Lead Engineer, Finance

Why Fulfil

Fulfil is a technical founder-led, bootstrapped company in our 11th year of operations. We're a small team of exceptional engineers powering millions of orders for brands like HexClad, Ridge Wallet, and Caraway. You won't be buried in meetings — you'll drive technical direction while still shipping code.

At a large company, leads write strategy docs. Here, you'll design financial systems, mentor engineers, and see your decisions impact merchants processing millions of dollars.

The Team

Finance owns accounting, reconciliation, revenue recognition, and financial integrations. North star: books close on time with transactions posted automatically.

A Typical Week

• Monday: Define the technical roadmap for Q2 with Product Lead. A major merchant needs multi-entity consolidation before their audit. Prioritize.

• Tuesday: Deep dive on reconciliation performance. Design a path from 85% auto-match to 98%.

• Wednesday: Mentor a Senior Engineer on their first architecture project. Review their design, push back on unnecessary complexity.

• Thursday: Ship a critical fix yourself. Some weeks you're 80% code, some weeks 20%.

• Friday: Interview a Staff Engineer candidate. Debrief. Make the call.

What You'll Own

• Technical roadmap for Finance

• Architecture decisions affecting millions in transactions

• Performance and reliability of financial systems

• Growing Senior Engineers into Leads

• Cross-team coordination on financial data flows

What We're Looking For

• 6-9 years building backend systems at scale

• Experience with fintech, accounting, or financial systems

• Track record of technical leadership

• You've designed systems that others now maintain

• Deep expertise in Python and PostgreSQL

• Strong opinions, loosely held

Tech Stack

Python, PostgreSQL, Redis, Celery, RabbitMQ, SQLAlchemy, Kubernetes, pytest, Claude Code, etc.

Hiring Process (We move fast)

1. Initial interview — Technical leadership experience

2. Live coding — Yes, leads still code here

3. Interview loop — Architecture, mentorship, bar raiser

4. Bootcamp — Leads also start in Product Support to learn how merchants use Fulfil

Our Approach to AI

What We Do

• Leverage LLMs (OpenAI API, Claude API) to embed AI-driven capabilities into Fulfil’s ERP, powering natural language interfaces, intelligent automation, and merchant-facing insights (e.g., Fulfil x MCP integrations with Claude).

• Focus on AI for commerce operations — integrating models to solve real problems like order management, financial analysis, customer insights, and logistics optimisation.

What We Don’t

• We are not a core ML/AI research company — we don’t train or fine-tune foundation models.

• We focus on integration and productisation of AI, not building new ML frameworks or developing custom model architectures.

What It’s Really Like to Work at Fulfil
We’re building the ERP that fast-growing eCommerce brands actually want to use, which means we’re taking on entrenched enterprise software with a small, intense team.

Big Tech and VC-backed startups are 400-horsepower engines running at 25% efficiency. They have bloated teams, endless meetings, six months to ship a feature. At Fulfil, we’re a 200-horsepower engine running at 100%. We’re bootstrapped, profitable, and growing steadily. No permission layers. No “alignment meetings” about alignment meetings. Everyone ships everyday.

The work: You’ll own meaningful problems with direct customer impact. Our customers run 24/7 operations across time zones, and when they’re launching on BFCM or scaling from $10M to $100M, they need us to move fast. That urgency flows downstream. This is high-intensity work with real consequences.

What high-intensity actually means:

• Most weeks are 45-55 hours; peak seasons (BFCM, major launches) hit 60+

• Occasional off-hours calls with our distributed team or for customer launches

• Long days (10+ hours) aren’t uncommon

• The work doesn’t pause even if we try to protect your focus time

What you get in return:

• Real autonomy over execution (we measure impact, not facetime)

• Ownership of problems that matter to real businesses

• Unlimited PTO we actually want you to use (we’d rather you rest than burn out)

• If you’ve ever felt like you’re capable of 10x more than your current environment allows you to output, that’s the gap between your potential and your actual impact. Fulfil eliminates that gap.

You’ll thrive here if: you’re the type who gets energy from building something that matters, want ownership over outcomes vs tasks, are open to receiving regular, direct feedback in public Slack channels from multiple people, and like moving fast without red tape.
This isn’t for you if: you need a strict 40-hour boundary, prefer structured oversight, or want work to be a contained part of your life.