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+# SwitchbackTech Organization - GitHub Copilot Instructions
+
+## Organization Overview
+
+**Mission**: Building intentional software that helps people value their time.
+
+**Primary Product**: Compass Calendar - a minimalist weekly planner that integrates seamlessly with Google Calendar, designed for people who want to reclaim control over their schedule without overwhelming complexity.
+
+**Philosophy**: 
+- Intentional software design - every feature serves a clear purpose
+- Minimalist user experience - powerful functionality without clutter
+- Time-conscious development - respect both user time and developer time
+- Open source and community-driven
+
+## Tech Stack & Architecture
+
+### Core Technologies
+- **Frontend**: React 18+, TypeScript, Styled Components
+- **Backend**: Node.js, Express.js, TypeScript
+- **Database**: MongoDB with Mongoose ODM
+- **Real-time**: Socket.io for live updates
+- **Authentication**: Supertokens for session management
+- **Testing**: Jest, React Testing Library
+- **Build**: Webpack, Yarn workspaces (monorepo)
+- **Cloud**: Google Cloud Platform
+- **Integration**: Google Calendar API, Google OAuth
+
+### Architecture Patterns
+- **Monorepo Structure**: Use Yarn workspaces with packages/* organization
+- **Clean Architecture**: Separate concerns between core business logic, API, and UI
+- **Component-Driven**: React components should be reusable and composable
+- **Type Safety**: Strict TypeScript configuration with proper type definitions
+- **Functional Programming**: Prefer pure functions and immutable data patterns
+
+## Coding Standards & Conventions
+
+### General Principles
+1. **Clarity over cleverness** - code should be immediately understandable
+2. **Consistency** - follow established patterns within each package
+3. **Performance-conscious** - especially for calendar rendering and real-time updates
+4. **Accessibility** - semantic HTML and ARIA labels for screen readers
+5. **Mobile-first** - responsive design starting from mobile viewport
+
+### TypeScript Guidelines
+- Use strict mode with `noImplicitAny` and `strictNullChecks`
+- Prefer interfaces over types for object shapes
+- Use proper generic types for reusable components
+- Export types alongside implementation code
+- Use meaningful type names that describe the domain (e.g., `Schema_Event`, `Schema_GridEvent`)
+- Use Zod schemas for runtime validation (e.g., `CoreEventSchema`, `GridEventSchema`)
+- Extend base schemas when adding functionality (e.g., `GridEventSchema.extend()`)
+
+### React Best Practices
+- Use functional components with hooks
+- Keep components small and focused on single responsibility
+- Use custom hooks for shared logic
+- Prefer composition over inheritance
+- Use React.memo() for performance optimization when needed
+- Follow the "lift state up" principle for shared state
+
+### File & Folder Conventions
+- Use kebab-case for file names
+- Co-locate tests next to source files (not separate test directories)
+- Use index.ts files for clean imports
+- Group related functionality in feature folders
+- Follow the existing package structure: `packages/{backend,core,web,scripts}`
+
+### Naming Conventions
+- **Components**: PascalCase (e.g., `GridEvent`, `SomedayEventContainer`)
+- **Functions**: camelCase with descriptive verbs (e.g., `createEvent`, `formatTimeSlot`)
+- **Constants**: SCREAMING_SNAKE_CASE (e.g., `DEFAULT_TIME_ZONE`, `SOMEDAY_WEEKLY_LIMIT`)
+- **Types/Interfaces**: PascalCase with descriptive names (e.g., `Schema_Event`, `Schema_GridEvent`)
+- **Enum Values**: SCREAMING_SNAKE_CASE (e.g., `Priorities.UNASSIGNED`, `Origin.GOOGLE`)
+- **Props Interfaces**: ComponentName + "Props" (e.g., `GridEventProps`, `EventFormProps`)
+
+## Domain-Specific Guidance
+
+### Domain-Specific Guidance
+
+### Calendar & Time Management
