Mr. Latte

A Freelance Software Development Expert Who Plans and Ships Products

• Since 2002Building products
• Since 2005Writing tech
• Since 2008Running this site
• 16Own products shipped
• 80+Client projects
• 4Patents · Papers

Now

Still shipping and iterating. I run 16 services in parallel and keep refining each one’s user flow and operations.

• Services in operation: See all 16
• Recent activity: Blog · Research
• Work with me: Work With Me · Contact

I’m a Seoul-based freelance software development expert who works across planning, development, and launch. Founders, teams, and businesses can hire me for product work. I do more than implement features: I define the problem, narrow the MVP, design the user flow, and take the product through build and launch.

Since 2002, I have worked across web, mobile, and cloud products for startups, established companies, and my own self-initiated services. I also keep up closely with new technology shifts and have practical experience applying AI to product features, automation, and development workflows. I am intentionally repositioning my work around a clearer identity: a freelance software development expert who can also frame the problem, define the MVP, and carry the product into launch.

What I Do

• Problem framing and MVP scoping - Turn early ideas into a concrete product boundary and a realistic first release.
• User flow and information architecture - Clarify where users enter, decide, convert, and return.
• Full-stack implementation and launch - Build across frontend, backend, infrastructure, and operations.
• Technology trend and AI application review - Evaluate where new technology or AI actually creates product value instead of noise.
• Product and engineering reviews - Identify bottlenecks in structure, execution, and technical decision-making.

See the offer structure on Work With Me or start a conversation on Contact.

Built Products

Products I planned and shipped myself. Most of them I still run today.

• InverseOne - Surfaces the stocks that look poised to rise each day across KR/US markets. An expectation score, blending upside room (recovery to the 52-week high), oversold position, value, and money direction, ranks the candidates, and each stock shows why it made the list. The underlying sector/stock money flow rides along as the evidence; deep multi-day flow trends unlock with a credit. Estimated indicators, not investment advice.
• Reputo - A multilingual career exploration site that converts vague job names into real-person growth paths, ordered preparation steps, and honest reality. Content production runs on an AI pipeline.
• StartupXO - One search bar to explore ideas, news, and talent simultaneously. AI generates fresh ideas daily, RSS-sourced news is auto-translated into ko/en/ja and deployed, and a Telegram-connected talent deck is available alongside.
• Typdit - A web rich text editor built on a from-scratch core instead of an existing editor library. Markdown shortcuts, slash commands, clean paste from Notion and Word, autosave and document templates, plus the same editor droppable into any site with a single script tag.
• DeepThought - Open in the browser, structure thinking in seconds, publish the result as a link, and let other people fork it into their own draft. Zero install, free, with browser-side AI assistance.
• BootSignal - A drop-in tool workshop that endlessly adds the small tools any website needs. Free visitor tools (QR generator, D-day calculator, lorem ipsum) and paid embed widgets (countdown, announcement bar, share buttons, comments, ratings, feedback), all in one line. Embed widgets use per-site credit subscriptions from your shared mrlatte wallet.
• Out of Stealth - A discovery directory for new products and services. On top of approval-based submission, a concept showcase, and a community board, a YC-style company directory introduces the companies behind products and their flagship work. In ko/en/ja/zh-cn.
• DoYouBox - Psychological tests, personality quizzes and balance games built for teens and twenty-somethings, designed to be shared on messengers and social and spread virally. A soy-milk-flavored test curation service benchmarked on Poomang, in Korean, English, Japanese and Chinese.

View all services

Support

• GitHub Sponsors
• Buy me a coffee

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