Senior iOS Engineer (Payments & Hardware Integrations)

Quick Facts

• Role: Senior iOS Engineer (Payments & Hardware Integrations)

• Focus: Native iOS payments and hardware integration, including BLE card readers and terminal devices

• Work style: On-site, Monday–Friday

Description

Build and lead native iOS integrations for payments and physical hardware. You will design modular iOS SDKs/frameworks that communicate with Bluetooth Low Energy (BLE) card readers and smart terminal hardware, and partner with backend/Core Payments teams to integrate transaction processing, tokenization, refunds, and secure cryptographic communications. Use the on-site Sunnyvale hardware lab for hardware-in-the-loop debugging, reader firmware testing, and performance optimization.

Responsibilities

• Design, build, and maintain modular native iOS SDKs/frameworks for BLE and smart accessories/terminal hardware

• Integrate core payment flows on iOS with backend and Core Payments teams (transaction processing, tokenization, refunds, secure cryptographic communications)

• Conduct on-site prototyping and lab debugging with hardware-in-the-loop, including reader firmware testing and performance optimization

• Write clean, maintainable Swift/Objective-C components emphasizing thread safety, low latency, and offline-first execution

• Act as a U.S.-based technical lead bridging on-site lab work with global engineering groups

Requirements

• 5+ years of hands-on experience building and shipping production-grade native iOS applications or frameworks using Swift and Objective-C

• Hands-on experience connecting iOS apps to external hardware peripherals using CoreBluetooth/BLE, MFi, or USB interfaces

• Deep understanding of iOS framework/API architecture, multithreading, memory management, and asynchronous networking

• Exposure to secure key management and cryptographic principles (e.g., AES, RSA), tokenization, or REST/WebSocket APIs

• Strong debugging and problem-solving across software, network protocols, and physical hardware layers

Benefits

• Fuel Your Life program

• Paid holidays and generous time away

• No-cost mental health support via Employee Assistance Programs

• Living Proof recognition program

• Eight Employee Resource Groups

• Training, development, and internal mobility opportunities

• Medical, dental, vision, life, and disability insurance from day one

• Retirement planning and discounted shares via Employee Stock Purchase Plan

• Tuition assistance and reimbursement

• Paid parental, caregiver, and military leave