Small businesses · brands · education
A real online storefront, even for a small business
If marketplace fees hurt and bookings live in spreadsheets and chat apps.
What I build Brand sites, your own store, bookings & enrolment, accounts & payments
Software studio
Software shaped to how your business flows.
Online stores and booking sites, field operations systems, iOS apps and AI automation. At GoodFlow one person owns planning, design, engineering and operations — so what gets built matches how your business actually runs.
Free consultation · reply within one business day
Services
Whatever the business, I start with the flow
What matters more than the industry is how the work moves. Most problems fall into one of these three.
SMEs · field operations
Scattered field work on one screen
If paper, Excel and text messages are being forced into an off-the-shelf ERP.
What I build Custom business systems, mobile field input, settlement & ledgers, SMS automation, subscription SaaS
Institutions · non-profits · teams
Hand the repetitive work to AI
If people write the same report, summary and digest every single week.
What I build AI document summaries & tagging, automated newsletters, meeting minutes, dashboards & maps
Work
Built, shipped, and running
Organised by the business problem, not the screens.
SunapRok
LiveIn-house SaaS for waste-processing sites
A subscription cloud service that handles weighing, invoice texts, payments and ledgers for waste-processing sites on one screen.
- 2 AIplate recognition · load suggestion
- 46operations screens
- 14 daysfree trial, then subscription
- React
- Supabase
- Edge Functions
- PortOne
- CoolSMS
- Google Vision
- Gemini
HH Korean
Launching soonOnline Korean language school
A three-language platform where learners around the world enrol in and attend live Korean classes.
- 3 languagesKorean · English · Chinese
- 3 portalsstudent · teacher · admin
- 33screens
- Next.js
- Supabase
- PortOne
- Zoom API
- next-intl
- Vercel
DUCKS: Dan and Dave
Launching soonIndependent comic creators
A brand platform that runs the comic’s story site, online store and convention sales as one system.
- 33screens (15 public · 18 admin)
- Stripepayments + automatic tax
- Booth modeswitch to convention sales
- Next.js
- Supabase
- Stripe
- Resend
- MapLibre
- Netlify
zerocal
Coming soonGoodFlow’s own iOS app
An iPhone calendar where one typed or spoken sentence becomes an event.
- 1 sentence→ 1 event
- 2 languagesdetected automatically
- 0data sent to a server
- iOS 17+
- WidgetKit
- EventKit
- On-device NLP
More work
For institutions and teams
AI workflow automation
A weekly newsletter that gathers sector news, lets AI filter and group it by theme and emails it out; a tool that turns meeting recordings into minutes linked to the calendar; and a tool that turns slides plus your own voice into a narrated video.
Data dashboards · maps
An interactive dashboard that reads annual-report spreadsheets from programmes in several countries and compares them at a glance, plus print and web maps that show regional priorities.
Client names and detailed figures are withheld at the client’s request.
Capabilities
Combined as much as you need
- Responsive websites
- Your own online store
- Stripe · PortOne payments
- Subscription billing
- Bookings & enrolment
- Accounts & roles
- Admin CMS
- Multiple languages
- iOS apps
- Installable web apps (PWA)
- AI summaries & tagging
- Photo & document OCR
- Data dashboards
- Excel import & export
- Automated SMS & email
- Maps & location
- Zoom integration
- SEO
Process
How a project runs
One person owns it end to end, from planning to operations. Nothing gets lost in translation.
-
Conversation
I start by learning how your business runs today — and sometimes I will suggest not building something at all.
-
Scope & quote
Screen flows and scope go into a written document with a fixed quote and timeline. The contract is based on it.
-
Build
Every week you get screens you can actually use. If the direction needs to change, we talk about it right then.
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Launch & care
Domain, search registration and a walkthrough are done before launch. After that, maintenance keeps us working together.
- One person from planning to code — no middlemen
- You own the source code and the domain
- No extra costs after the quote without your agreement
Pricing
Starting prices, in the open
These are starting points. Once the scope is set you get a fixed quote, and nothing is added after that without your agreement.
-
Brand website
from ₩1.5M
About 5 pages · responsive · SEO basics · contact form
from 2 weeks
-
Store & booking site
from ₩4.5M
Online payments · product & order admin · email notifications
from 4 weeks
-
Business system · SaaS
from ₩9M
Login & roles · data management · reports & Excel · SMS
from 6 weeks
-
App MVP
from ₩8M
iOS or installable web app · 1–2 core features · App Store launch support
from 6 weeks
-
AI automation
from ₩2M
Document summaries & tagging · OCR · automated reports
from 2 weeks
-
Maintenance
from ₩150K/mo
Hosting care · small changes · incident response
monthly
Excl. VAT · Multiple languages, admin extensions and AI features are available as add-ons.
Quote
Quoted to fit your scope
Two online stores can cost very different amounts depending on what they need. After a conversation I scope it and send a fixed quote — free of charge.
What shapes the quote
- Number of pages and screens
- Payments and accounts
- How much admin you need
- Multiple languages
- Integrations (SMS · Zoom · AI and more)
- Timeline
FAQ
Questions
How long does it take?
Roughly from 2 weeks for a brand site, 4 weeks for a store or booking site and 6 weeks for a business system. You get an exact timeline once the scope is set.
Do I need a detailed plan first?
No. Most projects start from a single sentence. We shape it together during the conversation and scoping.
What about changes after launch?
Bugs found in the first month after launch are fixed free of charge. After that, work continues under a monthly maintenance plan or per request.
Who owns the code and domain?
You do. After final payment the repository, domain and hosting accounts are transferred to you.
Are there hosting costs?
Most projects start on the free tiers of Netlify, Vercel or Supabase. As usage grows there may be modest monthly costs, and you will know in advance.
Can you invoice a company?
Yes. GoodFlow is a registered Korean business and issues official tax invoices. Payment is split into a deposit and a final payment.
Contact
What would you like to build?
Write as much or as little as you like. You will hear back within one business day.
Prefer email? support@goodflow.dev