These days I just use a few languages:

1. Go, when I first saw code I wrote almost a decade ago still compiles and runs in Go, I decided to use Go for everything. There were some initial troubles when I started using it a decade ago, but now it's painless.

2. Haskell, I use it for DSL and state machines.

3. Bash for all deployment scripts and everything.

4. TypeScript, well for the frontend.

Lately, I’ve been using Go and SQLite for nearly everything.

I don't think I’ve any motivation to look at any other language.

I gave up on Java, Python, Ruby, Rust, C++, and C# long ago.

Fun fact:

Same thing for cloud, I just don't use managed cloud services anymore. I only use VMs or dedicated servers. I've found when you want to run a service for decades+, you’ve got to run your own service if you want it not to cost a lot in the long run.

I manage a few MongoDB, PostgreSQL clusters. Most of the apps like email lists marketer (for marketing, sending thousands of email each day) are simple Go app + SQLite using less than 512MB RAM.

Same for SaaS billing, the solution is entirely written in Go and uses Postgres. (I didn’t feel safe here using SQLite for this for a multi-tenant setup.)

Our chat/ticketing system is SQLite + Go. Deployment is easy, just upload Go cross-compiled binary + systemd service file, alloy picks up log and drops it graphana which has all alerts there.

I don't need to worry about "speed" for anything I do in Go, unlike Ruby/Python.

When something has to be correct I define it model it in Haskell as its rich type system helps you write correct code. Though setup is not painless as Go, decent performance.

I write good documentation, deployment instructions right into mono repo. For a small team this is more than enough imho.

No Docker, no Kubernetes, just using simple scripts + graphana + prometheus + Loki and for alloy/nodeexporter. Life couldn't be any simpler than this.

Functional Programmers need to take a look at Zig