How do you measure product-market fit for a developer tool? A PMF scoring model from Evil Martians—a product development consultancy for developer tools startups—built on data from 37 devtools companies across AI, infrastructure, and cybersecurity. Five metrics, real benchmarks, and a dual score that tells you whether to invest in product or go-to-market.

Nothing could make me switch from Keynote to web-based slides. Then, I did! And as a WebSocket geek, I realized it opens up new opportunities! Here's my contribution to making your web presentations beautifully interactive.

Evil Martians is a developer tools consultancy. Founded in 2006, we work with about 40 early-stage startups a year, mostly seed to Series B. We helped bolt.new scale from zero to $40M+ ARR in 5 months. Teleport and Tines reached unicorn status with Martians on their teams.

Wire your OpenAPI contract into a Node.js Fastify backend with auto-generated routes, typed handlers, and request validation—no manual route definitions, no type drift, no integration surprises.

A deep dive extending Flipper in Rails: friendly actor IDs, team-wide flags, percentage rollouts, analytics events, and admin auditing.

Konstantin Vinogradov, an open source and infra VC investor, and his co-founders are building the first permanent funding model for critical open source infrastructure. We dive into why OSE stands a chance at battling the Nebraska problem, and how Evil Martians contributed as a pro-bono donor.

Transform your React development with contract-first APIs. Generate TypeScript types, build type-safe clients, and develop with mocks while backend implements—no more waiting, no more integration chaos.

An exhaustive and documented Docker configuration for developing Ruby and Rails applications

Write and ship modern custom RuboCop cops in 2026: learn the new plugin system, requires_gem API, InternalAffairs best practices, safe autocorrection nuances, and design trade-offs for building robust, future-proof lint rules.

With 20+ years and millions of downloads, PostCSS creator Andrey Sitnik shares his guide on how to make your open source project popular.

Vibe coding can speed up app development, but it can also quietly introduce serious security flaws. Here are the four most common risks and how to avoid them.

An intermediate report for Ruby Association Grant on TutorialKit.rb, a toolkit for building interactive Ruby and Rails tutorials that run entirely in the browser using WebAssembly and WebContainers.

Evil Martians make the impossible possible: launching a new Aptos Network website in just one month!

Research-backed insights into what AI-assisted developers can actually deliver: when productivity improves, when it doesn’t, and how setting realistic expectations means best quality results.

AI can generate a full dashboard in an afternoon. But speed doesn't eliminate design decisions—and building the wrong thing faster is an expensive mistake. Here's what design work looks like across four stages, from framing problems to learning after launch.

Build optimistic UI in Rails with Inertia by updating props before requests complete. Learn the replaceProp pattern, automatic reconciliation, rollback behavior, and history caveats using a kanban board example.

Prefer SVG over PNG, trust browsers to downscale, drop obscure formats—the ultimate, exhaustive guide to favicons for modern web. Includes steps for static HTML and Webpack.

Read how to accurately detect Safari and iOS versions using WebKit feature checks, behavioral tests, and selective UA hints to gate features safely and avoid breaking UX.

I spent the year in San Francisco, having face-to-face conversations with founders you already follow. Here are the top pieces of advice to take into 2026.

Developers don’t need more tools—they need fewer, higher-quality ones. This piece distills research and field evidence into six principles for faster, calmer, trustworthy devtools in 2026.