+- Always consider time zones when working with dates
+- Use dayjs for consistent date manipulation
+- Implement proper handling for recurring events using `recurrence.rule` and `recurrence.eventId`
+- Consider performance for large date ranges
+- Maintain consistency with Google Calendar conventions
+- Use proper field names: `startDate`/`endDate` (not `start`/`end`)
+- Handle Google Calendar integration via `gEventId` and `gRecurringEventId` fields
+
+### User Experience Priorities
+1. **Speed**: Calendar operations should feel instantaneous
+2. **Simplicity**: Default to the simplest solution that works
+3. **Shortcuts**: Power users should have keyboard shortcuts
+4. **Offline resilience**: Graceful degradation when offline
+5. **Minimal clicks**: Reduce the number of interactions needed
+
+## Repository-Specific Guidelines
+
+### `compass` (Main Application)
+- Follow the existing monorepo structure with backend, core, and web packages
+- Use the established testing patterns with Jest
+- Maintain the existing component library patterns
+- Consider Google Calendar sync implications for any data changes
+- Test thoroughly with the staging environment before production
+
+### `compass-docs` (Documentation)
+- Use Docusaurus conventions and components
+- Keep documentation up-to-date with code changes
+- Include code examples for complex features
+- Maintain consistency with the main app's terminology
+
+### `.github` (Organization Config)
+- Follow GitHub best practices for workflows and templates
+- Keep organization-wide configurations minimal and focused
+- Test any workflow changes in a fork first
+
+## Testing Requirements
+
+### Coverage Expectations
+- **Unit Tests**: All business logic functions must have tests
+- **Integration Tests**: API endpoints and database operations
+- **Component Tests**: React components with user interaction scenarios
+- **E2E Tests**: Critical user flows like event creation and sync
+
+### Testing Patterns
+- Use descriptive test names that explain the scenario
+- Follow Arrange-Act-Assert pattern
+- Mock external dependencies (Google API, database)
+- Test error conditions and edge cases
+- Use factories or fixtures for test data
+
+## Performance Considerations
+
+### Frontend Performance
+- Optimize calendar rendering for large date ranges
+- Use React.memo() and useMemo() for expensive calculations
+- Implement virtual scrolling for long lists
+- Minimize re-renders during drag-and-drop operations
+- Lazy load non-critical components
+
+### Backend Performance
+- Use database indexes for calendar queries
+- Implement proper caching for Google Calendar sync
+- Use connection pooling for database operations
+- Monitor and optimize API response times
+- Consider rate limiting for external API calls
+
+## Security Guidelines
+
+### Data Protection
+- Never log sensitive user data (calendar events, personal info)
+- Use proper validation for all user inputs
+- Implement CSRF protection for state-changing operations
+- Follow OAuth best practices for Google integration
+- Use environment variables for all sensitive configuration
+
+### Authentication & Authorization
+- Use Supertokens for consistent session management
+- Implement proper role-based access if needed
+- Validate user permissions for calendar operations
+- Use secure session cookies
+- Implement proper logout functionality
+
+## Documentation & Learning Resources
+
+### Internal Documentation
+- **Main docs**: https://docs.compasscalendar.com
+- **Contributing guide**: Follow conventions at docs.compasscalendar.com/docs/contribute/convention-guide
+- **Setup guide**: Available in main repository README
+- **API documentation**: Generated from TypeScript types
+
+### External References
+- **Google Calendar API**: https://developers.google.com/calendar
+- **React best practices**: https://react.dev/learn
