Senior Frontend Engineer, Enterprise AI

Senior Frontend EngineerHandshake AI Enterprise is a new business unit building AI-powered applications for the world's largest companies. We deploy small, expert teams directly into enterprise environments — deeply learning each customer's business, defining where AI can drive real impact, and building and iterating on agents that automate their most critical workflows. We're not a consulting firm and we're not selling software. We're building and deploying AI that measurably changes how enterprises operate.We're looking for a Senior Frontend Engineer who wants to architect the foundation — not just build on top of it.As our first senior frontend hire, you'll define how we build UI across the entire team. That means establishing the component system, design language, and engineering patterns that every engineer who comes after you will rely on. You'll set the technical bar, make the foundational decisions, and build in a way that scales — so others can move fast without sacrificing quality.This is a rare opportunity to own the frontend architecture of a new product from zero, at a company with the data, lab relationships, and momentum to win.Location: San Francisco, CA | 5 days/week in-officeArchitect the frontend foundation for Handshake AI Enterprise — component system, design tokens, patterns, and engineering conventions that the whole team builds onMake foundational technology decisions: framework choices, state management, rendering strategy, performance budgetsBuild shared libraries and abstractions that let other engineers move fast without reinventing the wheel or sacrificing qualityEstablish code standards, review practices, and documentation that scale as the team growsCollaborate closely with Applied AI and Platform engineers to define clean API contracts and integration patternsShip production-grade UI for enterprise customer deployments alongside building the foundationEvolve the architecture over time as the team, product, and customer base scalesDesired Capabilities5–6+ years of frontend engineering experience with a strong architectural track recordDeep expertise in ReactJS and TypeScript — you understand the tradeoffs, not just the syntaxProven experience building and maintaining shared component libraries or design systems used by other engineersStrong opinions on frontend architecture — state management, rendering patterns, performance, accessibility — and the ability to defend and evolve themExperience making technology decisions that others depend on, with an eye toward long-term maintainabilityComfort working in ambiguous, fast-moving environments where the right answer isn't always obviousStrong communication skills — you'll need to align engineers, product, and design on how things get builtExtra CreditExperience building frontend architecture for AI-powered or data-intensive applicationsBackground at a company known for high craft — you've seen what a great design system looks like from the insideHistory of writing technical documentation or guides that helped other engineers ramp quicklyExperience with performance optimization, accessibility standards, or cross-platform rendering at scaleFamiliarity with enterprise deployment environments or security constraintsPerksHandshake delivers benefits that help you feel supported—and thrive at work and in life.The below benefits are for full-time US employees.Ownership: Equity in a fast-growing companyFinancial Wellness: 401(k) match, competitive compensation, financial coachingFamily Support: Paid parental leave, fertility benefits, parental coachingWellbeing: Medical, dental, and vision, mental health support, $500 wellness stipendGrowth: $2,000 learning stipend, ongoing developmentRemote & Office: Internet, commuting, and free lunch/gym in our SF officeTime Off: Flexible PTO, 15 holidays + 2 flex daysConnection: Team outings & referral bonuses Handshake