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)
Two-Factor Authentication (2FA / TOTP)
How to implement time-based one-time password (TOTP) two-factor authentication for secure user...
Vitest Snapshot Testing for React
How to use Vitest snapshot testing to catch unintended UI changes in React components, including...
Snapshot Testing React Components with Jest
How to use Jest snapshot testing to catch unintended UI regressions in React components and prevent...
Batch-to-Streaming Bridge: One Lake for Both Pipelines
Merge batch ETL and real-time streaming into one queryable data lake. Lambda architecture with...
Ambassador Pattern: Resilient Remote Calls via Local Proxy
Offload retries, timeouts, and circuit breaking to a local ambassador that wraps remote service...
Gatekeeper Pattern: Centralized Edge Security
Centralize authentication, rate limiting, and input sanitization at the system edge. Gatekeeper...
Intercepting Filter: Pluggable Request Pipelines
Compose cross-cutting concerns into a chain of pluggable filters that intercept requests and...
Prototype Pattern: Clone Objects Instead of Rebuilding
Create objects by cloning pre-configured instances instead of rebuilding them from scratch....
Snapshot Testing: Capture and Compare Serialized Output
How to use snapshot testing to detect unintended changes in serialized output. Covers Jest...
API Monitoring & Alerting Template
A template for defining API SLA thresholds, error rate alerts, and monitoring dashboards.
Secrets Rotation Runbook
Runbook for rotating secrets without downtime: secret inventory, dual-key rotation, AWS Secrets...
API Error Response Template
A reusable template for consistent, informative, and developer-friendly API error responses that...
Azure Basics — Core Services for Developers
A practical guide to Microsoft Azure core services for developers: compute, storage, databases,...
Safely Extract Zip Files with Python
How to extract and validate zip archives securely using Python zipfile and shutil.
Human-in-the-Loop Pattern
Pause LLM agent execution for human approval before high-impact actions. Route decisions to a...
Twin Pattern
Link two classes through mutual references so they delegate methods to each other: a...
Islands Architecture: Partial Hydration for Faster Pages
Server-render the page as static HTML and hydrate only the interactive islands. Covers Astro client...
Circuit Breaker Half-Open
How to test service recovery with half-open circuit breaker state transitions. Covers closed, open,...
Failover: Switch to Standby on Primary Failure Detection
How to move traffic to a standby system when the primary fails. Covers active-passive,...
API Deprecation Notice Template
A template for communicating API deprecations, breaking changes, and sunset timelines to consumers.
CI/CD Pipeline Security Template
A template for securing build and deployment pipelines against credential leaks, tampering, supply...
On-Call Runbook Template
A template documenting common alerts and step-by-step response procedures for on-call engineers.
Frontend Performance Budget Template
A template for defining JS, CSS, image, and font budgets per route — with a method for picking the...
Cache Invalidation Pattern
Strategies for keeping cached data fresh: TTL expiration, explicit invalidation, write-through, and...