4 months ago
Base Salary
$150k - $165k/yr
Responsibilities
- Own the kiosk payment domain, including authorization, capture, voids, refunds, reversals, settlement, and reconciliation.
- Re-architect the payment platform into a modular, pluggable SDK with plugin discovery, registration, versioning, backward compatibility, capability negotiation, dependency isolation, configuration, and secrets management.
- Design a terminal abstraction covering integrated, semi-integrated, cloud, REST, and cash-payment processors and devices.
- Build integration testing, simulation, certification, and regression-testing harnesses for new and external integrations.
- Establish platform-wide patterns for idempotency, transaction recovery, reversals, timeouts, health monitoring, concurrency, and reconciliation.
- Design PCI-DSS scope minimization using tokenization, P2PE, TLS/mTLS, and certificate and key handling, while partnering with security and QSA teams on audits.
- Implement terminal integrations from byte-level protocols through the high-level PayTerminal API.
- Work with serial and USB transports, including port handling, event-driven reads, reconnection, and timing.
- Integrate processor APIs and terminal SDKs using REST, SOAP, webhooks, retry, polling, and reconciliation mechanisms.
- Debug live hardware through protocol traces, terminal logs, packet captures, and vendor certification cycles.
- Drive architecture and design reviews, set technical direction, and mentor engineers building integrations.
Requirements
- 6+ years of backend engineering experience with strong Java, Spring, Maven, object-oriented programming, and distributed-systems design skills.
- Demonstrated experience designing extensible plugin or SPI-based architectures, such as ServiceLoader, OSGi, Spring plugin models, or public SDKs used by other teams or third parties.
- Hands-on experience with low-level device and protocol communication, including serial or USB communication and binary protocols such as 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, Redsys, or Worldpay, or comparable platforms.
- Strong understanding of card transaction lifecycles, PCI-DSS boundaries, tokenization, and TLS/mTLS in production.
- Track record of technical leadership, including leading designs, setting standards, and mentoring engineers.
- EMV, ISO 8583, ZVT, or OPI experience is a strong plus.
- Experience with cash automation and recyclers, end-of-day and reconciliation tooling, regional acquiring, multi-currency payments, loyalty, stored value, gift, wallet integrations, Apple Pay, or Google Pay is desirable.
- Vendor certification experience with acquirers and processors, 3-D Secure, SCA, or fraud and risk tooling is desirable.
- Must be based in San Diego, California, for the hybrid role.
Benefits
- Medical, dental, vision, FSA, healthcare and dependent-care reimbursement programs, an Employee Assistance Program, and Optum Care 24-hour confidential medical counseling services are available to eligible full-time employees and dependents.
- Ten paid holidays are provided per calendar year.
- Eligible 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.
- Employees are eligible to participate in the 401(k) plan starting on their employment date.
- College tuition and education assistance, Udemy courses, and ongoing learning and development opportunities are offered.
- The role is hybrid and requires the candidate to be based in San Diego, California.
- The position is a full-time regular employee role.
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.