Senior Software Engineer - Integrated Payment Experience (IPX)

Calling all innovators - find your future at Fiserv.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 TitleSenior Software Engineer - Integrated Payment Experience (IPX)About your role:Fiserv is a global leader in financial technology, and our Clover platform empowers millions of merchants worldwide to accept payments and manage their business operations. The Integrated Payment Experience (IPX) team builds and maintains the core software ecosystem powering these transactions—owning a portfolio of 20+ native Android applications, public SDKs, and integration microservices deployed across Clover POS terminals. As a Senior Software Engineer, you will work in a hybrid full-stack capacity (predominantly focused (~80%) on native Android development with ~20% backend Java/microservices contribution) to bridge POS hardware, merchant applications, and 3rd-party integrators by building resilient client architectures, defining robust client-to-server API contracts, and enforcing strict payment security standards across our global device fleet.What you’ll do:Architect, modularize, and maintain a portfolio of 20+ native Android applications using Kotlin, Jetpack, Coroutines, and Clean Architecture (~80% focus).Build, document, and support public-facing Clover SDKs and APIs that empower 3rd-party developers to build seamless payment applications on our platform.Design, build, and support lightweight Java backend microservices, gateways, or integration middleware (~20% focus) that connect mobile endpoints to server-side payment infrastructure.Develop custom native applications running directly on Clover Android hardware while building resilient semi-integrated (SEMI) solutions to connect external software endpoints.Partner closely with server and backend engineering teams to define, optimize, and consume robust RESTful API contracts for end-to-end transaction flows.Enforce strict payment security protocols (including Android KeyStore management and server-side tokenization) across all applications, SDKs, and 3rd-party integration touchpoints.Own end-to-end quality, fleet stability, and release operations for multi-app deployments across a massive network of Clover devices.Responsibilities listed are not intended to be all-inclusive and may be modified as necessary.Experience you’ll need to have:Bachelor’s degree in Computer Science, Software Engineering, or equivalent professional experience.5+ years of professional software engineering experience, primarily focused on native Android development using Kotlin, alongside hands-on backend development in Java.Demonstrated ability to work across a hybrid stack—combining client-side Android mobile development (~80%) with backend microservices engineering (~20%).Demonstrated experience developing, maintaining, or modularizing multi-app Android codebases, client-facing SDKs, or developer libraries.Hands-on experience building and integrating RESTful APIs and Java backend microservices, with a clear understanding of client-server architecture principles.Deep understanding of payment lifecycles (auth, capture, void, refund, tip adjustments, terminal setup) and security standards (PCI-DSS, EMV, tokenization).Proven experience building or maintaining integration touchpoints for 3rd-party developers and external partners.Experience that would be great to have:Hands-on experience developing native apps or SEMI integrations for Clover POS hardware using Clover SDKs, Clover Connector, or REST Pay API (or experience with Verifone, Ingenico, Square, PAX).Proficiency with Java / Spring Boot for building backend integration microservices or middleware to support mobile APIs.Proficiency in Android debugging tools (ADB, Android Studio, memory profiling) and secure Android OS patterns (KeyStore, hardware-backed encryption).Experience designing intuitive API contracts, SDK developer documentation, or integration guides for external developers.Experience managing CI/CD automation pipelines for application fleets (Fastlane, Bitrise, GitHub Actions, Jenkins).Hands-on experience with hardware/peripheral integrations over USB, Serial, or Bluetooth protocols on Android.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.Benefits at Fiserv:Fuel Your Life program to support your physical, financial, social, and emotional well-beingPaid holidays and generous time away policiesNo-cost mental health support through Employee Assistance ProgramsLiving Proof program to recognize your peers’ extra effort with points redeemable for rewardsEight Employee Resource Groups to foster a collaborative culture and expand your network·Unparalleled professional growth with training, development, and internal mobility opportunitiesMedical, dental, vision, life, and disability insurance options available from day oneRetirement planning and discounted shares with the Employee Stock Purchase PlanTuition assistance and reimbursement programPaid parental, caregiver, and military leave#LI-SH2Salary Range$140,000.00 - $210,000.00These 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.Thank you for considering employment with Fiserv. Please:Apply using your legal nameComplete 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. If you have a disability and require a reasonable accommodation in completing a job application or otherwise participating in the overall hiring process, please contact View email address on click.appcast.io. Please note our AskHR representatives do not have visibility to your application status. Current associates who require a workplace accommodation should refer to Fiserv’s Disability Accommodation Policy for additional information.Note to agencies:Fiserv does not accept resume submissions from agencies outside of existing agreements. Please do not send resumes to Fiserv associates. Fiserv is not responsible for any fees associated with unsolicited resume submissions.Warning about fake job posts:Please be aware of fraudulent job postings that are not affiliated with Fiserv. Fraudulent job postings may be used by cyber criminals to target your personally identifiable information and/or to steal money or financial information. Any communications from a Fiserv representative will come from a legitimate Fiserv email address.SummaryLocation: Sunnyvale, CaliforniaType: Full time