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)
Sentry: Error Tracking, Triage, and Resolution
Master Sentry for production error tracking. Covers SDK integration in Python, Node.js, and Java,...
Recursive CTEs for Hierarchical Data Queries
How to query hierarchical data with recursive Common Table Expressions in SQL, covering tree...
Implement Graceful Shutdown and Zero-Downtime Restarts
How to implement graceful shutdown and zero-downtime restarts for web servers, workers, and...
Mock GraphQL Resolvers for Frontend Development
Set up mocked GraphQL resolvers with Apollo Server so frontend teams can develop against a fake API...
Implement Encryption at Rest for Databases and File Storage
How to encrypt sensitive data before storing it in databases, object storage, and backups using...
Write Unit Tests with Mocks and Stubs
How to isolate code under test using mock objects, stubs, and spies to replace external...
Pipes and Filters Pattern: Composable Data Pipelines
Chain processing steps with independent filters connected by pipes. A pattern for data...
Model-View-ViewModel (MVVM) Pattern
Bind UI components declaratively to a ViewModel that exposes data and commands, enabling automatic...
Server-Sent Events (SSE): One-Way Real-Time Streaming
Implement one-way real-time streaming from server to browser using Server-Sent Events. Covers...
Implement Server-Sent Events in Go for Real-Time Updates
Build a production-ready Server-Sent Events endpoint in Go with connection management, heartbeat...
Design a Scalable API Gateway for Microservices
Build an API gateway that routes requests, handles authentication, rate limiting, caching, and...
Caching & Memoization in Python, JavaScript, and Java
How to cache expensive computations and API responses using in-memory LRU, TTL, and distributed...
UUID Generation in Python, JavaScript, and Java
Generate universally unique identifiers (UUIDs) for database keys, session tokens, and resource...
CLI Argument Parsing in Python, JS, Java, Go, and Rust
Build command-line tools that handle flags, positional arguments, subcommands, and validation in...
Feature Flags: Rollout, Targeting, and Safe Rollback
Implement feature toggles to roll out, test, and revert functionality safely without redeploying...
Form Validation with react-hook-form and Zod
Build type-safe forms in React using react-hook-form with Zod schema validation, including nested...
Enable Brotli Compression in Nginx for Static Assets
Configure Brotli compression in Nginx to shrink JavaScript, CSS, and HTML assets with better ratios...
Stub External HTTP APIs with WireMock in Java
Use WireMock in Java tests to stub external HTTP services. Covers response templating, delay...
Bridge Pattern: Decouple Abstraction from Implementation
Split a class into two hierarchies — abstraction and implementation — so both can evolve...
GraphQL Federated Entity Pattern
Share an entity across Apollo Federation subgraphs. Use @key, @external, and @shareable so each...
SQL CTEs: Common Table Expressions Explained
A practical guide to SQL CTEs: non-recursive and recursive expressions, readability, performance,...
Terraform Best Practices: Modules, State, and Workspaces
A practical guide to Terraform best practices: module design, remote state management, workspaces,...
Bundle Size Optimization: A Practical Frontend Guide
A hands-on guide to measuring and reducing JavaScript bundle size with tree shaking, code...
Call a REST API: Python, JavaScript, Java & Go Examples
How to make HTTP requests to a REST API and handle the JSON response in Python, JavaScript, Java,...