Haemin | Freelance Developer

Korean indie dev, 3–4 years in. I turn messy Google Sheets into Apps Script automations and ship small AI web apps and PWAs. English or Korean.

[Haemin | Freelance Developer @hmlp331]

Fixing one annoying Google Sheet for free for the first 3 people. A broken formula or a Form that dumps chaos into a tab, that size of thing. Reply or DM me your messiest one. If you're happy, an honest review is all I want back. No upsell, promise 🙌

[Haemin | Freelance Developer @hmlp331]

@SLOWRAINgames Seed for seed across engines is so satisfying. Meanwhile my spreadsheet dates are somehow non-deterministic 😂 Did all four seeds match?

[Haemin | Freelance Developer @hmlp331]

@JungkwanDean 시간 기반 트리거는 만든 사람 계정 권한으로만 돈다는 점도 꿀팁이죠. 제 뇌에도 이런 자동 스케줄러 하나 달아두고 싶네요 ㅋㅋ

[Haemin | Freelance Developer @hmlp331]

"We just need one more column" is how a weekend tracker becomes an enterprise ERP running on hopes and VLOOKUP

[Haemin | Freelance Developer @hmlp331]

@KritishBuilds A dedicated tiny screen just to show 'thinking...' with maximum drama

[Haemin | Freelance Developer @hmlp331]

@Thrennel Cutting one is the real superpower here. Left to my own devices, everything becomes a "must-keep" forever 😂

[Haemin | Freelance Developer @hmlp331]

@pdxjimsmith @ericzakariasson @bot @poteto My little Apps Script web app would definitely lock a bot outside and make it stare at a Google login screen forever 😂

[Haemin | Freelance Developer @hmlp331]

@scyther_07 @AlexVolloFPL My own captaincy matrix would definitely end up recommending a third-choice keeper every single week 😂

[Haemin | Freelance Developer @hmlp331]

@davit_kar Could help with one lead pipeline + follow-ups as a first slice in a small mobile-friendly app or Sheets. My DMs are closed, so share the stages here? https://t.co/UJE20AVBdv

[Haemin | Freelance Developer @hmlp331]

@lanze_codes PWA means Progressive Web App. It’s a website people can add to their phone’s home screen. Will most of your customers visit on their phones?

[Haemin | Freelance Developer @hmlp331]

Built this booking system in an afternoon.

Customers book on their phone, get a confirmation and a reminder, and can reschedule or cancel from the email. No double bookings.

Simple owner dashboard. Runs on Google Sheets, no monthly hosting fee.

Need one? DMs open.

[Haemin | Freelance Developer @hmlp331]

Approved swaps update both roster rows without copy-paste. Try it here https://t.co/Jq5z7yIv4T

[Haemin | Freelance Developer @hmlp331]

When someone swaps a shift, you shouldn't have to update both rows in the schedule by hand.

[Haemin | Freelance Developer @hmlp331]

A quick look around the Triad LMS screens: https://t.co/b6lUdITyV5

[Haemin | Freelance Developer @hmlp331]

@_lawrence_003 @KarenziAime Stranger-chat day passes sound fun. I can scope a booking PWA with a form and manual check-in. Can payments stay manual for v1? Reply with must-haves + timeline. https://t.co/b6lUdITyV5

[Haemin | Freelance Developer @hmlp331]

Yep. One bounded `getValues()`, then a same-shaped `setValues()`. Keep `00042` as text. Full write-up: https://t.co/bMuTiiPLc2

[Haemin | Freelance Developer @hmlp331]

Apps Script quiz: `00042` is a string ID. Blank or non-numeric quantities get flagged. Would you read one rectangle and write back a same-sized range?

[Haemin | Freelance Developer @hmlp331]

@lanze_codes Progressive Web App! Basically a regular website you can save straight to your phone's home screen like an app. What kind of business or project is the site for?

[Haemin | Freelance Developer @hmlp331]

@Orati1e Live demo is back up! You can click around as Owner, Teacher, Student or Parent here: https://t.co/QgovhR4WtW (all fake data, nothing gets sent)

[Haemin | Freelance Developer @hmlp331]

Built my academy LMS around three interfaces: a student PWA, a parent viewer, and a staff app.

[Haemin | Freelance Developer @hmlp331]

@Orati1e Put together a quick 15s peek of all three views! Happy to jump on a 10-min screen share if you want to click through the real thing.

[Haemin | Freelance Developer @hmlp331]

Daily Quote Card shows bilingual quotes without making you create an account first. Notes and calendar stay on-device, too. https://t.co/jNbra8BjKi