Stefan Kojić

High-Performance WordPress Developer

Building WordPress sites that are fast, reliable, and built to scale. I solve the technical challenges that others avoid. Such as complex migrations, performance bottlenecks, server optimizations, and custom integrations that actually work under load.

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About Me

Performance-driven solutions for businesses that need more than just a pretty website

Technical Problem-Solving & Infrastructure Expertise

With 7+ years of experience and hundreds of successful projects, I specialize in the complex WordPress challenges that typical developers avoid. Your WordPress site should handle real traffic, integrate complex systems, and grow with your business, not break when you need it most.

I bring an infrastructure mindset to every project: beyond WordPress development, I understand hosting, DNS, CDNs, caching strategies, and deployment workflows. From database migrations and server failures to architecting solutions for high-traffic sites, I build the foundation your business needs to scale reliably.

Performance Optimization

Server Administration

Database Management

CI/CD & Git

API Integrations

WooCommerce

Services

Performance-driven WordPress solutions that scale with your business

Performance-Driven WordPress Sites

Fast page loads (sub-2 second targets), optimized databases, and clean code architecture. I audit your entire stack to eliminate bottlenecks and deliver sites that convert visitors.

Server configuration & optimization
Database query optimization
CDN setup & caching strategies
Front-end asset optimization

Custom Development & Complex Integrations

Custom themes (ACF/Gutenberg), complex plugins, and API integrations that won't break when your traffic grows. Built to handle 10x traffic without requiring a rebuild. I integrate CRM/ERP systems, AI-powered features, and third-party services configured for your specific workflows.

Custom themes from Figma designs
Advanced ACF & Gutenberg blocks
Custom plugin development
WordPress REST API integrations
CRM & ERP integrations
AI-powered features & automation
Third-party API connections
Complex database migrations

WooCommerce That Converts

Optimized checkout flows, custom product configurations, and payment gateway integrations. Focused on reducing friction at every step to maximize revenue per visitor.

Checkout flow optimization
Custom product configurations
Payment gateway integrations
Inventory & order management

Client Testimonials

What clients say about working with me

Adam

CEO 23am

Stefan is a very responsible developer with a fair adherence to schedule. He is thoughtful and not afraid to make decisions on his own. His frontend work is pixel perfect and he knows how to optimise content delivery. Very much recommended to work with."

Simon Strande

CEO Webnorth

Working with Stefan has been an exceptional experience from start to finish. He demonstrated a high level of expertise, professionalism, and dedication to the project. Not only did he understand the requirements thoroughly, but he also brought valuable insights and suggestions that elevated the final product beyond expectations.

Maria

Stefan is a professional who will help you to reach your goal, even if there're third-party problems. I will hire him again."

Karen Tutor

Astonishingly talented - really outstanding work for such a small contract. I am deeply impressed at the coding submitted. First Class! Thank you so much - we will be back!

Karen Tutor

Awesome work! Outstanding freelancer - delivers a truly fantastic product on budget and ahead of schedule. This freelancer is highly recommended and will do great work on whatever job provided. Thanks again! Talk soon -