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Principal Software Engineer, Mobile

Remote - USA

About Engine
At Engine, we’re transforming business travel into something personalized, rewarding, and simple. For too long, managing travel and spend has been overwhelming and fragmented — we’re here to change that. We believe the future of travel should be seamless and powered by technology that delights customers at every step. That’s why we’re building a platform that brings together corporate travel, a powerful charge card, and modern spend management in one place.

To make this vision real, we’re looking for exceptional, mission-driven people to help redefine how businesses manage and experience travel.

More than 20,000 companies already rely on Engine to support over 1 million travelers and billions in annual bookings each year. Cash flow positive with rapid growth, we pair exclusive Engine-only rates, industry-leading rewards, and intelligent automation to help businesses save money while delivering world-class personalization and convenience.

Backed by Telescope Partners, Blackstone, and Permira, Engine has been recognized as one of the fastest-growing travel and fintech platforms in North America, with honors including the Deloitte Fast 500 and Built In’s Best Places to Work.

Your Mission:

We are looking for a Mobile Principal Engineer to serve as the most senior hands-on technical leader on our mobile team. In this role, you’ll shape the long-term mobile vision, drive technical excellence across iOS and Android (with iOS as the lead platform), and work cross-functionally to ensure a seamless, unified experience between our mobile and web platforms.

You’ll partner closely with product, design, and web engineering teams to define a cohesive mobile strategy, influence roadmap priorities, and establish consistent architecture, patterns, and development standards. You’ll mentor Staff and Senior Engineers, elevate engineering quality, and be the technical voice guiding our mobile investments and platform evolution.

What you’ll do: 

  • Lead technical direction and long-term architectural vision for our mobile applications (built primarily in React Native)
  • Act as the principal hands-on contributor, setting standards for engineering quality, performance, and scalability
  • Drive alignment across mobile and web teams to ensure a consistent and unified user experience
  • Collaborate with product and design leadership to shape strategy, execution plans, and sequencing for major mobile initiatives
  • Establish scalable patterns, frameworks, and development standards across the mobile organization
  • Partner with design and platform engineering on system-wide initiatives such as shared components, navigation, and design systems
  • Champion engineering excellence through architecture reviews, performance optimization, and technical rigor
  • Identify and mitigate technical risks while fostering innovation and experimentation
  • Mentor Staff and Senior Engineers, providing technical guidance and helping to grow future leaders
  • Act as a mobile subject-matter expert across the broader organization

What you’ll bring: 

  • 8–12+ years of experience building and shipping high-quality mobile applications at scale
  • Deep expertise with React Native and experience designing large, production-grade applications
  • Strong understanding of mobile architecture, performance tuning, and platform best practices
  • Experience with native iOS (Swift/SwiftUI) and/or Android (Kotlin/Jetpack) development is a strong plus
  • Proven ability to lead technical initiatives and influence cross-functional teams
  • Strong systems thinking and a bias toward scalable frameworks and reusable patterns
  • Experience mentoring Staff and Senior Engineers and shaping technical culture
  • Excellent communication skills and the ability to drive clarity and alignment across teams

Applications for this role will be accepted through March 7th or until the role is filled. We encourage you to apply early, as we may begin reviewing applications before the deadline.

Compensation
Our compensation packages are based on several factors, including your experience, expertise, and location. In addition to a competitive base salary, total compensation may include equity and/or variable pay (OTE). Your recruiter will share your complete compensation package as you move through the process.

Base Pay Range

$174,845 - $242,000 USD

The Engine Edge: Perks & Compensation
We believe in rewarding great work with great benefits:

  • Compensation: Competitive base pay tied to role and experience, with opportunities for bonuses, commissions, and equity.
  • Benefits: Check out our full list at engine.com/culture.
  • Environments for Success: Different roles have different needs in terms of the environments that drive success which is why we have a hybrid-hub model. Whether you are in one of our amazing offices or fully remote, we’ll make sure you have what you need to succeed.

Perks and benefits may vary based on employment type, location, and more.

Ready to Build the Future of Work Travel?
Join us on our mission to transform how work travel works—for businesses, for travelers, and for the industry. Apply now and let’s make travel simpler, smarter, and more enjoyable—together.

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