(pnpm workspaces + Turborepo) with a single focused product surface — server, web, admin, and AI apps — built on Postgres rather than Mongo. Backend NestJS with a heavier architectural layer (structured command/event handling, background job queues, real-time features), a functional-programming house style, and a built-in AI/MCP integration. Data PostgreSQL via Prisma (with an added typed-SQL layer), plus OpenSearch, Redis, ClickHouse, and BigQuery for search, caching, and analytics. Frontend Next.js + React with a mix of modern state-management tools, rich editing/visualization components, and built-in chat for messaging. Other surfaces — a dedicated admin tool, an in-house AI app, a React Native mobile app, and serverless functions for background jobs. Infra & tooling — AWS-based deployment with GitHub Actions (including on-demand preview environments), feature flags via LaunchDarkly, and rich observability/tracing tooling; testing and repo tooling lean heavily on AI assistance (including deep Notion integration for pulling project/task context). ProOne is genuinely multi-tenant: every customer configures their own terminology, custom fields, document types, and feature flags, so "it works on my tenant" isn't the same as "it works."