Senior AI/ML Engineer - AI Platform

About the role

Plum is building an AI-powered proactive money platform and is hiring a Senior AI/ML Engineer for its AI Platform team. You will build the foundational infrastructure, frameworks and tooling that enable AI-powered products across the organisation, with a high degree of autonomy and ownership. The role is open to candidates who want to design scalable solutions that support multiple engineering teams while ensuring reliability, observability and cost efficiency.

Key responsibilities

• Design, build and maintain a robust, scalable and cost-effective AI Platform supporting AI initiatives across the organisation
• Develop and maintain internal frameworks, libraries and services used by multiple product squads
• Establish and promote best practices around prompt engineering, AI guardrails and AI evaluation methodologies
• Build platform capabilities that let teams safely deploy, monitor and iterate on AI-powered applications
• Configure and maintain tracing, monitoring, observability and incident management solutions
• Work closely with product and engineering teams to deliver scalable platform solutions
• Improve developer experience and platform adoption

Required profile

• 5+ years of experience in software, backend or platform engineering
• Strong experience building and maintaining backend systems and distributed services in production
• Experience designing developer platforms, internal tooling, shared services or infrastructure for multiple teams
• Hands-on experience building AI-powered applications with modern LLM frameworks and agentic architectures
• Experience with cloud platforms (Google Cloud Platform preferred, AWS or Azure)
• Understanding of system reliability, observability, monitoring and incident management
• Experience with Infrastructure as Code and cloud-native architectures; previous platform engineering experience is a strong plus

Required skills

• Python and FastAPI
• LLM frameworks such as ADK, LangChain, LangGraph, CrewAI
• PostgreSQL, BigQuery, Firestore
• RabbitMQ, Terraform
• Grafana, Prometheus, Langfuse, Sentry, incident.io
• Prompt engineering, RAG, AI guardrails and AI evaluation

What we offer

• Stock options and private health insurance
• Annual training budget and Plum Premium for free
• Flexible remote approach, with at least 2 days a week in London, Athens or Cyprus
• 25 days holiday plus bank holidays and 45 work-from-anywhere days
• 2 weeks sabbatical after 4 years, enhanced parental leave and 1 paid volunteering day
• Team breakfasts, lunches and an annual team trip