Full Stack Engineer

Full Stack EngineerRemote (US/ CANADA)Up to $230K + EquityUS Citizens/ Green CardTech stack: Ruby on Rails, PostgreSQL, React.js, AWS, TerraformMy client is am AI drive SaaS Start up and is the AI-native A/R operating system built for B2B distributors.Trade credit runs on relationships — but collecting on it has always run on spreadsheets, sticky notes, and phone calls that go nowhere. We replace that entire stack with an intelligent, always-on system that thinks, acts, and learns across every step of the A/R lifecycle.From the moment a new customer applies — on their phone, in minutes — Our agents are already working: pulling bank references, chasingJoin and help rebuild payments for the $1T+ distribution industry. You'll architect and build the systems that process millions of dollars in transactions daily, integrate with complex ERP systems, and leverage cutting-edge LLM technology to transform how distributors manage their revenue cycles.This is a hands-on engineering role. You'll own product end-to-end — from customer signal through spec, ship, and measurement. We're an AI-native team where Cursor, Claude Code, and agentic workflows are part of the daily flow, not optional. We invest more in clarity (specs, decompositions, conventions) than in process around them. AI handles a growing share of the implementation; humans set the targets, make the calls, and own the outcomes.You'll join a small team of A+ players where everyone is an individual contributor at the same level. We pair when stuck, review code thoroughly but kindly, and rise together. You'll work closely with our founder-led team — operators who previously ran a distribution business and understand the real-world problems we're solving.What you'll ownHigh-volume payment processing systems and secure financial APIsDeep integrations with major ERPs (NetSuite, Sage, Acumatica, etc.)LLM-powered workflows: credit decisions, remittance matching, automated comms, dispute resolutionReal-time data pipelines handling millions of financial recordsA/R and collections automation that directly impacts customer cash flowEval suites, observability, and guardrails that keep AI features safe in productionWhat we look forShips full-stack. Frontend, backend, schema, tests — handoffs aren't the model.Treats specs as the product. Decomposition into clear, scoped, runnable work is the highest-leverage skill on this team.AI in the daily flow. You don't wait for permission to use Cursor or Claude Code — you already do, and you push back when conventions need updating.Talks to users. Not "reads tickets" — actually joins customer calls and reads support threads.Owns past launch. If the customer experience around your work is broken, that's still on you.Requirements:Worked at a company with a high iteration speed on new products (startups < 100 people strongly preferred).Shipped production systems and user- facing features end- to- end within the last 1- 2 years.Backend expertise in an MVC framework (Ruby on Rails, Django, or Spring Boot).5+ years of experience as a backend- leaning full- stack engineer.Advanced experience with SQL databases like PostgreSQL.Actively uses AI tooling in day- to- day workflows.Must be available for quarterly off- sites in Austin.