Senior Backend Engineer (+ Equity) at Saturnos

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Job Title Senior Backend Engineer

Salary Not Disclosed

Company Description Saturnos.com is a Series A-backed fintech and Y Combinator alum transforming financial advice infrastructure, managing $500bn in assets for 9,000+ regulated professionals.

Job Description Join Saturnos.com to architect backend systems at the intersection of distributed systems, AI, and regulated financial infrastructure. You will own platform capabilities from design to production, building event-driven architectures with Kafka and Go to scale services from independent firms to major global institutions while defining the future of wealth management technology.

Location London, UK

Why this role is remarkable

• Join a Y Combinator 2024 breakout that is already the UK leader in AI transformation for financial advice, following a major acquisition of a legacy industry giant.
• Work on technically complex infrastructure involving $500bn in assets, where you will define the patterns for high-integrity, event-driven financial systems that do not yet exist.
• Collaborate with a high-calibre engineering team featuring early members from Rippling, Postman, and Gojek in a brand-new five-story office featuring an on-site gym.

What You Will Do

• Design and own significant backend services and platform capabilities using Go, TypeScript, and Kafka-based event-driven architectures to process high volumes of financial data.
• Architect reliable, long-running workflows that preserve provenance and auditability across complex financial households, products, and regulatory controls.
• Build the critical interfaces and data pipelines that provide reliable, permissioned context to Saturnos.com’s AI platform, enabling automated compliance and investment research.

The ideal candidate

• Brings 5+ years of experience building and operating production backend systems, with deep expertise in Go, TypeScript, or similar languages for distributed environments.
• Demonstrates a strong command of Kafka or equivalent messaging systems, specifically regarding ordering, idempotency, and handling partial failures in mission-critical workflows.
• Has a track record of modeling complex, data-critical systems across SQL/NoSQL and ideally experience in regulated domains like fintech, healthcare, or legal.

Who are Jack & Jill? Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

How does this work?

• Jack's an AI agent for job searching and career coaching. He works for you.
• Jill is the AI recruiter working for the company. She recruits from Jack's network.
• If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.

We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.

We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

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