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)
Concurrent HTTP Requests with asyncio.gather and aiohttp
Fetch multiple HTTP endpoints concurrently using asyncio.gather and aiohttp with error handling,...
Encrypt and Decrypt Data with AES-GCM in Python
Encrypt sensitive data using AES-GCM with the cryptography library. Covers key derivation, nonce...
Secure JWT Refresh Token Rotation with Python
Implement secure JWT access and refresh token rotation in Python with blacklist, reuse detection,...
Prevent SQL Injection with SQLAlchemy Parameterized Queries
Protect Python applications from SQL injection using SQLAlchemy parameterized queries, ORM models,...
Multi-Tenant Data Isolation Pattern
Isolate tenant data in shared infrastructure using row-level security, schema-per-tenant, or...
Federated Identity Pattern
Delegate authentication to external identity providers. A pattern for integrating OAuth2, OIDC,...
Voucher Pattern
Validate claims and delegate access using signed vouchers without exposing sensitive data. A...
Complete Guide to LLM Prompt Engineering
Write effective prompts for AI models. Covers prompt patterns, few-shot learning, chain-of-thought,...
Complete Guide to API Versioning Strategies
Version REST and GraphQL APIs with URI, header, query param, and content negotiation strategies....
Complete Guide to Kafka Stream Processing
Build real-time event streaming pipelines with Kafka. Covers producers, consumers, Kafka Streams,...
Complete Guide to Microservices Communication
Compare sync vs async communication patterns for microservices. Covers REST, gRPC, message queues,...
Complete Guide to Python Asyncio
Master asynchronous Python programming with asyncio. Covers coroutines, tasks, event loops,...
Complete Guide to Elasticsearch Cluster Setup
Deploy and scale Elasticsearch clusters. Covers node roles, sharding, replicas, index templates,...
Complete Guide to PostgreSQL Tuning
Optimize PostgreSQL for high throughput. Covers configuration tuning, indexing strategies, query...
Complete Guide to CI/CD with GitHub Actions
Build CI/CD pipelines from scratch with GitHub Actions. Covers workflows, runners, matrix builds,...
Complete Guide to GitOps with ArgoCD
Deploy Kubernetes applications with GitOps using ArgoCD. Covers installation, ApplicationSets, sync...
Complete Guide to Kubernetes Ingress
Configure and troubleshoot Kubernetes Ingress controllers. Covers NGINX Ingress, TLS, path routing,...
Complete Guide to Terraform Modules
Build reusable Terraform modules with proper structure, inputs, outputs, and versioning. Covers...
Complete Guide to Mobile Responsive Design
Build responsive layouts that work on every device. Covers CSS Grid, Flexbox, container queries,...
Complete Guide to React Performance Optimization
Optimize React apps for speed. Covers memoization, virtualization, code splitting, bundle analysis,...
Complete Guide to AWS Cost Optimization
Reduce AWS cloud spend by 40%. Covers EC2 right-sizing, Spot instances, Reserved Instances, Savings...
Complete Guide to Observability with the Grafana Stack
Set up metrics, logs, and traces with Grafana, Prometheus, Loki, and Tempo. Covers instrumentation,...
Complete Guide to Web Security Headers
Implement CSP, HSTS, X-Frame-Options, and secure headers. Covers content security policy, CORS,...
Merge JSON Files in JavaScript
Combine multiple JSON files with conflict resolution strategies using Node.js.