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)
Complete Guide to GraphQL Federation
Build unified GraphQL APIs across multiple services with Apollo Federation. Covers subgraphs,...
Onion Architecture: Domain-Centric Design Guide
A practical guide to Onion Architecture: organize code around the domain, enforce inward...
Parallel DataFrame Operations with Dask
Scale pandas workflows with Dask. Process out-of-core DataFrames using lazy evaluation, partitions,...
Implement Event Sourcing in a Relational Database
Build event sourcing in a relational database. Store immutable events, project read models, and use...
Field-Level Auth with Custom GraphQL Directives
Add field-level authorization to GraphQL with custom schema directives. Check roles, permissions,...
Set Up Connection Pooling for Databases and HTTP Clients
Set up connection pooling for PostgreSQL, MySQL, Redis, and HTTP clients in Python, JavaScript, and...
Flyweight Pattern: Shared Objects for Memory Efficiency
Use the Flyweight pattern to share object state and cut memory usage. See Python, JavaScript, and...
Queue-Based Load Leveling: Smooth Traffic Spikes
Use Queue-Based Load Leveling to decouple producers and consumers, absorb traffic spikes, and...
GraphQL Mutation Validation: Centralized Input Checks
Centralize GraphQL mutation validation with reusable rules, custom scalars, and structured errors....
Send Transactional Emails with SMTP in Python, Node.js
Learn to send transactional and bulk emails via SMTP with Python, Node.js, and Java. Covers auth,...
Copy and Move Files Safely in Python, JS, Java, and Bash
Learn to copy and move files across platforms with Python, JavaScript, Java, and Bash. Includes...
Distributed Lock Pattern with Redis, ZooKeeper, and etcd
Coordinate exclusive access to shared resources across distributed nodes using Redis, ZooKeeper, or...
Build Semantic Search with Embeddings in Python, JS, Java
Build a semantic search engine with text embeddings and vector similarity. Includes Python,...
Parse Command Line Arguments: argparse, Commander & picocli
How to parse command line arguments in Python, Java, and Node.js CLI applications.
Large-Scale Aggregation with PySpark
How to perform group-by aggregations on large datasets with PySpark, covering window functions,...
Distributed Rate Limiting with FastAPI and Redis
Implement distributed rate limiting in FastAPI using Redis sliding window and token bucket...
Priority Queue Pattern: Schedule Tasks by Urgency
Use the Priority Queue pattern to process high-priority work first. See Python, Java, and...
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...