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)
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...
Build a RAG Pipeline with LangChain and Vector Databases
How to build a Retrieval-Augmented Generation (RAG) pipeline using LangChain and vector databases...
Implement API Logging and Audit Trails
Set up thorough request/response logging and audit trails for APIs with structured output,...
Implement a GraphQL API
Build a production-ready GraphQL API with type-safe schemas, resolvers, and query optimization in...
Build Real-Time Notifications with WebSockets
Implement a real-time notification system using WebSockets and Redis pub/sub for broadcasting...
Implement CDN Edge Caching
Configure content delivery networks with edge caching rules, cache invalidation, and geographic...
HMAC Request Signing for API Authentication (AWS Sig v4)
Secure API requests with HMAC signatures and AWS Signature v4 authentication for tamper-proof...