Senior React Native Engineer

US Mobile; Montreal (administrative region); Hybrid; CAD 166,000 - 222,000; Full time

Benefits offered by this job

Annual offsite

Competitive salary

Gym reimbursement

Commute reimbursement

Flexible working hours

Professional development stipend

Flexible time off

Cell phone service

Job summary

US Mobile in Montreal is seeking a senior mobile engineer to build cross‑platform apps using React Native. You will own features from design through release, work with product and design, and shape the architecture for scale.

The role requires 7+ years in mobile, 5+ in React Native, hands-on Expo and CI/CD, and proven app-store launches. You will mentor teammates, write robust tests, and help define best practices across the team.

Qualifications

• 7+ years in mobile development with 5+ years in React Native.
• Proven launches on App Store and Google Play.
• Experience with Expo, over-the-air updates, and release automation.
• Excellent collaboration and knowledge sharing.

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 deliver user-friendly, high‑performance features.
• Establish robust testing frameworks and release processes, and coordinate with QA.
• Mentor engineers and contribute to development guidelines.
• Create and maintain design and development documentation.
• Explore React Native ecosystem and present findings to influence decisions.
• Champion user experience throughout the product lifecycle.

Skills

React Native

TypeScript

Mobile app development

Team leadership

Tools

Expo

CI/CD

Release automation

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.

What You'll Do:

• 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.

Role Requirements:

• 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.

Core Technologies We're Currently Building With:

• React Native (0.83+) + TypeScript
• Tanstack ReactQuery
• React Navigation

Benefits:

• 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 hours
• Professional development stipend
• Flexible time off
• Cell phone service (up to $100/mo)

$120,000 - $160,000 a year