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 existing platform into a modular, pluggable payment SDK with versioning, compatibility, capability negotiation, dependency isolation, configuration, and secret management.
- Design a common terminal abstraction across integrated, semi-integrated, cloud, REST, and cash-device processors.
- Build integration testing, simulation, certification, and regression-testing harnesses for internal and external integrations.
- Establish platform patterns for idempotency, transaction recovery, reversal, timeouts, health monitoring, concurrency, and reconciliation.
- Design PCI-DSS scope minimization using tokenization, P2PE, TLS/mTLS, and secure certificate and key handling.
- Implement terminal integrations from byte-level protocols through the high-level PayTerminal API.
- Work with RS-232, USB-serial, USB, terminal SDKs, processor APIs, webhooks, retries, polling, and reconciliation.
- 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.
Requirements
- 6+ years of backend engineering experience with strong Java, object-oriented programming, and distributed-systems design experience.
- Experience designing extensible plugin, SPI, or SDK architectures, including ServiceLoader, OSGi, Spring plugin models, or public SDKs.
- Hands-on serial or USB communication and binary protocol implementation experience, 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, Redsys, Worldpay, or comparable platforms.
- Understanding of card transaction lifecycles, PCI-DSS boundaries, tokenization, and TLS/mTLS in production.
- Demonstrated technical leadership through design leadership, standards-setting, and mentoring.
- EMV, ISO 8583, ZVT, or OPI experience is a strong plus.
- Experience with cash automation, recyclers, end-of-day and reconciliation tooling, regional acquiring, multi-currency payments, loyalty, stored value, gift, Apple Pay, Google Pay, 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, EAP, and Optum Care counseling services for eligible full-time employees and dependents.
- Ten paid holidays per calendar year.
- 15 days of PTO during the first 12 months of continuous service and 22 days in subsequent years; eligible part-time employees receive prorated PTO.
- 401(k) plan eligibility beginning on the employment start date.
- College tuition and education assistance, Udemy courses, and ongoing learning and development opportunities.
- No visa sponsorship; principals only and no agencies or calls.
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.