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)
Thread-Safe Collections: Blocking Queues and Concurrent Maps
How to safely share collections between threads using concurrent data structures—blocking queues,...
APScheduler BackgroundScheduler: Prevent Overlapping Jobs
Run cron-like jobs in Python using APScheduler. Covers interval, cron, and date triggers, job...
Parse and Write TOML Files: Python, Java & JS Examples
How to parse and write TOML configuration files in Python, Java, and JavaScript.
Optimistic Locking to Prevent Lost Database Updates
Implement optimistic locking with versioning to prevent lost updates. Examples in SQL, Node.js,...
Measure and Enforce Python Test Coverage with pytest-cov
Measure and enforce coverage with pytest-cov: branch coverage, HTML reports, exclusions, CI...
Context Object Pattern: Examples
Learn the Context Object Pattern to reduce parameter bloat. Practical examples in Python, Java, and...
Technical Specification Template
Use this technical specification template to document requirements, design decisions, architecture,...
GraphQL API Design Guidelines
GraphQL API design guidelines with schema structure, naming, mutations, pagination, auth, rate...
Test Strategy Document Template
Define your testing approach with this test strategy document template. Covers scope, types, tools,...
AI Agents with Tool Use
Build autonomous AI agents that can use external tools and APIs to accomplish complex tasks.
Implement API Rate Limiting with Redis
Protect APIs from abuse using token bucket and sliding window algorithms with Redis, including...
Handle CORS Correctly
How to configure Cross-Origin Resource Sharing (CORS) headers correctly for APIs, SPAs, and...
REST API Design: What Works
Design reliable, scalable REST APIs with proper HTTP methods, status codes, versioning, and...
Build a Bidirectional Chat with WebSocket and Node.js
How to build a real-time bidirectional chat application using WebSocket with room-based messaging,...
HTTP Cache-Control Headers for APIs and Static Assets
Set Cache-Control, ETag, and Last-Modified headers to control browser and CDN caching for API...
Batch Processing Patterns
Design reliable batch processing pipelines for large datasets with retry logic, idempotency, and...
Parse JSON
How to parse JSON strings into native data structures across multiple programming languages.
JavaScript Event Loop
Understand how the JavaScript event loop works internally and how to write non-blocking code.
Cursor-based Pagination with GraphQL Relay Connections
Implement Relay-style cursor pagination in GraphQL with edges, nodes, and pageInfo for efficient...
Implement Cache Invalidation Strategies
How to keep caches consistent with databases using TTL, write-through, write-behind, and...
Caching Strategies
Implement useful caching strategies for databases, APIs, and frontends using Redis, CDNs, and...
Optimize Queries with Database Indexing
How to create, analyze, and maintain indexes to speed up database queries and avoid common indexing...
Optimize Slow Database Queries
How to identify, analyze, and fix slow SQL queries using EXPLAIN, query refactoring, and...