Kremi · iOS + Android
Mobile app
A Flutter shopping app for iOS and Android, live on the App Store and Google Play.
Websites, online stores and apps, built from plan to launch.
I'm a software developer who runs your project from start to finish: planning, development, launch and maintenance. E-commerce sites, iOS and Android apps, web apps and online products, and automations that connect your tools.
What I do
E-commerce websites
Online stores built to your brand, usually on Shopify, including moving an existing store over with its products and content.
Mobile apps
iPhone and Android apps, built once for both and published on the App Store and Google Play.
Web apps and SaaS
Online products people sign in to and pay for, built from the first screen to launch.
Automation and integrations
Marketplaces, shipping, stock and email connected, so orders are not copied between tabs and anything that fails raises an alert.
End-to-end project management
One person from the first plan to after launch: a written scope, regular written updates, and the same developer still there once it's live.
Experience
Full experience and log2025 – present
Software consultant
Kremi, cosmetics e-commerce
The Shopify storefront, the iOS and Android app, and the order systems behind them, worked on month by month.
2026 – present
Freelance engineer
Clients abroad, remote
Took over a live restaurant platform and moved its database to PostgreSQL while it stayed online, for a client who came back with more work.
2025 – present
Independent practice
Own products and client work
PromptLikeEngineer, LinkZae and FolderPls are live; an open-source CLI and MCP server are on npm; white-label sites run for clients.
2020 – 2024
B.Sc. Computer Engineering
Kocaeli University
Graduated in June 2024, with a part-time developer role at the university and two internships along the way.
Selected work
All workFor Kremi, a cosmetics brand, I build and look after the app and the systems behind the orders, and develop the online store. Then products I build and run myself.
Mobile app, 1 of 6
Software Consultant · Kremi
Kremi · Shopify
Website
The Kremi storefront on Shopify, built to the brand and serving customers in Turkish and English.
Kremi · Operations
Operations systems
The systems behind Kremi's orders: the online store and three marketplaces feeding one queue, shipping labels, returns, reviews and email, with failures raised as alerts. They are internal, so they are drawn, not shown.
Public beta
Folder
Organizes Google Drive files with tags laid over your existing folders, so nothing has to be moved.
Developed together with Erkut Yıldırım.
Live
Link
Digital business cards and link pages, each on its own subdomain, shared by link or QR code.
With thanks to the friend who started this with me and helped get the first version off the ground.
Live
Prompt
Version control for prompts: compare and roll back every change, from the terminal, the browser or inside your agent.
More of my own systems
More systems I build and run outside client work.
AI-OS
A 14-agent layer that runs my own projects: it tracks every repo, plans the work, and does maintenance overnight.
in progress
- 14 agents
- Desktop app
Loyalty platform
A multi-tenant points engine for small businesses, built on an append-only ledger so a balance can never drift from its history.
in progress
- Append-only ledger
- iOS + Android
Other client work, in depth
Inherited system modernization · Brand kept confidential
Finding the silent data loss in a platform I inherited
The panel said “commission updated”; row-level security had silently rejected the write. It was the most valuable find of a five-month live migration.
Read the case5months with the system live while the database was replaced
What that means in practice
Tenant isolation
A customer's data boundary holds even if the application code forgets to check. Permissions live in the database, so a query written wrong returns nothing rather than someone else's rows.
Durable work
A job that fails does not disappear. It retries, and if it keeps failing it lands in a dead-letter queue and tells a human it gave up, instead of leaving a gap nobody notices until a customer calls.
Ledgers that cannot drift
Balances are derived from an append-only history, not stored and updated in place. There is no path where the number on screen and the events behind it disagree.
Keys that stay on the server
The browser never holds a backend credential. Every call to a payment or marketplace API goes through a server-side route, so a leaked key is not one view-source away.
Releasing, not just building
Apps taken through store review and released on both the App Store and Google Play, including the parts nobody demos: forced updates, crash reporting, and what the app does with no network.
Inherited systems
Reading a codebase I did not write and finding the assumption buried in it, then migrating its database while the business keeps running on it.
White-label sites
Sites running on one white-label site platform I built: a shared database and a clonable template.
Selin Akız
Client · PR agency head, personal-brand consultant and speaker
Umut Metin
Client · editor and speaker on digital communication
Software Developer Archive
My own · research notebook on software and AI, moved from WordPress
How a project runs
Plan
You tell me the goal. Before any work starts, you get a written scope and an estimate.
Build
I build in small steps and send a written update at the end of each working block, so you always know where it stands.
Launch
The site or store goes live, and apps go through App Store and Google Play review to release.
Care
After launch I stay on for fixes, updates and whatever comes next, per project or month by month.
Have something to build, or something to fix?
A new website, store or app, or a project someone else started? Tell me what you have and I will tell you where I would start.