Principal Software Development Engineer - Frontend

Slate is building safe, reliable, customizable electric vehicles in the USA. The Principal Software Development Engineer - Frontend will lead the definition, architecture, implementation, and delivery of client-side software across web and mobile platforms, while driving frontend quality, user experience, and technical decisions. The role also partners with UX and product teams and mentors engineers.

Responsibilities:

• You lead the definition, design, architecture, implementation, and delivery of Slate's client-side software across web and mobile platforms
• You code and test UI components and client applications, leading code and design reviews with a focus on user experience quality
• You own end-to-end frontend quality, including UI testing, accessibility, cross-platform functional tests, and client-service integration
• You relentlessly simplify complex user interactions, demonstrating significant innovation, creativity, and judgment when solving challenging UX and performance problems
• You partner closely with UX and product teams as a primary technical voice, building and inventing new experiences that put customers first
• You are considered an authority on frontend architecture and web/mobile platform decisions, frequently consulted on performance, scalability, and technology trade-offs
• You drive awareness of how frontend technical decisions impact product quality, customer experience, and business outcomes, balancing technical leadership with strong product judgment
• You assist in the career development of others, actively mentoring engineers on frontend best practices, platform patterns, and helping managers guide the growth of their teams

Requirements:

• You must be able to thrive and succeed in a fast-paced startup environment where your contributions have a direct impact on the company's direction and success and should not be hindered by ambiguity or competing priorities
• Bachelor of Science in Computer Science or equivalent work experience
• 12+ years of professional software development experience with a strong emphasis on client-side and UI engineering
• 10+ years of programming experience in modern languages such as JavaScript, TypeScript, Swift, or Kotlin
• 10+ years of experience in full-stack mobile and web development — Android, iOS, or modern web browsers — with deep expertise in building performant, scalable frontend applications
• 10+ years of experience contributing to frontend architecture and design systems, including component architecture, state management, and cross-platform reliability
• 10+ years of experience with the full software development life cycle, including UI coding standards, component libraries, source control, build pipelines, testing frameworks, and shipping to production
• 7+ years of experience leading frontend design and architecture across new and existing products, with a track record of making systems more maintainable, accessible, and performant at scale
• Applicants must be authorized to work in the United States on a permanent basis. We are unable to offer visa sponsorship at this time