Opcode · est. 2004
Over 20 years of building production systems. I take over and modernize the applications your business relies on. I start with an audit and plan changes in stages.
How do we start? Describe the problem. We agree the scope and price of the first step before work begins.
I build web applications and develop the systems businesses rely on every day.
PHP/Symfony systems designed to accommodate new features without rebuilding the entire application
Repeatable deployments and monitoring that make systems easier to maintain
Connections to accounting, inventory and partner systems that reduce manual data transfer
Investigation of slow queries and delays before investing in a more powerful server
Gradual modernization with a plan for data migration and deployments
Testing, improving AI-assisted code and preparing the application for real users
Two examples of improving systems while customers continued to use them.
Legacy PHP and paying subscribers. A compatibility layer enabled the move to PHP 8.4 without changing 46 files that used the old database functions.
PHP 8.4 without rewriting the application
Read the case study: Modernising a US subscription platformA Norwegian portal reported success when data fetches had failed. I changed error handling and reduced API calls so failed updates could be retried.
About 45 → 17 API calls per update
Read the case study: Repairing a property portal’s data syncMake your AI-generated MVP production-ready
Code written with AI needs the same care as any other code: tests, security, thoughtful architecture and a deployment process. I help prepare it for real users and further development.
I review the code, architecture, security, performance and tests.
I prioritise changes: what is urgent, what can wait and how much work each needs.
I improve the prototype’s code and architecture to make maintenance and development easier.
I prepare the deployment process, monitoring and infrastructure needed to launch the product.
Jacek Różański
Senior PHP Developer · Software Architect · DevOps Engineer
A developer with 20+ years of experience building production systems. I run Opcode from the Katowice area, Poland - delivering both hands-on development and technical consulting.
I design application architecture, integrations and AWS infrastructure. I help reduce maintenance costs and prepare systems for further development.
I've built systems for companies in Poland, Norway, the UK and the US. Today, I mainly work with businesses that need to maintain and develop the systems they already rely on.
Applications for the Scandinavian real estate market
Symfony · React · PostgreSQL · REST/SOAP
Learning platform for businesses and public-sector organisations in the UK
Symfony · Vue · AWS · DDD/CQRS
System modernization for a leading Polish telecom operator
Symfony · React · PHP · PostgreSQL · MySQL
Sales platforms with payment integrations and data processing
PHP · Stripe · APIs
Startup: e-commerce and marketing for car owners and repair shops
Zend · jQuery · APIs
EU grant management systems, CMS platforms, internal applications
PHP · MySQL · Linux
Describe your system and the problem. I'll explain what I can assess initially and what information is needed to define the scope and estimate the cost.
Silesia: Katowice, Mysłowice Lesser Poland: Kraków
ul. Imielińska 79 41-407 Imielin
PL6462602251