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)
Rate Limiting
How to implement API rate limiting using token bucket, sliding window, and fixed window algorithms...
Composite Entity Pattern
Map a coarse-grained entity to multiple database tables by composing dependent objects, so the...
Iterator Pattern for Custom Collections
Access elements of an aggregate object sequentially without exposing its underlying representation...
Capacity Planning Forecast Template
A structured template for forecasting infrastructure growth, identifying resource bottlenecks, and...
Monitoring and Alerting Policy Template
A policy template that defines how alerts are configured, routed, escalated, and reviewed across...
Backend Engineer Onboarding Checklist
A thorough checklist for onboarding new backend engineers covering environment setup, codebase...
Browser Support Matrix Template
A template for tracking browser support targets, feature compatibility, polyfill requirements, and...
SQL Window Functions — Complete Guide
A practical guide to SQL window functions: ROW_NUMBER, RANK, DENSE_RANK, LEAD, LAG, SUM, AVG over...
Build a RAG Pipeline with LangChain and Vector Databases
How to build a Retrieval-Augmented Generation (RAG) pipeline using LangChain and vector databases...
Implement Property-Based Testing
How to write property-based tests with Hypothesis, fast-check, and jqwik that generate thousands of...
Decorator Pattern for HTTP Request Pipelines
Use the Decorator pattern to compose cross-cutting concerns like logging, metrics, and retries into...
Progressive Enhancement
Build a functional HTML baseline and add CSS and JavaScript layers on top. Covers feature...
Incident Timeline Template
A template for reconstructing the exact sequence of events during incident investigations to...
Zero-Downtime Deployment Checklist
A checklist to ensure production deployments complete without service interruptions using safe...
GraphQL Deprecation Policy Template
Policy template for deprecating GraphQL fields, types, and enum values without breaking clients,...
Third-Party Dependency Audit Template
A template for auditing third-party dependencies: license compliance, security vulnerabilities,...
Complete Guide to GraphQL Federation
Build unified GraphQL APIs across multiple services with Apollo Federation. Covers subgraphs,...
API Rate Limiting
Protect APIs from abuse and ensure fair resource usage with token bucket, sliding window, and leaky...
Input Validation: Schema-First Examples in 3 Languages
Validate user input at the API boundary with schema libraries. Pydantic, Zod, and Jakarta...
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...