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# Senior iOS Engineer - Payments & Hardware Integrations

- **Company:** Fiserv, Inc.
- **Location:** Sunnyvale, CA, United States
- **Experience:** Expert
- **Salary:** $140,000 - $210,000
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), IOS Applications, Apple IOS, Bluetooth Low Energy (Bluetooth), Bluetooth, C++ (Programming Language), Software Debugging, Memory Management, Firmware, Mobile Application Software, Key Management, Network Protocols, PCI Data Security Standards, Performance Tuning, Clover, RSA (Cryptosystem), Software Construction, Systems Architecture, Systems Integration, Tokenization, WebSocket, Transaction Processing (Computing), Multithreading, Backend, Stripe, Low Latency, Verifone, Api Design, Objective C++
- **Published:** November 12, 2026
- **Apply:** https://www.dice.com/job-detail/2e3ae3a6-51d4-4d7f-83e5-fe739d83ea2e

## About the Role

* iOS Mastery: 5+ years of hands-on experience building, testing, and shipping production-grade native iOS applications or frameworks using Swift and Objective-C.
 * Hardware & Peripheral Integration: Hands-on experience connecting iOS applications to external hardware accessories or peripherals using CoreBluetooth, Bluetooth Low Energy (BLE), MFi (Made for iPhone), or USB interfaces.
 * Framework Architecture: Deep understanding of iOS framework design, API architecture, multithreading, memory management, and asynchronous networking.
 * Security & Network Foundations: Exposure to secure key management, cryptographic principles (e.g., AES, RSA, tokenization), or REST/WebSocket APIs.
 * Debugging & Problem-Solving: Curiosity and drive to troubleshoot complex edge cases spanning software, network protocols, and physical hardware layers.

Experience that would be great to have

 * Card Reader & Payment Experience: Any prior experience working with payment processors, card readers (e.g., Clover, Square, Stripe Terminal, Ingenico, Verifone), or point-of-sale (POS) systems is highly valued.
 * Compliance Exposure: Familiarity with payment industry standards (PCI-DSS, PCI-PTS, EMVCo) or device certification workflows.
 * C/C++ Interop: Experience writing or maintaining shared native C/C++ libraries wrapped for iOS via Objective-C++ or Swift C-interop.

## Description

We are seeking a Senior iOS Engineer who enjoys bridging high-level mobile software with physical hardware. Based at our campus in Sunnyvale, CA, you will serve as a hands-on technical lead driving mobile hardware integrations, Bluetooth reader SDKs, and core transaction flows across our native iOS framework. In this role, you will work closely with our on-site hardware labs, product teams, and Core Payments engineering to ensure fast, reliable, and secure mobile payment experiences. If you love building software that interacts with physical accessories-from Bluetooth readers to smart terminal devices-we want to talk to you!, * Hardware & SDK Engineering: Design, build, and maintain modular native iOS SDKs and frameworks that communicate with Bluetooth Low Energy (BLE) card readers, smart accessories, and next-generation terminal hardware.

 * Core Payment Integrations: Partner with backend and Core Payments teams to integrate transaction processing, tokenization, refunds, and secure cryptographic communications on iOS.
 * On-Site Prototyping & Lab Debugging: Leverage our state-of-the-art Sunnyvale hardware lab for real-time hardware-in-the-loop debugging, reader firmware testing, and performance optimization.
 * System Architecture: Write clean, maintainable Swift and Objective-C components emphasizing thread safety, low latency, and robust offline-first execution.
 * Global Team Alignment: Serve as a U.S.-based technical lead for iOS hardware integrations, bridging communication between local lab teams and global engineering groups.