Senior Mobile Developer

Harris Computer; Wisconsin; On-site; USD 125,000 - 135,000; Full time

Job summary

Harris Computer is hiring a senior mobile engineer in Wisconsin to drive architecture and implementation across Kotlin and Swift apps. You will shape UI with Jetpack Compose and SwiftUI, guide MVVM patterns, and build robust REST integrations with modern tooling.

You will mentor peers, review code, and help shape multi-tenant AI-enabled development processes using Copilot and related AI tools. Strong testing and CI/CD practices are required.

Qualifications

• Bachelor's degree or Diploma in Computer Science, Engineering or related field.
• 8+ years of software development experience, 3+ years in mobile-focused engineering.
• Strong understanding of software principles, patterns, and system architecture.

Responsibilities

• Contribute to architectural discussions and design decisions aligned with business goals.
• Solve complex technical problems and guide technology selection and planning.
• Provide technical leadership and code reviews to junior team members.
• Ensure code quality, maintainability and adherence to standards.

Skills

Kotlin

Swift

Jetpack Compose

SwiftUI

MVVM

Dependency Injection

Koin

REST APIs

Retrofit/OkHttp

URLSession

Unit Testing

UI Testing

JUnit

Mockito

Robolectric

Espresso

Compose UI Test

XCTest

XCUITest

Gradle

Swift Package Manager

Bitrise

Fastlane

GitHub Copilot

AI Prompting

Education

Bachelor's degree

Tools

Bitrise

Fastlane

Gradle

Swift Package Manager

Retrofit/OkHttp

URLSession

Job description

• Proficiency in Kotlin & Swift: Deep understanding of modern Kotlin (coroutines/Flow, serialization) and Swift (async/await), including the platform runtimes, memory management and concurrency.
• Native UI Frameworks: Experience building production UI with declarative frameworks — Jetpack Compose on Android and SwiftUI on iOS — including state management and lifecycle.
• Architecture & Dependency Injection: Experience with reactive, testable mobile architectures (e.g. MVVM, The Composable Architecture) and dependency injection frameworks such as Koin.
• RESTful API Integration: Experience designing and consuming robust, scalable REST APIs for third-party integrations and internal UI consumption (e.g. Retrofit/OkHttp on Android, URLSession on iOS).
• Testing Frameworks: Proficiency with mobile testing across the pyramid — unit, integration, and UI testing with tools such as JUnit, Mockito, Robolectric, Espresso, and Compose UI test on Android; XCTest and XCUITest on iOS.
• Mobile Tooling & CI/CD: Experience with automated, multi-target build and release pipelines (e.g. Gradle, Swift Package Manager, Bitrise, Fastlane), ideally for white-label / multi-tenant apps.
• Worked on AI assisted development (e.g. GitHub Copilot, Claude, Cursor or ChatGPT)
• Familiarity with AI directed prompt engineering for developing applications.

• Proficiency in Kotlin & Swift: Deep understanding of modern Kotlin (coroutines/Flow, serialization) and Swift (async/await), including the platform runtimes, memory management and concurrency.
• Native UI Frameworks: Experience building production UI with declarative frameworks — Jetpack Compose on Android and SwiftUI on iOS — including state management and lifecycle.
• Architecture & Dependency Injection: Experience with reactive, testable mobile architectures (e.g. MVVM, The Composable Architecture) and dependency injection frameworks such as Koin.
• RESTful API Integration: Experience designing and consuming robust, scalable REST APIs for third-party integrations and internal UI consumption (e.g. Retrofit/OkHttp on Android, URLSession on iOS).
• Testing Frameworks: Proficiency with mobile testing across the pyramid — unit, integration, and UI testing with tools such as JUnit, Mockito, Robolectric, Espresso, and Compose UI test on Android; XCTest and XCUITest on iOS.
• Mobile Tooling & CI/CD: Experience with automated, multi-target build and release pipelines (e.g. Gradle, Swift Package Manager, Bitrise, Fastlane), ideally for white-label / multi-tenant apps.
• Worked on AI assisted development (e.g. GitHub Copilot, Claude, Cursor or ChatGPT)
• Familiarity with AI directed prompt engineering for developing applications.

Responsibilities & Duties

• Contribute to architectural discussions, make design decisions, and ensure that the overall software architecture aligns with business goals and industry best practices.
• Solve complex technical problems and make critical decisions related to technology selection, system architecture, and project planning.
• Provide technical leadership and guidance to junior members of the development team.
• Conduct code reviews to ensure code quality, maintainability, and adherence to coding standards.

Requirements

• Bachelor's degree or Diploma in Computer Science, Engineering, related field, or equivalent work experience.
• 8+ years of experience in software development, and 3+ years as a Software Engineer with a focus on designing and building complex, scalable systems.
• Deep understanding of software engineering principles, design patterns, algorithms, and system architecture.
• Ability to lead technical discussions, make critical decisions, and drive consensus among team members.
• Experience with cloud technologies and microservices architecture.

Salary range: $125,000 - $135,000 USD per year.