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)
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...
Write-Behind Cache Pattern
Write to the cache synchronously and persist to the database asynchronously for high-throughput...
AI LLM Incident Response Runbook
Operational runbook for LLM production incidents: hallucination events, model outages, cost spikes,...
Data Migration Runbook Template with Rollback Steps
Use this data migration runbook template to plan safe migrations. Includes pre-migration checks,...
Weekly Ops Review Template
A template for summarizing incidents, costs, performance, and action items in weekly operations...
Serverless Cost Estimation Template
Template for estimating serverless costs per workload: invocation pricing, GB-second math, data...