System Operations Engineer in Madrid

Freelance | 8–20 hrs/week | Remote (EU/UK) Are you a senior employer branding expert who can quickly spot messaging gaps and translate real-world branding challenges into actionable insights? Do you have 8–20 hours per week to dedicate alongside your current work? Join our…

Freelance | 8–20 hrs/week | Remote (EU/UK) Pricing Manager – AI Trainer (Freelance, 8–20 hrs/week, Remote EU/UK) Are you a seasoned professional in pricing strategy, quantitative analysis, or financial modeling? Are you interested in helping shape the future of artificial…

About us Sierra is the leading platform for customer-facing AI agents, working with many of the world's biggest brands — including The GAP, Rocket Mortgage, SoFi, Sutter Health, and SoftBank — to transform how they serve customers and grow their businesses. We are primarily an…