Staff Backend Engineer — AI Finance Platform

Dex; Greater London; On-site; GBP 140,000 - 190,000; Full time

Job summary

Dex is building an AI workspace for sensitive financial data with SOC 2, GDPR, and FCA compliance. Join a lean senior backend team, owning end-to-end critical systems and data pipelines while working closely with founders.

You will architect scalable services, optimize databases, and collaborate with ML teams to productionise models, helping the platform scale and influence engineering culture.

Qualifications

• 7+ years of backend engineering experience in production systems.
• Expert-level Python with FastAPI and PostgreSQL tuning.
• Experience with event-driven architectures and brokers like Kafka/Celery.
• Strong cloud, Docker/Kubernetes, and security fundamentals.
• Experience in regulated environments (SOC 2, GDPR, FCA) is a plus.

Responsibilities

• Architect and build scalable backend services and APIs for an AI workspace handling sensitive data.
• Design and implement high-performance data pipelines for large financial datasets.
• Optimise PostgreSQL schemas, queries, and indexing for high throughput.
• Collaborate with ML engineers to productionise models in robust backends.
• Lead design reviews, mentor engineers, and shape engineering culture at scale.

Skills

Python

FastAPI

PostgreSQL

Query optimisation

Distributed systems

Cloud platforms

Docker/Kubernetes

Security

Event-driven architectures

Kafka

Tools

Docker

Kubernetes

Azure

Job description

Dex is building an AI workspace for sensitive financial data with SOC 2, GDPR, and FCA compliance. Join a lean senior backend team, owning end-to-end critical systems and data pipelines while working closely with founders.

You will architect scalable services, optimize databases, and collaborate with ML teams to productionise models, helping the platform scale and influence engineering culture.