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)
Correlation ID: Trace Requests Across Distributed Services
How to propagate correlation IDs across service boundaries for end-to-end request tracing. Covers...
Distributed Tracing: Propagate Trace Context Across Services
How to propagate trace context across service boundaries with OpenTelemetry. Covers span creation,...
Health Check Pattern: Expose Liveness and Readiness Probes
How to implement liveness and readiness probes for container orchestration. Covers Kubernetes...
Metrics Aggregation: Collect, Tag
How to collect, tag, and aggregate business metrics for observability. Covers Prometheus,...
Structured Logging: Emit JSON Logs with Consistent Fields
How to emit structured JSON logs with consistent fields for searchability. Covers Python structlog,...
Bulkhead Pattern: Isolate Resources to Limit Blast Radius
How to isolate resources per service to limit blast radius. Covers thread pool isolation,...
Graceful Shutdown: Drain In-Flight Requests Before Exit
How to drain in-flight requests before process exit. Covers signal handling, health check removal,...
Token Bucket Rate Limiter: Smooth Traffic with Token Buckets
How to implement token bucket rate limiting for API protection. Covers bucket refill, burst...
Retry with Jitter: Exponential Backoff and Random Jitter
How to retry failed operations with exponential backoff and random jitter. Covers full jitter,...
Contract Testing: Verify Consumer-Producer API Contracts
How to use contract testing to verify that API producers and consumers agree on request and...
Fixture Setup/Teardown: Reusable Test Context Lifecycle
How to use setup and teardown fixtures to create reusable test context. Covers beforeEach, factory...
Mock Server: Stand Up a Mock Server for Integration Test
How to use mock servers to isolate integration tests from external dependencies. Covers WireMock,...
Parameterized Test: Run the Same Logic Across Multiple
How to write parameterized tests to verify the same logic across multiple inputs. Covers pytest...
Snapshot Testing: Capture and Compare Serialized Output
How to use snapshot testing to detect unintended changes in serialized output. Covers Jest...
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...
Test Pyramid: Balance Unit, Integration
How to structure a test suite using the test pyramid. Covers unit, integration, and E2E test...
Data Governance Policy Template
A template for data classification, retention, access control, privacy, and compliance policies...
Data Pipeline Design Document Template
A template for documenting data pipeline sources, transformations, sinks, scheduling, error...
Data Quality Rules Template
A template for defining data validation rules per dataset and column: completeness, consistency,...
ETL Job Runbook Template
A runbook for operating, monitoring, and troubleshooting ETL jobs: startup, shutdown, health...
CI/CD Pipeline Design Template
A template for documenting CI/CD pipeline stages, gates, environments, deployment strategies,...
Helm Chart Review Checklist
A checklist for reviewing Helm charts covering values, templates, security, resource limits,...
Kubernetes Pod Disruption Budget Template
A template for defining Pod Disruption Budgets to control voluntary disruptions during node drains,...
Terraform State Management Policy
A policy for managing Terraform state files: backend configuration, locking, isolation, access...