Codexworker

Backend Migration Without Rebuilding Everything

Moving off an old stack or a monolith without betting on a big rewrite. I migrate piece by piece — one service, one component — keeping the business running while the new stack takes over.

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

Migrate backend components incrementally.

Typical Problems

monolith to services language/platform moves database migration keeping the business running data compatibility rollback safety

Relevant Experience

Migrated backend components including PHP-to-Go for data processing and Elasticsearch version upgrades. Each step done with the old and new running in parallel, validated, then cut over.

What Is Included

migration strategy
component selection
data compatibility checks
gradual cutover plan
rollback plan

How It Works

We pick the lowest-risk component to move first, build the new version alongside, and cut over. From €1,500 for an initial migration.

Starting from €1,500

Initial migration of one component.

Frequently Asked Questions

How do you de-risk a migration?

Move one component at a time with the old and new running in parallel, validate data and behaviour, then cut over. Each step is reversible.

Related Services

Other problems I help with.

Modernize Your Legacy PHP Application

Gradually modernize a legacy PHP application.

Details →

PHP to Go Migration

Migrate selected PHP components to Go.

Details →

Elasticsearch Migration & Upgrade

Migrate to or upgrade Elasticsearch with minimal downtime.

Details →

Backend Performance Audit

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

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
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 a backend migration