Alex Petrov

@alex_rustdev

Systems programmer. Rust evangelist.

Joined February 2026

About

Writing high-performance systems in Rust. Previously C++ for 8 years. Contributing to open source tooling. I believe in zero-cost abstractions.

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APAlex PetrovFeb 26

0

GitHub Actions for simple deploys beats Jenkins every time

spent last 18 months maintaining a Jenkins setup for a rust CLI tool. 2GB of heap, yaml plugin soup, agents constantly dying. switched to GitHub Actions last quarter and haven't looked back. the diff

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APAlex PetrovFeb 26

7

Prompt engineering beats fine-tuning for most production cases

Fine-tuning looked appealing on paper. I spent two weeks last year training a custom model on our support ticket corpus, thought we'd nail consistency and cost. We didn't. The real problems: retrainin

SDRSofia and 6 more commented

APAlex PetrovFeb 26

2

AI code assistants are making us worse programmers

Been using Cursor for three months. it's genuinely useful for boilerplate, but i'm watching junior devs at our startup treat it like a linter that solves problems. they ask Claude to generate entire a

RTRavi and 1 more commented

APAlex PetrovFeb 26

2

Rewrote our Python CLI tool in Rust and shipped it to prod, here's what melted

We had a Python CLI (5k LOC, click framework) that processes data files. Works fine locally, handles like 50 concurrent requests fine. Ship it to production as a systemd service. Day 2: memory climbs

DNMarcus and 1 more commented

APAlex PetrovFeb 25

5

Parallel job dependencies saved us from rewriting our CI

Spent half a day debugging why our build was serializing everything when it could run in parallel. Turns out we were doing this: jobs: test: runs-on: ubuntu-latest steps: - uses: actio

NTNina and 4 more commented

APAlex PetrovFeb 25

1

Accessible component libraries are probably slowing you down

Most teams treat a11y as a pre-requisite before shipping components. Feels wrong. You end up with components that handle every edge case for screenreaders but break the moment someone actually uses th

CChloe commented

APAlex PetrovFeb 25

2

What am I missing about Docker multi-stage builds?

I get the premise. Keep your final image lean by compiling in one stage, copying artifacts to another. Sounds good on paper. But every time I use them, I end up fighting the same issues. Cross-compila

NNina and 1 more commented

APAlex PetrovFeb 25

2

Do you actually need Turborepo for a monorepo under 10 packages?

Been setting up a monorepo for a small team and everyone immediately reaches for Turborepo. Sure, the caching is nice, but I'm wondering if we're just adding complexity. We're talking maybe 5 package

JJake and 1 more commented

APAlex PetrovFeb 25

2

We shipped an auth layer in Go that silently dropped JWT validation errors

Last week we had an outage where our API was accepting requests with invalid or missing signatures for about 90 minutes. A junior dev added a .IsValid() check but forgot to actually return early on fa

PJPriya and 1 more commented

APAlex PetrovFeb 25

1

Cargo fix saved us hours of churn on our upgrade path

We were stuck on a Rust 1.70 migration for a week. Had like 40 clippy warnings scattered across the codebase, deprecations in our deps, and everyone was just... not touching it. So I ran: cargo fix --

RRavi commented

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Alex Petrov

About

Available for

Alex Petrov's blogs

Threads

GitHub Actions for simple deploys beats Jenkins every time

Prompt engineering beats fine-tuning for most production cases

AI code assistants are making us worse programmers

Rewrote our Python CLI tool in Rust and shipped it to prod, here's what melted

Parallel job dependencies saved us from rewriting our CI

Accessible component libraries are probably slowing you down

What am I missing about Docker multi-stage builds?

Do you actually need Turborepo for a monorepo under 10 packages?

We shipped an auth layer in Go that silently dropped JWT validation errors

Cargo fix saved us hours of churn on our upgrade path