Senior React Native Engineer

Usmobile; Toronto; On-site; CAD 110,000 - 170,000; Full time

Benefits offered by this job

Gym reimbursement

Commute reimbursement

Flexible hours

Professional development stipend

Flexible time off

Cell phone allowance

Job summary

US Mobile is seeking an experienced mobile engineer to lead cross-platform development using React Native. You’ll own feature delivery from design to production, with focus on performance, reliability, and a great user experience.

We value fast, flexible collaboration in a startup environment. You have 7+ years in mobile development (5+ in React Native) and a track record of shipping apps to App Store and Google Play, with Expo OTA updates and release automation.

Qualifications

• Minimum 7 years in mobile development (with 5 years React Native expertise).
• Proven track record of launching apps on App Store and Google Play.
• Experience with Expo OTA updates and release automation.
• Experience delivering in dynamic startup environments with high code quality.
• Knowledge of iOS and Android UX principles.

Responsibilities

• Build cross-platform mobile applications using React Native with modular, maintainable architecture.
• Modernize and refactor features to improve performance and scalability.
• Collaborate with product and design to create high-performance user-facing features.
• Establish testing frameworks, reliability standards, and streamlined release processes with QA.
• Mentor engineers and contribute to development guidelines and best practices.
• Create and maintain documentation and contribute to design guidelines.
• Research emerging React Native technologies and influence design decisions.
• Champion user experience across the product lifecycle.

Skills

React Native

TypeScript

React Query

React Navigation

Mobile development

CI/CD

Job description

US Mobile is building the future of wireless communication. The goal: one unified network open to any person and any device, worldwide. Connection without walls.

We’re getting there by empowering customers. All three major networks on one phone and one plan, plus home internet from Starlink. No lock-in. No commitments. Custom fit plans at every price point. 24/7 customer support with real people, empowered to help. We get real-time feedback from Reddit, surveys, and customer support informing product roadmaps and everything we do. It’s working — Consumer Reports named us the top-rated mobile carrier two years in a row.*

And we’re building innovative systems that scale. A network agnostic tech stack. Agile, cross-functional teams built on trust and mutual respect. This work isn’t for everyone. If you work fast, flexibly, and collaboratively — without compromising standards — we want to hear from you.

• Build cross-platform mobile applications using React Native, ensuring modular, extensible, and maintainable architecture.
• Modernize and refactor existing application features to enhance performance, scalability, and future-proofing by leveraging performance metrics and error monitoring platforms.
• Partner closely with product and design stakeholders to create high-performance, user-friendly features with strong visual appeal.
• Establish and maintain robust testing frameworks, reliability standards, and streamlined release processes as well as collaborate with QA to ensure testing coverage.
• Guide and develop fellow engineers while fostering an environment focused on high-quality code, creative solutions, and ongoing skill development.
• Create and maintain clear process documentation as well as contribute to development and design guidelines.
• Research emerging technologies and best practices within the React Native ecosystem; present findings to the team and influence design and technical decisions.
• Champion user experience across the product lifecycle, ensuring designs translate seamlessly into practical, engaging solutions.
• Minimum 7 years in mobile development (with 5 years of hands-on React Native expertise). Proven track record of successfully launching applications on App Store and Google Play.
• Knowledge of mobile user experience principles and the distinct characteristics of iOS and Android platforms.
• Hands-on experience with continuous integration/deployment, over-the-air updates (such as Expo), and release automation.
• Demonstrated ability to excel in dynamic startup settings—delivering quickly without compromising code quality.
• Excellent interpersonal skills with a passion for knowledge sharing and team collaboration.
• React Native (0.83+) + TypeScript
• Tanstack ReactQuery
• React Navigation
• Competitive Salary
• Gym reimbursement
• Commute reimbursement
• Flexible working hours
• Professional development stipend
• Flexible time off
• Cell phone service (up to $100/mo)