The Three Architecture Tiers — Build and Run Cost
Serverless MVP (₹12–25L build / ₹25K–90K/month run): Lambda or Cloud Run, API Gateway, managed Postgres, S3 / GCS, managed auth. Default for teams under 25 engineers with fewer than 10 services. Cold starts are mostly solved in 2026 with provisioned concurrency. Containerised SMB (₹25–55L build / ₹1–3L/month run): ECS Fargate, Cloud Run or AKS managed pools — containers without the operational tax of full Kubernetes. The sweet spot for funded B2B SaaS at ₹5–25Cr ARR. Kubernetes enterprise (₹60L–2Cr build / ₹4–25L/month run): EKS / AKS / GKE, service mesh, GitOps, multi-region active-active. Worth it above ~12 services, 3+ environments, or genuine multi-region regulated workloads.