Senior React Native Engineer

Usmobile; Montreal (administrative region); On-site; CAD 110,000 - 170,000; Full time

Benefits offered by this job

Annual offsite and hackathon

Competitive salary

Gym reimbursement

Commute reimbursement

Flexible working hours

Professional development stipend

Flexible time off

Cell phone service (up to $100/mo)

Job summary

US Mobile in Montreal, Canada is seeking a senior mobile engineer to lead cross‑platform React Native development. You will build modular features, refactor existing code for performance, and partner with product/design to ship high‑quality experiences on iOS and Android.

You will mentor teammates and help establish robust testing and release processes, while staying current with RN best practices and Expo tooling.

Qualifications

• 7+ years in mobile development with hands-on React Native experience.
• Proven track record launching apps on App Store and Google Play.

Responsibilities

• Build cross-platform mobile applications using React Native, ensuring modular, extensible architecture.
• Modernize existing features to improve performance and scalability with monitoring.
• Collaborate with product/design to deliver high-performance, user-friendly features.
• Establish testing frameworks and release processes with QA collaboration.
• Mentor engineers and promote high-quality code and knowledge sharing.
• Create and maintain development guidelines and process docs.
• Research RN ecosystem trends and influence design decisions.
• Champion user experience across the product lifecycle.

Skills

React Native

TypeScript

App Store & Google Play

CI/CD

Expo

Tanstack ReactQuery

React Navigation

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.

Responsibilities and Requirements

• 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

Benefits and Perks

• Annual company offsite and hackathon in a global destination. Past locations include Dubai, Japan, and Hawaii, with New Zealand planned for 2027
• Competitive Salary
• Gym reimbursement
• Commute reimbursement
• Flexible working hoursProfessional development stipend
• Flexible time off
• Cell phone service (up to $100/mo)