Serhan Yildiz logo

Serhan Yildiz

Developer & Cyber Security

ENTR

Services

Build, secure or maintain.

Choose the service that matches your current need: build a new system, improve an old one, increase security or keep operations healthy.

Backend development illustration with application panels, code structure and workflow blocks

PHP / CodeIgniter 4

PHP and CodeIgniter 4 development for admin panels, business workflows and reliable web applications.

PHPCodeIgniter 4Backend
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YLZ-AI visual showing cyber security, API modules, CRM integration and reporting workflows

YLZ-AI

Autonomous AI system for cyber security, server operations and modular business automation.

YLZ-AIAutonomous AgentsThreat Detection
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Custom software illustration with dashboards, workflow cards and modular application blocks

Custom Software

Custom software for business processes that no longer fit spreadsheets or scattered tools.

Custom SoftwarePortalsWorkflow Automation
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Security review themed illustration with secure portal and monitoring panels

Cyber Security

Security reviews and hardening for websites, applications, login flows and server exposure.

OWASPThreat ModelingSecure SDLC
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E-commerce illustration with storefront, order management and product catalog views

E-commerce

Technical support and improvements for e-commerce systems that need to stay reliable and easy to manage.

E-commerceStorefrontOperations
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Platform engineering illustration with proxy layers, databases, mail services and operational dashboards

Server Maintenance

Server setup, maintenance and hardening for websites, applications, databases and mail services.

Server MaintenanceLinuxMySQLNginxApacheCaddyMail Server
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Engagement flow

Simple delivery flow.

Every project starts with a clear scope, moves into the most practical solution and ends with clean handover or ongoing support.

Audit and scope

Map risks, blockers and business goals before code starts moving.

Week 1 clarity

Build and harden

Ship the changes while keeping auth, performance and runtime quality in view.

Delivery with guardrails

Document and hand over

Leave the team with operational understanding instead of dependency.

Sustainable next steps

Best fit

Businesses that need PHP, CodeIgniter 4 or AI-based product work
Teams looking for custom software, e-commerce support or security improvements
Companies needing direct server, mail or deployment support