+- **TypeScript handbook**: https://www.typescriptlang.org/docs/
+- **Accessibility guidelines**: https://www.w3.org/WAI/WCAG21/quickref/
+
+## Common Patterns & Examples
+
+### Event Types and Interfaces
+```typescript
+// Core event interface from @core/types/event.types
+interface Schema_Event {
+  _id?: string;
+  allDayOrder?: number;
+  description?: string | null | undefined;
+  endDate?: string;
+  isAllDay?: boolean;
+  isSomeday?: boolean;
+  gEventId?: string;
+  gRecurringEventId?: string;
+  order?: number;
+  origin?: Origin;
+  priority?: Priority;
+  recurrence?: {
+    rule?: string[];
+    eventId?: string;
+  };
+  startDate?: string;
+  title?: string;
+  updatedAt?: Date | string;
+  user?: string;
+}
+
+// Grid event interface from @web/common/types/web.event.types
+interface Schema_GridEvent extends Schema_Event {
+  hasFlipped?: boolean;
+  isOpen?: boolean;
+  row?: number;
+  position: {
+    isOverlapping: boolean;
+    widthMultiplier: number;
+    horizontalOrder: number;
+    dragOffset: { y: number };
+    initialX: number | null;
+    initialY: number | null;
+  };
+}
+
+// Priority enum from @core/constants/core.constants
+enum Priorities {
+  UNASSIGNED = "unassigned",
+  WORK = "work",
+  SELF = "self",
+  RELATIONS = "relationships",
+}
+
+type Priority = Priorities.UNASSIGNED | Priorities.WORK | Priorities.SELF | Priorities.RELATIONS;
+```
+
+### Event Creation Pattern
+```typescript
+const createEvent = async (event: Omit<Schema_Event, '_id'>): Promise<Schema_Event> => {
+  // Validate time boundaries with dayjs
+  const start = dayjs(event.startDate);
+  const end = dayjs(event.endDate);
+  
+  // Sync with Google Calendar if needed
+  // Store in local database
+  // Return created event with _id
+};
+```
+
+### Component Structure Pattern
+```typescript
+interface GridEventProps {
+  event: Schema_GridEvent;
+  isDraft: boolean;
+  isDragging: boolean;
+  isPlaceholder: boolean;
+  isResizing: boolean;
+  isRecurring: boolean;
+  isInPast: boolean;
+  measurements: Measurements_Grid;
+  onEventMouseDown: (event: Schema_GridEvent, e: MouseEvent) => void;
+  onScalerMouseDown: (
+    event: Schema_GridEvent,
+    e: MouseEvent,
+    dateToChange: "startDate" | "endDate",
+  ) => void;
+  weekProps: WeekProps;
+}
+
+export const GridEvent = memo(forwardRef<HTMLDivElement, GridEventProps>(
+  ({ event, isDraft, isDragging, ...props }, ref) => {
+    const isRecurring = event.recurrence && event.recurrence?.eventId !== null;
+    const isInPast = dayjs().isAfter(dayjs(event.endDate));
+    
+    return (
+      <StyledEvent
+        ref={ref}
+        priority={event.priority || Priorities.UNASSIGNED}
+        isRecurring={isRecurring}
+        isDragging={isDragging}
+        // ... other props
+      >
+        {/* Component implementation */}
+      </StyledEvent>
+    );
+  }
+));
+```
+
+### Import Patterns
+```typescript
+import dayjs from "dayjs";
+import { Priorities, Origin } from "@core/constants/core.constants";
+import { Schema_Event, Schema_GridEvent } from "@core/types/event.types";
+import { Schema_GridEvent as WebGridEvent } from "@web/common/types/web.event.types";
+```
+
+## Error Handling
+
+### Frontend Error Boundaries
+- Use React Error Boundaries for component-level errors
+- Provide meaningful error messages to users
+- Log errors for debugging but never expose sensitive data
+- Implement graceful fallbacks for failed operations
+
+### Backend Error Handling
+- Use consistent error response format
+- Log errors with appropriate context
+- Handle Google API rate limits gracefully
+- Provide retry mechanisms for transient failures
+
+Remember: The goal is to build software that genuinely improves how people manage their time, without adding unnecessary complexity to their lives or to the codebase.
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