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)
Validate DataFrame Schemas with Pandera
How to validate pandas and Polars DataFrame schemas with Pandera, covering column types, constraints, custom checks, hypothesis testing,...
Transform Data in the Warehouse with dbt
How to use dbt for SQL-based data transformations with models, tests, materializations, macros, and incremental loading in a data warehouse.
Build an ETL Pipeline with pandas and Parquet
How to build an extract-transform-load pipeline using pandas for data processing and Parquet for columnar storage with type coercion and...
High-Performance DataFrame Operations with Polars
How to use Polars for fast DataFrame operations with lazy evaluation, expression API, streaming, and interop with pandas for large datasets.
Large-Scale Aggregation with PySpark
How to perform group-by aggregations on large datasets with PySpark, covering window functions, UDFs, broadcast joins, and performance...
Recursive CTEs for Hierarchical Data Queries
How to query hierarchical data with recursive Common Table Expressions in SQL, covering tree traversal, org charts, category trees, and...
Override Docker Compose Configs per Environment
How to use Docker Compose override files for environment-specific configurations, covering dev, test, staging, production, profiles, and...
Slim Production Images with Multi-Stage Docker Builds
How to build minimal production Docker images using multi-stage builds with distroless base images, covering Go, Node.js, Python, and Java...
Across Multiple OS and Language Versions with GitHub
How to use GitHub Actions matrix strategy to test across multiple operating systems, language versions, and configurations with include,...
Share Workflow Logic with GitHub Actions Reusable Workflows
How to create and consume reusable workflows in GitHub Actions, covering inputs, secrets, conditional jobs, matrix strategy, and...
Mount Configs and Secrets into Kubernetes Pods
How to mount ConfigMaps and Secrets into Kubernetes pods using env vars, volumes, projected volumes, and secret management with external...
Package Kubernetes Manifests with Helm Charts
How to create, template, and deploy Kubernetes applications using Helm charts, covering values, conditionals, ranges, hooks, subcharts, and...
Store Terraform State in S3 with DynamoDB Locking
How to configure Terraform remote state with S3 backend and DynamoDB locking, covering state isolation, workspace management, encryption,...
Isolate Environments with Terraform Workspaces
How to use Terraform workspaces for environment isolation, covering workspace creation, conditional resources, variable management, and...
Container Queries for Component Responsiveness
How to use CSS container queries for component-level responsive layouts that adapt to their container size instead of the viewport.
Design Tokens with CSS Custom Properties
How to build a design token system using CSS custom properties, including color scales, spacing, typography, themes, and responsive scaling.
Dark Mode with prefers-color-scheme and CSS Variables
How to implement dark mode using CSS prefers-color-scheme media query, CSS custom properties, and manual toggle with localStorage...
Form Validation with react-hook-form and Zod
How to build type-safe forms in React using react-hook-form with Zod schema validation, including nested fields, async validation, and...
When to Use useMemo and useCallback
How and when to use React's useMemo and useCallback hooks for performance optimization, and when they add unnecessary overhead.
Virtualize Long Lists with react-window
How to render large lists efficiently in React using react-window for DOM virtualization, including fixed and variable height rows and grid...
Reactive State Management with Svelte Stores
How to manage reactive state in Svelte using writable, readable, derived stores, and custom stores with contract-based updates.
Exhaustive Type Checking with Discriminated Unions
How to use TypeScript discriminated unions for exhaustive type checking, ensuring all cases are handled at compile time with never type...
Build Reusable Utility Types with Generics
How to create reusable TypeScript utility types using conditional types, mapped types, template literals, and generic constraints for...
Data Fetching with Vue 3 Composition API
How to fetch and manage data in Vue 3 using the Composition API with ref, computed, watch, and composables for reusable data logic.