Authors: Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: Performance, Rails, Open Source, Performance & scaleLearn what's new in the world of slow tests and how TestProf continues to help Rails teams to keep CI build times under control.Every release of TestProf...

Author: Irina Nazarova, CEOTopics: Developer Community, Devtools startup advisoryHow 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, infra...

Author: Irina Nazarova, CEOTopics: Developer Community, Devtools startup advisoryHow 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, infra...

Authors: Irina Nazarova, CEO, and Travis Turner, Tech EditorTopics: Open Source, Real-time, DX, WebSocket, JavaScriptNothing 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 we...

Authors: Victoria Melnikova, Head of New Business, and Travis Turner, Tech EditorTopics: Case Study, Developer CommunityEvil 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 $...

Authors: Yuri Mikhin, Frontend Engineer, and Travis Turner, Tech EditorTopics: DX, TypeScript, Node.jsWire 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.Back...

Authors: Andrey Novikov, Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, RubyA deep dive extending Flipper in Rails: friendly actor IDs, team-wide flags, percentage rollouts, analytics events, and admin auditing.Our client StackBlitz already had an in-house solution for feature flags ...

Authors: Victoria Melnikova, Head of New Business, and Travis Turner, Tech EditorTopics: Developer Products, Open Source, Developer Community, Case StudyKonstantin Vinogradov, an open source and infra VC investor, and his co-founders are building the first permanent funding model for critical open s...

Authors: Yuri Mikhin, Frontend Engineer, and Travis Turner, Tech EditorTopics: React, TypeScriptTransform 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.Mo...

Authors: Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: Performance, Rails, DX, Performance & scalability, Ruby, Docker, PostgreSQL, Node.jsAn exhaustive and documented Docker configuration for developing Ruby and Rails applicationsThis post introduces the Dock...

Authors: Yaroslav Kurbatov, Backend Engineer, and Travis Turner, Tech EditorTopics: DX, RubyWrite 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...

Authors: Andrey Sitnik, Author of PostCSS and Autoprefixer, Principal Frontend Engineer, and Travis Turner, Tech EditorTopics: Open Source, Developer CommunityWith 20+ years and millions of downloads, PostCSS creator Andrey Sitnik shares his guide on how to make your open source project popular.I've...

Authors: Nina Torgunakova, Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, Vibe coding, JavaScriptVibe 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.Few things let us build full-fl...

Authors: Albert Pazderin, Backend Engineer, Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: Open Source, Rails, Local-first, DX, WebAssembly, Ruby, JavaScriptAn intermediate report for Ruby Association Grant on TutorialKit.rb, a toolkit for building interactive ...

Authors: Ivan Chepurin, Frontend Engineer, and Travis Turner, Tech EditorTopics: Case Study, DX, AI, Astro.js, React, Tailwind CSSEvil Martians make the impossible possible: launching a new Aptos Network website in just one month!Evil Martians have proudly collaborated with our client Aptos for 3+ y...

Authors: Ivan Eltsov, Frontend Engineer, and Travis Turner, Tech EditorTopic: AIResearch-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 has quickly reshaped softw...

Authors: Yaroslav Lozhkin, Product Designer, and Travis Turner, Tech EditorTopics: AI, Design for devtoolsAI 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 acr...

Authors: Svyatoslav Kryukov, Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, React, JavaScriptBuild 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 k...

Author: Andrey Sitnik, Author of PostCSS and Autoprefixer, Principal Frontend EngineerTopic: CSSPrefer 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.It's time to rethink how we coo...

Authors: Evgeniy Valyaev, Frontend Engineer, and Travis Turner, Tech EditorTopics: iOS, JavaScript, CSS, TypeScriptRead 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.Why is accurate...

Authors: Victoria Melnikova, Head of New Business, and Travis Turner, Tech EditorTopics: Developer Products, AI, Devtools startup advisoryI 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.I spent...

Authors: Evgeniy Valyaev, Frontend Engineer, and Travis Turner, Tech EditorTopics: Developer Products, AI, DX, Performance, Design, JavaScript, Accessibility, LLMsDevelopers don’t need more tools—they need fewer, higher-quality ones. This piece distills research and field evidence into six principle...

Authors: Svyatoslav Kryukov, Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, React, JavaScript, Tailwind CSSWe want to make Inertia.js more popular within the Rails community, so we've started a project to provide both Rails-specific community docs and a set of tools for simply integr...

Authors: Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: Real-time, AI, Open Source, Real-time features, Ruby on Rails, Hotwire, WebSocketReal-time LLM streaming sounds simple—until it isn’t. A Rails-focused look at hidden pitfalls, AnyCable’s fixes, and the fut...