Codexworker

PHP Developer for Existing Projects

You have an existing PHP codebase — Symfony or custom — and need someone who can pick it up quickly, fix bugs, extend features and keep it stable without a rewrite. I specialize in working with existing systems.

I'm a backend developer with 10+ years of experience across PHP, Go, MySQL and Elasticsearch. Recent work includes Cenoskop (30M+ products daily), Niftycent (US price intelligence), and facha.sk (Go backend). I build, fix and optimize backend systems that handle real data and real traffic.

What I Can Help With

Work on an existing PHP project — extensions, fixes and maintenance.

Typical Problems

bug fixes feature extensions refactoring fragile code framework upgrades dependency updates maintenance debt

Relevant Experience

Regularly pick up existing PHP codebases — most recently helped extend a Symfony application processing traffic analytics data. Comfortable reading unfamiliar code, reproducing bugs, and making changes without breaking existing behavior.

What Is Included

codebase onboarding
bug diagnosis and fix
feature implementation
refactoring
tests and reviews

How It Works

I read your code and tests, reproduce the issue, and fix it with minimal risk. Hourly rate €60. I can work short sessions or embedded in your team.

From €60/h

Hourly, with a quick diagnosis up front for bug fixes.

Frequently Asked Questions

How quickly can you start on an existing codebase?

Usually within a day. I start by reproducing the problem and reading the relevant code/tests before touching anything.

Related Services

Other problems I help with.

PHP Backend Development

Build or extend backend features, APIs and services in PHP.

Details →

Modernize Your Legacy PHP Application

Gradually modernize a legacy PHP application.

Details →

Backend Performance Audit

Find and prioritize the real bottlenecks across your full backend stack.

Details →

Technical Debt Audit for Backend Systems

Assess technical debt in an existing backend.

Details →

Systems I've Built

Relevant production work.

Job & Services Marketplace

facha.sk

Find a job or offer your services.

Built the Go backend — API, matching logic and deployment.

Job Marketplace Services Go
Secure Communication

Paidshield

Chat application with end-to-end encryption.

Built the backend and encryption layer for a secure chat application.

End-to-End Encryption Real-time Communication Security
Security Scanner

remotedaemon.com

Remote security scanner with ping and certificate checking.

Built the scanning daemon and monitoring backend.

Security Ping Certificate
DNS Security

Synopsee

A Cleaner, Safer Internet. Take control of your DNS. Block ads, trackers, and malicious sites with customizable profiles.

Built the DNS resolution backend and profile management system.

DNS Security Privacy
Price Intelligence Engine

Cenoskop / Levnobot

Crawler monitoring millions of products. Processing 30M products daily and comparing them.

Built and maintain the full crawling pipeline — from scraping through Elasticsearch indexing to price comparison.

Data Aggregation Scraping ElasticSearch
US Price Intelligence

Niftycent

Price intelligence engine for the US market. Processing large-scale product data.

Built the data pipeline and crawling infrastructure for large-scale US product monitoring.

Data Aggregation Scraping Big Data
Traffic Analysis

AnalyticsForWebsite

Custom solution for collecting and evaluating traffic metrics with emphasis on processing speed and minimizing backend load.

Designed and built the backend for fast traffic metric collection and evaluation.

Performance Optimization Data Collection

Need Help With This?

Describe the problem in a few lines — I'll look at it and tell you what I think.

Discuss your PHP project