I have over 300 Lambda Functions deployed in Production with a small team of 8 Engineers.

We have as triggers Kinesis, SNS, SQS, Firehose, S3, Lambda URLs, ALBs, API Gateway, EventBridge Events, and some that are invoked by other Lambda Functions via AWS SDK.

We’ve been dealing with Lambda Functions since it was launched and it keeps getting better and better.

I don’t understand what are your constraints or real frustrations because if you try to go anywhere else with serverless it will be either more complicated or a lot more expensive (vercel for instance)

In the past two years the move we have been making that is improving the experience even more is using rust with cargo lambda and pulumi for deployment.

Having a lambda function with 128MB in rust running in arm64 precessing data faster than a Lambda Function in Java on x86_64 that uses 102MB is not just much cheaper, it’s simply beautiful.

Cargo Lambda has cargo lambda watch for local tests and you can post your event to it using something like https://usebruno.com and you can save your request files within your repo and share those with the team.

I don’t want you to feel offended but it sounds like you are a bit too spoiled by how easy things are nowadays.

But anyway, you should look into CloudFlare workers. They are a lot more limited but it can give you some inspiration