Senior Software Engineer (Python) - Aveni

Aveni is redefining how financial institutions use AI. We build real, production-ready agentic systems that reshape how banks, advisers and financial services firms operate, replacing fragmented processes with intelligent, end-to-end workflows.

We have been recognised as Fintech of the Year for two consecutive years and awarded Best Specialist Technology Service at the Professional Adviser Awards 2025. Backed by leading investors including Puma Private Equity, and commercially supported by Lloyds Banking Group and Nationwide Building Society, we previously completed one of Scotland’s largest Series A rounds.

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.
• Help define best practices for AI-assisted software engineering.

What We’re Looking For

Must Have

• Strong Python expertise in production environments.
• Experience building cloud-native systems on AWS (Lambda, DynamoDB, S3, EventBridge).
• 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 / TypeScript, Terraform or CDK.
• Knowledge of observability tools and ML fundamentals.

Benefits at Aveni

• Remote-first working across the UK with work abroad policy and co-working spaces available.
• 34 days holiday (including flexible bank holidays) and your birthday off.
• Company-wide off-sites and 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).
• Private health and dental care.
• Potential share options and enhanced family leave.