How do you implement gRPC streaming including server-side, client-side, and bidirectional streaming in NestJS?

0-2 years experience

1. 1We need a simple NestJS microservice that streams a list of numbers to a client using server‑side streaming. How would you set up the protobuf definition and the NestJS controller to achieve this?
2. 2If a client calls a client‑side streaming RPC to upload a series of log entries, what NestJS decorators and method signature would you use to receive the stream?
3. 3What happens if the client disconnects in the middle of a bidirectional stream? How does NestJS handle the termination?

2-5 years experience

1. 1You added a bidirectional streaming endpoint to an existing NestJS service, but the client reports that it never receives responses after sending the first message. What are common pitfalls that could cause this, and how would you debug it?
2. 2When implementing server‑side streaming for a large file download, you notice high memory usage. What changes can you make in NestJS to stream the file efficiently?
3. 3Explain how you would add back‑pressure handling to a client‑side streaming RPC in NestJS.

5-8 years experience

1. 1Design a scalable architecture for a NestJS gateway that aggregates data from multiple downstream gRPC services using bidirectional streams. What patterns would you use to manage flow control and fault tolerance?
2. 2How would you instrument NestJS gRPC streaming endpoints to monitor latency and error rates in production, ensuring minimal impact on throughput?
3. 3If you need to support both HTTP/1.1 and gRPC streaming over the same NestJS server, what configuration and routing considerations arise?

8+ years experience

1. 1Our organization is migrating from a legacy REST API to a gRPC streaming architecture built on NestJS. What strategy would you propose to phase the migration while keeping backward compatibility and minimizing downtime?
2. 2Across multiple teams, you need to define a shared protobuf contract for streaming data that evolves over time. How would you manage versioning and compatibility in NestJS services?
3. 3Discuss the trade‑offs of using NestJS's built‑in gRPC transport versus a custom low‑level implementation for high‑throughput bidirectional streams in a multi‑region deployment.