Senior Backend Engineer – AI-Driven FinTech Platform

Saturn; Greater London; Hybrid; GBP 110,000 - 140,000; Full time

Benefits offered by this job

Competitive salary

Equity package

Office in London

Dental and medical insurance

Learning budget

Gym and wellness center

Collaborative team

Job summary

Saturn is seeking a Senior Backend Engineer to own substantial backend systems from design through production. You will work with product, AI, and domain experts to build a durable platform that supports AI-driven advisory workflows and regulatory compliance.

You will contribute to event-driven architectures, robust data models and reliable integrations, ensuring correctness, observability and scalable operations for complex financial services platforms.

Qualifications

• 5+ years building backend systems with ownership of a substantial service.
• Deep experience with Go and TypeScript in production environments.
• Distributed systems using Kafka or equivalent with replay and idempotency.
• Strong data modelling across SQL and NoSQL with clear APIs.
• Design for correctness, resilience, and observability in large systems.
• Own production services, incidents and rapid improvements.
• Ability to write clear design docs and mentor others.

Responsibilities

• Event-driven architecture and Kafka-based workflows with retries and partial failures.
• Core data models spanning clients, households, assets, and advice.
• Ingestion and synchronization across CRMs and financial platforms with reconciliation.
• Backend services powering Saturn’s automated compliance and advice products.
• Interface between backend systems and Saturn’s AI platform for context and tools.
• Ensure correctness, auditability and traceability of financial workflows.
• Production ownership: observability, alerts, incident response, scalability.
• Develop shared libraries, patterns and set design review standards.

Skills

Backend systems

Go & TS

Kafka / Event-driven

Data modelling

Observability & reliability

Delivery in months

Production ownership

Written communication

Job description

Saturn is seeking a Senior Backend Engineer to own substantial backend systems from design through production. You will work with product, AI, and domain experts to build a durable platform that supports AI-driven advisory workflows and regulatory compliance.

You will contribute to event-driven architectures, robust data models and reliable integrations, ensuring correctness, observability and scalable operations for complex financial services platforms.