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 (1032)
Middleware
How to implement request/response middleware for logging, auth, and error handling across Python, JavaScript, and Java.
Pagination
How to implement cursor-based and offset-based pagination in APIs and databases across Python, JavaScript, and SQL.
Rate Limiting
How to implement API rate limiting using token bucket, sliding window, and fixed window algorithms across Python, JavaScript, and Java.
JWT Authentication
How to generate, validate, and refresh JSON Web Tokens for stateless API authentication.
Caching & Memoization
How to cache expensive computations and API responses using in-memory, LRU, and distributed caches across Python, JavaScript, and Java.
Date Formatting
How to parse, format, and manipulate dates across timezones using Python, JavaScript, and Java.
Regular Expressions
How to use regular expressions for pattern matching, validation, and text extraction across Python, JavaScript, and Java.
Sort an Array
How to sort arrays and lists in ascending, descending, and custom order across multiple languages.
URL Encoding
How to encode and decode URLs, query parameters, and path segments safely across Python, JavaScript, and Java.
UUID Generation
How to generate universally unique identifiers (UUIDs) for database keys, session tokens, and resource naming across Python, JavaScript,...
Database Transactions
How to use ACID transactions to ensure data integrity across Python, JavaScript, and Java with SQL examples.
SQL Joins
Practical examples of INNER, LEFT, RIGHT, and FULL OUTER JOINs with real-world query patterns.
Cron Jobs
How to schedule and manage recurring tasks using cron syntax across Linux, Python, and Node.js.
Docker Basics
How to containerize an application, write a Dockerfile, and run containers with Docker Compose.
Git Workflow
A practical branching strategy for teams: feature branches, pull requests, and clean commit history.
Unit Testing
How to write fast, deterministic unit tests with mocks and assertions in Python, JavaScript, and Java.
Abstract Factory Pattern
Create families of related objects without specifying concrete classes. A creational design pattern for consistent object families.
Adapter Pattern
Convert the interface of a class into another interface clients expect. A structural design pattern for interface compatibility.
Builder Pattern
Construct complex objects step by step. A creational design pattern for readable, configurable object construction.
Command Pattern
Encapsulate a request as an object, letting you parameterize clients with queues, logs, and undoable operations. A behavioral design...
Decorator Pattern
Add new functionality to objects dynamically by wrapping them. A structural design pattern for flexible behavior extension.
Factory Pattern
Create objects without specifying the exact class to instantiate. A creational design pattern for flexible object creation.
MVC Pattern
Separate application into Model, View, and Controller components. An architectural design pattern for organized, maintainable code.
Observer Pattern
Define a subscription mechanism to notify multiple objects about events. A behavioral design pattern for event-driven communication.