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)
Event Sourcing Pattern
Store the state of an application as a sequence of events rather than storing only the current...
Geode Pattern: Partition Data Across Independent Nodes
Partition data so each node owns a non-overlapping shard with its own storage. Horizontal scaling...
Marker Interface Pattern
Use empty interfaces as metadata tags: when an empty interface beats annotations, how Java's...
Test Case Template with Steps, Expected Results & Examples
A standardized test case format with steps, expected results, preconditions, and postconditions for...
Complete Guide to Microservices Communication
Compare sync vs async communication patterns for microservices. Covers REST, gRPC, message queues,...
NoSQL Data Modeling Patterns
A practical guide to NoSQL data modeling: embedding vs referencing, access pattern-driven design,...
SOLID Principles Explained with Examples
Learn the five SOLID principles with bad-vs-good code examples and a full before/after refactor of...
Complete Guide to Mobile Responsive Design
Build layouts that work on every screen. Mobile-first breakpoints, Grid, Flexbox, container...
CORS Security: Origins, Headers, Preflight, Credentials
How CORS actually works: same-origin policy, preflight requests, CORS headers, credential handling,...
Grafana Dashboards for Observability with Prometheus
Build Grafana dashboards that visualize Prometheus metrics. Use panels, template variables,...
Metrics Collection and Alerting with Prometheus
Instrument applications and infrastructure with Prometheus metrics, configure alerting rules, and...
Expose Custom Application Metrics with Python and Prometheus
Build a custom Prometheus metrics exporter in Python using prometheus_client. Covers counters,...
File Upload Validation: Secure File Handling Guide
How to handle file uploads securely with size, type, and content validation.
Node.js File Upload Validation: Type, Size, and Content
Validate file uploads in Node.js with multer for type, size, and content
Dead Letter Queues: Setup for SQS, RabbitMQ & Kafka
Configure dead letter queues on SQS, RabbitMQ, and Kafka: redrive policies, dead-letter exchanges,...
Configure Dead-Letter Queues in RabbitMQ for Failed Messages
Set up dead-letter queues and exchanges in RabbitMQ with TTL expiry, max length limits,...
Expose Metrics with Micrometer and Prometheus
How to expose custom application metrics using Micrometer and Prometheus in Spring Boot, including...
Prometheus API Monitoring
Monitor API performance and health with Prometheus metrics, custom collectors, and alerting rules.
Expose Business Metrics with Prometheus
How to expose custom business metrics in Python using prometheus_client, including counters,...
Structured Logging
Implement structured logging with JSON output, correlation IDs, and log aggregation for production...
Build Serverless APIs with API Gateway
How to design, deploy, and manage serverless HTTP APIs using AWS API Gateway, Lambda, and...
Dead Letter Channel Pattern
Route unprocessable messages to a separate dead letter queue for inspection and replay. Prevent...
Front Controller Pattern in Java, Python and PHP
Route all incoming requests through a single handler that dispatches to the appropriate page...