I helped HOA Mailers with their AWS infrastructure, back-end systems and front-end software.
The infrastructure is AWS, with Lambda, SAM, RDS and Docker. The back end is Go with a GraphQL API through Hasura over PostgreSQL, and the front end is React and Next.js in TypeScript.
Covering the infrastructure, the back end and the front end as one person is the kind of engagement I like most, because the decisions in each layer are made knowing what they cost in the others.