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 (1008)
HMAC Request Signing for API Authentication (AWS Sig v4)
Secure API requests with HMAC signatures and AWS Signature v4 authentication for tamper-proof...
Cache-Aside Pattern
Load data into the cache on demand from the backing store. A caching pattern that gives the...
Dependency Injection Pattern
Supply dependencies from outside rather than creating them internally. An architectural pattern for...
Visitor Pattern
Represent an operation to be performed on elements of an object structure without changing the...
GraphQL Schema Stitching Pattern
Merge multiple independent GraphQL schemas into a single unified schema that clients can query as...
Cross-Region Failover Test Template
A runbook-style template for planning, executing, and documenting a cross-region failover test with...
Terraform Module Versioning Policy Template
A ready-to-adapt policy for versioning and publishing Terraform modules: semver rules,...
Content Security Policy: CSP Headers, Nonces, Hashes
Deploy Content Security Policy without breaking your site: directives, nonces, hashes,...
Encryption at Rest: AES-256, KMS, Envelope Encryption
Encrypt stored data correctly: AES-256-GCM, KMS-managed keys, envelope encryption, key rotation,...
CDN Cache Invalidation Strategies and Patterns
Implement CDN cache invalidation using purge APIs, surrogate keys, tag-based invalidation, and...
HTTP Cache-Control Headers for APIs and Static Assets
Set Cache-Control, ETag, and Last-Modified headers to control browser and CDN caching for API...
Parse Excel Files in Python, JavaScript, and Java
How to read and write Excel (.xlsx) files in Python, JavaScript, and Java with openpyxl, SheetJS,...
Override Docker Compose Configs per Environment
How to use Docker Compose override files for environment-specific configurations, covering dev,...
Server-Side Rendering
Improve performance and SEO with server-side rendering using Next.js, Nuxt, Astro, and other...
Active Record Pattern
Wrap a database table or view in a class where an instance is tied to a single row, and the class...
Circuit Breaker Pattern in Python, JavaScript, and Java
Prevent cascading failures by stopping requests to failing services. An architectural pattern for...
Saga Pattern: Orchestration vs Choreography
Manage distributed transactions across multiple services by chaining local transactions with...
Timeout Pattern
Prevent operations from hanging indefinitely by enforcing a maximum execution time. A resilience...
Bulkhead Pattern: Isolate Resources to Limit Blast Radius
Isolate resources per service to limit blast radius. Covers thread pool isolation, connection pool...
Post-Deployment Verification Checklist Template
A checklist template for verifying deployments: health checks, smoke tests, metric validation, and...
Database Denormalization: Storage for Read Speed
A practical guide to database denormalization: when to trade storage for read performance, common...
Complete Guide to OWASP Top 10 2025
Mitigate each risk in the OWASP Top 10 2025 list with practical code examples. Covers the new...
Build Real-Time Notifications with WebSockets
Implement a real-time notification system using WebSockets and Redis pub/sub for broadcasting...
Polars: High-Performance DataFrame Operations in Python
How to use Polars for fast DataFrame operations with lazy evaluation, expression API, streaming,...