This is a sample case study showing the format. Replace it with a real project.
Problem
The platform grew faster than its architecture: one process served the API, reports and integrations, so every heavy export slowed the whole app. Customers reported outages, and diagnosis took hours because logs were scattered across pods.
Decisions
- A modular NestJS monolith with clear module boundaries instead of premature microservices.
- Heavy operations moved to queues and workers that scale independently.
- Observability: logs in Loki, metrics in Prometheus, dashboards and alerts in Grafana, correlated by request-id.
- CI/CD deployments with automatic rollback on failed health checks.
Outcome
- The platform handled 10× more traffic without a rewrite.
- Mean time to recovery (MTTR) -70%.
- 99.9% uptime the following quarter.