Sequence - Senior Product Engineer (Backend)

• We care deeply about the quality of the product we're building. We're looking for engineers who are ambitious and take ownership end-to-end: from identifying what to build, through shipping, to making sure it works for real customers. • Here’s what you might work on: • AI-powered approval workflows. Enterprise deals need approval chains, but rigid workflows break when every company has different rules. You'll build flexible routing that customers configure in natural language - "require VP approval for deals over $100k with annual terms" - and turn that into deterministic, auditable business logic. • An intelligent collections agent. Chasing late payments is tedious, manual work. We're building an agent you instruct in natural language (“send a reminder at 7 days overdue; escalate at 14 days”), which then runs the entire workflow autonomously. • Scaling billing infrastructure 10x. We’re building revenue-critical infrastructure and currently rearchitecting our billing pipeline for an order of magnitude more throughput - rethinking storage strategies, horizontal scalability, and how we’ll handle 10x load without 10x cost. • We're a lean team growing to 20+ engineers. You'll have real influence on what we build and how we build it. Early enough to shape fundamental architecture. Late enough that customers depend on what you ship. • You'll design systems that process high-velocity event streams, make technical decisions that balance cost and performance at scale, and build infrastructure that never compromises on reliability. • This is business-critical infrastructure: a dropped event means someone isn’t charged correctly. An outage at month-end means finance teams can't collect revenue from their customers. • What our newest hires have shipped • Watchtower: our command center for AI agents. As we introduce agents that automate financial workflows, customers need visibility and control. This included building our first agent - a contract intake system that extracts customer and pricing information from uploaded or emailed contracts, taking customers from signed contract to automated billing in minutes. • A fully integrated e-signature experience for quotes. When a customer is closing a deal, friction kills momentum. We rebuilt the signing experience - including embedded authentication and branded emails - into a seamless signing experience used by teams at the top tech companies every day. • Role-based access controls across the product. Different companies have different structures, but they all need tight control over who can approve deals or access sensitive data. This meant designing a flexible RBAC model that handles resources across every API endpoint and UI surface. • See more of what we’ve shipped in our public changelog. • You should apply if • You're a builder who wants to solve problems end-to-end: • You've shipped production backend systems and care about the difference between "it works" and "it's reliable" • You care about customers - you want to understand why you're building something, not just what • You’re comfortable with ambiguity. You thrive in early ideation stages, share work-in-progress to gather feedback, and adapt easily based on input • You communicate clearly. Thoughtful communication is a superpower that sharpens how we collaborate and build • You're interested in distributed systems and writing resilient software • Nice to have: Deep relational database expertise. We do a lot of complex queries and care about performance. • This might not be right if • We're a small team moving fast on hard problems. That might not be a fit if you: • Enjoy larger organisation structures and staying only within your area of expertise. Taking ownership here means doing whatever the problem needs • Want a traditional engineering team set up, with a predictable roadmap and clearly scoped out tickets provided for you • Prefer a slower pace. Customers are depending on what we ship • Aren't comfortable with production responsibility. We're revenue-critical infrastructure - on-call matters here