Experteer Overview You join Preply to scale and safeguard GenAI-powered learning experiences. As a senior engineer on the GenAI Platform team, you design and expand systems that run production GenAI workloads, partnering with data, security, and product teams. You shape platform abstractions, promote self-service capabilities, and drive reliable, low-latency delivery with strong observability and governance. This role combines hands-on coding with architectural influence to impact millions of learners and tutors globally. Compensaciones / Ventajas • Architect unified gateway with automated routing, quotas, and robust fallback across model vendors • Improve efficiency and reduce latency via dynamic traffic, caching, and cost allocation controls • Establish evaluation mechanisms ensuring precision, stability, and safety of model outputs • Deliver comprehensive observability: tracing, telemetry, cost analytics, monitoring, and alerts across GenAI lifecycles • Standardize prompt engineering with versioning, automated testing, governance,



and CI/CD for production delivery • Implement platform guardrails with Security/Privacy teams for safe defaults and policies • Maintain incident response and blameless postmortems with thorough GenAI stack monitoring Responsabilidades • 5+ years designing and operating backend services or ML infrastructure with production traffic • Strong Python skills and experience building developer-facing APIs/SDKs • Hands-on experience with GenAI systems including vector retrieval and external provider APIs • Knowledge of distributed systems (high availability, concurrency, caching, rate limiting) • Experience with at least one major public cloud (preferably AWS) • Experience with distributed tracing, telemetry, SLOs, and incident triage • Excellent communication and English proficiency (C1), willingness for on-call rotation Requisitos principales • lesson budget and development stipend • health insurance • relocation package to Barcelona • on-de

📌 Senior ML Platform Engineer (Barcelona)
🏢 Preply
📍 Barcelona