Senior Full Stack Engineer, Client Platform

New

PENN Entertainment, Inc.Online gaming, sports media

Remote, United StatesFull-TimeSenior

Salary135,000 - 180,000 USD per year

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Job Details

Experience: At least 5 years of experience in software engineering; 2+ years designing and evolving GraphQL schemas for product surfaces used by multiple clients (iOS, Android, web).
Required Skills: GraphQLNode.jsHTMLCSSJavascriptJestKubernetesTypeScriptReactDatadog

At least 5 years of experience in software engineering.
At least 2 years designing and evolving GraphQL schemas for product surfaces used by multiple clients.
Strong JavaScript, TypeScript, and React skills, with UX instincts.
Fluency with HTML, CSS, and browser technologies, including the DOM, events, and platform APIs.
A solid computer science foundation, including data structures, distributed systems, algorithms, and software design.
Experience with production systems at scale, load testing, and tracing.
Experience investigating production performance regressions, including CPU hotspots and latency in high-throughput services.
Experience on an on-call rotation for a production service and owning release cycles end to end.
API development experience with Node, Bun, or another server framework.
Experience building and integrating multi-client or white-label platforms, including geo-based routing and per-brand configuration.
Experience with Kubernetes and operating services in containers.
Comfort using the terminal, Git and GitHub or similar, and an editor of choice.
Experience with Jest or Vitest and ExUnit, RSpec, or pytest.

Design and evolve federated GraphQL schemas, including server-driven UI contracts for mobile and web clients.
Classify breaking schema changes, coordinate migrations with iOS, Android, and web leads, and keep generated client models in sync.
Develop and optimize GraphQL APIs, RPC endpoints, and SQL queries behind web surfaces.
Build front-end applications and shared libraries with React and TypeScript.
Partner with product and design to architect and ship customer-facing features.
Use observability tooling and configure DataDog monitoring and alerts to diagnose issues and improve systems.
Identify technical debt, production bottlenecks, and risks, and drive improvements to code quality and platform scalability.
Mentor teammates through code review, pairing, and documentation.
Write tests for features and bug fixes, and work with QA to strengthen automated testing pipelines and CI/CD workflows.

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