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)
Fallover: Switch to Standby on Primary Failure Detection
How to switch to a standby system on primary failure detection. Covers active-passive, active-active, health monitoring, DNS fallover,...
Graceful Shutdown: Drain In-Flight Requests Before Exit
How to drain in-flight requests before process exit. Covers signal handling, health check removal, connection draining, timeout...
Token Bucket Rate Limiter: Smooth Traffic with Token Buckets
How to implement token bucket rate limiting for API protection. Covers bucket refill, burst handling, per-key buckets, distributed rate...
Retry with Jitter: Exponential Backoff and Random Jitter
How to retry failed operations with exponential backoff and random jitter. Covers full jitter, equal jitter, decorrelated jitter, retry...
Contract Testing: Verify Consumer-Producer API Contracts
How to use contract testing to verify that API producers and consumers agree on request and response shapes. Covers Pact consumer-driven...
Fixture Setup/Teardown: Reusable Test Context Lifecycle
How to use setup and teardown fixtures to create reusable test context. Covers beforeEach, factory functions, fixture objects, and cleanup...
Golden Master Testing
How to use golden master testing to characterize legacy code behavior before refactoring. Covers capturing output, comparing baselines, and...
Mock Server: Stand Up a Mock Server for Integration Test
How to use mock servers to isolate integration tests from external dependencies. Covers WireMock, nock, MSW, and Mountebank with...
Parameterized Test: Run the Same Logic Across Multiple
How to write parameterized tests to verify the same logic across multiple inputs. Covers pytest parametrize, Jest test.each, JUnit...
Snapshot Testing: Capture and Compare Serialized Output
How to use snapshot testing to detect unintended changes in serialized output. Covers Jest snapshots, pytest snapshot, and inline vs...
Test Double: Replace Dependencies with Stubs, Spies, Fakes
How to use test doubles to isolate units under test. Covers stubs, spies, fakes, mocks, and dummy objects with examples in Python,...
Test Pyramid: Balance Unit, Integration
How to structure a test suite using the test pyramid. Covers unit, integration, and E2E test proportions, the testing trophy, and ice cream...
Data Governance Policy Template
A template for data classification, retention, access control, privacy, and compliance policies covering GDPR, CCPA, and SOC 2 requirements.
Data Pipeline Design Document Template
A template for documenting data pipeline sources, transformations, sinks, scheduling, error handling, and monitoring with schema...
Data Quality Rules Template
A template for defining data validation rules per dataset and column: completeness, consistency, accuracy, timeliness, and uniqueness...
ETL Job Runbook Template
A runbook for operating, monitoring, and troubleshooting ETL jobs: startup, shutdown, health checks, common failures, diagnostics, and...
CI/CD Pipeline Design Template
A template for documenting CI/CD pipeline stages, gates, environments, deployment strategies, rollback procedures, and security scanning.
Helm Chart Review Checklist
A checklist for reviewing Helm charts covering values, templates, security, resource limits, probes, RBAC, and best practices.
Kubernetes Pod Disruption Budget Template
A template for defining Pod Disruption Budgets to control voluntary disruptions during node drains, upgrades, and maintenance windows.
Terraform State Management Policy
A policy for managing Terraform state files: backend configuration, locking, isolation, access control, versioning, and disaster recovery.
Accessibility Audit Checklist
A WCAG 2.2 compliance checklist covering perceivable, operable, understandable, and robust criteria with testing tools and remediation...
Browser Support Matrix Template
A template for tracking browser support targets, feature compatibility, polyfill requirements, and fallback strategies across the browser...
Component API Documentation Template
A template for documenting UI component APIs: props, events, slots, methods, accessibility, and usage examples with TypeScript types.
Frontend Performance Budget Template
A template for defining JS, CSS, image, and font budgets per route with enforcement strategies and monitoring thresholds.