[Hiring] Principal Software Engineer @HubSpot

Role Description

We're looking for a Principal Software Engineer to help shape the technical future of Revenue Hub. This is a very hands-on role. You'll write code, dive into services, review tough designs, debug messy systems, and directly own the architecture behind CPQ, Billing, Payments, and Revenue OS. A big part of this role is defining how external developers and AI agents interact with those surfaces safely and predictably.

What You'll Do

• Build a simple, consistent, extensible platform.
• Shape the technical roadmap across CPQ, Billing, and Payments with strong, opinionated patterns.
• Define and evolve core domain models so pricing, products, contracts, invoices, and payments behave predictably in the UI, over the API, and inside agent-driven workflows.
• Design the API and platform contracts that let developers, partners, and AI agents extend Revenue Hub without coupling to internals.
• Create frameworks that make the platform easy to extend without adding complexity.
• Be a deeply hands-on, high-leverage builder.
• Write code regularly. Lead design reviews and build high-impact systems end-to-end.
• Own large multi-team initiatives that span CPQ, Billing, and Payments.
• Take prototypes to production at scale.
• Lead architectural direction.
• Set patterns for extensibility, contract boundaries, financial correctness, event-driven consistency, and how AI agents safely interact with commerce objects.
• Push for simplicity where the domain wants to get complicated, and consistency where surfaces can drift.
• Partner deeply with product leadership.
• Influence product strategy across CPQ, Buyer Portal, and Revenue OS.
• Help teams make clear tradeoffs between speed, correctness, compliance, and long-term platform health.
• Raise the bar across the org.
• Mentor senior engineers and tech leads.
• Drive thoughtful design decisions and guide learnings from incidents and large migrations.
• Help teams align on patterns that reduce complexity and increase reliability.

Qualifications

• Proven experience building and scaling distributed systems with strict correctness requirements.
• Strong instincts for API and platform design. You've built things external teams depend on and know what that responsibility feels like.
• Background working with complex state machines, financial flows, or high-integrity data models.
• Familiarity with agentic systems and what it means for AI to safely act on structured data, not just read it.
• The ability to work horizontally across many teams and get alignment on platform patterns.
• A habit of turning ambiguity into clear plans and working software, and staying hands-on every step of the way.