Authors: Vladimir Dementyev, Principal Backend Engineer, and Travis Turner, Tech EditorTopics: AI, Rails, DX, LLM benchmarking, Agentic development, LLMsTips and tricks on writing robust evals for coding agents that test apps whose code we've never seen: different UI/UX contract strategies, UI mutat...

Authors: Kirill Yakovenko, Account Manager, Valentin Kiselev, Backend Engineer, and Travis Turner, Tech EditorTopics: Developer Products, Product development, Ruby on Rails, RubyMRR is easy to calculate and easy to get subtly wrong. Here's how to normalize Stripe subscriptions, classify every moveme...

Authors: Yaroslav Kurbatov, Backend Engineer, and Travis Turner, Tech EditorTopics: DX, Rails, PostgreSQL, Ruby, Python, Continuous IntegrationPostgreSQL does not guarantee row order without ORDER BY. Use Rails 8.2 or pg_disorder to shuffle unordered SELECT results and expose hidden order dependenci...

Authors: Camila Mirabal, Tech writer, and Travis Turner, Tech EditorTopics: Developer Community, Rails, AIRegular SF Ruby Conference tickets are $450 through September 30. Meet Ruby friends, play The Pier, join small-group conversations, and explore the 2026 program in San Francisco.Not a single per...

Authors: Anton Lovchikov, Head of Design, Yuri Mandrikov, Frontend Engineer, and Travis Turner, Tech EditorTopics: AI, DX, Agentic developmentAI has made implementing and enforcing design systems cheaper than ever. At the cost of speed, this falls through the cracks. But agentic development makes go...

Authors: Albert Pazderin, Backend Engineer, and Travis Turner, Tech EditorTopics: Open Source, Rails, AI, Agent Experience, Ruby on Rails consultingIntroducing Rails Hyperdrive: a development-only Rails engine that gives AI coding agents live answers from your booted app and lets any gem in your bun...

Author: Irina Nazarova, CEO of Evil Martians. I build developer tools and study the market that funds them.Topics: AI, Developer Community, DX, Agentic developmentAgentic speed turned all of us into super-ICs and broke our ability to collaborate. Two types of work that both produce code, and three r...

Authors: Rita Klubochkina, Sr. Frontend Engineer, Victoria Melnikova, Head of New Business, Host of Dev Propulsion Labs, and Travis Turner, Tech EditorTopics: DX, AI, JavaScript, TypeScript, React367 posts, four years on Gatsby, and no dedicated team: here's how we moved evilmartians.com to Astro in...

Author: Irina Nazarova, CEO of Evil Martians. I build developer tools and study the market that funds them.Topics: Case Study, Rails, AI, Ruby, SidekiqGusto runs payroll for 500,000+ businesses on one of the largest Rails monoliths anywhere. Why a team this strong hired Evil Martians for Sidekiq at ...

Authors: Yuri Mikhin, Frontend Engineer, and Travis Turner, Tech EditorTopics: DX, AI, Agent Experience, TypeScript, React, Agentic development, LLMs, Continuous IntegrationTen checks that catch what AI-written frontend code hides: contract codegen, boundary linting, mutation testing, and dead-code ...

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: 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, LLMsSF Ruby is an engineers' conference: meet the people building Ruby open source, scaling Rails in production, a...

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'...