Principal Product Engineer – AI Checkout

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Phoenix Ecommerce Technologies

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2024

🛍️ eCommerce

💳 Fintech

☁️ SaaS

🔥 Funding within the last year

💰 $5M Series unknown on 2025-11

eCommerce • Fintech • SaaS

Phoenix Ecommerce Technologies is an ecommerce infrastructure and payments platform built for high-volume direct-to-consumer (D2C) merchants. It provides a headless, no-code customizable checkout and funnel builder, AI-powered decline recovery and payment routing, tokenized vaulting, subscription and billing management, and analytics to optimize approvals, conversions, and lifetime value. The product emphasizes higher authorization rates, faster wallet-native checkouts (Apple Pay, Google Pay), multi-processor support, and retention automation for subscription and direct-response brands.

📋 Description

• Design, build, and own Phoenix’s checkout and post-purchase system for an agent-native future • Architect and build a modular, high-conversion AI-native checkout and post-purchase system • Own the full-stack vertical slice from React/Next.js through TypeScript/Node services, payment tokenization, and order capture • Build high-performance rendering, gRPC/gRPC-web service boundaries, CDN and edge caching, and supporting data models • Develop LLM-driven flows, tool calling, schema-constrained generation, structured context, and agent memory capabilities • Integrate checkout logic across Stripe, Spreedly, and TSYS within PCI-compliant frontend constraints • Implement analytics hooks, A/B testing, dynamic upsells, post-purchase offers, and funnel optimization • Own SLOs, telemetry, on-call, and incident response for mission-critical checkout systems • Produce clean, tested, documented code, ADRs/RFCs, and an operationalized agentic SDLC • Set Phoenix’s technical bar and raise team velocity and quality through hands-on code and design

🎯 Requirements

• 10+ years building and shipping web platforms with staff/principal-level impact as a hands-on individual contributor • Deep full-stack expertise in TypeScript/Node (Express, Fastify, or Nest) and React/Next.js or Angular • Strong systems design skills, including SSR, streaming, hydration, CDN/edge caching, gRPC/gRPC-web, and API design • Experience with authentication, pagination, versioning, rate limits, and secure middleware • Data modeling experience with Postgres/MySQL, document stores, and Redis • Daily use of AI coding tools such as Claude Code or equivalent agentic coding setups • Understanding of context windows, memory systems, tool calling, schema-constrained generation, RAG, and evaluation loops • Hands-on experience shipping agentic AI/LLM products to production using the Vercel AI SDK or similar • Testing experience with Jest, integration testing, and Playwright E2E testing • Operability experience with SLO/SLA thinking, telemetry, on-call, and incident response • Excellent written communication and experience producing ADRs/RFCs • Preferred: DTC commerce, checkout, ecommerce tooling, payments/fintech infrastructure, page-builder infrastructure, Kotlin, GCP, advanced caching, Liquid templating, or Shopify ecosystem experience