Authors: Irina Nazarova, CEO of Evil Martians. I build developer tools and study the market that funds them., and Travis Turner, Tech EditorTopics: Developer Community, Rails, AI, Ruby, LLMsThe SF Ruby Startup Conference is an engineers' conference: meet the people building Ruby open source, scaling...

Authors: Igor Platonov, Backend Engineer, and Travis Turner, Tech EditorTopics: AI, Rails, Open Source, Ruby, LLMsOur Rails AI assistant had read-only SQL access and could still return peer review scores. Learn how we kept open-ended analytics in an in-app AI assistant while making database access h...

Authors: Artur Petrov, Backend Engineer, Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, DX, Performance, RubyRails boot time is a DX metric in the AI age: meet require-profiler, learn to actually read sampling profilers, and see the pit stop that cut a 2...

Authors: Rita Klubochkina, Sr. Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, DX, Agent Experience, LLMs, JamstackHow to publish agent skills so any AI coding agent can find and install them: the .well-known/agent-skills/index.json discovery index, SHA-256 integrity digests, single-fil...

Authors: Alexander Baygeldin, Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, Performance, Ruby, RedisAre you treating your users fairly? They could be stuck in the queue while a greedy user monopolizes resources. And you might not even know it! In this post, you’ll see if it’s time f...

Authors: Nina Torgunakova, Frontend Engineer, and Travis Turner, Tech EditorTopics: Tailwind CSS, CSS, JavaScriptTailwind CSS has become a very popular CSS framework, and it can speed up development. But using it without proper caution can add mayhem to your code. Learn best practices to avoid getti...

Authors: Gleb Stroganov, Product Designer, Varya Nekhina, Account Manager, and Travis Turner, Tech EditorTopics: Case Study, Design, Developer Products, Design for devtools, Product development, Developer marketing, Agentic developmentWe designed and shipped a fresh AppSignal homepage in code, then ...

Authors: Andrey Sitnik, Author of PostCSS and Autoprefixer, Principal Frontend Engineer, and Travis Turner, Tech EditorTopics: Open Source, Developer Community, DX, Performance & scale, JavaScriptHow to protect your npm package from being stolen in a supply chain attack and improve its position in s...

Authors: Rita Klubochkina, Sr. Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, DX, Agent Experience, LLMs, JamstackWe told you to measure. So of course we did it ourselves too: two months of server-side LLM traffic to evilmartians.com. Find out which agents read HTML, which read Markdow...

Authors: Svyatoslav Kryukov, Senior backend engineer, and Travis Turner, Tech EditorTopics: Rails, Open Source, React, JavaScriptInertia is Turbolinks with one twist: render JSON instead of HTML on the second visit. We rebuild the whole protocol on a real Rails app with a 50-line client and a 16-lin...

Authors: Gleb Stroganov, Product Designer, Camila Mirabal, Tech writer, and Travis Turner, Tech EditorTopics: AI, Design, DX, Design engineering, Agent Experience, Design for devtools, Agentic developmentStorybook Workbench is a bundle of Agent Skills that turn Storybook into an audit layer for AI-g...

Authors: Victoria Melnikova, Head of New Business, Host of Dev Propulsion Labs, and Travis Turner, Tech EditorTopics: AI, Design, Developer Community, Design for devtoolsEvil Martians went from attempting to one-shot AI illustrations to a human-in-the-loop workflow with a dedicated illustrator. When...

Authors: Evgeniy Valyaev, Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, DX, LLMsAn MCP server is a product interface for the age of agents, not an AI feature itself. This post presents a framework for deciding between direct API calls, CLI, Skills, and MCP, detailing the architectural...

Authors: Irina Nazarova, CEO, and Travis Turner, Tech EditorTopics: Performance, Real-time, Open Source, Performance & scale, Frontend & real-time, Node.js, WebSocketEvil Martians benchmarked five WebSocket servers for Node.js: Socket.io, uWebSockets.js, and AnyCable (OSS and Pro). How we caught our...

