Mathias Paulenko
Software Engineer & Founder of StackPractices
Mathias Paulenko
Software Engineer
Software engineer with 12+ years of experience building production systems across Python, JavaScript, React, and DevOps. I have contributed to enterprise projects spanning CI/CD pipelines, API design, cloud infrastructure, and full-stack development.
StackPractices is my personal project, born from a simple belief: great documentation should be copy-paste ready. Every recipe, pattern, and guide on this site is designed to save you time and help you ship faster.
Published Works (1008)
Model Complex Business Domains with Domain-Driven Design
How to structure code around business concepts using bounded contexts, aggregates, entities, value...
Create Objects Flexibly with the Factory Pattern
How to use factory methods, abstract factories, and dependency injection containers to decouple...
Build Maintainable Applications with Hexagonal Architecture
How to structure applications using ports and adapters to isolate business logic from frameworks,...
Implement Reactive Systems with the Observer Pattern
How to build event-driven, reactive systems using the observer pattern with pub/sub, event...
Swap Algorithms at Runtime with the Strategy Pattern
How to encapsulate interchangeable algorithms and behaviors using the strategy pattern with...
Compress and Decompress Files with Gzip and Brotli
How to reduce file sizes for APIs, static assets, and log files using Gzip, Brotli, and zlib with...
Design Effective Integration Tests for Reliable Systems
How to write integration tests that verify component interactions using test containers, API...
Validate and Sanitize User Input Data
How to validate, sanitize, and constrain user input data at the application boundary using schemas,...
Manage Database Migrations Safely
How to version, apply, and rollback database schema changes using migration tools like Flyway,...
Manage Application Secrets Securely
How to store, rotate, and inject API keys, database passwords, and certificates without hardcoding...
Process Large Files with Streams
How to read, transform, and write large files efficiently using streams without loading entire...
Implement Lazy Loading for Images, Components, and Data
How to defer loading of non-critical resources until they are needed, improving initial page load...
Protect Web Forms Against CSRF Attacks
How to prevent Cross-Site Request Forgery attacks using synchronizer tokens, SameSite cookies, and...
Prevent Cross-Site Scripting (XSS)
How to sanitize user input, escape output, and use Content Security Policy to prevent XSS attacks...
Build Real-Time APIs with WebSockets on Serverless
How to implement bidirectional real-time communication using WebSockets with AWS API Gateway,...
Run Scheduled Jobs with Serverless Functions
How to replace cron jobs with serverless scheduled functions for backups, reporting, cleanup, and...
Composite Pattern
Compose objects into tree structures to represent part-whole hierarchies. A structural design...
Interpreter Pattern
Define a representation for a language's grammar along with an interpreter that uses the...
Iterator Pattern
Provide a way to access elements of a collection sequentially without exposing its underlying...
Mediator Pattern
Define an object that encapsulates how a set of objects interact. A behavioral design pattern for...
Memento Pattern
Capture and restore an object's internal state without violating encapsulation. A behavioral design...
Proxy Pattern
Provide a surrogate or placeholder for another object to control access to it. A structural design...
Retry Pattern
Retry an operation that has failed with transient errors, using configurable strategies like fixed...
Database Migration Runbook Template
A database migration runbook template for executing schema changes safely with rollback procedures,...