Senior Python Engineer, Integrations

Build Production-Grade Integrations: Design, build, and maintain Python integrations across commerce, logistics, finance, and fulfillment workflows, including 3PLs, carriers, sales channels, and merchant-specific operational logic.

Own the Full Lifecycle: Take work from customer problem to technical design, implementation, code review, deployment, production support, and continuous improvement. At Fulfil, raising the PR is not the finish line.

Solve Real Customer Problems: Work directly with customers, support, and implementation teams to diagnose issues, understand operational workflows, and identify product gaps. You’ll translate messy real-world problems into durable technical solutions.

Raise the Engineering Bar: Partner with our India-based engineering team on architecture, code quality, reviews, reliability, and maintainability. “It works” is not enough; the code needs to be understandable, supportable, and scalable.

Scale North American Engineering Coverage: Help create stronger EST technical coverage for merchant escalations, integration support, and customer-facing discovery as Fulfil builds its Toronto engineering presence.

Turn Patterns Into Product: Identify recurring integration needs and customer pain points, then turn one-off solutions into scalable product capabilities.

Use AI Thoughtfully: Use AI tools as a force multiplier for engineering velocity while maintaining strong judgment, review discipline, and code quality.

Work Close to Leadership: Collaborate with technical leadership, including our founder/CEO, on product and engineering decisions where the best answer is not always obvious.

We are looking for a senior engineer who is strong technically, clear with customers, and energized by ownership.

Strong Python experience in production systems

Experience building and maintaining integrations with third-party APIs, including REST, webhooks, retries, idempotency, rate limits, and failure handling

Strong backend fundamentals: data modelling, async processing, queues, background jobs, and production debugging

Experience with PostgreSQL and ORM patterns; SQLAlchemy is a strong plus

Strong judgment around code quality, readability, and maintainability

Comfort working directly with customers or business stakeholders

A product mindset. You ask: “Is this the right thing to build?” not just “What ticket am I assigned?”

Curiosity about AI and how it changes engineering workflows, review processes, and merchant automation

The ability to work across time zones with a strong engineering team in India

A desire to help shape what engineering in Toronto becomes at Fulfil

Comfort with rigorous code review. You should expect direct, detailed feedback on design, readability, maintainability, and edge cases and engage with that feedback without ego.

Founder-led, bootstrapped, and profitable - Fulfil is product-obsessed and built for long-term impact, not short-term hype.

We move quickly because our customers depend on us - Our customers run real operations across orders, inventory, fulfillment, warehouses, accounting, and customer promises.

High ownership, low bureaucracy - You will not be handed tickets that fully describe the solution, and you will not wait weeks for approvals.

You are expected to think through the problem - You will seek context, talk to the right people, exercise good judgment, make recommendations, and own the outcome.

Clean code matters - We care deeply about readable, maintainable code that teammates can understand, support, and build on later.

Reviews are rigorous - Pull requests may go through multiple rounds of review. We would rather delay a release than ship code that creates future operational pain.

You will thrive here if you want: Autonomy, direct customer context, strong engineering standards, and the chance to help build the ERP platform behind the next generation of commerce brands.

This is not the right fit if you want: A highly layered organization, a narrow coding-only role, or a roadmap where every decision has already been made for you.

Fulfil is the modern ERP for commerce. Built to power the fastest-growing eCommerce brands, our platform brings together order management, inventory, accounting, and more, turning complex operations into a strategic advantage.

We’re trusted by brands like HexClad, Ridge Wallet, Caraway, and Resident, and backed by people who want to change the way merchant operations are run. We believe in deep work, radical accountability, and building tools that let sharp people move faster.