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.

• 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.

• This role is on-site Monday through Friday. Fiserv considers in-person collaboration to be an essential part of this role as in-person office experiences help you with your overall onboarding experience and leads to stronger productivity.
• This role requires use of a computer and audio equipment.

Benefits at Fiserv:

• Fuel Your Life program to support your 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 program to recognize your peers’ extra effort with points redeemable for rewards
• Eight Employee Resource Groups to foster a collaborative culture and expand your network
• Unparalleled professional growth with training, development, and internal mobility opportunities
• Medical, dental, vision, life, and disability insurance options available from day one
• Retirement planning and discounted shares with the Employee Stock Purchase Plan
• Tuition assistance and reimbursement program
• Paid parental, caregiver, and military leave

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Salary Range $140,000.00 - $210,000.00

These pay ranges apply to employees in Sunnyvale, California. Pay ranges for employees in other states may differ.

It is unlawful to discriminate against a prospective employee due to the individual’s status as a veteran.

For incentive eligible associates, the successful candidate is eligible for an annual incentive opportunity which may be delivered as a mix of cash bonus and equity awards in the Company’s sole discretion.

We’re Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we’re involved. If you want to make an impact on a global scale, come make a difference at Fiserv., Clover is a global leader in point-of-sale platforms powering millions of small businesses worldwide with integrated hardware, software, and payment solutions.