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)
Custom Health Checks with Spring Boot Actuator
How to implement custom health indicators with Spring Boot Actuator, including database, Redis, external API checks, and Kubernetes...
Expose Metrics with Micrometer and Prometheus
How to expose custom application metrics using Micrometer and Prometheus in Spring Boot, including counters, gauges, timers, and histograms.
High-Performance Logging with pino
How to use pino for fast structured JSON logging in Node.js, including log levels, child loggers, transports, and integration with Express...
Error Tracking with Sentry in Express
How to integrate Sentry for error tracking in Node.js Express applications, including error handlers, performance monitoring, release...
Rotate Logs Daily with Winston
How to configure daily log rotation in Node.js using winston and winston-daily-rotate-file, including size limits, retention, compression,...
Distributed Tracing with OpenTelemetry
How to implement distributed tracing in Python with OpenTelemetry SDK, including spans, context propagation, auto-instrumentation, and...
Expose Business Metrics with Prometheus
How to expose custom business metrics in Python using prometheus_client, including counters, gauges, histograms, summaries, and Flask...
Structured JSON Logging with structlog
How to emit structured JSON logs in Python using structlog, including context binding, log levels, processors, and integration with...
Detect Bugs in Java with SpotBugs Static Analysis
How to configure SpotBugs for Maven and Gradle, interpret bug patterns, suppress false positives, and integrate with CI/CD pipelines.
Enforce Security Rules in Node.js with
How to configure eslint-plugin-security to detect insecure patterns in Node.js code, handle false positives, and integrate with CI/CD...
Find Security Issues in Python Code with Bandit
How to use Bandit to scan Python code for common security vulnerabilities, configure ignore lists, integrate with CI/CD, and interpret...
Strict Type Checking in Python with mypy
How to configure mypy strict mode for Python projects, handle common type errors, use Protocol and TypeGuard, and integrate with CI/CD.
Scan Python Packages for Known CVEs with pip-audit
How to use pip-audit to scan Python dependencies for known vulnerabilities, configure ignore lists, integrate with CI/CD, and remediate...
Strict TypeScript ESLint Configuration for Production
How to configure typescript-eslint with strict rules for production TypeScript projects, handle type-aware linting, and integrate with...
Java Testcontainers Integration Tests
How to use Testcontainers in JUnit5 to spin up real Postgres, Redis, and Kafka containers for integration tests that are reliable and...
Mock Network Requests with MSW
How to use Mock Service Worker (MSW) to intercept network requests in JavaScript tests and development, including REST and GraphQL mocking.
Test Express APIs with supertest
How to test Express.js REST API endpoints end-to-end using supertest, including status codes, JSON bodies, headers, authentication, and...
Property-Based Testing with Hypothesis
How to use Hypothesis for property-based testing in Python, generating hundreds of test cases automatically from strategies instead of...
Mock External APIs with responses Library
How to mock HTTP API calls in Python tests using the responses library, including status codes, headers, JSON bodies, and error simulation.
Pytest Fixtures and Parametrize
How to use pytest fixtures and @pytest.mark.parametrize to write data-driven tests with reusable setup logic across Python projects.
Ambassador: Offload Cross-Cutting Concerns to a Proxy
How to offload cross-cutting concerns to a proxy ambassador. Covers connection pooling, retry logic, circuit breaking, monitoring, and TLS...
Anti-Corruption Layer: Isolate Legacy with Adapters
How to isolate legacy systems with translation adapters. Covers ACL facade, domain translation, bidirectional mapping, and gradual legacy...
Backends for Frontends: Dedicated Backend per Client Type
How to create dedicated backends per client type. Covers BFF for web, mobile, and desktop. Covers API aggregation, client-specific...
Modular Monolith: Single Deployable with Module Boundaries
How to build a modular monolith with strict internal module boundaries. Covers module isolation, shared kernel, inter-module communication,...