Kotlin Multiplatform Engineer

About the Company

PayPlus is building one of the most advanced commerce and payment platforms in Israel. Not another boring cash register. Not another legacy POS.

We are building an AI-powered retail operating system combining payments, smart checkout, inventory, loyalty, vending, commerce automation, and real-time business intelligence into a single platform used by thousands of businesses every day.

From fashion chains and restaurants to vending machines and autonomous retail, our software runs in the real world, processes real money, and operates at massive scale.

About the Role

We are looking for a strong Kotlin Multiplatform Engineer to join our mobile engineering team and help shape the architecture of the next generation of PayPlus products.

you will design and build shared, production-grade code across platforms, with a strong focus on creating reusable domain, business, networking, data, synchronization, and infrastructure layers.

You will work across the boundary between shared and platform-specific code, deciding what belongs in the common layer and what should remain native.

You will also contribute to the Android experience and work closely with backend, hardware, and product teams to build reliable commerce and payment applications.

This is an opportunity to have a direct impact on the architecture of a real-world platform combining Kotlin Multiplatform, payments, AI, commerce, hardware, cloud infrastructure, and real-time systems.

Responsibilities

• Design and develop production applications using Kotlin Multiplatform
• Own and evolve the shared KMP architecture across the product

Build reusable shared modules for:

• Domain and business logic
• Networking and API communication
• Data and persistence
• Authentication and authorization
• State management
• Synchronization
• Offline-first capabilities
• error handling and observability
• Define clear boundaries between shared KMP code and platform-specific implementations
• Develop platform-specific integrations for Android and other supported platforms
• Build modern UI experiences using Jetpack Compose and Compose Multiplatform
• Integrate the application with payment terminals, printers, scanners, vending machines, and other external hardware
• Build platform-specific integrations for Bluetooth, USB, Serial, and other hardware communication
• Design robust offline-first and synchronization mechanisms for environments where connectivity cannot be guaranteed
• Build real-time experiences connected to cloud services and event-driven backend systems
• Optimize shared and platform-specific code for performance, stability, and reliability
• Establish reusable libraries and engineering patterns for KMP development
• Debug complex issues across shared code, native platform code, networking, and hardware
• Collaborate closely with Backend, Product, QA, DevOps, and Hardware teams
• Participate in architectural decisions and technical design
• Ship software used daily by thousands of merchants

Qualifications

• 3+ years of professional software/mobile development experience
• Strong Kotlin experience
• Strong hands-on experience with Kotlin Multiplatform
• Experience designing and maintaining shared code across multiple platforms
• Strong understanding of modular architecture and separation between shared and platform-specific code
• Strong understanding of asynchronous programming and concurrency
• Experience with Kotlin Coroutines and Flow
• Experience with REST APIs and networking
• Experience with local persistence such as SQLite / Room
• Experience with clean architecture and scalable application design
• Strong Android development experience
• Experience with Jetpack Compose
• Ability to debug complex production issues
• Ability to make pragmatic architectural decisions in a real-world product environment
• Passion for building products and solving engineering problems beyond simply implementing tickets

Required Skills

Kotlin

Kotlin Multiplatform

Kotlin Coroutines & Flow

Shared module architecture

Clean Architecture

Modular development

REST APIs

Local persistence / SQLite / Room

Git

Production software development

Big Advantages

• Experience with Compose Multiplatform
• Experience with KMP on both Android and iOS
• Experience building reusable KMP libraries or SDKs
• Experience with KMP networking and persistence solutions
• Experience with platform-specific implementations using expect/actual or equivalent architectural patterns
• Experience with POS systems or payment applications
• Experience integrating with payment terminals and external hardware
• Experience with Bluetooth / USB / Serial communication
• Experience building offline-first applications
• Experience with synchronization and event-driven systems
• Experience with CI/CD and production deployments
• Experience in fintech, commerce, retail, or other high-reliability environments

Why Join PayPlus?

This is not another task factory mobile job.

You will have the opportunity to shape a Kotlin Multiplatform architecture from the ground up and build shared technology that powers real-world commerce.

Your code will run in stores, restaurants, kiosks, vending machines, and retail environments across the country.

You’ll work at the intersection of Kotlin Multiplatform, fintech, AI, commerce, hardware, cloud infrastructure, and real-world scale.

Most importantly, you’ll build software that people actually use every single day.