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)
Scale Concurrent Applications with Java Virtual Threads
Scale Java applications with virtual threads from Project Loom. Use Thread.ofVirtual,...
Concurrent Async Tasks with asyncio.gather and Task Groups
Execute multiple async operations concurrently in Python using asyncio.gather, asyncio.TaskGroup,...
Parallelize CPU and I/O Work with ThreadPoolExecutor
Use Python's ThreadPoolExecutor for parallel I/O operations, thread-safe result collection, Future...
Build Async Systems with Rust Tokio Runtime
Build async systems in Rust using the Tokio runtime with tasks, channels, select, synchronization...
Database Connection Pooling
Configure and tune database connection pools to maximize throughput while preventing connection...
Implement Event Sourcing with CQRS in Python
Build an event-sourced system with CQRS separation using Python, event store persistence,...
Kafka Consumer Groups with Python for Scalable Streaming
Create Kafka consumer groups in Python with partition assignment, offset management, commit...
Consume Kafka Topics with Spring Boot Stream Listeners
Build Kafka consumers in Spring Boot using @KafkaListener annotations, concurrent consumers, error...
Implement the Transactional Outbox Pattern for Reliable
Use the transactional outbox pattern to reliably publish domain events alongside database changes,...
Configure Dead-Letter Queues in RabbitMQ for Failed Messages
Set up dead-letter queues and exchanges in RabbitMQ with TTL expiry, max length limits,...
Implement Redis Pub/Sub Messaging in Python
Build real-time pub/sub messaging with Redis and Python including pattern subscriptions, message...
Reduce AWS Lambda Cold Start with Provisioned Concurrency
Minimize Lambda cold start latency using provisioned concurrency, ARM64 Graviton, lighter...
Package Python Dependencies for AWS Lambda with Layers
Package Python dependencies for AWS Lambda using Lambda Layers, Docker builds for native...
Build HTTP-Triggered Azure Functions with Python
Create HTTP-triggered Azure Functions in Python with binding configuration, async handlers,...
Deploy HTTP Cloud Functions on Google Cloud with Node.js
Create and deploy HTTP-triggered Cloud Functions on Google Cloud with Node.js, Express integration,...
Secure API Gateway with Custom Lambda Authorizers
Implement custom Lambda authorizers for API Gateway with JWT validation, IAM policy generation, and...
Design a DynamoDB Single-Table Schema for Serverless Apps
Design a DynamoDB single-table schema with composite keys, GSI patterns, and access patterns for...
Event-Driven Lambda with SQS Triggers and Batch Processing
Process SQS messages with Lambda using batch windows, partial batch responses, error handling, and...
Orchestrate Serverless Workflows with AWS Step Functions
Build state machine workflows with AWS Step Functions using sequential, parallel, and map states...
Agent Tool Selection Pattern
Dynamically select which tools an LLM agent can use based on the task context. Reduce token usage...
Embedding Cache Pattern
Cache LLM embeddings to reduce API calls and cost. Store embeddings with a content hash key and...
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...