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)
Implement the Transactional Outbox Pattern for Reliable
Use the transactional outbox pattern to reliably publish domain events alongside database changes,...
Implement Redis Pub/Sub Messaging in Python
Build real-time pub/sub messaging with Redis and Python including pattern subscriptions, message...
LLM Fallback Pattern
Fall back to alternative LLM providers or models when the primary fails. Handle rate limits,...
LLM Guardrails Pattern
Validate LLM inputs and outputs with rules, classifiers, and content filters. Prevent prompt...
LLM Router Pattern
Route queries to different LLM models based on complexity, cost, and latency requirements. Classify...
RAG Hybrid Search Pattern
Combine keyword (BM25) and semantic (vector) search to improve retrieval accuracy in RAG pipelines....
Deployment Ring Pattern
Roll out changes progressively in rings of increasing size. Start with a small group, verify...
Graceful Degradation Pattern
Degrade functionality instead of failing when dependencies are unavailable. Serve partial results,...
Read-Through Cache Pattern
A transparent cache layer that intercepts read requests, fetches from the data source on miss, and...
Serverless Event Sourcing Pattern
Store function state as an append-only event log so workflows can be replayed, audited, and...
Serverless Fanout Pattern
Broadcast a single event to multiple independent consumers via SNS, EventBridge, or SQS so each...
Serverless Function Composition Pattern
Chain serverless functions via Step Functions or orchestration layers to build multi-step workflows...
Serverless Throttling Pattern
Handle backpressure in serverless by using SQS, token buckets, and concurrency limits to protect...
Serverless Warm Pool Pattern
Keep Lambda functions warm by sending periodic ping events to reduce cold start latency for...
Shed Load Pattern
Drop requests proactively under extreme load to protect the system. Reject excess traffic before it...
Two-Level Cache Pattern
Combine an L1 in-memory cache with an L2 distributed cache to reduce latency for hot keys while...
Write-Through Cache Pattern
Synchronously write to both cache and backing store so the cache always has the latest data without...
GraphQL Batched Resolver Pattern
Resolve nested GraphQL fields in a single batched request to eliminate N+1 queries and reduce...
GraphQL Connection Pagination Pattern
Implement Relay-style cursor-based pagination with edges, nodes, and pageInfo for stable GraphQL...
GraphQL DataLoader Pattern
Coalesce individual load requests into batched calls with per-request caching to prevent N+1...
GraphQL Interface Polymorphism Pattern
Model polymorphic types with GraphQL interfaces to share field contracts across different object...
Fine-Tune and Deploy Text Classifiers with Hugging Face
Fine-tune a pre-trained transformer model for text classification using Hugging Face Trainer,...
Evaluate RAG Quality with RAGAS Metrics
Measure RAG pipeline quality using RAGAS framework metrics — faithfulness, answer relevancy,...
Stream LLM Output with Server-Sent Events (SSE)
Stream LLM responses to clients in real-time using Server-Sent Events with FastAPI, OpenAI...