G2

Atharva P.

Cloud BI Engineer

Enterprise (> 1000 emp.)

7/30/2026

"AWS AppSync Makes Scalable GraphQL APIs Fast with Powerful Multi-Source Integration"

4/5

What do you like best about AWS AppSync?

AWS AppSync greatly simplifies building scalable GraphQL APIs by handling query execution, real-time subscriptions, offline synchronization, and data source integration, without requiring developers to build and maintain custom GraphQL servers. I especially appreciate its support for multiple backend sources within a single API, which lets applications pull data from Lambda, DynamoDB, Aurora, OpenSearch, and HTTP endpoints through a single, unified set of GraphQL queries.

The console includes a clean schema editor, resolver management, and query testing tools, so onboarding feels relatively straightforward. Performance is excellent as well, since AppSync resolves only the fields requested by clients, which helps reduce unnecessary network traffic. Although AppSync itself isn’t an AI platform, it can integrate smoothly with Amazon Bedrock and SageMaker via Lambda resolvers, making it possible to expose AI capabilities through GraphQL APIs. Review collected by and hosted on G2.com.

What do you dislike about AWS AppSync?

Resolver mapping templates, especially Apache Velocity Template Language (VTL), have a learning curve and can be difficult to debug for complex business logic. Although JavaScript resolvers have improved the developer experience, maintaining large GraphQL schemas still requires careful planning. Review collected by and hosted on G2.com.

What problems is AWS AppSync solving and how is that benefiting you?

AWS AppSync solved the challenge of exposing multiple backend services through a single, efficient GraphQL API.

For example, a customer portal needed to pull data from DynamoDB, Aurora, Lambda functions, and OpenSearch. Rather than building and maintaining multiple REST APIs, AppSync brought these backend services together behind one GraphQL endpoint. Mobile clients could request only the fields they needed, and GraphQL subscriptions provided real-time updates whenever customer records changed. Overall, this reduced API complexity, improved application performance, and made frontend development simpler. Review collected by and hosted on G2.com.