We're looking for a Mid/Senior Product Engineer with strong backend skills to join our team.

What's it like to work at Sequence?

Small team, big opportunity, real ownership. You'll do work that matters, have direct access to customers, and grow alongside the company.

If you want to do the best work of your career at a company that's scaling fast, we'd love to meet you.

What you'll be doing

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 [https://www.sequencehq.com/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

Tech stack

We hire for ability, not a specific tech stack. Most of the team learned Kotlin here:

• Backend: Kotlin (modular monolith using Http4k, Spring Boot, Exposed, Result4k)

• Storage: Postgres, BigQuery

• Async messaging: Google Cloud Pub/Sub

• Infrastructure: Google Cloud, Terraform

• Frontend: TypeScript, React

• Monitoring: Google Cloud Monitoring, Sentry

• Tools: GitHub, Slack, Notion, Linear