Senior Software Engineer - React Native

Underdog is a fast-growing sports company focused on enhancing the experience for sports fans. They are seeking a Senior Software Engineer specializing in React Native to help build and improve their core betting experience across multiple platforms.

Responsibilities:

• Build and scale core parts of the mobile and web apps in React Native; entry building, review, placement, and tracking. The whole lifecycle
• Investigate and resolve critical issues in the React Native client, and put guardrails in place so they don't recur
• Lead design reviews for initiatives that cut across iOS, Android React Native clients, calling out trade-offs, risks, and failure modes before they become incidents
• Partner with backend, product, and design on entry placement, entry confirmation, slip changes and errors, and bet history to keep the experience fast and consistent
• Turn ambiguous, cross-team goals into concrete plans with milestones and clear owners
• Use data like product analytics, error dashboards, and session data to validate that fixes actually land and to catch regressions early
• Coach other engineers on design reasoning and ownership, and create reusable patterns that other teams adopt
• Anticipate and mitigate risks in shared systems before they impact other teams or customers

Requirements:

• 7+ years of professional software engineering experience, with meaningful time spent in React Native and a solid grasp of the native iOS/Android layers underneath it
• A track record of solving cross-cutting or ambiguous problems that span multiple services, teams, or platforms; not just staying in your lane
• Experience leading technical initiatives (performance work, reliability improvements, developer velocity) with measurable before/after impact
• Comfort turning unclear, high-level goals into an executable plan with milestones and owners that other teams actually align on
• A collaborative, coaching mindset; you make other engineers better through review and design discussion, not just your own output
• Strong written and verbal communication; you can make a technical trade-off legible to product, design, and other engineering teams
• Experience with mobile app performance, testability, and shipping reliable features at scale
• Background in sports, fantasy, or gaming
• Experience working on wagering, betting, or other high-stakes transactional flows
• Familiarity with Amplitude, Datadog, or similar tools for instrumenting and monitoring client-side behavior