Senior Software Engineer - Aveni

Aveni is redefining how financial institutions use AI by building real, production-ready agentic systems that replace fragmented processes with intelligent, end-to-end workflows. Recognised as Fintech of the Year for two consecutive years and backed by leading investors, we are scaling our engineering team to meet rapidly accelerating demand.

As a Senior Software Engineer, you will build and scale 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.

Your Role & Focus

• 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

Tech Stack & Tools

• Backend: Node.js, TypeScript, NestJS (or equivalent back-end frameworks)
• Frontend: React and modern front-end tooling
• Cloud & Infrastructure: AWS (Lambda, ECS/Fargate, API Gateway, SQS/SNS, DynamoDB, RDS), microservices, and event-driven architectures
• AI & Productivity: Active use of AI coding assistants (such as Claude Code)

What We're Looking For

• Experience building production systems using Node.js / TypeScript
• Hands-on experience developing UIs with React
• Solid understanding of cloud-native engineering on AWS
• Experience with microservices, messaging patterns and distributed systems
• A commitment to clean code, testing, observability and operational excellence
• A proactive and motivated mindset — someone who wants to build, ship and iterate quickly
• Interest in AI-powered products and a drive to learn

Benefits & Perks

• Remote-first working across the UK with a work abroad policy
• Co-working spaces available if you want an office buzz sometimes
• 34 days holiday (including flexible bank holidays) and your birthday off
• Company-wide off-sites
• Optional Personal Development Plan and flexible benefits platform
• Protection essentials: Life Insurance, Income protection, critical illness cover, and Pension (up to 5% matched employer contribution)
• Private health and dental care
• Potential share options
• Enhanced family leave