Senior Frontend Engineer

High Roller Technologies; New York (NY); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Health benefits

401(k) with company match

Flexible vacation policy

Home office setup reimbursement

Mental health support

Job summary

ROLR is seeking a Senior Frontend Engineer in New York to build the customer-facing experience of its prediction markets platform for web and mobile. You will own product-minded frontend work across React, NextJS, React Native, and TypeScript, delivering real-time interfaces with live data and secure authentication.

You will collaborate with Product, Design, Backend, QA, and Compliance to ship scalable web applications, improve performance, and contribute to design systems and tooling.

Qualifications

• 5+ years of professional frontend engineering experience.
• Strong React/NextJS with TypeScript/JavaScript skills.
• Experience shipping complex production web apps at scale.
• Real-time interfaces using WebSockets or streaming data.
• Authentication in production: OAuth 2.0 / OIDC flows, token lifecycle.
• WCAG 2.1 AA accessibility, responsive design, and API integration.
• Collaborate with Product, Design, Backend, QA, and Compliance.

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.

Skills

React/NextJS

TypeScript/JavaScript

Real-time interfaces

OAuth/OIDC auth

WCAG accessibility

HTML/CSS

Frontend debugging

Cross-team collaboration

Frontend architecture

New York-based

Job description

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