Software Engineer (Frontend)
About the role
Frontend-focused role building the customization surface and agents for Velt SDK, enabling design-system-driven theming and UI customization inside partner apps, including agent-driven theme generation and headless customization APIs.
Responsibilities
- Make every part of the Velt SDK UI customizable. Themes, design tokens, dark mode, layout overrides, slots, and fully headless pieces for teams that want to build their own UI on top of our logic.
- Build the agents that do the customization for people. They read a customer's design system and app, generate the theme and the overrides, preview the result and ship it. You design the tools, schemas, evals and guardrails that keep the output sane.
- Own the customization API. You decide what the props, tokens and escape hatches are, and how far someone can go before they have to write it themselves.
- Build the review and approval UI itself. Queues, diffs, audit trails, permissions, and the moments where a human steps in.
- Make sure our styles never leak into the host app and the host app never breaks ours.
- Write the docs, examples and playgrounds. If customization is not obvious in the first five minutes, we have failed.
- Build beautiful experiences and features for Velt that scale to millions of users.
Qualifications
- You have written a lot of CSS and are not afraid of it. Theming, design tokens, shadow DOM, style isolation, layout.
- You have built something real with LLMs. Prompting, tool calling, structured output, evals.
- Taste. You can look at a component and tell whether it is merely correct or actually right.
- Strong communication skills, both written and verbal.
- You have shipped at least one library or SDK used by other developers.
- Deep understanding of modern web languages, API and frameworks.
- Relevant experience of at least 1 year building two of these: SDKs, widgets or component libraries that other developers use; scalable component libraries and design systems in JavaScript or TypeScript; headless or composable UI primitives with slots, render props or wrappers; AI tools that generate code or UI.
Skills
Benefits
- Equity participation
- High-impact, fast-paced environment
- Opportunity to shape early engineering practices and culture
- Learning and growth at accelerated pace
About Velt
Add powerful collaboration features to your product ridiculously fast.
Our mission is to make the web more collaborative. We're not just making collaboration faster—we're crafting it to be the best. Today we’re all using online platforms more than ever before - building, researching, learning, connecting etc. And we're not doing it alone. We're doing it together with other people and machines, turning the internet into the world's biggest team. Yet, the web was built for solo voyages. We saw a shift when platforms like Figma and Google Docs brought a multiplayer approach, breaking down walls and inspiring seamless teamwork. At Velt, we're taking it further. We're on a mission to infuse the magic of collaboration into the fabric of the web—one app at a time. We aim to erase the lines between online and offline co-working, crafting an environment where distance is irrelevant, and 'flow' is the norm. Right now, more than half of work hours are spent on coordination and communication—less on creating. With Velt, we're setting out to reverse these figures, reducing time spent on logistical issues by over 90%. Imagine what we can create when we spend less time talking about work and more time doing it! We're building a better web—a web for us, for our team, for everyone. Join us, and let's accelerate the future of web together 🚀 Our Products: - Velt Collaboration SDK (https://velt.dev/): JS SDK to add powerful collaboration experiences to your own product for your end-users. This helps you ship such experiences ridiculously fast, increase user growth and engagement. - Superflow (https://usesuperflow.com/): JS plugin to enable product, marketing and design teams to comment and collaborate directly on their websites. This helps them iterate and ship their products 10x faster. We’re a team of ex-Googlers. We've launched products like Augmented Reality in Google Search & Maps. Come build a better web with us 🚀