Senior Full Stack Engineer building GraphQL, React, and TypeScript platforms for PENN Entertainment’s online gaming and sports media products. Improving shared client tooling, server-driven UI, performance, observability, and release workflows.
Responsibilities
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
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