Available for new projects · Seoul (KST)

I ship AI products past the demo stage.

Freelance developer for Replicate and fal.ai builds, production refactors, and MVPs that actually launch.

Selected work

Two live products, shipped end to end.

Live in production

AI still-image ad creative studio. Product photos in, scroll-stopping ad stills out, tuned for paid social.

Live in production

AI short-form video generation service. Prompt to finished short, with the render pipeline and delivery handled end to end.

The work between a working demo and a product that earns.

Your vibe-coded app works until it doesn't. I review AI-generated code, fix what's broken, and refactor it into a codebase you can maintain.

Starting at $500

Code review · Refactoring · Bug fixes

Video and image generation with Replicate and fal.ai. Queues, webhooks, caching, and cost control, wired correctly from day one.

Starting at $1,500

Replicate · fal.ai · Webhooks

Auth, billing, and subscriptions. The unglamorous work AI tools fumble, done carefully so you actually get paid.

Starting at $1,000

Auth · Billing · Edge cases

From idea to launched product. I scope it in writing first, then you get a fixed quote. No hourly fog.

Fixed quote after written brief

I'm Jaeho Lee, a freelance developer in Seoul. I spent two years as a developer at AutoCrypt, then went independent to build AI products full time.

My work sits between AI demos and production reality: media pipelines, billing, and code that survives contact with real users.

NowIndependent freelance developerAI products, media pipelines, and MVPs. Operating ShortReal AI.
2021 to 2023Developer, AutoCryptAndroid and web development · automotive cybersecurity.
2018 to 2025B.S. Computer Engineering, Gachon University

Short process, fixed price, no surprises.

01Written brief
- What you're making, plus whatever shows it
- Ack within 12 hours, questions welcome anytime
- Fixed quote within two business days, no calls needed
02Fixed quote
- Scope, timeline, and one locked price in writing
- Half upfront via Wise, half on handoff
- Two revision rounds, batched in writing. New scope quoted separately
- If the fit is wrong, decline in writing
03Build and handoff
- Demos on longer builds, from a clean repo
- Docs included for handoff
- 30 days of free fixes for delivered work after handoff
- You own all of it at handoff

Send a brief: what you're making, plus whatever shows it. Links, screenshots, a Notion page, plain words. All welcome.