Principal Mobile Engineer, Cash Line

Upstart

2d•$195,300 - $270,400•Remote

About The Position

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.

Requirements

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.

Nice To Haves

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.

Responsibilities

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

Competitive compensation, including base pay, bonus opportunities, and annual equity grants that vest quarterly
Retirement benefits to help you plan for the future, including a 401(k) or Group Retirement Savings Plan with a company match of $2 for every $1 contributed, up to $15,000 annually (USD in the US, CAD in Canada)
Employee Stock Purchase Plan (ESPP) with discounted stock purchase options for eligible employees (US only)
Comprehensive health coverage designed to support you and your family, including medical, dental, vision, and wellness resources for US and supplemental health coverage for Canada.
Health Savings Account contributions from Upstart for eligible plans (US only)
Income protection benefits, including life insurance and disability coverage for added financial security
Paid time off, sick leave, and company holidays, in line with local requirements
Paid family and parental leave to support caregiving and major life moments (duration varies by country)
Family-centered benefits to support fertility, parenthood, and caregiving needs
Employee Assistance Program (EAP) offering mental health support and life-centered resources
Financial wellness resources, including access to financial planning tools and a financial concierge service (US Only)
Annual wellness allowance to support your physical and emotional well-being and personal development, based on what matters most to you
Annual productivity allowance to invest in relevant tools and resources you need to do your best work, no matter where you work from
Connection and community through team events, all-company updates, and employee resource groups (ERGs)
Onsite perks, including catered lunches and fully stocked micro-kitchens when working from one of our offices in the Bay Area, Austin, Columbus, and New York City (opening Summer 2026!)