Staff Design Engineer, Go (San Francisco)

About SuperhumanGrammarly is now part of Superhuman, the AI productivity platform on a mission to unlock the superhuman potential in everyone. The Superhuman suite of apps and agents brings AI wherever people work, integrating with over 1 million applications and websites. The company’s products include Grammarly’s writing assistance, Superhuman Docs's collaborative workspaces, Mail’s inbox management, and Go, the proactive AI assistant that understands context and delivers help automatically. Founded in 2009, Superhuman empowers over 40 million people, 50,000 organizations, and 3,000 educational institutions worldwide to eliminate busywork and focus on what matters. Learn more at superhuman.com and about our values here.The OpportunityAs a Staff Design Engineer on Superhuman Go, you sit between design and front-end engineering and own the part of the work where ideas turn into shipped interfaces. You prototype interactions in code to learn how they should behave, then ship those behaviors as production experiences with a high bar for craft, performance, and reliability. You partner closely with product designers, the design system team, and the other engineers to keep raising the craft of the product.Go is an agent for getting work done. It offers proactive assistance wherever someone already works: inside Superhuman products, on the desktop, or anywhere on the web. We build agents that take action on tasks alongside the user. As Superhuman grows into an AI-native productivity suite across Docs, Mail, and more, Go is the layer that turns intent into outcomes.In this role, you will:End-to-end delivery: Take ideas from prototype to shipped feature. Own the front-end work that makes Go feel responsive, intuitive, and trustworthy across desktop, web, and embedded surfaces.Prototyping as a craft: Build interactive prototypes in code to pressure-test interaction models, agent behaviors, streaming responses, and motion. Use these prototypes to settle design questions that mocks cannot answer.Design system and front-end infrastructure: Extend and own the components, primitives, and patterns that the Go design and engineering team use every day. Turn one-off polish into reusable building blocks.Motion and micro-interactions: Find the moments where a small amount of motion changes how the product feels, then dial those moments in. Make agent behavior legible through interaction.AI-native workflow: Use Cursor, Claude Code, and similar tools as core parts of your daily practice. Bring patterns and workflows back to the team so other designers can build with code too.Cross-functional partnership: Partner with product designers, product managers, and front-end engineers from kickoff. Push on the design when the implementation reveals something the mocks missed; push on the implementation when the design deserves more care.Qualifications7+ years building product interfaces, with a portfolio of shipped features you can point to and say I made that. Prototypes are part of the story; production work is the proof.Strong front-end skills in React and TypeScript. Comfortable in a modern web codebase and willing to learn the rest of the stack as needed.A high craft bar across layout, typography, motion, and micro-interactions. You notice the difference between 200ms and 240ms.You prototype in code as a way of thinking, and the prototype carries forward into the shipped work.Hands-on use of AI coding tools like Cursor or Claude Code in your day-to-day. You treat the model as a collaborator and have opinions about how to get good work out of it.Experience designing or building AI-native product surfaces like chat, streaming UI, agent behaviors, and natural language input. You have a clear point of view about what makes them feel good.Low-ego, high-agency working style. You move quickly, share work early, and care more about the product shipping well than about who got credit for which pixel.Willingness to operate at a Staff level: setting the technical and craft bar for design in code at Go, mentoring others, and influencing how the broader team works.Compensation and benefitsSuperhuman offers all team members competitive pay along with a benefits package encompassing the following and more:Excellent health care (including a wide range of medical, dental, vision, mental health, and fertility benefits)Disability and life insurance options401(k) and RRSP matchingPaid parental leave20 days of paid time off per year, 12 days of paid holidays per year, two floating holidays per year, and flexible sick timeGenerous stipends (including those for caregiving, pet care, wellness, your home office, and more)Annual professional development budget and opportunitiesSuperhuman takes a market-based approach to compensation, which means base pay may vary depending on your location. Our US locations are categorized into two compensation zones based on proximity to our hub locations. In Canada, all locations where we support employment are considered “Zone 1”.Base pay may vary considerably depending on job-related knowledge, skills, and experience. The expected salary ranges for this position are outlined below by compensation zone and maybe modified in the future.We encourage you to applyAt Superhuman, we value our differences, and we encourage all to apply—especially those whose identities are traditionally underrepresented in tech organizations. We do not discriminate on the basis of race, religion, color, gender expression or identity, sexual orientation, ancestry, national origin, citizenship, age, marital status, veteran status, disability status, political belief, or any other characteristic protected by law. Superhuman is an equal opportunity employer and a participant in the US federal E-Verify program (US). We also abide by the Employment Equity Act (Canada).Compensation Range: $232K - $348KLocationHub - San FranciscoEmployment TypeFull timeLocation TypeHybridDepartmentEngineering, Product, Design, and MarketingDesignCompensationZone 1$232K – $348K • Offers Equity