Portrait of Serhan Yildiz

About

Secure, practical delivery.

I work with businesses that need one reliable person for backend work, system security and practical technical delivery.

My goal is simple: build the right system, keep it understandable and make sure it stays reliable after launch.

Clear communication, direct ownership and practical security are basic parts of every project I take on.

Security-first architecture

I think about security from the start, so important fixes do not wait until after launch.

Business-aware engineering

A technical choice matters only if it helps the business move faster, safer or more clearly.

Freelance clarity

You work directly with the person doing the thinking and the building. That shortens loops and improves decisions.

Engagement model

Direct execution

Planning and implementation stay in the same hands.

No agency handoffs

Secure by default

Security is handled during the work, not left as a last-minute patch.

Risk addressed early

Operational awareness

Server, deployment and maintenance realities are considered from day one.

Fewer launch surprises

Preferred toolkit

PHPCodeIgniter 4AI / LLM systemsMySQLNext.js App RouterCustom software architectureE-commerce systemsDocker & CoolifyApache / Nginx / CaddyMail server operationsLinux operationsCyber security reviews

Capabilities

PHP / CodeIgniter 4

95%

Reliable backend development, business logic, admin panels and maintainable project structure.

AI systems

92%

AI assistants, automations and LLM-based tools that support real business work.

Cyber security

91%

Application security reviews, safer auth flows and practical hardening for real systems.

Server management

89%

Server setup, web services, mail systems, backups and day-to-day runtime support.