Senior iOS Engineer – Payments & Hardware Integrations

Fiserv•Sunnyvale, CA

6d•$140,000 - $210,000•Onsite

About The Position

Fiserv is seeking a Senior iOS Engineer for Clover, its point-of-sale platform. Based at the Sunnyvale, California campus, this hands-on technical lead will drive mobile hardware integrations, Bluetooth reader SDKs, and core transaction flows across Clover’s native iOS framework. The role works closely with on-site hardware labs, product teams, Core Payments engineering, and global engineering groups to deliver fast, reliable, and secure mobile payment experiences. The engineer will design and maintain native iOS SDKs and frameworks that communicate with Bluetooth Low Energy card readers, smart accessories, and terminal hardware; integrate payment processing and security features; and debug and optimize devices in a hardware lab. The role emphasizes clean, maintainable Swift and Objective-C code, thread safety, low latency, and robust offline-first operation. This role is on-site Monday through Friday in Sunnyvale, California. It requires use of a computer and audio equipment. The stated salary range for Sunnyvale employees is $140,000 to $210,000. Incentive-eligible associates may also be eligible for an annual incentive opportunity delivered as cash bonus and/or equity awards at the company’s discretion.

Requirements

At least 5 years of hands-on experience building, testing, and shipping production-grade native iOS applications or frameworks using Swift and Objective-C.
Hands-on experience connecting iOS applications to external hardware accessories or peripherals using CoreBluetooth, Bluetooth Low Energy (BLE), MFi, or USB interfaces.
Deep understanding of iOS framework design, API architecture, multithreading, memory management, and asynchronous networking.
Exposure to secure key management, cryptographic principles such as AES, RSA, or tokenization, or REST/WebSocket APIs.
Curiosity and drive to troubleshoot complex edge cases spanning software, network protocols, and physical hardware layers.

Nice To Haves

Experience with payment processors, card readers such as Clover, Square, Stripe Terminal, Ingenico, or Verifone, or point-of-sale systems.
Familiarity with payment industry standards such as PCI-DSS, PCI-PTS, or EMVCo, or device certification workflows.
Experience writing or maintaining shared native C/C++ libraries wrapped for iOS via Objective-C++ or Swift C-interop.

Responsibilities

Design, build, and maintain modular native iOS SDKs and frameworks that communicate with Bluetooth Low Energy card readers, smart accessories, and next-generation terminal hardware.
Partner with backend and Core Payments teams to integrate transaction processing, tokenization, refunds, and secure cryptographic communications on iOS.
Use the Sunnyvale hardware lab for hardware-in-the-loop debugging, reader firmware testing, and performance optimization.
Write clean, maintainable Swift and Objective-C components emphasizing thread safety, low latency, and robust offline-first execution.
Serve as a U.S.-based technical lead for iOS hardware integrations, coordinating communication between local lab teams and global engineering groups.

Benefits

Fuel Your Life program supporting physical, financial, social, and emotional well-being.
Paid holidays and generous time-away policies.
No-cost mental health support through Employee Assistance Programs.
Living Proof peer-recognition program with points redeemable for rewards.
Eight Employee Resource Groups.
Professional growth through training, development, and internal mobility opportunities.
Medical, dental, vision, life, and disability insurance options available from day one.
Retirement planning and discounted shares through the Employee Stock Purchase Plan.
Tuition assistance and reimbursement program.
Paid parental, caregiver, and military leave.
Annual incentive opportunity for eligible associates, which may be delivered as cash bonus and/or equity awards at the company’s discretion.