Lead Engineer, Integration Platform

Why Fulfil

Fulfil is a technical founder-led, bootstrapped company. 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.

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. No red tape. No product managers. No layers of approval. You won't be buried in meetings — you'll drive technical direction while still shipping code.

At a large company, leads attend syncs and write roadmap decks. Here, you'll design integration systems that process thousands of orders per minute and mentor the engineers who build them.

The Team

Integration Platform owns all external connections: Shopify, Amazon, marketplaces, 3PLs, carriers, EDI. We process thousands of orders per minute. North star: integrations are reliable, scalable, debuggable, and fast to build.

A Typical Week

• Monday: Define Q2 technical roadmap with Product Lead. Three major merchants expanding to new channels. Prioritize the platform work.

• Tuesday: Deep dive on Shopify sync performance. Design a path to handle 10x current volume.

• Wednesday: Mentor a Senior Engineer on their first framework project. Review design, push back on over-engineering.

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

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

What You'll Own

• Technical roadmap for Integration Platform

• Architecture decisions affecting thousands of orders/minute

• Performance and reliability across all integrations

• Growing Senior Engineers into Leads

• Partner relationships (Shopify, Amazon technical teams)

What We're Looking For

• 6-9 years building backend systems at scale

• Deep experience with integration platforms or iPaaS

• Track record of technical leadership

• You've designed systems that others now maintain

• Expert in distributed systems, async processing

• 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.