Principal Mobile Software Engineer

Upstart

Senior Mobile Software Engineer at Upstart, designing and building scalable mobile applications. Collaborating with cross-functional teams to deliver exceptional user experiences.

Posted 5/7/2026full-timeRemote • 🇺🇸 United StatesLead💰 $166,900 - $230,900 per yearWebsite

Tech Stack

Tools & technologies

AndroidiOSJavaKotlinObjective-CReactReact NativeSwift

About the role

Key responsibilities & impact

Build and maintain user-facing features in our React Native mobile apps across iOS (and Android, as we expand).
Design and implement mobile components and subsystems that are performant, maintainable, and scalable across platforms.
Collaborate with product and design teams to scope, implement, and launch features that align with user and business needs.
Contribute to platform improvements, including tooling, testing strategies, CI/CD, and performance monitoring.
Work with backend engineers to define mobile-specific APIs and improve client-server integration patterns.
Identify and resolve performance or reliability issues in the mobile experience.
Participate in code reviews, architecture discussions, and technical planning to raise engineering quality across the team.
Support a strong mobile engineering culture through mentorship, collaboration, and a focus on continuous improvement.

Requirements

What you’ll need

Bachelor’s degree in Computer Science, Engineering, or Mathematics, or a related field (or its equivalent) + 4 years of experience
Have experience building in React Native, and familiarity with at least one native platform (e.g., Swift/Objective-C for iOS or Kotlin/Java for Android).
Understand mobile performance, memory management, and platform-specific constraints.
Communicate effectively with cross-functional partners in product, design, and backend engineering.
Take ownership of your work and are comfortable delivering complex features from planning through release.
Balance speed and quality, and advocate for maintainable, scalable engineering solutions.
Contribute to team culture and engineering practices through feedback, mentoring, and collaboration.
Embrace a growth mindset and enjoy learning from others while helping teammates grow.

Benefits

Comp & perks

Competitive compensation, including base pay, bonus opportunities, and annual equity grants that vest quarterly
Generous 401(k) plan with Upstart matching $2 for every $1 contributed, up to $15,000 per year
Employee Stock Purchase Plan (ESPP) with discounted stock purchase options for eligible employees
Affordable medical, dental, and vision coverage, with multiple plan options - Upstart covers 90% to 100% of the cost depending on the plans you choose
Health Savings Account contributions from Upstart for eligible plans
Income protection benefits, including company-paid Basic Life, AD&D, and Short- and Long-Term Disability coverage, with options to purchase supplemental coverage
Paid time off, sick and safe time, and company holidays
Paid family and parental leave to support caregiving and major life moments
Family-centered benefits through Carrot and Cleo, supporting fertility, parenthood, and caregiving
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
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 and onsites, all-company updates, and employee resource groups (ERGs)
Onsite perks, including catered lunches and fully stocked micro-kitchens when working from one of our four offices, located in the Bay Area, Austin, Columbus, and New York City (opening Summer 2026!).

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Hard Skills & Tools

React NativeSwiftObjective-CKotlinJavamobile performancememory managementCI/CDperformance monitoringAPI integration

Soft Skills

communicationownershipcollaborationmentorshipcontinuous improvementfeedbackgrowth mindsetteam cultureproblem-solvingtechnical planning

Certifications

Bachelor’s degree in Computer ScienceBachelor’s degree in EngineeringBachelor’s degree in Mathematics