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)
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...
Web Performance Optimization
Improve Core Web Vitals, reduce bundle sizes, and optimize frontend performance with lazy loading,...
Implement Event Sourcing in Serverless Architectures
How to capture all changes as immutable events using event sourcing with AWS Lambda, DynamoDB...
Build Serverless Functions
Create and deploy serverless functions with AWS Lambda, Google Cloud Functions, and Azure Functions...
Orchestrate Serverless Workflows with Step Functions and
How to coordinate complex serverless processes using AWS Step Functions, Temporal, and Durable...
Generate Test Data
How to generate realistic, deterministic test data with Faker, factory-boy, and type-aware...
Implement Mutation Testing
How to use mutation testing with MutPy, Stryker, and PIT to evaluate whether your tests actually...
Perform Load Testing on APIs
How to simulate realistic traffic, measure response times, and identify bottlenecks using k6 and...
Measure Test Coverage
How to measure, report, and enforce code coverage with branch and condition coverage using...
Interpreter Pattern for Domain-Specific Expression Languages
Build a language interpreter that evaluates expressions and rules by representing grammar as...
Message Deduplication Pattern
Prevent duplicate processing by tracking message IDs with idempotency keys. Consumers check a store...
Message Queue Load Leveling Pattern
Smooth traffic spikes by placing a queue between a producer and a consumer. The producer writes...
Sequential Convoy Pattern
Preserve message ordering for related messages in a distributed system by grouping them into...
Transform Data in the Warehouse with dbt
How to use dbt for SQL-based data transformations with models, tests, materializations, macros, and...
Build an ETL Pipeline with pandas and Parquet
How to build an extract-transform-load pipeline using pandas for data processing and Parquet for...
High-Performance DataFrame Operations with Polars
How to use Polars for fast DataFrame operations with lazy evaluation, expression API, streaming,...
Override Docker Compose Configs per Environment
How to use Docker Compose override files for environment-specific configurations, covering dev,...
Slim Production Images with Multi-Stage Docker Builds
How to build minimal production Docker images using multi-stage builds with distroless base images,...
Across Multiple OS and Language Versions with GitHub
How to use GitHub Actions matrix strategy to test across multiple operating systems, language...