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)
Cron Jobs: Schedule Tasks in Linux, Python & Node.js
How to schedule and manage recurring tasks using cron syntax across Linux, Python, Node.js, and...
Set Up Pre-Commit Hooks with husky and lint-staged
Set up production-ready pre-commit hooks with husky, lint-staged and the pre-commit framework....
High-Performance Logging with pino
How to use pino for fast structured JSON logging in Node.js, including log levels, child loggers,...
Load Testing APIs with k6 and Threshold-Based Assertions
How to write and run load tests with k6 to measure API performance, validate SLOs, and identify...
Implement Mutation Testing
How to use mutation testing with mutmut, Stryker, and PIT to evaluate whether your tests actually...
Mock Network Requests with MSW
How to use Mock Service Worker (MSW) to intercept network requests in JavaScript tests and...
Perform Load Testing on APIs
How to simulate realistic traffic, measure response times, and identify bottlenecks using k6 and...
Mock External APIs with responses Library
How to mock HTTP API calls in Python tests using the responses library, including status codes,...
Set Up Test Fixtures (pytest, Jest, JUnit)
How to create, scope, and clean up test fixtures with pytest fixtures, Jest hooks, and JUnit 5...
Fixture Setup/Teardown: Reusable Test Context Lifecycle
How to use setup and teardown fixtures to create reusable test context. Covers beforeEach, factory...
Load Test Plan Template
Fillable load test plan template: scenarios, ramp-up profiles, pass/fail thresholds, monitoring...
Bug Report Template (Markdown + Examples)
A structured bug report template to help teams reproduce, triage, and resolve defects faster — with...
Changelog Template
A structured changelog template following Keep a Changelog conventions for tracking project...
ACID vs BASE — Consistency Models Explained
A practical guide comparing ACID and BASE consistency models: when to choose strong consistency and...
Complete Guide to Kubernetes Ingress
Configure and troubleshoot Kubernetes Ingress. Covers controllers, TLS with cert-manager, path...
Build a Slack Bot with OpenAI: Mentions, DMs, Memory
A conversational Slack bot powered by OpenAI that answers mentions and direct messages, keeps...
Build a GraphQL API with Apollo Server and TypeScript
How to build a production-ready GraphQL API using Apollo Server, TypeScript, and DataLoader to...
Retry Backoff: Budgets, Deadlines, and Library Configs
Implement resilient retry strategies with exponential backoff, jitter, and circuit breaker...
Retry Logic with Exponential Backoff
How to implement resilient retry logic with exponential backoff and jitter for transient failures...
Read and Write Files in Python, Node.js & Bash
How to read and write files safely in Python, Node.js, Bash and Java, with atomic writes and...
HMAC Request Signing for API Authentication (AWS Sig v4)
Secure API requests with HMAC signatures and AWS Signature v4 authentication for tamper-proof...
Cache-Aside Pattern
Load data into the cache on demand from the backing store. A caching pattern that gives the...
Dependency Injection Pattern
Supply dependencies from outside rather than creating them internally. An architectural pattern for...
Visitor Pattern
Represent an operation to be performed on elements of an object structure without changing the...