Senior Mobile Engineer (React Native) — Offline-First Apps

Ontrac Solutions; Chicago (IL); On-site; USD 120,000 - 150,000; Full time

Job summary

Ontrac Solutions in Chicago is seeking a Senior Software Engineer (Mobile) to lead offline-first React Native apps for a government-regulated platform hosted on Google Cloud. You will own features end-to-end with minimal supervision and collaborate with client leads, backend engineers, and stakeholders.

Required: 7+ years in software engineering, 3+ years with React Native, and a CS degree. Responsibilities include encrypted local storage, barcode/QR scanning, signature capture, GPS, and robust

Qualifications

• 7+ years of professional software engineering experience, including 3+ years with React Native

Responsibilities

• Build the offline-first field-inspection tablet application on React Native / Expo for iPadOS and Android enterprise tablets
• Implement encrypted local storage for inspection checklists, violation records, and draft reports
• Implement barcode/QR credential scanning and digital stylus signature capture
• Implement photo evidence capture with timestamping and geotagging
• Build the background data synchronization engine between device and backend
• Integrate Okta authentication and secure session handling for field-deployed devices
• Deliver unit and E2E test coverage, participate in code reviews, and maintain the build and distribution pipeline for both platforms

Skills

React Native

TypeScript

Offline-first

REST API integration

Mobile testing

Education

Bachelor's degree in Computer Science or equivalent

Tools

Expo toolchain

Xcode

Android Studio

Detox

Maestro

Okta authentication

Job description

Ontrac Solutions in Chicago is seeking a Senior Software Engineer (Mobile) to lead offline-first React Native apps for a government-regulated platform hosted on Google Cloud. You will own features end-to-end with minimal supervision and collaborate with client leads, backend engineers, and stakeholders.

Required: 7+ years in software engineering, 3+ years with React Native, and a CS degree. Responsibilities include encrypted local storage, barcode/QR scanning, signature capture, GPS, and robust