Backend
PythonNode.jsFastAPIFastifyExpressNext.jsJWT authStripeResend
AI / LLM
CrewAIClaudeGeminiOpenRouterOllamaFAISSRAGMulti-model routingAgent architectureContext compactionSemantic memoryPrompt engineering
Database
SQLitePostgreSQLMongoDBRedisWAL modeJSONL persistence
Real-time / Systems
WebSocketsSSH proxyxterm.jsPTY emulationssh2
Infrastructure
DockerNginxPM2DuckDNSSelf-hosted VPSLet's Encrypt
Product
Freemium meteringStripe paywallsGTM strategyAI cost optimizationOps documentation