I've been involved in all stages of development: front-end, back-end and deployment.
I have experience working with AWS serverless architectures: Lambda (TypeScript, NodeJS), AppSync (GraphQL), DynamoDB, EventBridge, Step Functions, Cognito, API Gateway, SNS, SQS, S3, etc.. As IaC I use Serverless Framework and AWS CDK (Cloud Development Kit).
About the front-end I also have experience with React too.