Authors: Camila Mirabal, Tech writer, Arthur Objartel, Product Designer, Anton Senkovskiy, Account Manager, and Travis Turner, Tech EditorTopics: AI, DX, Design, Figma, LLMsCoding without design guidelines can leave teams with an inconsistent UI design and a complex feature development process. Here...

Authors: Gleb Stroganov, Product Designer, Varya Nekhina, Account Manager, and Travis Turner, Tech EditorTopics: Case Study, Developer Products, Product development, Developer marketing, Google AnalyticsA designer and an engineer shipped a production MVP in four weeks on Rails + Inertia. In this pos...

Authors: Andrey Sitnik, Author of PostCSS and Autoprefixer, Principal Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, DX, Open Source, Agent Experience, LLMsMove LLM safeguards out of AGENTS.md: how agent hooks plus nano-staged run linters on changed files only, cut tokens, and tighten ...

Authors: Ivan Chepurin, Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, Developer CommunityAI-assisted code generation is not free. It comes with a hidden cost: burnout. Are we dangerously ignorant to this problem? And how can we cope with it? In this post, we discuss this question.We’r...

Authors: Nina Torgunakova, Frontend Engineer, and Travis Turner, Tech EditorTopics: Developer Products, Next.js, CSS, JavaScript, TypeScriptArabic, Hebrew, and other right-to-left script users often can't type properly in apps that never considered them. The fix is usually two HTML attributes. Here'...

Authors: Pavel Grinchenko, Frontend Engineer, and Travis Turner, Tech EditorTopics: Performance, Open Source, JavaScript, TypeScript, Astro.js, ReactMost marketing sites ship a SPA framework just to toggle a sidebar. Here's how we migrated an Astro site from React and Ark UI to native Web Components...

Authors: Gleb Stroganov, Product Designer, Varya Nekhina, Account Manager, and Travis Turner, Tech EditorTopics: Case Study, Developer Products, Product development, Developer marketing, Google AnalyticsA story of validating product demand on a $2K budget with 128 cold-traffic signups, an A/B winner...

Authors: Irina Nazarova, CEO, and Travis Turner, Tech EditorTopics: AI, Developer CommunityThe agent-led growth playbook: how to make AI agents discover, use, and pay for your developer tool, and defend against the ones you didn't invite. LLM discoverability, agent-first onboarding, agent payments, ...

Authors: Rita Klubochkina, Sr. Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, DX, Agent Experience, LLMs, JamstackMost AI SEO advice is unproven. We tested what ChatGPT, Claude, and Perplexity actually read on our own site. Six LLM visibility techniques that worked, eight that didn't, ...

Authors: Svyatoslav Kryukov, Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, DX, Open Source, Vite, JavaScript, ReactIntroducing rails_vite—a new Vite integration for Rails that works with Propshaft, not against it. Drop it into an existing jsbundling app for instant CSS HMR, or use t...

Authors: Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: Rails, Performance, Open Source, Performance & scale, Platform engineering, Ruby, PostgreSQL, GraphQL, PrometheusWe unveil the gemfile toolbox of the Martian Rails engineer; a universe of Evil Martian gems...

Authors: Camila Mirabal, Tech writer, and Travis Turner, Tech EditorTopics: Case Study, DX, Infrastructure, Ruby on RailsEvil Martians migrated Wallarm's core event pipeline from NATS to Kafka in two months with zero downtime. Learn how we also handle event deduplication and reconstruct business flo...

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.Behind every release of T...

Authors: Irina Nazarova, CEO, and Travis Turner, Tech EditorTopic: Developer CommunityWe analyzed 1,140 early-stage funding rounds in developer tools, cybersecurity, and infrastructure from January 2025 through March 2026. Here are the top VCs and investors writing checks, the metrics that got compa...

Authors: Yuri Mikhin, Frontend Engineer, and Travis Turner, Tech EditorTopics: DX, TypeScript, Node.jsNestJS is code-first by default meaning decorators describe your API, and the spec is generated from code. But decorators don't enforce anything at compile time. This post shows how to flip the flow...

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