Senior Frontend Engineer

About Rolr ROLR is building a prediction markets platform delivering the frontier of trading on sports, culture, economics, AI, commodities, and geopolitics. You'll be on a nimble startup-like team within a public company. Our customer experience spans mobile and web, from markets and live trading interfaces to onboarding, identity, payments, and operational tools. Our differentiation lives before the cashier: the game, the graph, and the notification. The consumer surface is the asset we own outright under every scenario, and this role will play a key part in building it. Role Overview We're looking for a Senior Frontend Engineer to join our team in New York and build the customer-facing experience of our prediction markets platform across web and mobile. You'll work across React, React Native, and TypeScript, building complex real-time consumer experiences with significant ownership from idea through production. This is not a role focused simply on implementing tickets. We're looking for engineers who think like product builders. Key Responsibilities Design and build customer-facing experiences using React, React Native, and TypeScript Develop trading interfaces, live positions, settlement views, wallet and payout flows, identity and verification journeys, and promotions Build real-time interfaces using live data feeds and WebSockets that remain reliable under live market conditions Build sign-up, sign-in, and session flows against our Keycloak-standardized identity platform: OAuth 2.0 / OIDC with PKCE, token lifecycle, passkeys (WebAuthn), and biometric step-up on native surfaces Develop and contribute to the shared web and React Native design system Ensure consistent experiences across web and mobile, including design tokens, touch targets, and live-ticking numerals in fixed-width slots Work across internal and partner-maintained frontend codebases and review partner work to a high standard Maintain strong frontend architecture and appropriate boundaries between ROLR and external platform providers Build and improve internal back-office tools and operational dashboards Monitor and improve frontend performance, including Core Web Vitals on web and cold start and frame time on native Support code reviews, architecture discussions, and mentoring across the engineering team You’ll need to: Have 5–7 years of professional frontend engineering experience Have deep React experience and strong TypeScript and JavaScript skills Have experience building complex production web applications Have experience with real-time interfaces, WebSockets, or streaming data Have implemented authentication in production, including OAuth 2.0 / OIDC flows, token lifecycle, and secure session handling Have experience building accessible interfaces (WCAG 2.1 AA) Have strong HTML, CSS, responsive design, and API integration experience Have strong debugging and frontend performance skills Be comfortable working across Product, Design, Backend, QA, and Compliance Be based in New York and work out of our New York office Preferred Experience React Native in production, strongly preferred given our flagship mobile product Design systems, tokens, theming, and component libraries Keycloak or comparable identity platforms, passkeys / WebAuthn, and biometric unlock Real-time market data or trading interfaces Fintech, trading, prediction markets, or another regulated industry Internal/admin tooling frameworks and frontend observability, such as Sentry or Datadog RUM AI-native engineering workflows, including agentic coding and AI-assisted testing and review What We Offer Base salary range: $180,000–$240,000 per year. Offers will be positioned within the range based on experience and qualifications Competitive health and welfare benefits 401(k) retirement plan with company match Flexible vacation policy Home office setup reimbursement Access to mental health support