Senior Backend Engineer - AI Platform & Scalable Infra

Plum; Greater London; Hybrid; GBP 110,000 - 140,000; Full time

Benefits offered by this job

Stock options

Private health insurance

Annual training budget

Remote-friendly with London Athens Cy

Office presence in London

Job summary

Plum is seeking an experienced AI Platform Engineer to build and maintain scalable infrastructure supporting AI-powered products across the company. You’ll own and evolve internal frameworks and services used by multiple product squads.

You will establish best practices for prompt engineering, AI guardrails, and evaluation methodologies, ensuring safe deployment, monitoring, and iteration of AI applications. A strong focus on observability and cost efficiency guides this role.

Qualifications

• 5+ years of experience in Software/Backend/Platform Engineering.
• Experience building backend systems and distributed services in production.
• Experience designing developer platforms and internal tooling for multiple teams.
• Hands-on experience building AI-powered applications using modern LLM frameworks.
• Good understanding of LLMs, Retrieval-Augmented Generation (RAG), Prompt Engineering, AI Guardrails and Evaluation frameworks.
• Experience with AI frameworks such as ADK, LangChain, LangGraph, CrewAI or similar.
• Experience with cloud platforms such as Google Cloud Platform (GCP), AWS, or Azure.
• Strong understanding of observability, monitoring, and incident management.
• Experience with Infrastructure as Code and cloud-native architectures.
• Previous experience in a Platform Engineering team is a plus.

Responsibilities

• Design, build, and maintain a robust, scalable AI Platform supporting AI initiatives across Plum.
• Develop and maintain internal frameworks, libraries, and services used by multiple product squads.
• Promote best practices around prompt engineering, AI guardrails, and evaluation methodologies.
• Build platform capabilities to safely deploy, monitor, and iterate on AI-powered apps.
• Configure and maintain tracing, monitoring, observability, and incident management solutions for platform reliability.
• Collaborate with product and engineering teams to understand needs and provide scalable platform solutions.
• Continuously improve developer experience and platform adoption across the organization.

Skills

Backend Engineering

Distributed Systems

AI Platform

LLM Frameworks

LangChain

ADK

Cloud Platforms

Observability

Incident Management

Infra as Code

Tools

ADK

LangChain

LangGraph

CrewAI

GCP

PostgreSQL

BigQuery

Firestore

Job description

Plum is seeking an experienced AI Platform Engineer to build and maintain scalable infrastructure supporting AI-powered products across the company. You’ll own and evolve internal frameworks and services used by multiple product squads.

You will establish best practices for prompt engineering, AI guardrails, and evaluation methodologies, ensuring safe deployment, monitoring, and iteration of AI applications. A strong focus on observability and cost efficiency guides this role.