Frontend: React + React Query. Backend: * Java Spring if it looks like monolith. * Golang if it looks like microservice architecture. Postgres for data. S3

Frontend: React + React Query. Backend: * Java Spring if it looks like monolith. * Golang if it looks like microservice architecture. Postgres for data. S3 for blobs. RabbitMQ for queues. Kubernetes for infrastructure. Managed or self-hosted, doesn't matter. One 16GB VPS is good enough for start and can be scaled later. That's my approach to any architecture today.