Senior Frontend Engineer

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 seat builds it. 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, NextJS, React Native, and TypeScript, building complex real-time consumer experiences with significant ownership from idea through production. This is not a role for someone who implements tickets. We're looking for engineers who think like product builders.

Key Responsibilities:

• Design and build customer-facing experiences using React, NextJS, 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 stay honest 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: one component API, two renderers

• Ensure consistent experiences across web and mobile: design tokens, 44pt touch targets, live-ticking numerals in fixed-width slots

• Work directly across internal and partner-maintained frontend codebases, and review partner work to your own standard

• Maintain strong frontend architecture and appropriate boundaries between ROLR and external platform providers

• Develop and grow the BFF layer, to support native and web applications

• Build and improve internal back-office tools and operational dashboards

• Monitor and improve frontend performance: Core Web Vitals on web, cold start and frame time on native

• Support code reviews, architecture discussions, and mentoring across the engineering team

You’ll need to:

• Have 5+ years of professional frontend engineering experience

• Have deep React/NextJS experience and strong TypeScript and JavaScript skills

• Be comfortable with backend code, working with a BFF & with backend teams to shape frontend

• Have experience building complex production web applications that operate at scale

• Have experience with real-time interfaces, WebSockets, or streaming data

• Have implemented authentication in production: 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: our flagship surface is native mobile)

• Design systems, tokens, theming, and component libraries

• Keycloak or comparable identity platforms, passkeys / WebAuthn, biometric unlock

• Real-time market data or trading interfaces

• Fintech, trading, prediction markets, or another regulated industry

• Internal/admin tooling frameworks and frontend observability (Sentry, Datadog RUM)

• Experience with experimentation and A/B testing, using data and insights to inform product decisions

and continuously improve user experiences.

• AI-native engineering workflows: agentic coding, AI-assisted testing and review. Assume a generous

token budget; judgment, architecture, and ownership remain the differentiators

Compensation

Base salary: $180,000–$240,000 per year, based on experience.

What We Offer

• Competitive health and welfare benefits

• 401(k) retirement plan with company match

• Flexible vacation policy

• Home office setup reimbursement

• Access to mental health support