Erik Rasmussen
Principal Product Engineer at Attio, Creator of Redux Form & React Final Form
In this episode of Señors @ Scale, host Neciu Dan sits down with Erik Rasmussen — creator of Redux Form and React Final Form, and now Principal Product Engineer at Attio — to talk about building open source at scale, developer experience, and the hidden lessons behind shipping tools other developers rely on.
Main Takeaways from my conversation with Erik:
⚡ CRUD never went away.
Underneath every shiny new tool, software often reduces to inputs, a database, and listing results back out.
🛠 Developer experience is the product.
At Attio, “time-to-first-app” is the north star — if you can’t ship a working button in 5 minutes, the SDK failed.
📚 Docs are for AIs now.
Modern documentation is written as much for LLMs as for humans, which means examples and verbosity matter more than polish.
💡 Bundle size is a hidden tax.
Redux Form bloated from feature creep. React Final Form fixed that by going modular and framework-agnostic.
🔒 Secure runtimes matter.
Third-party code runs in Wasm sandboxes, stripped of cookies and the DOM — protecting users while still letting devs build in React.
🧪 Testing unlocks trust.
From unit tests on pure functions to CLI init tests across npm/yarn/pnpm/bun, Erik shows how deep testing builds confidence in SDKs.
📈 Breaking changes break trust.
Deprecation windows aren’t optional — stability is the contract when thousands depend on your library.
👩💻 Open source is an on-ramp.
Contributing to libraries teaches not just code, but how to take feedback, communicate clearly, and be part of a developer community.
📚 Recommended Read:
- Project Hail Mary by Andy Weir (also the author of The Martian)
🎤 Also in this episode:
- Why React’s free-market chaos beat Angular’s strict framework rules
- Lessons from XState adoption — and when to rip it out
- Why Zod is now essential for runtime type safety
- How Erik went from rejecting his first conference talk to becoming a regular speaker
Episode Length: 62 minutes of open source lessons, developer experience, and frontend scaling stories.
💡 More Recent Takeaways
Señors @ Scale host Neciu Dan sits down with Kadi Kraman, software developer at Expo working on the tools that make React Native development as smooth as possible. Kadi's path started with C++ in a university maths degree, took her through Angular 1, scientific programming for pharmaceutical and defense companies, five and a half years at Formidable, and finally to Expo itself. From the limitations of early React Native to development builds, EAS workflows, fingerprint-based repacks, and the right way to think about over-the-air updates, this is the React Native conversation most web developers never get.
Señors @ Scale host Neciu Dan sits down with Nico Martin — open source ML engineer at Hugging Face working on Transformers.js, and Google Developer Expert in AI and web technology — to go deep on running machine learning models directly in the browser. Nico breaks down architectures vs. weights, quantization, tokenizers, ONNX, WebGPU, and why on-device AI is the right answer for a huge class of problems. He also shares the road from ski instructor and self-taught web developer to landing what he calls his dream job at Hugging Face.
Señors @ Scale host Neciu Dan sits down with Giorgio Polvara, Staff Engineer at Perk (formerly TravelPerk), who joined when the company was 15 people in two flats with a hole knocked through the wall and helped build the frontend foundations that still hold up at unicorn scale. Giorgio covers the multi-year migration from a monolithic frontend to vertical micro-frontends, why their first attempt with single-spa didn't work, how they pulled off a full rebrand behind feature flags without leaking, and the staff engineer mindset of treating every feature as a system improvement.
Señors @ Scale host Neciu Dan sits down with Zack Chapple, CEO and co-founder of Zephyr Cloud, and Nestor, the platform engineer building it, to go deep on module federation, microfrontends, and what it actually takes to go from code to global scale in seconds. They unpack why module federation is Docker for the frontend, how Zephyr composes applications at the edge in 80 milliseconds, and why the real unlock for enterprise teams isn't deployment — it's composition.
📻 Never Miss New Takeaways
Get notified when new episodes drop. Join our community of senior developers learning from real scaling stories.
💬 Share These Takeaways
Want More Insights Like This?
Subscribe to Señors @ Scale and never miss conversations with senior engineers sharing their scaling stories.