Lead Software Engineer - Aveni

Aveni is redefining how financial institutions use AI, building real, production-ready agentic systems that reshape how banks, advisers, and financial services firms operate. Recognized as Fintech of the Year for two consecutive years, we are scaling our engineering organisation to meet rapid growth.

The Role

We're looking for a Lead AI Software Engineer to be the most senior technical voice in one of our product squads, working as a technical co-leader alongside the Engineering Manager. You'll own the squad's technical direction and engineering quality end-to-end, from architectural decision-making and hands-on delivery to mentoring engineers.

What You'll Be Doing

• Setting technical direction for your squad, owning architectural decisions, managing technical risk, and representing engineering at our Architecture Review Board.
• Driving adoption of AI coding tools across the full SDLC, from planning and design through code review, testing, and deployment.
• Delivering production-grade code across the full stack: Node.js or Python backends, event-driven AWS architecture, and React where needed.
• Mentoring and growing engineers across AI and full-stack domains through code reviews, design documents, and day-to-day pairing.
• Collaborating with platform teams to consume shared capabilities and contribute reusable patterns back.
• Ensuring everything we ship is compliant-by-design, auditable, and built to the standards expected in FCA regulated financial services.

What We're Looking For

• Seasoned engineer with 10+ years of experience, including meaningful time building and operating AI systems in production.
• Real technical leadership experience: setting direction, making architectural calls, and mentoring others.
• Strong hands-on AI/LLM skills: prompt engineering, RAG, model evaluation, and agent frameworks.
• Deep expertise in TypeScript and Node.js, with solid experience in React and Python.
• Cloud-native development experience on AWS (serverless, event-driven, Lambda).
• Instinct for building responsibly with a focus on auditability and compliance.

Benefits

• Remote-first working across the UK with a work abroad policy.
• Co-working spaces available.
• 34 days holiday (including flexible bank holidays) and your birthday off.
• Company-wide off-sites.
• Optional Personal Development Plan and flexible benefits platform.
• Life insurance, income protection, critical illness cover, and matched pension contribution up to 5%.
• Private health and dental care.
• Potential share options and enhanced family leave.