Principal Mobile Engineer

Who you are

• 8+ years of software engineering experience, including substantial experience building and shipping mobile applications with React Native and TypeScript
• Strong native Android depth in Kotlin and/or Java, with experience shipping or launching native Android applications in production
• Proven track record leading cross-team mobile initiatives, platform migrations, or new mobile product launches in production environments
• Experience shipping consumer-facing mobile products at scale with strong attention to performance, reliability, and user experience
• Demonstrated technical leadership as a senior individual contributor, including architecture ownership, mentorship, and influence across teams

What the job involves

• Upstart’s Cash Line team builds and scales the mobile experiences that support our Cash Line products
• This role will strengthen the team’s mobile foundation across its codebase and help drive a newly approved Android app launch on an aggressive timeline this year
• The work is highly cross-functional and high-visibility, with direct impact on product strategy, engineering execution, and the customer experience
• As the Principal Mobile Engineer on the Cash Line team, you will be the senior technical owner for the team’s mobile work
• You’ll operate primarily as a mobile generalist and React Native specialist, elevating the team’s mobile codebase while bringing the native Android depth needed to lead the Android launch this year
• After launch, you’ll continue as the team’s mobile specialist, shaping long-term mobile architecture and quality across React Native and native Android surfaces
• This is a high-impact individual contributor role with meaningful technical leadership, cross-team influence, and mentorship responsibility
• Serve as the primary mobile engineer and React Native specialist for the Cash Line team, raising the quality, scalability, and velocity of the team’s mobile codebase
• Lead Android development for the team and help deliver against Upstart’s approved Android launch plan this year, translating ambitious business goals into pragmatic technical milestones and execution plans
• Set technical direction for the team’s mobile architecture, evolving a strong foundation across React Native and native Android surfaces
• Partner closely with product, design, and engineering stakeholders to translate roadmap priorities into durable mobile solutions
• Raise the bar for engineering excellence through technical leadership, design reviews, mentorship, and pragmatic execution in ambiguous, high-visibility problem spaces
• After launch, continue as the team’s mobile specialist, bringing broad React Native fluency alongside deep Android expertise to support the full Cash Line mobile stack

Benefits

• Comprehensive health plans
• 401k Plan
• Annual wellness reimbursement
• Disability insurance
• Generous vacation policy
• Flexible time off
• Parental leave
• Family forming benefits through Carrot
• Technology equipment budget
• Personal development budget
• Various clubs and extracurricular activities
• Catered lunches
• Fully stocked micro-kitchen