Senior Frontend Engineer

Rush Street Interactive (NYSE: RSI) is a market leader in online casino and sports betting, currently operating real-money gaming with our brands: BetRivers.com, PlaySugarHouse.com, and RushBet.co. We’re building bridges between online, social and land-based gaming businesses to create amazing, integrated experiences that keep players in the game. We are a mobile-first organization evolving our digital platform toward a modern, scalable, event-driven architecture. As a Sr. Front End Engineer, you will play a foundational role in building and evolving our client applications and the event orchestration architecture that powers them. This role extends beyond traditional feature development. You will help architect and implement scalable client-side instrumentation frameworks, shared frontend capabilities, and integration patterns that enable structured event collection, analytics, lifecycle engagement, and downstream data systems. You will work in close coordination with feature-delivery teams to ensure instrumentation and orchestration standards are embedded directly into product development. In parallel, you will help shape the long-term evolution of our client event architecture. This position requires deep frontend and mobile expertise combined with systems thinking, architectural rigor, and a strong understanding of scalable event-driven systems. What You'll Do: Client & Mobile Engineering Frontend development across web and native mobile platforms (React, Angular, TypeScript, iOS, Android). Contribute to and evolve a modular, scalable micro-frontend architecture. Build reusable frontend components and shared client frameworks. Optimize performance and responsiveness across devices, with particular focus on mobile reliability and efficiency. Establish best practices for SDK integrations, consent enforcement, observability, and client performance. Event Instrumentation & Orchestration Design and implement structured event instrumentation frameworks across web and