Sr. Software Engineer – Mobile Engineer

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

OVERVIEW

We are seeking a highly skilled and experienced Senior Software Engineer (Mobile) to join a contractor program supporting a critical customer engagement: a state government professional licensing and regulatory compliance platform built on Google Cloud. This role is ideal for a senior mobile engineer who has shipped offline-first React Native applications to production on iOS and Android and can own a feature area end to end with minimal supervision. The successful candidate will work closely with the client technical lead, the backend engineering team, and customer stakeholders to ensure project success from initial definition through final delivery.

Expected start date: 5 October 2026.

REQUIRED CREDENTIALS

• 7+ years of professional software engineering experience, including 3+ years with React Native
• At least one production application shipped to the Apple App Store or Google Play, or through enterprise distribution
• Bachelor's degree in Computer Science or equivalent practical experience

REQUIRED QUALIFICATIONS

• React Native and TypeScript, including the Expo toolchain
• Comfortable working in the native iOS and Android layers (Xcode, Android Studio) to integrate, configure, and debug native modules
• Offline-first architecture: local SQLite storage, encryption at rest, and data synchronization
• Device hardware integration: camera, barcode/QR scanning, signature capture, GPS
• Authentication with OIDC/OAuth 2.0 (Okta or comparable) and secure token storage
• REST API integration against backend services
• Mobile testing with Jest and an E2E framework such as Detox or Maestro

USEFUL QUALIFICATIONS

• Enterprise tablet deployment and mobile device management
• Familiarity with Google Cloud Platform services
• Experience in government or regulated environments
• Mobile accessibility (WCAG 2.1 AA)
• Mobile CI/CD (EAS, Fastlane, GitHub Actions)

SCOPE AND SOLUTION EXPECTATIONS

Below covers the scope of work we anticipate the contractor supporting throughout the project timeline.

• 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