Android Developer with Java Back End

Title: Android Developer with Java Back End

Duration: 6+ Months

Location: Richfield, MN (Hybrid)

Project Description:

• This developer would be focused on an Android application with a Java back end that we use on our mobile Android devices in the field.
• This application manages login (OIDC-based SSO), retail time notifications (FCM), and session management for internal as well as third party applications and provides security and usage tracking and reporting.

Position Summary/Job Description: We’re looking for an experienced Android developer to help modernize and add enhancements to this application.

1. Skills Overview:

   What are the top five skills and number of years of experience required to perform this job?

   Deep Java & Architecture Expertise:

   1. Expert-level knowledge of Java 11/17/21 and traditional Android threading models.
   2. Advanced knowledge of WorkManager, Foreground Services, and BroadcastReceivers.
   3. Experience managing "Always-On" background services that must survive aggressive battery optimization and system reboots.

   Identity & Security (OIDC):

   1. Proven experience implementing OIDC (OpenID Connect) and OAuth 2.0 flows using the AppAuth-Android library.
   2. Experience managing secure token storage via EncryptedSharedPreferences and MasterKey management.

   Enterprise Messaging & Handshakes:

   1. Hands-on experience with Firebase Cloud Messaging (FCM) (Data Messages) and Microsoft Azure Notification Hub (ANH).
   2. Experience implementing complex registration "handshakes" involving multi-tier authentication and device/session mapping.

   Inter-Process Communication (IPC):

   1. Proven experience with AIDL (Android Interface Definition Language) and Binders.
   2. Ability to manage secure communication and state synchronization between multiple separate apps on the same device.

   Modernization & SDK Migration:

   1. Experience migrating legacy projects (Support Library 28) to AndroidX and Android 14 (API 34).
   2. Understanding of modern security requirements: PendingIntent mutability, Foreground Service Types, and granular Permission models.

    

   What are some preferred/nice to have skills the manager is looking for?

   1. Enterprise Device Management: Experience with Zebra/Symbol devices, EMDK, DataWedge.
   2. Data Integrity: Experience with oracle or SQL database for high-volume logging and local configuration storage.
   3. Tooling: Expert level with Gradle 8.5+, ProGuard/R8, and Git.