You will get Payment Gateway Integration for Your Web Application
Project details
I'll integrate a payment gateway into your web application — securely,
cleanly, and fully tested before delivery.
With 10+ years of experience in payment infrastructure, I've integrated
Klarna, Adyen, Checkout, Worldline, Ingenico, Altapay, QPay, and KNET for
enterprise clients including Estée Lauder's EMEA region — where my
integrations reduced transaction times by 20–30%.
Payment integrations are high-stakes work. I approach them with the
attention to detail they require: careful requirements review, thorough
sandbox testing, and clean implementation that's easy to maintain.
What makes this project different:
→ Real enterprise payment experience, not just tutorials
→ Familiarity with major global and regional gateways
→ Secure, well-documented implementation
→ Tested in sandbox before any live deployment
cleanly, and fully tested before delivery.
With 10+ years of experience in payment infrastructure, I've integrated
Klarna, Adyen, Checkout, Worldline, Ingenico, Altapay, QPay, and KNET for
enterprise clients including Estée Lauder's EMEA region — where my
integrations reduced transaction times by 20–30%.
Payment integrations are high-stakes work. I approach them with the
attention to detail they require: careful requirements review, thorough
sandbox testing, and clean implementation that's easy to maintain.
What makes this project different:
→ Real enterprise payment experience, not just tutorials
→ Familiarity with major global and regional gateways
→ Secure, well-documented implementation
→ Tested in sandbox before any live deployment
Programming Languages
PHP, JavaScript, JavaCoding Expertise
Cross Browser & Device Compatibility, Localization, Performance OptimizationWhat's included $599
These options are included with the project scope.
$599
- Delivery Time 21 days
- Number of Revisions 1
- Number of Pages 1
About Omer Engin
Payment Systems Full-Stack Developer Perl Java Node.js
Izmir, Turkey - 12:20 pm local time
optimizing payment infrastructure for global enterprise clients — including
Estée Lauder's EMEA region, where I reduced transaction times by 30% and
led payment integrations with Klarna, Adyen, Checkout, KNET, and QPay.
My background spans the full stack: backend-heavy work in Perl, Java, and
Node.js, frontend experience with Angular and Drupal, and database expertise
across MySQL, Oracle, and MongoDB. I've worked at every level — from writing
PL/SQL reports for 60+ hospitals to leading a development team in Turkey and
architecting high-availability systems with HAProxy and Percona MySQL
master-to-master clustering.
What I bring to your project:
→ Payment gateway integrations (Klarna, Adyen, CheckoutDotCom, Worldline,
Ingenico, Altapay, QPay, KNET)
→ Backend development in Perl, Java (Spring, JavaEE, Hibernate), Node.js
→ Frontend: Angular, Drupal, Ionic
→ Database: Percona MySQL, Oracle, MongoDB, Redis
→ Team leadership and technical architecture
→ AI-assisted development with Claude Code and Codex — fast ramp-up on
existing codebases
I work best on projects where reliability, performance, and clean
integration matter. I read requirements carefully before writing a single
line of code, test my own work, and communicate proactively.
Currently fully available.
Steps for completing your project
After purchasing the project, send requirements so Omer Engin can start the project.
Delivery time starts when Omer Engin receives requirements from you.
Omer Engin works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements review
I confirm gateway, stack, and integration scope
Sandbox setup
I configure and test the gateway in test environment