22 days ago
San Diego, CA, USASenior
Base Salary
$150k - $165k/yr
Responsibilities
- Own the kiosk payment domain, including authorization, capture, void, refund, reversal, settlement, and reconciliation.
- Re-architect the payment platform into a modular, pluggable, versioned SDK over the PayTerminal SPI.
- Design a unified terminal abstraction covering integrated, semi-integrated, cloud, REST-based, and cash-processing devices.
- Build integration testing, simulation, certification, and regression-testing infrastructure for new and external integrations.
- Define patterns for idempotency, transaction recovery, timeouts, health monitoring, concurrency, and reconciliation.
- Implement payment-terminal integrations from byte-level protocols through the high-level PayTerminal API.
- Develop and maintain serial and USB transport integrations, including reconnection and event-driven reads.
- Integrate processor APIs and terminal SDKs with retry, polling, webhook, and reconciliation workflows.
- Design PCI-DSS scope minimization using tokenization, P2PE, TLS/mTLS, and certificate and key handling.
- Lead architecture and design reviews, establish technical direction, and mentor engineers.
Requirements
- 6+ years of backend engineering experience with strong Java, OOP, and distributed-systems design skills.
- Experience with multi-module Maven/Java applications using Spring.
- Demonstrated experience designing extensible plugin or SPI-based architectures, such as ServiceLoader, OSGi, Spring plugin models, or public SDKs.
- Hands-on experience with serial or USB communication and binary protocols, including TLV, BCD, bitmaps, length-prefixed fields, and state machines.
- Direct payment-terminal or POS integration experience with providers such as Verifone, Ingenico, Adyen, Shift4, FreedomPay, SIX, Nepting, SiTef, or Redsys.
- Understanding of card transaction lifecycles, PCI-DSS boundaries, tokenization, and TLS/mTLS in production.
- Track record of technical leadership, design ownership, standards-setting, and mentoring.
- Experience with EMV, ISO 8583, ZVT, or OPI is a strong plus.
- Experience with cash automation, regional acquiring, multi-currency payments, loyalty, stored value, wallets, vendor certification, 3-D Secure, SCA, or fraud and risk tooling is preferred.
Benefits
- Hybrid role requiring the employee to be based in San Diego, California; local candidates only.
- Medical, dental, vision, FSA, healthcare and dependent-care reimbursement programs, an Employee Assistance Program, and Optum Care counseling services are available to eligible full-time employees and dependents.
- Ten paid holidays per calendar year.
- Full-time employees receive 15 days of PTO during the first 12 months and 22 days in subsequent years; eligible part-time employees receive prorated PTO.
- 401(k) plan eligibility begins on the employment start date.
- College tuition and education assistance, Udemy courses, and ongoing learning and development opportunities are available.
