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)
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...
Minimize Cold Start Latency in Serverless Functions
How to reduce cold start times in AWS Lambda, Azure Functions, and Cloud Run using provisioned...
Design Effective Integration Tests for Reliable Systems
How to write integration tests that verify component interactions using test containers, API...
Build Autonomous AI Agents with Tool Use and Reasoning
How to design AI agents that autonomously plan, execute tools, and iterate toward goals using...
Implement Secure Session Management
How to create, validate, and expire user sessions securely across web applications using cookies,...
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,...
Environment Variables
How to read, set, and manage environment variables securely across Python, JavaScript, and Java.
GitHub Actions CI/CD
How to build and deploy with GitHub Actions using workflows, matrices, caching, and secrets.
Manage Application Secrets Securely
How to store, rotate, and inject API keys, database passwords, and certificates without hardcoding...
Read and Write Files
How to read from and write to files safely across multiple programming languages.
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...
Secure APIs with HTTP Security Headers
How to configure essential security headers like HSTS, CSP, and X-Frame-Options to protect APIs and...
Protect Web Forms Against CSRF Attacks
How to prevent Cross-Site Request Forgery attacks using synchronizer tokens, SameSite cookies, and...
Implement Rate Limiting for APIs and Web Applications
How to protect APIs and web endpoints from abuse using token bucket, sliding window, and fixed...
Prevent SQL Injection Attacks
How to write parameterized queries and use ORMs to eliminate SQL injection vulnerabilities across...
Prevent Cross-Site Scripting (XSS)
How to sanitize user input, escape output, and use Content Security Policy to prevent XSS attacks...
Build Event-Driven Serverless Architectures
How to design loosely coupled systems using serverless functions triggered by events from message...
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...
Build Serverless APIs with API Gateway
How to design, deploy, and manage serverless HTTP APIs using AWS API Gateway, Lambda, and...
Test API Contracts with Consumer-Driven Contracts
How to prevent breaking changes between microservices using consumer-driven contract testing with...
Write Integration Tests
How to test multiple components working together using real databases, HTTP clients, and message...