Senior AI Software Engineer – Remote (UK) | LLMs, FinTech & AWS

Harrington Starr; United States; Remote; GBP 120,000 - 160,000; Full time

Benefits offered by this job

Fully remote UK-wide

Flexible working

Learning & career development

Private healthcare

Enhanced holiday allowance

Share option potential

Shape cutting-edge AI products

Job summary

Harrington Starr partners with an innovative fintech AI specialist to hire a Senior AI Software Engineer. You will own AI feature delivery from concept to production, designing platforms, services, and user interfaces that integrate LLMs and agentic workflows.

Lead backend and frontend work using Node.js/TypeScript and React, with a strong cloud-native focus on AWS. Mentoring engineers and driving observability and best practices are key parts of the role.

Qualifications

• Experience building AI-enabled production systems for financial services is a plus.
• Strong backend with Node.js/TypeScript and React experience.
• Proven ability to ship end-to-end AI-powered features in production.

Responsibilities

• Build AI-powered products using LLMs, RAG, and agentic workflows in production.
• Develop backend services and APIs with Node.js/TypeScript and NestJS.
• Create modern React UIs that embed AI into user workflows.
• Lead design of cloud-native solutions on AWS and monitor AI systems.

Skills

Node.js

TypeScript

React

AWS

Microservices

API design

NLP/LLMs

Prompt engineering

Team mentorship

Observability

NestJS

LangGraph

Langfuse

Tools

NestJS

LangGraph

Langfuse

AWS

Job description

Harrington Starr partners with an innovative fintech AI specialist to hire a Senior AI Software Engineer. You will own AI feature delivery from concept to production, designing platforms, services, and user interfaces that integrate LLMs and agentic workflows.

Lead backend and frontend work using Node.js/TypeScript and React, with a strong cloud-native focus on AWS. Mentoring engineers and driving observability and best practices are key parts of the role.