Stack

Production-grade tools I work with. Grouped by layer. Not everything is daily — but everything below has shipped real code, not tutorial output.

LLM & AI

OpenAI APIAnthropic Claude APIRAGLangChainFAISSModel fine-tuningEmbeddings & vector databasesSemantic searchAgent architecturesTool callingMCP serversMulti-step agent loopsLLM evaluationPrompt regression testingLLM observabilityPrompt-injection testingInference cost optimizationClaude Code · Codex · Cursor

AI engineering practices

Golden-set evalsRelease gates on quality metricsHallucination & groundedness scoringProvider / model fallbackPrompt versioningResponse cachingRequest & pipeline tracing

Backend

PythonNode.jsNest.jsExpressFastAPIFlaskDjango / DRFSQLAlchemyCelery

Frontend

TypeScriptReactRedux ToolkitReact QueryNext.jsVueJinja2Tailwind CSS

Data

PostgreSQLMongoDBRedisMySQLGraphQL (Apollo)RESTWebSocket

Infrastructure

AWS (EC2, S3, Lambda, RDS)Yandex CloudDockerKubernetesNginxLinux (Ubuntu)systemdLet's Encrypt

CI/CD & Observability

GitLab CIGitHub ActionsJenkinsPrometheusGrafanaELK StackPagerDuty

Payments & Auth

YooKassaStripe (integrations)OAuth 2.0JWTFernet encryption2FA

Testing

pytestPlaywrightCypressSeleniumJest

Bots & Integrations

Telegram Bot APIpython-telegram-botQuickBooksStripeGoogle MapsDocuSignInteractive Brokers