Custom Projects
The order went through. The last item sold to two people.
What matters is not the day a system works, but what it does under load. For each of the eight areas below we wrote the hard part, not the easy one — only someone who has built it knows where it breaks.
The flow shown is a representative order. Stock locks and 3D Secure are exactly the steps that never surface with one user and collapse with a hundred.
- Sepet
- Ödeme
- Stok
- Kargo
- Bildirim
- ›POST /api/siparis201 · 42 ms
- ›stok kilidi SKU-4471alındı
- ›3D Secure doğrulamabekleniyor
- ›3D Secure banka yanıtıonaylandı
- ›tahsilat ₺1.240,00başarılı
- ›stok düşümü SKU-4471kalan 12
- ›kargo etiketi oluşturulduMNG · 4471…
- ›webhook → WhatsAppgönderildi
- ›muhasebe e-arşiv faturakuyruğa alındı
- ›sipariş tamamlandı1,8 sn
The three asked for most
- 01
Online sales
kolay olan
Cart and product page
asıl iş
3D Secure flow, iyzico/PayTR integration, stock locking under concurrent orders, partial refunds, shipping labels and return codes
- 02
Booking system
kolay olan
Calendar and time slots
asıl iş
Conflict locking, per-staff capacity, time zones and DST, cancellation windows, reminder queue
- 03
Membership and panel
kolay olan
A login screen
asıl iş
Session refresh, role and permission matrix, GDPR deletion requests, two-factor authentication
The remaining five
Mobile app
App Store and Play review process, push notification permissions, deep links, forced updates
On-site chat
Shift handover, read receipts, WhatsApp Business API approval, out-of-hours auto-reply
Multilingual site
hreflang and canonical URLs, per-country stock and pricing, currency conversion, local payment methods
Reservations
Occupancy calendar, capacity and joinable tables, no-show policy, deposits
Custom software
Data model, integration with existing accounting/ERP, admin panel, audit log, backups
How would you know?
- 15 years
- in the field
- 15M+ USD
- ad budget managed
- 13+ countries
- e-export operations
- 57 sites
- built from one codebase
The page you are reading and the fifty-seven example sites under it come out of a system we wrote; a service with a passing test suite runs behind it.
Describing it is free. If it is not a fit we say so plainly — we do not dress up work that will not happen.
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