Software Engineering

Welcome to rx!

rx is a command-line tool that makes it easy to create, use, and share development environments. It integrates with whatever tools you're currently using and gives you a long-running VM in the cloud that is kept in sync with your local machine.

Check out our blog post on why we built rx .

When a test fails, you should be able to begin investigation with nothing more than the test’s name and its failure messages —no need to add more information and rerun the test.

Effective use of unit test frameworks and assertion libraries (JUnit, Truth, pytest, GoogleTest, etc.) serves two important purposes. Firstly, the more precisely we express... See more

More than reading popular books on Design Patterns, two things that helped me write and structure a large codebase better were

reading a lot of good open source codebases (with similar stack)coding and collaborating a lot on the same codebase

I understand the importance of reading general-purpose design patterns, but they might not suit your... See more

For high-priority tasks , like designing the main user interface content or creating content for a major product launch, you might spend 10–20 hours a week. These tasks need detailed planning and close collaboration with your team.

Medium-priority tasks , such as updating help center articles or creating content for minor feature updates, might take... See more

Pydantic Logfire — Uncomplicated Observability

From the team behind Pydantic, Logfire is an observability platform built on the same belief as our open source library — that the most powerful tools can be easy to use.

What sets Logfire apart:

• Simple and Powerful: Logfire's dashboard is simple relative to the power it provides, ensuring your entire

... See more

Hopefully, at this point, you see where I’m going with this. What I’ve concluded, based on experience, is that positioning your project as an alternative implementation of something is a losing proposition. It doesn’t matter how smart you are. It doesn’t matter how hard you work. The problem is, when you build an alternative implementation, you’ve... See more

Coz: Finding Code that Counts with Causal Profiling

by Charlie Curtsinger and Emery Berger

Coz is a profiler for native code (C/C++/Rust) that unlocks optimization opportunities missed by traditional profilers. Coz employs a novel technique called causal profiling that measures optimization potential. It predicts what the impact of optimizing code... See more

Using feature flags

It's always a good idea to put new features behind a feature flag.

This contributes to a rollout strategy that can surface user feedback in a much more contained and safe environment.

When thinking about how to rollout a new feature to users, first think about your peers. Many of the Resend team members also use Resend on their... See more

Problem : Tight coupling leads to fragility - a change in one microservice breaks connected services.

Low cohesion results in unclear responsibilities.

• Solution : Apply loose coupling and high cohesion. In a loosely coupled system, each component is independent and changes in one will not affect the others. High cohesion means that each component

... See more