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)
Aggregate Pattern: Consistency Boundaries in DDD
Encapsulate a cluster of domain objects treated as a single unit for data changes. An Aggregate...
AI LLM Cost Tracking Template
Track token usage and costs per feature, model, and user. Includes cost categories, pricing tables,...
AI LLM Prompt Template Library
A reusable prompt template library for common LLM tasks: summarization, extraction, classification,...
AI Model Selection Matrix
Compare LLM models by cost, latency, context window, accuracy, and use case. Includes decision...
AI RAG Evaluation Checklist
Pre-deployment checklist for RAG systems: retrieval precision, faithfulness, citations, latency,...
API Changelog Template
A template for documenting API changes including breaking changes, new features, deprecations, and...
Access Control Review Template
A template for auditing user access rights, verifying least privilege, and documenting access...
Disaster Recovery Test Plan
A template for planning and executing disaster recovery tests including failover validation, data...
Alert Runbook Template: From Page to Postmortem
A standardized runbook for responding to alerts: triage, diagnosis, mitigation, resolution, and...
Access Control Policy Template
A template for defining authentication, authorization, RBAC, ABAC, MFA, password policies, session...
API Authentication Design Template
Template for documenting API authentication: scheme selection, token lifecycle, JWT config, OAuth2...
Disaster Recovery Plan Template
Disaster recovery plan template with RTO/RPO targets, failover procedures, and recovery runbooks to...
Concurrency Patterns Guide
A guide to common concurrency patterns and what works for writing safe, efficient concurrent code.
A/B Testing Guide: Design, Statistics and Pitfalls
A practical guide to A/B testing: hypothesis design, sample sizing, statistical analysis, tooling,...
Complete Guide to Monitoring and Alerting
Build a production monitoring stack with Prometheus, Grafana, and AlertManager — plus the RED/USE...
Alert Management: On-Call Alerting That Works
A practical guide to alert management: cut alert fatigue, set severity levels, design escalation...
Disaster Recovery: RTO, RPO, and Resilient Recovery Runbooks
A practical guide to disaster recovery planning: defining RTO and RPO, backup strategies,...
GDPR Compliance — A Practical Guide for Developers
A developer-focused guide to GDPR compliance: data subject rights, lawful basis, data minimization,...
Secrets Management: Vault, Cloud Managers
A practical guide to secrets management: HashiCorp Vault, AWS Secrets Manager, Azure Key Vault, and...
Implement API Logging and Audit Trails
Set up request/response logging and audit trails that pass compliance reviews: structured output,...
Middleware: HTTP Request Interceptors
How to implement request/response middleware for logging, auth, and error handling across Python,...
Date Formatting in Python, JavaScript & Java
How to parse, format, and display dates across timezones in Python, JavaScript, and Java, with a...
Secure APIs with HTTP Security Headers
How to configure essential security headers like HSTS, CSP, and X-Frame-Options to protect APIs and...
Event-Driven Serverless Functions: Lambda & EventBridge
How to design loosely coupled systems using serverless functions triggered by events from message...