Full Stack Engineer

Full Stack Engineer

Series A Fintech

New York (onsite)

Up to $240K + Equity

My client is a Series A Fintech start up – they offer an AI-native accounts receivable platform that turns contracts into cash. They save company’s time and increase their cash on hand.

As a Full-Stack Engineer, you'll own core pieces of the platform – billing, payments, collections, integrations, and the AI systems that tie them together. You'll build product that customers pay for, ship it fast, and iterate directly on what you learn from how they use it. This is not a cog-in-the-machine role. You'll have enormous surface area, direct impact on revenue, and the autonomy to make real architectural decisions from day one.

Requirements:

• 4+ years of experience shipping production products/features
• Built and shipped full- stack features end- to- end
• Experience at a VC- backed startup or a reputable, fast- paced company (e. g. , Meta, Databricks, etc)
• Founding engineer or early- stage startup experience
• Experience with billing, payments, or financial systems
• Deep TypeScript fluency across backend and frontend

What You'll Do

Build Core Product: Own and ship full-stack features end-to-end: from database schema to API to UI. No handoffs, no waiting. Design and build systems that handle real money – billing engines, payment integrations, collections workflows, and revenue reporting that companies depend on to run their business. Make hard technical tradeoffs with good judgment. We're early – the decisions you make now become the foundation.

*Ship Fast, Stay Sharp*

• Operate at startup speed. We measure progress in days, not sprints.
• Write clean, production-grade TypeScript across the stack. You care about code quality not because someone told you to, but because you've been burned by the alternative.
• Build with AI as a core capability – not as a feature bolted on. You'll design AI-native workflows, use LLMs to accelerate your own output, and push the boundary of what's possible with agents and automation.

*Own Outcomes*

• You don't just write code – you understand why it matters. You'll talk to customers, see how they use what you build, and feed that directly into what you ship next.
• Drive technical direction in your area. Propose solutions, build consensus when needed, and execute when it's time.
• Improve the platform and the team around you – better tooling, better testing, better patterns. Leave everything better than you found it

Why candidates should join

• Just raised Series A: Moving at rocket ship trajectory and growing the team rapidly to meet skyrocketing demand
• Proven founders: George built and sold his last company for $100M+ to a Fortune 500. He's done this before and knows how to win
• Strong traction: 50+ customers and growing fast with 18+ months runway - they're capital efficient and scaling smartly
• Massive market opportunity: They're tackling the $125T B2B payments market where $3 trillion gets locked up in unpaid invoices every year