You will get Full-Stack Web Application Development (Frontend + Backend)
Project details
I'll build or extend your web application — from database to user
interface — delivering a complete, production-ready solution.
My full-stack background covers backend services in Java, Node.js, and
Perl, frontend development with Angular and Drupal, and database
architecture across MySQL, MongoDB, and Oracle. I've led development teams,
architected high-availability systems, and delivered enterprise-grade
applications for global clients.
Whether you're starting from scratch or adding features to an existing
app, I bring structure, clarity, and reliable execution to every project.
What makes this project different:
→ True full-stack ownership — I handle both frontend and backend
→ 10+ years of production experience across multiple industries
→ Clean code, proper documentation, and thorough testing
→ No surprises — clear milestones and daily updates
interface — delivering a complete, production-ready solution.
My full-stack background covers backend services in Java, Node.js, and
Perl, frontend development with Angular and Drupal, and database
architecture across MySQL, MongoDB, and Oracle. I've led development teams,
architected high-availability systems, and delivered enterprise-grade
applications for global clients.
Whether you're starting from scratch or adding features to an existing
app, I bring structure, clarity, and reliable execution to every project.
What makes this project different:
→ True full-stack ownership — I handle both frontend and backend
→ 10+ years of production experience across multiple industries
→ Clean code, proper documentation, and thorough testing
→ No surprises — clear milestones and daily updates
Programming Languages
PHP, JavaScript, JavaCoding Expertise
Cross Browser & Device Compatibility, Localization, Performance OptimizationWhat's included
| Service Tiers |
Starter
$299
|
Standard
$699
|
Advanced
$1,499
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 21 days |
Number of Revisions | 3 | 5 | 8 |
Number of Pages | 1 | 5 | 7 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | |||
Source Code |
About Omer Engin
Payment Systems Full-Stack Developer Perl Java Node.js
Izmir, Turkey - 5:54 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 study your brief, mockups, and existing code
Technical planning
I define the architecture and confirm the approach