2 months 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.
About Tillster
Tillster builds a unified commerce platform for multi‑unit restaurant chains, offering online and mobile ordering, delivery management, kiosks, loyalty, and integrated marketing with POS integrations. The privately held company, founded in 2002 and headquartered in Los Angeles, serves global brands including Burger King, Baskin‑Robbins, and Jollibee. Its SaaS model supports personalized guest engagement across channels for large restaurant enterprises.