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)
Builder Pattern: Step-by-Step Object Construction
Construct complex objects step by step. A creational design pattern for readable, configurable...
Business Delegate Pattern
Reduce coupling between presentation and business tiers by introducing an intermediary that handles...
Cache Stampede Prevention Pattern
Prevent thundering herd cache misses with locks, single-flight, stale-while-revalidate and early...
Mediator Pattern for Decoupled UI Components
Reduce chaotic dependencies between UI components by introducing a mediator that centralizes...
Singleton Pattern: Java, Python & TypeScript Examples
Ensure a class has only one instance and provide global access to it — the creational design...
Cache Eviction Policy Template
Template for documenting cache eviction rules per cache layer: LRU, LFU, TTL, FIFO, random...
Cache Strategy Decision Template
Fill-in template for choosing and documenting a cache strategy per service: decision matrix, TTL...
Bug Triage Template
A template for classifying and routing bug reports by severity and impact.
Blob Storage: S3, GCS, and Azure Blob Patterns for Engineers
A practical guide to cloud blob storage: bucket design, access control, lifecycle policies,...
Blue-Green Deployment Guide
A practical guide to blue-green deployments: architecture decisions, traffic-switch mechanisms,...
API Versioning: URL, Header & Media Type Strategies
How to version REST APIs with URL path, header, and media-type strategies while keeping backward...
Secure API Key Authentication for Services and Clients
How to generate, distribute, validate, and rotate API keys for machine-to-machine authentication...
Thread-Safe Collections: Blocking Queues and Concurrent Maps
How to safely share collections between threads using concurrent data structures—blocking queues,...
Deploy Containers to AWS ECS with Fargate
How to deploy Docker containers to AWS ECS using Fargate serverless compute with Terraform and...
Reduce AWS Lambda Cold Start with Provisioned Concurrency
Minimize Lambda cold start latency using provisioned concurrency, ARM64 Graviton, lighter...
Package Python Dependencies for AWS Lambda with Layers
Package Python dependencies for AWS Lambda using Lambda Layers, Docker builds for native...
HTTP-Triggered Azure Functions in Python
Create HTTP-triggered Azure Functions in Python with binding configuration, async handlers,...
Test API Contracts with Consumer-Driven Contracts
How to prevent breaking changes between microservices using consumer-driven contract testing with...
API Mocking for Testing
Build reliable tests by mocking external APIs with WireMock, MockServer, and MSW to eliminate...
Back-Pressure Pattern
Stop fast producers from overwhelming slow consumers by pushing flow-control signals back through...
Backend for Frontend (BFF) Pattern
Give each client type its own backend that aggregates downstream services and shapes data to that...
Contract Testing: Verify Consumer-Producer API Contracts
How to use contract testing to verify that API producers and consumers agree on request and...
API Error Handling Guideline
A guideline for standardizing error responses, status codes, and error payloads across REST and...
API Rate Limiting Policy Template
A template for defining API rate limits per consumer tier, including burst allowances, quota...