Fullstack Developer

We are seeking skilled Full Stack Developers to join our engineering team and build end-to-end features across our React frontend and .NET GraphQL backend. You will work across a modern React monorepo and a robust C# API layer designing responsive UIs, writing GraphQL queries and mutations, implementing business logic, and working with our SQL Server database.This is a high-impact role where your work directly shapes the experience of elite athletes and the professionals who support them.
You'll work across a modern, full stack architecture:
Frontend Layer Technology

• FrameworkReact 19 + TypeScript 5.8 (strict mode)
• BuildVite 5, Node 24+
• UI ComponentsMantine v8, Tailwind CSS
• Data VisualizationChart.js, Plotly.js, Rechart
• State ManagementZustand, XState (state machines)
• API LayerGraphQL (urql) with full codegen pipeline
• AuthenticationAzure AD / MSAL
• RoutingReact Router 7, Generouted (file-based)
• TestingVitest, Testing Library, Storybook 8
• Rich ContentTiptap editor, FullCalendar
• ValidationZod
• ObservabilityAzure Application Insights
• CI/CDAzure Static Web Apps

The frontend is a monorepo hosting multiple apps (Admin, Partner, Public, Report) with shared packages and typed GraphQL codegen.
Backend Layer TechnologyLanguage

• C# 12 / .NET 8
• GraphQL
• HotChocolate v15 (ASP.NET Core)
• ORMEntity Framework Core 8 (SQL Server)
• AuthenticationJWT Bearer + Microsoft Identity Web + custom ApiKey scheme
• Background TasksAzure Functions (isolated process, .NET 8)
• MessagingAzure Service Bus
• ConfigurationAzure App Configuration (with refresh/sentinel pattern)
• EmailSendGrid
• PaymentsSquare
• TestingxUnit + Snapshooter + Coverlet
• CI/CDGitHub Actions (CI) + Azure DevOps Pipelines (CD)

IntegrationsThe backend integrates with a variety of external services including HubSpot (CRM), Square (payments), SendGrid (email), Slack (notifications), OpenAI (AI features), Microsoft Graph (Azure AD / M365), Azure Blob Storage (file storage), and specialized sports-tech platforms like Hawkin (force plates) and HumanGo (training platform).
Responsibilities

• Build features end-to-end Design and implement complete features from the React UI through to the .NET GraphQL API and SQL Server database, including schema design, mutations, and responsive interfaces.
• Build data-driven UIs — Develop responsive, performant interfaces for athlete assessment dashboards, performance reports, and scheduling workflows using React 19, TypeScript, and Mantine.
• Visualize complex data — Create compelling charts, force-time curves, and animated data displays using Chart.js, Plotly, and SVG to communicate physiological metrics to athletes and coaches.
• Design and extend the GraphQL API — Write HotChocolate queries and mutations in C#, define types and input types, implement DataLoaders to prevent N+1 queries, and maintain efficient data access with Entity Framework Core.
• Own the GraphQL integration layer — Write typed frontend queries and mutations, maintain the codegen pipeline, and ensure efficient data fetching with urql and Graphcache.
• Work with the database — Design EF Core models, write migrations, and implement repository patterns against SQL Server.
• Build background processing — Implement Azure Functions for async tasks such as email delivery, service bus consumers, and third-party integration workflows.
• Ship with confidence — Write unit and integration tests across both frontend (Vitest, Testing Library) and backend (xUnit), document components in Storybook, and participate in thorough code reviews.
• Architect for scale — Contribute to monorepo architecture decisions, shared component libraries, API design patterns, and cross-app patterns that support multiple user-facing applications.
• Stay current — Actively contribute to the evolution of our tech stack, evaluate new tools, and champion best practices in accessibility, performance, security, and developer experience.

Qualifications Required

• 5+ years of professional full stack development experience with React/TypeScript and a server-side language (C#/.NET strongly preferred).
• Strong understanding of component architecture, hooks, context, and modern React patterns.
• Experience with GraphQL — both as a consumer (urql, Apollo) and ideally as a backend implementer (HotChocolate, Apollo Server, or similar).
• Working knowledge of relational databases and ORMs (SQL Server, PostgreSQL, Entity Framework Core, or similar).
• Familiarity with state management solutions (Zustand, Redux, XState, or similar).
• Experience with modern build tools (Vite, esbuild, or webpack) and monorepo patterns.
• Solid understanding of CSS architecture — CSS Modules, Tailwind, or CSS-in-JS.
• Experience with testing across the stack — unit tests, component tests, integration tests, and snapshot/visual regression.
• Proficiency with Git, code review workflows, and CI/CD pipelines.
• Excellent problem-solving skills and ability to collaborate effectively in a distributed team.
  

Nice to Have

• Experience with C# / .NET 8 and ASP.NET Core.
• Experience with HotChocolate GraphQL framework.
• Familiarity with Entity Framework Core migrations and database-first/code-first patterns.
• Experience with Azure services (Functions, Service Bus, App Configuration, Static Web Apps, MSAL/Entra ID, Application Insights, Blob Storage).
• Experience with Mantine or other headless/composable UI libraries.
• Background in sports science, health tech, or data-intensive applications.
• Experience with Storybook for component-driven development.
• Familiarity with file-based routing (Generouted, Next.js, or similar).
• Experience with event-driven architectures and message queues.

Benefits

• Cutting-edge stack — React 19, .NET 8, HotChocolate GraphQL, TypeScript strict mode, full GraphQL codegen — we invest in modern tooling across the entire stack.
• Meaningful impact — Your code directly helps athletes improve performance and supports physiologists in delivering better care.
• Growth opportunities — Fast-paced startup environment with room to shape architecture and technical direction across frontend and backend.
• Collaborative culture — Inclusive team with a focus on personal and professional development.
• Unique domain access — Work alongside experienced sports coaches and exercise physiologists.