Principal Software Engineer, Mobile

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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.

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.

• 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

• 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/Swift
  
  UI) 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.

Base Pay Range: $174,845—$242,000 USD. 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.

• Compensation: Competitive base pay tied to role and experience, with opportunities for bonuses, commissions, and equity.
• Benefits: Check out our full list at
• Environment: Hybrid‑hub model – whether you’re in one of our offices or fully remote, we’ll provide the tools you need to succeed.

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.