Senior Backend Engineer | AI Platform

Hey! We're Plum, your smart saving and investing app on a mission to help grow money for life. Whether you're stashing the cash for tea and toast in your first home or catching some rays during retirement, Plum's got your back. Since 2016, over 2 million people in 10 European markets have set aside more than £2 billion with our clever automation and AI - that's the magic of Plum! As recognition for our work, we've received awards from the likes of Deloitte, Finder, and more. That's all down to our passionate team of 200+ Plumsters, who work around Europe to help us achieve our mission. And now we're looking for more brilliant people to join us on our journey. The Role As part of the AI Platform team, you will play a key role in building the foundational infrastructure, frameworks, and tooling that enable AI-powered products and capabilities across the organization. This role requires a high degree of autonomy and ownership, as you'll be responsible for designing scalable solutions that empower multiple engineering teams while ensuring reliability, observability, and cost efficiency. What are we looking for: 5+ years of experience in Software Engineering, Backend Engineering, or Platform EngineeringStrong experience building and maintaining backend systems and distributed services in production environmentsExperience designing developer platforms, internal tooling, shared services, or infrastructure that supports multiple engineering teamsHands-on experience building AI-powered applications and services using modern LLM frameworks and agentic architecturesGood understanding of modern AI concepts and practices, including:Large Language Models (LLMs)Retrieval-Augmented Generation (RAG)Prompt EngineeringAI GuardrailsAI Evaluation FrameworksExperience with AI frameworks such as Agent Development Kit (ADK), LangChain, LangGraph, CrewAI, or similarExperience working with cloud platforms such as Google Cloud Platform (preferred), AWS, or AzureStrong understanding of system reliability, observability, monitoring, and incident managementExperience with Infrastructure as Code and cloud-native architecturesPrevious experience working within a Platform Engineering team is a strong plusKey responsibilities: Design, build, and maintain a robust, scalable, and cost-effective AI Platform that supports AI initiatives across the organizationDevelop and maintain internal frameworks, libraries, and services used by multiple product squadsEstablish and promote best practices around prompt engineering, AI guardrails, and AI evaluation methodologiesBuild platform capabilities that enable teams to safely deploy, monitor, and iterate on AI-powered applicationsConfigure and maintain tracing, monitoring, observability, and incident management solutions to ensure platform reliabilityPartner closely with product and engineering teams to understand their needs and provide scalable platform solutionsContinuously improve developer experience and platform adoption across the organizationTech Stack: Backend PythonFastAPIAgent Development Kit (ADK)Datastores PostgreSQLBigQueryFirestoreInfrastructure Google Cloud Platform (GCP)RabbitMQTerraformMonitoring & Observability GrafanaPrometheusLangfuseincident.ioSentryWhat to Expect from Our Hiring Process At Plum, we value a lot the time you devote to the hiring process, this is why we are always trying to make the process as fast and smooth as possible. 30 min. Call with ourTalent Acquisition Team. So we understand better your career plan, tell you more about Plum and the role ⚙️45 min. Call with our Engineering Lead. Brief technical discussion about the role and your skills 🏄120 min. Live Coding Call with our Engineers, including System Design exercise and an Implementation phase🧑‍💻30 min. TeamCall with a Product Manager and a Senior Manager from Engineering, for you to understand the business and envision yourself as part of Plum 🧬 Offer 💵Plum's Perks Own part of the company you're helping grow through stock optionsPrivate health insuranceAnnual training budgetPlum Premium for freeCompetitive referral schemeFlexible approach to remote working: we encourage at least 2 days a week in one of our beautiful offices in London, Athens or CyprusTeam breakfasts and team lunches25 days holiday + bank holidays45 work-from-anywhere days to give you flexibility to work your way2 weeks sabbatical after 4 years to take the break you deserveEnhanced parental leave1 paid volunteering day annuallyAnnual team trip to a surprise destination!A fun, inclusive company culture (think 🦄🌈💯)If you think this sounds like you, don't hesitate to get in touch! Thanks, Plum Τeam 💜 *Plum is an Equal Opportunity Employer. Plum does not discriminate on the basis of age, race, religion, sex, gender identity, sexual orientation, non-disqualifying physical or mental disability, national origin or any other basis covered by appropriate law. All employment is decided on the basis of qualifications, merit and business need