Senior Software Engineer

As a Senior Software Engineer at Aveni, you’ll be responsible for building and scaling the products that sit on top of FinLLM (the UK's first LLM for the Financial Services industry) and other LLMs, enabling financial institutions to adopt AI safely and effectively.

You won’t be expected to build or train the LLMs themselves, instead you’ll be engineering the platforms, services, user interfaces and integrations that bring those models to life in the hands of advisers, analysts and banking teams.

Designing and implementing robust event-driven microservices and APIs

Building scalable, cloud-native systems on AWS

Developing modern, responsive React front-ends

Integrating LLM-powered capabilities into real-world workflows

Collaborating closely with product and AI specialists to turn ideas into reliable, customer-ready features

You should be comfortable with most of our core technologies:

Node.js and TypeScript

React and modern front-end tooling

AWS (e.g., Lambda, ECS/Fargate, API Gateway, SQS/SNS, DynamoDB, RDS)

NestJS or equivalent back-end frameworks

Microservices and event-driven architectures

We also actively embrace AI coding assistants (such as Claude Code) to speed up development, improve code quality and reduce repetitive work — and we encourage engineers to use these tools effectively.