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 TypeScriptDevelop trading interfaces, live positions, settlement views, wallet and payout flows, identity and verification journeys, and promotionsBuild real-time interfaces using live data feeds and WebSockets that remain reliable under live market conditionsBuild 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 surfacesDevelop and contribute to the shared web and React Native design systemEnsure consistent experiences across web and mobile, including design tokens, touch targets, and live-ticking numerals in fixed-width slotsWork across internal and partner-maintained frontend codebases and review partner work to a high standardMaintain strong frontend architecture and appropriate boundaries between ROLR and external platform providersBuild and improve internal back-office tools and operational dashboardsMonitor and improve frontend performance, including Core Web Vitals on web and cold start and frame time on nativeSupport code reviews, architecture discussions, and mentoring across the engineering team You’ll need to: Have 5–7 years of professional frontend engineering experienceHave deep React experience and strong TypeScript and JavaScript skillsHave experience building complex production web applicationsHave experience with real-time interfaces, WebSockets, or streaming dataHave implemented authentication in production, including OAuth 2.0 / OIDC flows, token lifecycle, and secure session handlingHave experience building accessible interfaces (WCAG 2.1 AA)Have strong HTML, CSS, responsive design, and API integration experienceHave strong debugging and frontend performance skillsBe comfortable working across Product, Design, Backend, QA, and ComplianceBe based in New York and work out of our New York office Preferred Experience React Native in production, strongly preferred given our flagship mobile productDesign systems, tokens, theming, and component librariesKeycloak or comparable identity platforms, passkeys / WebAuthn, and biometric unlockReal-time market data or trading interfacesFintech, trading, prediction markets, or another regulated industryInternal/admin tooling frameworks and frontend observability, such as Sentry or Datadog RUMAI-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 qualificationsCompetitive health and welfare benefits401(k) retirement plan with company matchFlexible vacation policyHome office setup reimbursementAccess to mental health support