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# Senior Backend Engineer (up to £175k)

- **Company:** Dex
- **Location:** Greater London, UK
- **Experience:** Expert
- **Salary:** £175,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Microsoft Azure, Cloud Computing, Distributed Systems, Python (Programming Language), PostgreSQL, Message Broker, Query Optimization, Database Optimization, Backend, Fastapi, Event Driven Architecture, Kubernetes, Apache Kafka, Celery, Restful APIs, Data Pipelines, Docker, Microservices
- **Published:** September 9, 2026
- **Apply:** https://www.collegerecruiter.com/job/2856363536-senior-backend-engineer-up-to-175k

## About the Role

* 7+ years of backend engineering experience, with a track record of building and scaling production systems.
 * Expert-level Python, modern web frameworks (FastAPI), and deep expertise in PostgreSQL query optimisation and scaling.
 * Experience with event-driven architectures, message brokers (e.g., Celery, Kafka), and designing clean REST APIs and microservices.
 * Strong fundamentals in distributed systems, cloud platforms (Azure preferred), Docker/Kubernetes, and security (authn/authz, encryption).
 * Experience shipping software in regulated environments (SOC 2, GDPR, FCA) is a significant advantage.

## Description

* Architect and build scalable backend services and APIs for an AI workspace handling sensitive financial data.
 * Design and implement high-performance data pipelines to process large-scale financial datasets with strict accuracy and latency requirements.
 * Optimise database schemas, queries, and indexing strategies for PostgreSQL in a high-throughput, distributed environment.
 * Partner with ML engineers to productionise models, integrating them seamlessly into robust backend systems.
 * Lead technical design reviews, mentor engineers, and contribute to shaping the engineering culture as the platform scales.


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