Senior Software Engineer; Python Job Luton area,England UK,Software Development

The Role

Aveni is building next-generation AI systems for UK financial services, where safety, compliance, and trust are non-negotiable. We're hiring a Senior Software Engineer to work on AI and agentic platform capabilities that power intelligent, automated workflows for financial services. This is a high-impact role building foundational technology that underpins Aveni's AI-first strategy.

What You’ll Be Doing Build Production-Grade Systems

Design and implement scalable Python services powering AI-driven workflows
Develop resilient, observable systems with strong error handling and compliance traceability
Work within a serverless, event-driven AWS architecture

Own Delivery End-to-End

Take ownership of features from design through to production
Collaborate with Product, AI Platform, and Compliance teams
Contribute to sprint planning, estimation, and delivery

Shape AI & Agentic Systems

Build intelligent workflows using LLMs and agentic architectures
Integrate AI models into production systems
Design guardrails, policy enforcement, and behavioural monitoring for AI agents

Mentor & Elevate the Team

Support and guide junior and mid-level engineers
Lead code reviews and promote engineering best practices
Contribute to documentation, demos, and knowledge sharing

Drive AI-Augmented Engineering

Use AI coding tools to accelerate development and improve quality

Requirements What We’re Looking For Must Have

Strong Python expertise in production environments
Experience building cloud-native systems on AWS (Lambda, DynamoDB, S3, Event Bridge)
Experience working with LLMs or AI/ML systems
Strong understanding of APIs, async systems, and scalable architecture

Nice to Have

Experience with AI safety, guardrails, or policy enforcement
Background in agentic systems or autonomous workflows
Experience in financial services or regulated environments
Familiarity with Node.js / Type Script, Terraform or CDK
Knowledge of observability tools and ML fundamentals

You’ll Thrive If You Are

Pragmatic and able to balance speed with long-term quality
Curious about AI, especially safety and responsible usage
Comfortable working in a fast-moving scale-up environment
A strong communicator who can explain complex ideas clearly
Passionate about mentoring and raising team standards

This role offers a clear path into Staff or Lead Engineer positions

Drive architectural decisions across multiple teams
Own complex, cross-cutting AI systems

Benefits t you’ll love:

Remote-first working across the UK
34 days holiday (including flexible bank holidays) and your birthday off
Company-wide off-sites
Optional Personal Development Plan
Flexible benefits platform
Protection essentials including Life Insurance, Income Protection, Critical Illness cover, and Pension (up to 5% matched employer contribution with optional increased contributions)