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 existing PayTerminal SPI into a modular, pluggable, versioned SDK with plugin discovery, lifecycle management, capability negotiation, dependency isolation, configuration, and secrets handling.
- Design a unified terminal abstraction across integrated, semi-integrated, cloud/REST processors, and cash 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, partnering with security and QSA teams on audits.
- Implement terminal integrations from byte-level protocols through the high-level PayTerminal API.
- Work with RS-232, USB-serial, USB, device reconnection, event-driven reads, and timing; integrate REST/SOAP APIs, webhooks, polling, retries, and reconciliation.
- Debug live hardware using 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, object-oriented programming, and distributed-systems design skills.
- Experience designing extensible plugin, SPI-based, or public SDK architectures, such as ServiceLoader, OSGi, Spring plugin models, or SDKs used by other teams or third parties.
- Hands-on serial or USB communication experience and binary protocol implementation involving 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, Worldpay, or comparable platforms.
- Understanding of card transaction lifecycles, PCI-DSS boundaries, tokenization, and production TLS/mTLS.
- Demonstrated technical leadership through design leadership, standards-setting, and engineering mentorship.
- Experience with EMV, ISO 8583, ZVT, or OPI is a strong plus.
- Experience with cash automation and recyclers, regional acquiring, multi-currency payments, loyalty, stored value, gift, wallet integrations, 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.
- Full-time regular employees and dependents are eligible for medical, dental, vision, FSA, healthcare and dependent-care reimbursement programs, EAP, and Optum Care counseling services.
- 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.
- Eligibility to participate in the 401(k) plan 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.