# APIs & Service Communication: The Essential Guide

DevFeed: [APIs & Service Communication: The Essential Guide](<https://devfeed.tech/articles/apis-service-communication-the-essential-guide-18022.md>)

Original publisher: [Read original article](<https://blog.levelupcoding.com/p/apis-and-service-communication>)

Author: Nikki Siapno

Published: 2026-09-08T13:03:41Z

Content type: tutorial

Language: en

Sources: [Level Up Coding System Design Newsletter](<https://devfeed.tech/sources/level-up-coding-system-design-newsletter.md>)

Topics: [API](<https://devfeed.tech/topics/api.md>), [Microservice](<https://devfeed.tech/topics/microservice.md>), [GraphQL](<https://devfeed.tech/topics/graphql.md>), [gRPC](<https://devfeed.tech/topics/grpc.md>), [Kafka](<https://devfeed.tech/topics/kafka.md>), [WebSocket](<https://devfeed.tech/topics/websocket.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [apis](<https://devfeed.tech/tags/apis.md>), [graphql](<https://devfeed.tech/tags/graphql.md>), [http](<https://devfeed.tech/tags/http.md>), [kafka](<https://devfeed.tech/tags/kafka.md>), [rest](<https://devfeed.tech/tags/rest.md>)

## AI overview

A tutorial comparing communication patterns for distributed systems. It explains how request-response APIs, event streams, and bidirectional connections affect responsiveness, service coupling, failure propagation, operational complexity, reliability, and scalability, then introduces REST and GraphQL with their main strengths, tradeoffs, and use cases.

## Source excerpt

REST, gRPC, Kafka, WebSockets, Pub/Sub, and more. How do they all fit together?