Staff Designer, Rapid Prototyping

Mozilla·Remote CanadaRemote

In short

→Diseñador de alto nivel que crea prototipos funcionales en código para un cliente de IA open-source.
→Trabaja directamente en el código, combinando diseño, ingeniería y herramientas de IA para definir experiencias de producto enterprise.
→Destaca por transformar ideas ambiguas en interacciones reales, con enfoque en confianza, control de datos y reutilización.

Fluency in English is required for collaboration across global teams.

In ~1 minute you get: who interviews you, the likely questions answered from your CV, and your CV tailored to this job. Free, no card.

🎧Land the interview? Bring the copilot. Our free extension listens to the live interview and flashes 3-4-word anchors from your resume and prep — glance, connect, talk. Get the extension →

What they ask for

✓Experiencia comprobada en diseño de productos digitales con enfoque en prototipado funcional.
✓Capacidad para trabajar directamente en el código (no solo en artefactos visuales).
✓Conocimiento en interacciones de IA: chat, búsqueda, automatización de flujos, recuperación de conocimiento.
✓Habilidades para operar en ambigüedad y priorizar entre experimentos y producción.
✓Compromiso con el open source, privacidad y control de datos por parte del usuario.
✓Experiencia colaborando con equipos técnicos y productivos en entornos distribuidos.

Don't tick every box? That's normal — your free dossier shows your gaps and how to cover them in the interview.

ThunderboltAI-assisted development toolsprototyping in codeinteraction patternsenterprise UXopen-sourceUI/UX designproduct experimentationuser workflowscross-platform design

Who should you write to at Mozilla?

Your free dossier identifies the people who'd interview you — their background, what they value, and how to reach out so you stand out before applying.

Why Thunderbird? Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At MZLA, the team behind Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data. We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first. We are a small but growing company of 60+ people distributed across seven countries. As Thunderbird evolves beyond a single desktop application, we are expanding across desktop, mobile, paid services, and new product experiences that help people and organizations work more effectively without giving up control to big tech ecosystems. Our revenue model combines user donations, which help keep Thunderbird’s apps freely available, with paid services that cover the costs of hosted offerings while supporting long-term sustainability and continued innovation. A note about MZLA and Mozilla: MZLA Technologies Corporation is the nonprofit-owned company behind Thunderbird and part of the Mozilla family. MZLA is separate from Mozilla Corporation and has its own compensation programs, benefits, and employment policies. To learn more, visit www.thunderbird.net The opportunity Thunderbird is expanding beyond email with Thunderbolt, an open-source AI client designed for organizations that need more control over their data, infrastructure, and model choices. We’re looking for a Staff Designer to help shape the product experience for Thunderbolt as it moves from early product development into enterprise use cases. This role sits at the intersection of product design, front-end engineering, prototyping, and AI-assisted product development. You’ll turn early product ideas, user needs, partner feedback, and workflow concepts into working prototypes and production-ready user experiences. This is not a role focused only on mockups or design artifacts. You’ll work directly in the codebase, use AI-assisted development tools thoughtfully, and help define the interaction patterns that make Thunderbolt intuitive, useful, trustworthy, and enterprise-ready. You should be comfortable operating independently in ambiguity, moving quickly from concept to prototype, distinguishing between experiments and production-ready work, and creating reusable product and interaction patterns that help the broader team move faster. What you’ll do • Build functional prototypes and product experiments directly in the Thunderbolt codebase. • Translate ambiguous product ideas, user workflows, partner feedback, and enterprise needs into clear, usable product experiences. • Help define interaction patterns for AI-powered chat, search, research, workflow automation, knowledge retrieval, and enterprise administration. • Use AI-assisted development tools to accelerate prototyping and implementation while maintaining strong judgment around qual

Looking for something similar?

Leave your email and we'll alert you when matching jobs appear.

Don't apply unprepared

We research who's interviewing you, tailor your CV and rehearse you live — first one free.