Epsilon is building the next-generation Retail Media Network (RMN) platform to power onsite advertising at scale; leveraging services from our industry-leading ad tech platform that already delivers billions of offsite ads across the open web. Our vision is a unified platform that seamlessly supports both onsite and offsite advertising with low latency, high throughput, and high reliability. We're looking for a Lead Software Engineer to join our Core Platform Engineering team-a hands-on technical leader who can drive major initiatives end to end. You'll design and build scalable backend services, guide technical decisions across teams, and mentor engineers to ensure we deliver resilient, high-performance systems. Ideal for those who thrive in accountable settings, blending planning with technical tasks, and enjoy crafting global systems.