Sequence
Senior Product Engineer (Backend) - London
1mo ago
115000 –130000 / yearEuropeSeniorRemotebackendaiworkflowsoftware development
Build and own backend systems for an AI-powered revenue platform handling quoting, billing, and revenue recognition.
Responsibilities
- 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.
Conditions
- Salary: £115,000 - £130,000
- Equity: Meaningful share options
- 25 days holiday + bank holidays
- Modern, flexible pension via Penfold with salary sacrifice available
- Visa sponsorship available
How to apply
- We move fast - typically 2 weeks start to finish. We've written a detailed blog post about the process with tips for how to prepare.
Other
- If you join Sequence, you'll help build the platform that lets companies get paid - we’re already processing $1bn+ in annual invoice volume and growing fast.
- We're building the AI-powered revenue platform for modern finance teams, replacing fragile spreadsheets and legacy systems with software their teams love using.
- Cognition, incident.io, MoonPay, and 100+ other high-growth companies trust us to handle their entire revenue cycle across quoting, billing, and revenue recognition.
- Founded by repeat entrepreneurs, we hit 10x ARR growth last year and just closed a $20M Series A led by 645 Ventures, alongside a16z and exceptional founders and CFOs from companies like Decagon, Klaviyo and Wise.
- 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.
- 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'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.
- 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
- We hire for ability, not a specific tech stack. Most of the team learned our stack 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
- Read our engineering principles
- We’re based in London and New York and love spending as much time with our colleagues as possible. We spend three days together in the office, with team lunch on Wednesdays.
- You'll join a cross-functional product team working directly with design and product. We get together twice a year for company offsites.
- Podcasts:
- Wharton FinTech: Reinventing Billing & Quote-to-cash (Dec 2025): origin story, why Riya built Sequence after her first exit.
- Tech Finance with Sasha Orloff: E14: Revenue Models 101 & the New Stack : pricing/revenue models, quote-to-cash thesis.
- Riding Unicorns: S6E5 ( written recap ): M&A, founding story, enterprise product views.
- Bae HQ: Episode 207 : a16z round, category vision.
- The SaaS CFO with Ben Murray : AI-native B2B billing pitch.
- Converge Podcast (May 2024): "financial router" framing.
- Transcript of the Wharton FinTech episode if you want to skim rather than listen.
- Written:
- USXP: From Oxford to a16z: building a US-first mindset at Sequence : go-to-market and US expansion.
- The FP&A Guy: How modern finance teams are automating billing with AI : guest piece on AI in finance ops.
- Sequence blog: Introducing Sequence 2.0 : her launch post for the AI-native rebuild.