Jan Mikoláš
How to install Docker
A simple installation for Windows, macOS, and Linux. At the end, you will check that Docker is really running.
Practical
Guides without the fluff.
Short procedures you can try right away. More guides will be added over time.
How to design a REST API in Symfony
From endpoint addresses through validation to clear JSON responses.
How to connect an online store to an external API
Safe authentication, reliable calls, and what to do when the other side does not respond.
How to automate product imports into an online store
How to turn a feed into a repeatable process that does not confuse prices or stock.
How to process webhooks correctly
Verification, a quick response, and safe processing without duplicates.
How to speed up a slow PHP/Symfony application
Find the real bottleneck before adding cache without a clear reason.
How to use Redis cache in a PHP application
What belongs in cache, how long data should stay there, and when to remove it safely.
How to process background jobs with RabbitMQ
Keep slow work out of web requests and make sure messages are not lost.
How to design an order state system
States, allowed transitions, and clear rules that keep an order under control.
How to prevent duplicate payment or order processing
A practical combination of idempotency, transactions, and safe webhook processing.
How to create a Docker environment for PHP, nginx, and PostgreSQL
A clear three-service baseline for a local PHP project.
How to start a new Symfony project for a real production application
From a clean project to an environment that will not surprise you at the first deployment.
How to use Dependency Injection correctly in Symfony
Pass dependencies clearly, test easily, and keep the container from taking over your design.
How to design the architecture of a larger PHP application
Split responsibilities so the code stays safe to change a year from now.
How to split a monolithic application into modules
A gradual split without a large rewrite or unnecessary coupling between parts.
How to design an internal company system
Start with people and their work. Only then draw screens and integrations.
How to identify what to automate first in a company
Choose a process that saves the most time and can still be verified safely.
How to connect two systems through an API
Agree the data, access, and errors before writing the actual request.
How to synchronize data between two systems
Set a source of truth, capture changes, and expect one system to be unavailable sometimes.
How to handle an external API outage
Do not let another service’s outage block your whole application or overwhelm the other side.
How to implement retry and exponential backoff
Retry only sensible failures, with a delay and a clear limit on attempts.