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, 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
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 at Aveni. What you’ll love:
Remote-first working across the UK
34 days holiday (including flexible
Senior Software Engineer (Python) in London employer: Aveni
Aveni is an exceptional employer, offering a dynamic and inclusive work culture that empowers employees to tackle meaningful challenges at the forefront of AI and financial services. With a remote-first approach across the UK, employees benefit from flexible working arrangements, comprehensive personal development plans, and a supportive environment that fosters growth and innovation. Join us to make a significant impact in a rapidly evolving industry while enjoying competitive benefits and a strong commitment to diversity.
