Lead Backend Engineer for AI-Driven Fintech Platform

Jack & Jill; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Jack & Jill in London, UK, is seeking a Senior Backend Engineer to lead the development of high-performance backend systems for an AI-native fintech platform serving major financial institutions. You will own scalable infrastructure and agentic workflows, enabling complex data processing and investment intelligence at scale.

You will design and implement scalable backend services, build distributed pipelines and search infrastructure, and collaborate with product and AI teams to integrate large

Qualifications

• 5+ years of experience building and operating production-grade backend systems at a venture-backed startup or top-tier technology company.
• Deep expertise in Python, distributed systems, and modern database technologies like Postgres or messaging queues.
• Thrives in high-autonomy environments with a proven track record of delivering complex features to production.

Responsibilities

• Design and implement scalable backend services using Python and modern web frameworks to support long-running AI workflows.
• Build and maintain distributed data pipelines and search infrastructure for large-scale document processing and real-time data extraction.
• Collaborate with product and AI teams to integrate large language models into core platform features for reliability and performance.

Skills

Python

Distributed systems

PostgreSQL

Messaging queues

Autonomy

Job description

Jack & Jill in London, UK, is seeking a Senior Backend Engineer to lead the development of high-performance backend systems for an AI-native fintech platform serving major financial institutions. You will own scalable infrastructure and agentic workflows, enabling complex data processing and investment intelligence at scale.

You will design and implement scalable backend services, build distributed pipelines and search infrastructure, and collaborate with product and AI teams to integrate large