Senior Android Kotlin Developer

About This Role

This is a critical engineering role on Trustmarq's mobile platform team. You will lead end-to-end development and optimization of Android applications — including a complex offline-first kiosk and a field staff mobile app built for real-world variability, poor connectivity, and high-reliability payment processing.

You will have meaningful architectural autonomy. We build tech that directly supports nonprofits and mission-driven organizations in the field — online, offline, and everywhere in between.

Key Responsibilities

Lead end-to-end development and optimization of Android apps using Kotlin and Jetpack Compose

Architect and maintain robust mobile payment workflows via Stripe, Square, and other gateways — supporting retries, refunds, offline capture, and reconciliation

Integrate with AWS backend services (Lambda, API Gateway, Cognito, DynamoDB) through secure REST APIs

Deliver seamless UX across diverse form factors (tablets, handhelds) with responsive and adaptive UI patterns

Champion offline-first strategies using local data persistence, sync queues, and conflict resolution

Collaborate daily with Product, UAT, Customer Success, and Architecture teams in biweekly sprints

Write scalable, testable, clean code; contribute to unit, UI, and integration test coverage

Conduct peer code reviews and refactor legacy components to align with clean architecture and modern Android standards

Use Firebase Crashlytics, Remote Config, and log aggregators to monitor app health in real time

Participate in incident response for mobile stack issues and resolve critical field-reported bugs

Requirements

5+ years of Android development with Kotlin; strong command of modern Android frameworks

Proven experience with multiple mobile payment SDKs (Stripe, Square, or similar) — including gateway abstraction layers and dynamic routing logic

Terminal integration experience via Bluetooth, USB, and embedded NFC sensors; must have extensive hands-on Terminal SDK (Android) experience in production

Complete card reader lifecycle management: discovery, pairing, connection, disconnection, reconnection, and recovery flows

Custom management of connection tokens, reader IDs, reader-to-location binding, and online/offline reader behavior

Experience designing offline-first and resilient payment systems — queuing locally, preventing duplicate charges across retries, and syncing on reconnect

Familiarity with AWS services: Lambda, API Gateway, Cognito, DynamoDB

Deep knowledge of MVVM, Clean Architecture, Jetpack Compose, and dependency injection (Dagger/Hilt)

Proficient with Git, peer review workflows, and CI/CD pipelines

Working knowledge of Android Enterprise tools such as kiosk mode and device lockdown configurations

Familiarity with Firebase Analytics, Crashlytics, and Remote Config

Bonus Qualifications

Open source contributions, side projects, or community engagement in Android development

Experience working with nonprofit or social impact technology platforms

Why Join Trustmarq

A chance to build tech that directly supports nonprofits in the field

Remote-friendly, impact-driven team culture with clear sprint delivery metrics

Opportunities to lead architectural decisions and shape the mobile platform's future

A collaborative work environment aligned with clear business goals

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About This Role

Key Responsibilities

Requirements

Bonus Qualifications

Why Join Trustmarq

Ready to modernize your security program?