.
GC OS
Construction · franchise AI ERP.
Site management, smart attendance, invoicing, tax automation, AI assistant. Credit-based billing.
NameGood (Intelligence)
Business-card to AI dossier in seconds.
AI Vision + OCR dual extraction. 25+ fields auto-detected. HEIC/HEIF support. iOS + Android.
MAEUM Learn
Multi-disciplinary learning — every question welcome.
Psychology, economics, philosophy, science — one question, every angle. No wrong questions. Curiosity becomes learning.
Job & Firm
Company stability score, stress index, toxicity grade.
AI deep-research streaming reports. Closing the info gap for job seekers.
Why hire me, not an agency
An engineer who runs a business
I've shipped, marketed, billed, and supported six products solo. I speak both code and business — your spec gets translated correctly the first time.
Operator's mindset, not a freelancer's
Every product I run has paying users, real traffic, and real outages I've had to fix at 2am. That's the same eye I bring to your build.
Async-first, KST timezone advantage
Direct line to the engineer. No PM, no scope theater, no slack channels with 12 strangers. Work continues overnight on US/EU schedules.
On-device + API AI experience
GPT, Claude, Whisper, RAG pipelines, plus on-device models (KoboldCpp, CLIP, FAISS). Production-grade integrations with cost guardrails.
How a project runs
Predictable cadence. Working software every week. No theater.
Discovery
Goals, scope, budget. Quick async exchange — no pitch decks.
Spec & prototype
Information architecture, user flows, tech stack, and a clickable prototype before we cut code.
Build & weekly demos
Working build shared via staging URL each cycle. Tight feedback loops, no surprises at the end.
Launch & handoff
Production deploy, domain, monitoring, runbook. Post-launch hypercare included. Optional retainer after.
Transparent pricing
USD, fixed scope, no surprises. Pay 50% to start, 50% on launch.
Starter
Landing site, marketing site, or single-purpose web tool.
Tight, focused engagement- Up to 8 pages or 1 small tool
- Custom design (no template)
- Responsive · SEO · analytics
- Production deploy on Vercel/Cloudflare
- Post-launch support included
MVP
Real product MVP — auth, billing, dashboard, the works.
Standard build- Auth, billing (Stripe), admin panel
- Multi-tenant architecture
- AI integration (1 model, RAG, or agent)
- iOS/Android via Capacitor (optional)
- Weekly demos · staging URL
- Post-launch hypercare included
Custom
Multi-month builds, complex AI systems, or staff-aug retainer.
Open-ended partnership- Discovery + spec workshop
- Architecture for scale
- Custom AI pipelines · on-device models
- Migration · integration · refactor work
- Monthly retainer or milestone billing
- Direct line, no account managers
Quotes in USD · Wire transfer, Wise, or Stripe · Mutual NDA on request · IP transfers on final payment
FAQ
Everything I get asked before signing. Missing one? Email me.
You do. IP transfers on final payment — you get the repo, infrastructure under your accounts, and a runbook. Nothing reused without written permission.
USD only. Stripe, Wise, or wire. Fixed scope: 50% to start, 50% on launch. Retainers invoiced monthly. NDA and MSA welcome.
Code lives in a repo you own from day one. Working builds ship to staging every cycle. Runbooks written as we go. If I'm out, another engineer can pick it up without losing momentum.
Yes — async-first by default. Email, Loom, Notion. Send context end-of-day, wake up to progress. The gap is a feature, not a bug.
Explore by service or industry
Dedicated landing pages for the most common engagements. Pick the closest fit and email me from there.
Services
Industries
Tell me what you're building.
I'll get back fast.
An idea, a Figma, or a half-finished repo — all fine starting points.
SaaS, AI integrations, mobile apps, internal tools — same engineer end-to-end.
Post-launch hypercare and long-term retainers available.
KST (UTC+9) · Async-first · Email-only intake