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)
Implement API Rate Limiting with Redis
Protect APIs from abuse with Redis-backed token bucket and sliding window limiters, including burst...
Implement SSO with SAML 2.0 (Python, Node.js, Java)
Implement SAML 2.0 single sign-on as a Service Provider: XML signature verification, IdP metadata,...
Serialize and Deserialize Data
How to serialize and deserialize data in JSON, XML, and YAML across Python, Java, and JavaScript.
Connect to PostgreSQL
How to connect to PostgreSQL databases in Python, JavaScript, and Java.
Deploy HTTP Cloud Functions on Google Cloud with Node.js
Create and deploy HTTP-triggered Cloud Functions on Google Cloud with Node.js, Express integration,...
Secure API Gateway with Custom Lambda Authorizers
Implement custom Lambda authorizers for API Gateway with JWT validation, IAM policy generation, and...
Design a DynamoDB Single-Table Schema for Serverless Apps
Design a DynamoDB single-table schema with composite keys, GSI patterns, and access patterns for...
Event-Driven Lambda with SQS Triggers and Batch Processing
Process SQS messages with Lambda using batch windows, partial batch responses, error handling, and...
Orchestrate Serverless Workflows with AWS Step Functions
Build state machine workflows with AWS Step Functions using sequential, parallel, and map states...
Publish-Subscribe Pattern
Broadcast events to multiple independent subscribers. Publishers send messages to a topic without...
GraphQL API Design Guidelines
Internal GraphQL API design guidelines template with schema structure, naming, mutations,...
Serverless Cold Start Runbook
Runbook for diagnosing and mitigating serverless cold starts: causes, measurement, optimization...
Serverless Function Deployment Checklist
Pre-deploy and post-deploy checklist for serverless functions (AWS Lambda, Azure Functions, GCP...
Database Schema Documentation Template
A template for documenting database schemas with entity relationships, field definitions, and...
Data Lake vs Data Warehouse — Architecture Guide
How data lakes store raw data at scale: medallion zones, lakehouse tables, ETL vs ELT,...
SQL Joins — Visual Guide with Examples
A visual guide to SQL joins: INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF joins with practical...
Logging, Monitoring & Observability Guide
A guide to building observable systems with structured logging, metrics, and distributed tracing.
Complete Guide to React 19 Features
A practical walkthrough of React 19: server components, the use() hook, actions, ref as a prop,...
Build Stateful AI Agents with LangGraph State Machines
Create multi-step AI agents with LangGraph using state machines, conditional edges, tool calling,...
Parse JSON in Python, JavaScript and Java
Parse JSON strings into native objects in Python, JavaScript and Java — with error handling,...
Environment Variables
How to read, set, and manage environment variables securely across Python, JavaScript, and Java.
Rate Limiting for API Security: Block Abuse and Brute Force
Use rate limiting as a security control against brute-force, credential stuffing, scraping, and L7...
Adapter Pattern
Convert the interface of a class into another interface clients expect. A structural design pattern...
CQRS Pattern
Separate read and write models to optimize each for its own workload — when CQRS pays off, when...