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)
Load Test Plan Template
Template for planning and documenting load tests: test scenarios, user journey definitions, ramp-up...
Performance Budget Template
Template for defining and enforcing web performance budgets: LCP, INP, CLS targets, resource...
API Authentication Design Template
Template for documenting API authentication flows and token lifecycle: auth scheme selection, token...
Dependency Vulnerability Triage Template
Template for triaging CVEs by severity and impact: vulnerability scoring, exploitability...
OWASP Top 10 Remediation Checklist
Checklist for tracking OWASP Top 10 vulnerability remediation per application: risk assessment, fix...
Serverless Cold Start Runbook
Runbook for diagnosing and mitigating serverless cold starts: causes, measurement, optimization...
Serverless Function Deployment Checklist
Pre-deploy and post-deploy checklist for serverless functions (AWS Lambda, Azure Functions, GCP...
Serverless Security Checklist
Security hardening checklist for serverless functions: IAM least privilege, secret management,...
Complete Guide to AI Agents in Production
Build production AI agents. Covers agent architectures, tool use, planning, memory, multi-agent...
Complete Guide to LangChain in Production
Run LangChain in production. Covers chains, agents, memory, tools, LCEL, streaming, callbacks, RAG...
Complete Guide to LLM Application Architecture
Build production LLM applications end-to-end. Covers API layers, prompt management, streaming,...
Complete Guide to LLM Cost Optimization
Optimize LLM costs in production. Covers model routing, prompt compression, caching, batch API,...
Complete Guide to LLM Evaluation
Evaluate LLM applications in production. Covers RAGAS, LLM-as-judge, human evaluation, A/B testing,...
Complete Guide to LLM Security
Secure LLM applications in production. Covers prompt injection, jailbreaks, data leakage, OWASP Top...
Complete Guide to OpenAI API Mastery
Master the OpenAI API in production. Covers chat completions, streaming, function calling,...
Complete Guide to RAG in Production
Build production RAG systems. Covers chunking strategies, embedding models, vector stores,...
Complete Guide to Vector Databases
Compare and use vector databases in production. Covers Pinecone, Weaviate, Chroma, pgvector,...
GraphQL Federation in Production
Run federated GraphQL in production with confidence. Covers subgraph composition, gateway...
Complete Guide to GraphQL Schema Design
Design GraphQL schemas for evolution, performance, and maintainability. Covers type design,...
Complete Guide to GraphQL Security
Secure GraphQL APIs against introspection leaks, query depth attacks, cost-based DoS, batching...
Complete Guide to GraphQL Testing
Test GraphQL APIs at every layer: unit tests for resolvers, integration tests for schema, E2E tests...
Complete Guide to Application-Level Caching
Implement in-memory, distributed, and hybrid caches at the application layer. Covers LRU caches,...
Complete Guide to Cache Invalidation
Master cache invalidation strategies: TTL expiration, event-driven invalidation, versioned keys,...
Complete Guide to CDN Caching Strategy
Design CDN caching for web applications and APIs. Covers edge caching, cache keys, cache headers,...