Senior ML Platform Engineer (GenAI Platform)

The role

You will design and build systems behind production GenAI workloads. You will drive the expansion of the GenAI Platform and turn engineering needs into self-service capabilities.

What you will do

• Architect unified gateway with automated routing, quota controls, and resilient fallback systems
• Drive system efficiency and low latency via traffic management, caching, and cost controls
• Establish evaluation mechanisms for model outputs
• Deliver system observability including tracing, telemetry, and monitoring
• Standardize prompt engineering workflows with versioning, testing, and CI/CD
• Embed platform guardrails to enforce policies and safe production defaults
• Maintain incident response, postmortems, and monitoring for GenAI stacks

Required qualifications

• 5+ years designing, building and operating backend services or ML infrastructure
• Strong Python skills
• Experience building developer-facing APIs/SDKs or shared libraries
• Practical experience with GenAI systems, vector retrieval, and external provider APIs
• Hands-on experience with Agentic AI
• Sound knowledge of distributed systems, high availability, concurrency, caching and rate limiting
• Experience with at least one major public cloud, preferably AWS
• Hands-on experience with distributed tracing, system telemetry, SLOs, and incident triage
• Strong communication skills
• C1 English level

Nice to have

• Experience operating AI gateways or scalable model serving infrastructure
• Familiarity with evaluation suites, prompt management, vector databases, or customized GenAI observability tooling
• Experience with Metaflow, Databricks, or AWS SageMaker
• Knowledge of hosting open-source foundation models, optimizing GPU compute, dynamic scaling, and infrastructure cost controls
• Familiarity with agentic workflows, multi-agent frameworks and tool-use patterns

Benefits

• Monthly allowance for lessons on Preply.com
• Learning & Development budget
• Time off for self-development
• Competitive financial package with equity
• Leave allowance
• Health insurance
• Relocation package to join the Preply Barcelona Hub
• Free mental health support platforms
• Access to Gympass-partnered wellness and gym centers throughout Spain

About the company

Preply is a category-defining company that helps people discover tutors and craft personalised learning journeys. They have reached unicorn status with a $150M Series D.