Backend Engineer - AI-Powered, Python & AWS (London)

Harnham - Data & Analytics Recruitment; City Of London; On-site; GBP 72,000 - 88,000; Full time

Benefits offered by this job

Contributory pension scheme

Bonus

Job summary

Harnham - Data & Analytics Recruitment is seeking a Backend Engineer in London to build scalable services and AI-powered capabilities. You will work across the full stack, integrating Java/Spring with Python-based AI services, and design secure, high-performance systems in a fast-paced environment.

The role emphasizes API design, observability, automated testing, and cloud infrastructure, with opportunities to contribute to production-ready, data-driven solutions in an early-stage tech setting.

Qualifications

• Experience building backend applications.
• Proficient Python with FastAPI desirable.
• Strong SQL and PostgreSQL expertise.
• Hands-on AWS experience with CI/CD and Linux environments.
• Knowledge of API design, testing, monitoring, observability and security.

Responsibilities

• Build, scale, and maintain backend services including APIs, workflow engines, data services, and system integrations.
• Develop integrations between Java/Spring components and Python-based AI services.
• Design secure, reliable, high-performance systems.
• Collaborate with cross-functional teams to deliver robust backend solutions.
• Implement and enhance API architectures, observability frameworks, automated testing, and security practices.
• Contribute to cloud infrastructure, CI/CD pipelines, and AWS-based operations.

Skills

Backend development

Python

FastAPI

SQL

PostgreSQL

AWS

API design

Security

Observability

AI tools

Java/Spring

LLM integrations

Tools

Cursor

Claude Code

Job description

Harnham - Data & Analytics Recruitment is seeking a Backend Engineer in London to build scalable services and AI-powered capabilities. You will work across the full stack, integrating Java/Spring with Python-based AI services, and design secure, high-performance systems in a fast-paced environment.

The role emphasizes API design, observability, automated testing, and cloud infrastructure, with opportunities to contribute to production-ready, data-driven solutions in an early-stage tech setting.