Senior iOS Engineer – Payments & Hardware Integrations

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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.

Job Title

About your role:

Clover, a Fiserv company, is a global leader in point-of-sale platforms powering millions of small businesses worldwide with integrated hardware, software, and payment solutions. We are seeking a Senior iOS Engineer with deep expertise in mobile payments, payment reader hardware integration, and core transaction flows. Based in Sunnyvale, you will serve as the hands-on technical lead driving hardware certification, reader SDK integrations, and alignment with our Core Payments infrastructure. You will work closely with on-site hardware labs, certification teams, and cross-functional engineering groups to ensure fast, secure, and compliant mobile payment experiences.

What you’ll do:

• Design, build, and maintain native iOS framework components for Bluetooth Low Energy (BLE) and EMV card readers, including Go3 reader hardware and next-generation terminal integrations.
• Lead end-to-end device and software payment certification efforts (e.g., PCI-DSS, PCI-PTS, EMVCo L1/L2/L3) in close collaboration with on-site lab teams.
• Interface directly with Core Payments engineering to integrate transaction processing, tokenization, refunds, and cryptographic protocols on iOS.
• Utilize on-site hardware lab access in Sunnyvale to conduct real-time hardware debugging, reader firmware testing, and performance optimization.
• Serve as the US-based Subject Matter Expert (SME) for iOS payments, bridging communication between local infrastructure teams and global development groups.
• Responsibilities listed are not intended to be all-inclusive and may be modified as necessary.

Experience you’ll need to have:

• iOS Expertise: 5+ years of hands-on experience building complex, production-grade native iOS applications using Swift and Objective-C.
• Domain Knowledge (Payments): Proven track record working with payment processors, EMV kernels, ISO 8583 / point-of-sale protocols, or card-present payment architectures.
• Hardware/SDK Integration: Hands-on experience integrating external Bluetooth Low Energy (BLE), MFi (Made for iPhone), or USB accessories/readers into iOS apps.
• Certification Standards: Experience navigating payment industry standards (PCI-DSS, PCI-PTS, EMVCo) and executing device certification cycles.
• Debugging & Architecture: Deep understanding of secure key management, cryptographic protocols (DUKPT, AES, RSA), multithreading, and low-level protocol debugging.

Experience that would be great to have:

• Prior experience with POS (Point of Sale) platforms or reader hardware (e.g., Clover, Square, Ingenico, Verifone).
• Experience writing or maintaining shared native C/C++ libraries wrapped for iOS.

How you’ll work:

• 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.

Sponsorship:

• You must currently possess valid and unrestricted U.S. work authorization to be considered for this role. Individuals with temporary visas including, but not limited to, F-1 (OPT, CPT, STEM), H-1B, H-2, or TN, or any candidate requiring sponsorship, now or in the future, will not be considered for this role.

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

Salary Range

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.

Thank you for considering employment with Fiserv. Please:

• Apply using your legal name
• Complete the step-by-step profile and attach your resume (either is acceptable, both are preferable).

Our commitment to Equal Opportunity:

Fiserv is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, gender, gender identity, sexual orientation, age, disability, protected veteran status, or any other category protected by law.

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