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Senior Full Stack Engineer, Client Platform

1 month, 2 weeks ago
Canada
Full-time
Senior
Backend Engineer
Software Development
Agile AWS Celery CSS Datadog DOM FastAPI Git GitHub GraphQL HTML JavaScript Jest Kafka Kotlin Kubernetes Laravel MySQL Node.js Phoenix PostgreSQL Pytest RabbitMQ React RSpec Ruby on Rails Sidekiq SQL Swift TypeScript
Apply Now
PENN Entertainment

PENN Entertainment

PENN Entertainment is a leading provider of integrated entertainment, sports content, and casino gaming experiences across North America, offering a diverse range of entertainment destinations and a premier loyalty program that rewards members with cas...

Hotels, Restaurants & Leisure
10K-50K
Founded 1982
View All Jobs 11

Description

  • Design and evolve GraphQL schemas in a federated graph, including server-driven UI contracts for mobile and web clients.
  • Treat schemas as versioned contracts, coordinate breaking-change migrations, and keep generated client models in sync.
  • Develop, scale, and optimize GraphQL APIs, RPC endpoints, and SQL queries behind web surfaces.
  • 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 experience.
  • Set up and refine monitoring and alerting in DataDog for owned systems.
  • Improve code quality by identifying technical debt and proposing fixes.
  • Find production bottlenecks and drive changes that improve platform scalability.
  • Mentor teammates through code review, pairing, and documentation.
  • Participate in design, architecture, and delivery of new features in a collaborative agile team.
  • Write thorough tests for features and bug fixes, and work with QA on automated testing and CI/CD workflows.

Requirements

  • At least 5 years of experience in software engineering.
  • Strong JavaScript, TypeScript, and React experience, with good UX instincts.
  • 2+ years designing and evolving GraphQL schemas for multi-client product surfaces.
  • Fluency with HTML, CSS, and browser APIs, including the DOM and events.
  • Strong foundation in computer science, including data structures, distributed systems, algorithms, and software design.
  • Experience working with production systems at scale, including load testing and tracing.
  • Experience investigating and fixing production performance regressions, including CPU hotspots and latency issues.
  • Experience with on-call rotation and owning release cycles end to end.
  • Clear writing ability, including tech specs, runbooks, and cross-team design docs.
  • Experience with API development in Node or Bun, or another server framework such as 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 operating services in containers.
  • Comfort working in the terminal, with Git and GitHub or similar, and in an editor of choice.
  • Experience with testing frameworks such as Jest or Vitest, and ExUnit, RSpec, or pytest.
  • Nice to have: Apollo Federation at scale, GraphQL APIs with 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, or a passion for sports or esports.

Benefits

  • Competitive compensation package with a CAD $135,000–$180,000 salary range.
  • Fun, relaxed work environment.
  • Education and conference reimbursements.
  • Opportunities for career progression and mentoring others.
  • Remote work option (#LI-REMOTE).
  • Best-in-class benefits for eligible employees.
  • Commission eligibility for most sales positions and bonus eligibility for most non-sales positions.

Interested in this position?

Apply directly on the company website

Apply Now

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