Mobile Engineer

Trellis; United States; Remote; USD 90,000 - 130,000; Full time

Job summary

Trellis is seeking a mobile developer to build and improve a field-focused mobile product for iOS and Android. You will work on offline-first data handling, synchronization, and performance, ensuring smooth operation in challenging field conditions.

Responsibilities include learning field workflows, developing with Expo and React Native, testing on real devices, and owning releases from implementation to rollout.

Qualifications

• Experience building mobile apps with Expo and React Native.
• Deliver and maintain features across iOS and Android.
• Offline-first data handling and syncing.

Responsibilities

• Learn field workflows and real-world constraints.
• Develop mobile experiences using Expo and React Native.
• Design offline-first data handling, synchronization, and recovery.
• Test on real devices and investigate performance issues.
• Own releases from implementation through rollout.
• Improve core workflows for field users to complete tasks faster and more accurately.

Skills

Expo

React Native

Offline-first

Real devices testing

Tools

Expo

React Native

Job description

Role overview

Build and improve a mobile product for people doing hands-on work in the field, including cleaning, maintenance, and operational tasks. The focus is on making essential workflows clear and dependable when users have limited time, attention, or network access, across both iOS and Android.

Responsibilities

• Learn how field teams complete tasks and where real-world conditions make their work difficult.
• Develop and refine mobile experiences using Expo and React Native for iOS and Android.
• Design offline-first data handling, synchronization, notifications, and recovery from interrupted sessions.
• Test on physical devices and investigate performance issues.
• Own releases from implementation through rollout, monitoring quality and user impact.
• Improve a core workflow so field users can complete it more quickly and accurately.

Requirements

• Experience building mobile applications with Expo and React Native.
• Ability to deliver and maintain features across iOS and Android.
• Understanding of offline-first behavior, data synchronization, and recovery when connectivity is unreliable.
• Practical experience testing on real devices and assessing app performance.
• Ability to manage a feature through implementation, release, and follow-up improvement.

Benefits and work setup

• Work is centered on real field conditions and the needs of operational teams.
• The role owns the mobile release and quality loop, with the goal of improving the product without disrupting users’ work.