Senior Full Stack Engineer, Client Platform

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Penn Interactive

WebsiteLinkedInAll Job Openings

201 - 500 employees

🎲 Gambling

🎮 Gaming

🛍️ eCommerce

Gambling • Gaming • eCommerce

Penn Interactive is an interactive gaming company headquartered in Philadelphia, with additional offices in Greenfield, MA, and Cherry Hill, NJ. As the digital arm of PENN Entertainment, it manages various digital products, including the Barstool Sportsbook. The company is focused on fast-paced growth in the sports betting and online casino space, leveraging partnerships with Barstool Sports and theScore to offer a unique sports betting experience through mobile apps and retail locations.

📋 Description

• Design and evolve GraphQL schemas in a federated graph, 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 synchronized • Develop, scale, and optimize GraphQL APIs, RPC endpoints, and SQL queries • Build front-end applications and shared libraries with React and TypeScript • Build fast, accessible web applications • Partner with product and design to architect and ship customer-facing features • Use observability tooling to diagnose issues and improve guest experiences • Set up and refine monitoring and alerting in DataDog • Improve code quality by identifying technical debt and proposing fixes • Find production bottlenecks and risks and drive platform-scaling improvements • Mentor teammates through code review, pairing, and documentation • Participate in design, architecture, and feature delivery within a collaborative agile team • Write thorough tests for features and bug fixes • Work with QA to strengthen automated testing pipelines and CI/CD workflows • Use Claude Code in daily development • Perform other duties as required

🎯 Requirements

• At least 5 years of experience in software engineering • Strong JavaScript, TypeScript, and React skills, plus UX instincts • 2+ years designing and evolving GraphQL schemas for product surfaces used by iOS, Android, and web clients • Fluency with HTML, CSS, and browser technologies including DOM, events, and platform APIs • Solid computer science foundation covering data structures, distributed systems, algorithms, and software design • Understanding of production systems at scale, including load testing and tracing • Experience investigating and fixing production performance regressions, CPU hotspots, and latency in high-throughput services • Experience with on-call rotation for a production service and end-to-end release ownership • Experience authoring technical specifications, runbooks, and cross-team design documents • Experience with API development in Node, Bun, Phoenix, Ruby on Rails, FastAPI, or Laravel • Experience building and integrating multi-client or white-label platforms, including geo-based routing and per-brand configuration • Experience with Kubernetes and containerized services • Comfort with terminal tools, Git, and GitHub or similar • Experience with testing frameworks such as Jest, Vitest, ExUnit, RSpec, or pytest • Nice to have: Apollo Federation at scale, Absinthe, iOS or Android development with Swift or Kotlin, hexagonal architecture, domain-driven design, relational databases, background job processing, asynchronous event infrastructure, open-source contributions, startup experience, and sports or esports passion

🏖️ Benefits

• Competitive compensation package • Fun, relaxed work environment • Education and conference reimbursements • Opportunities for career progression and mentoring others • Bonus eligibility for most non-sales positions • Best-in-class benefits with options and support personalized to employees’ physical, financial, and emotional needs