Senior / Staff Backend Engineer - Payments

We are looking for a Senior Backend Engineer with 6+ years of experience to join a lean, high-impact engineering team building the payments infrastructure that powers vendor payments for thousands of community management companies. You'll be part of HOAi, a Vantaca business that operates with startup intensity inside a unicorn-valued organization ($1.25B). This is not a cog-in-the-wheel role — with only ~12 engineers on the team, you'll have outsized ownership and direct influence on product, architecture, and business decisions. We need someone who thrives in fast-paced, scrappy environments and is deeply comfortable using AI tools as a core part of their engineering workflow.

What will you be doing?

Orchestrating the movement of money through third-party banking APIs (Increase, Grasshopper Bank) — building and maintaining the payment flows that reliably process vendor payments end-to-end

Building vendor onboarding systems, onboarding analytics, and the management company portal experience for payment status visibility and vendor invitations

Developing the vendor marketplace — making vendors discoverable by management companies

Building AI-powered features like the virtual card agent that autonomously pays vendor invoices using human-like reasoning

Wearing multiple hats beyond pure engineering — participating in product decisions, pricing discussions, and direct customer interactions in a true startup fashion