Mathias Paulenko

Template for estimating serverless costs per workload: invocation-based pricing, memory-duration calculation, data transfer, API Gateway,...

Pre-deploy and post-deploy checklist for serverless functions (AWS Lambda, Azure Functions, GCP Cloud Functions): IAM roles, environment...

Security hardening checklist for serverless functions: IAM least privilege, secret management, input validation, dependency scanning,...

Build production AI agents. Covers agent architectures, tool use, planning, memory, multi-agent systems, ReAct patterns, function calling,...

Run LangChain in production. Covers chains, agents, memory, tools, LCEL, streaming, callbacks, RAG integration, evaluation, and deployment...

Build production LLM applications end-to-end. Covers API layers, prompt management, streaming, caching, guardrails, observability,...

Optimize LLM costs in production. Covers model routing, prompt compression, caching, batch API, token management, semantic caching, prompt...

Evaluate LLM applications in production. Covers RAGAS, LLM-as-judge, human evaluation, A/B testing, hallucination detection, toxicity...

Secure LLM applications in production. Covers prompt injection, jailbreaks, data leakage, OWASP Top 10 for LLMs, input validation, output...

Deploy LLMs locally and on-premise. Covers Ollama, vLLM, llama.cpp, LM Studio, model quantization, GPU requirements, serving with API...

Master the OpenAI API in production. Covers chat completions, streaming, function calling, structured outputs, embeddings, fine-tuning,...

Build production RAG systems. Covers chunking strategies, embedding models, vector stores, retrieval optimization, reranking, hybrid...

Compare and use vector databases in production. Covers Pinecone, Weaviate, Chroma, pgvector, Milvus, and Qdrant. Includes indexing,...

Cache GraphQL responses at every layer: CDN, gateway, DataLoader, persisted queries, and client-side. Covers cache keys, invalidation, HTTP...

Run federated GraphQL in production with confidence. Covers subgraph composition, gateway deployment, entity resolution, schema...

Design GraphQL schemas for evolution, performance, and maintainability. Covers type design, connections, mutations, error handling,...

Secure GraphQL APIs against introspection leaks, query depth attacks, cost-based DoS, batching abuse, and injection. Covers auth patterns,...

Test GraphQL APIs at every layer: unit tests for resolvers, integration tests for schema, E2E tests for operations. Covers mocking,...

Implement in-memory, distributed, and hybrid caches at the application layer. Covers LRU caches, TTL caches, multi-tier strategies, cache...

Master cache invalidation strategies: TTL expiration, event-driven invalidation, versioned keys, tag-based purging, and write-through...

Design CDN caching for web applications and APIs. Covers edge caching, cache keys, cache headers, invalidation strategies, surrogate keys,...

Master Redis caching with cache-aside, read-through, write-through, write-behind, and refresh-ahead patterns. Covers eviction policies, TTL...

Master Go concurrency in production. Covers goroutines, channels, context, select, sync primitives, worker pools, pipelines,...

Master Java concurrency in production. Covers threads, locks, CompletableFuture, virtual threads, executors, concurrent collections, memory...