You will get Backend API Development & Integration for Your Web Application
Project details
I'll design and build reliable, well-documented backend systems and REST
APIs tailored to your business needs.
With 10+ years of backend experience across Java, Node.js, Perl, and PHP,
I've built production systems for enterprise clients — including payment
infrastructure for Estée Lauder's EMEA region and high-availability
platforms serving thousands of users daily.
I work methodically: I read your requirements carefully before writing a
single line of code, test everything before delivery, and communicate
clearly throughout the process.
What makes this project different:
→ Enterprise-level experience brought to your project
→ Clean, maintainable, and documented code
→ Database expertise across MySQL, MongoDB, Oracle, and Redis
→ Fast ramp-up on existing codebases using AI-assisted development
→ Proactive communication — no radio silence
APIs tailored to your business needs.
With 10+ years of backend experience across Java, Node.js, Perl, and PHP,
I've built production systems for enterprise clients — including payment
infrastructure for Estée Lauder's EMEA region and high-availability
platforms serving thousands of users daily.
I work methodically: I read your requirements carefully before writing a
single line of code, test everything before delivery, and communicate
clearly throughout the process.
What makes this project different:
→ Enterprise-level experience brought to your project
→ Clean, maintainable, and documented code
→ Database expertise across MySQL, MongoDB, Oracle, and Redis
→ Fast ramp-up on existing codebases using AI-assisted development
→ Proactive communication — no radio silence
Programming Languages
PHP, Java, PerlCoding Expertise
Localization, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$199
|
Standard
$499
|
Advanced
$999
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 8 days |
Number of Revisions | 2 | 5 | 8 |
Number of Pages | 5 | 10 | 11 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | |||
Source Code |
About Omer Engin
Payment Systems Full-Stack Developer Perl Java Node.js
Izmir, Turkey - 4:14 am 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 analyze your brief and ask clarifying questions
Architecture planning
I outline the approach and get your approval