4 months ago
Base Salary
$150k - $175k/yr
Responsibilities
- Own the kiosk payment domain end to end, including authorization, capture, void, refund, reversal, settlement, and reconciliation.
- Re-architect the payment-terminal platform into a modular, pluggable SDK with lifecycle management, versioning, backward compatibility, capability negotiation, dependency isolation, configuration, and secrets handling.
- Design a unified terminal abstraction spanning integrated, semi-integrated, cloud, REST, and cash-device processors.
- Build an integration test and certification harness for validating, simulating, and regression-testing new integrations before hardware deployment.
- Establish platform-wide patterns for idempotency, transaction recovery, reversals, timeouts, health monitoring, concurrency, and reconciliation.
- Design PCI-DSS scope minimization using tokenization, P2PE, processor-specific TLS/mTLS, and certificate and key handling.
- Implement terminal integrations from byte-level protocols through the high-level PayTerminal API.
- Work with RS-232, USB-serial, USB, cloud processor APIs, REST, SOAP, webhooks, and semi-integrated terminal SDKs.
- Debug live hardware using protocol traces, terminal logs, packet captures, and vendor certification cycles.
- Lead architecture and design reviews, set technical direction, and mentor engineers building integrations.
Requirements
- 6+ years of backend engineering experience with strong Java, Maven, Spring, 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.
- Hands-on experience with serial or USB communication and binary protocol implementation, including TLV, BCD, bitmaps, length-prefixed fields, and state machines.
- Direct payment-terminal or POS integration experience and understanding of integrated versus semi-integrated models.
- Strong understanding of card transaction lifecycles, PCI-DSS boundaries, tokenization, and production TLS/mTLS.
- Track record of technical leadership, including leading designs, setting standards, and mentoring engineers.
- Preferred experience with EMV, ISO 8583, ZVT, OPI, cash automation and recyclers, regional acquiring, multi-currency payments, loyalty, stored-value, gift, Apple Pay, Google Pay, vendor certification, 3-D Secure, SCA, and fraud or risk tooling.
Benefits
- Hybrid role that must be based in San Diego, California; local candidates only.
- Medical, dental, vision, FSA, healthcare and dependent-care reimbursement programs, EAP, and Optum Care 24-hour medical counseling for eligible full-time employees and dependents.
- Ten paid holidays per calendar year.
- 15 days of PTO during the first 12 months and 22 days in subsequent years for eligible full-time employees; part-time PTO is prorated.
- 401(k) eligibility begins with employment.
- College tuition and education assistance, Udemy courses, and ongoing learning and development opportunities.
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.