Senior iOS Engineer - Mobile App Developer Jobs

About Zūm:
Zūm is revolutionizing mass mobility with its Connected Mobility Experience (Zūm CMX™) system that connects and coordinates people, vehicles, and operations in real time. In the $50 billion student mobility market – the largest segment of the mass mobility industry.

Zūm CMX is transforming a daily source of anxiety and disruption into a reliable, transparent, and efficient mobility experience for students and families. Today, more than 6,500 schools rely on Zūm CMX. Recognized globally for its innovative approach and operational execution, Zūm has been named to Fast Company's World's Most Innovative Companies, CNBC Disruptor 50 and Changemakers, the World Economic Forum, and the Financial Times' Fastest Growing Companies lists. Zūm is backed by leading investors including Sequoia Capital, GIC, TPG, and Softbank.

About the Position

This role is based at the Company’s headquarters in Redwood Shores, CA and requires you to be onsite 3x/week (Monday, Tuesday, and Thursday). We will only consider candidates already based in the Bay Area.

Who You Are: Zūm is modernizing its iOS experience, and we're looking for a Senior iOS Engineer to help drive that work. Our iOS surface area spans multiple apps — Driver, Parent, Student, School, and Charter — that need to feel like one coherent product, moving thousands of students, vehicles, and school districts through a real-time logistics network.

You're a strong individual contributor who wants real influence over technical direction: architecture decisions, modernization strategy, and how the team approaches iOS engineering, while staying hands-on writing production code. This isn't a feature-factory role — you'll be a key voice in setting the technical bar for iOS at Zūm.

You'll work closely with our mobile lead, product, design, and engineering leadership on what the platform should look like, then help build the efforts that get us there.

What You'll Do:

Help own the architecture and technical roadmap for the iOS platform
Contribute to modernization efforts that move the codebase toward a modern, scalable, shared platform underneath multiple apps
Balance new feature delivery, legacy maintenance, and platform modernization work as we prepare the app for faster feature delivery
Partner closely with our mobile lead, product, design, and engineering leadership on technical direction, and collaborate with mobile engineering partners on shared work
Work across a wide surface area of APIs and services, bringing consumer-app polish to an operationally complex, enterprise-scale problem
Help set the technical bar for iOS at Zūm: code quality, architecture patterns, and how the team approaches modernization
Leverage AI tooling to accelerate development, improve code quality, and speed up modernization work
Modernize legacy features of the app toward current SwiftUI patterns without stalling feature delivery
Contribute to a shared platform layer that multiple Zūm apps (Driver, Parent, Student, School, Charter) can build on top of, instead of duplicating logic across codebases
Rework how the app handles a large and growing surface area of APIs so the codebase stays maintainable as complexity increases
Improve app performance and memory footprint, and build out telemetry/monitoring so the team can see how the app behaves in production
Help identify which parts of the current app are worth keeping versus updating, and execute

What You Bring To Zūm:

5+ years of professional iOS engineering experience, with real depth
Strong, current command of Swift and SwiftUI; you're living in modern iOS development
Experience owning meaningful parts of a consumer-facing app end-to-end, not just a single feature, page, or internal tool
A product-first orientation: comfortable with infrastructure work, but your track record is primarily product-driven
Experience working in a complex, consumer-facing app environment (think feature-rich apps with a large user base vs. a narrow enterprise tool or an SDK)
Comfort contributing to architectural decisions and modernization efforts at scale
Experience modernizing a legacy iOS app while it's still shipping features (preferred)
Background at a company with a small-to-mid-sized mobile team, where you had real hands-on ownership (preferred)
Experience partnering with an engineering leader or mobile lead on setting technical direction (preferred)

Bonus Points:

Domain experience in logistics, mapping, or fleet-style products
Experience working across multiple related apps sharing common infrastructure or design systems

The targeted base salary range for this role is listed in the compensation section below. Actual salary may be above or below this range based on factors such as location, skills, and relevant experience. In addition, this position may include additional compensation in the form of equity or commissions. If you are a full-time salaried or hourly worker, we offer the following benefits: Medical, Dental, Vision, 401(k), Holidays, Wellness, Vacation, and more. The targeted pay range for this role in CA, USA is: $200,000 - $240,000 plus stock options.