Senior Full Stack Engineer, Client Platform
Penn Interactive3 months ago
Remote, CanadaSenior
Responsibilities
- Design and evolve federated GraphQL schemas and versioned server-driven UI contracts for iOS, Android, and web clients.
- Develop, scale, and optimize GraphQL APIs, RPC endpoints, and SQL queries.
- Build fast, accessible front-end applications and shared libraries with React and TypeScript.
- Partner with product and design teams to architect and ship customer-facing features.
- Use observability tooling, DataDog monitoring, and alerting to diagnose issues and improve owned systems.
- Identify technical debt, production bottlenecks, performance risks, and scalability improvements.
- Participate in architecture, feature delivery, release cycles, on-call support, code review, pairing, and mentoring.
- Write thorough tests and work with QA to improve automated testing pipelines and CI/CD workflows.
- Use Claude Code in daily development.
Requirements
- At least 5 years of software engineering experience.
- Strong JavaScript, TypeScript, React, HTML, CSS, browser, UX, data structures, distributed systems, algorithms, and software design knowledge.
- At least 2 years designing and evolving GraphQL schemas for product surfaces used by iOS, Android, and web clients.
- Experience with production systems at scale, load testing, tracing, performance regression diagnosis, CPU hotspots, and high-throughput services.
- Experience with production-service on-call rotations and end-to-end release ownership.
- Experience developing APIs with 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, terminal-based development, Git, and GitHub or similar tools.
- Experience with Jest or Vitest and ExUnit, RSpec, or pytest.
- Preferred experience includes Apollo Federation, Absinthe, iOS or Android development with Swift or Kotlin, hexagonal architecture, domain-driven design, PostgreSQL, MySQL, Oban, Exq, Sidekiq, Celery, Kafka, RabbitMQ, SQS/SNS, Pub/Sub, open source contributions, startup experience, and sports or esports interest.
Benefits
- Competitive compensation package.
- Fun, relaxed work environment.
- Education and conference reimbursements.
- Career progression and mentoring opportunities.
- Remote role, indicated by #LI-REMOTE.
Tech Stack
Apache KafkaCSSDatadogFastAPIGitGraphQLHTMLiOSJavaScriptJestKotlinKubernetesLaravelMySQLNode.jsPhoenixPostgreSQLpytestRabbitMQReactRSpecRuby on RailsSQLSwiftTypeScript
Categories
About Penn Interactive
Penn Interactive is the digital product and engineering arm of PENN Entertainment (NASDAQ: PENN), developing and operating online sportsbook and iCasino platforms for regulated markets in North America. Its portfolio includes ESPN BET in the U.S., theScore Bet in Ontario, and Hollywood Casino online, all built on proprietary tech. Backed by a parent company headquartered in Wyomissing, Pennsylvania that operates 40+ casinos across 20 states, it connects online play with on-property experiences.