Successfully implemented Google Calendar authentication and data integration:

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  Implemented Google Calendar OAuth authentication flow
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  Successfully established connection to Google Calendar API
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  Built integration pipeline to fetch and display calendar data
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  Able to retrieve user's calendar events and display them in ZenDuo interface
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  Laid foundation for bi-directional calendar synchronization

Added backend functionality and validated the product concept:

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  Implemented Supabase integration for beta testing email collection
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  First functionality that interacts with a real backend database
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  Won a product design case competition with the ZenDuo concept
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  Gathering customer feedback to validate product-market fit
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  Following a 'demo, sell, then build' approach to avoid the build trap

Started internal testing and made significant performance enhancements:

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  Began internal dog fooding to gather real-world usage data and feedback
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  Reduced latency between text input and output for a more responsive experience
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  Improved relevance of chat responses through context handling optimizations
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  Implemented streamlined request processing pipeline for better performance

Integrated OpenAI APIs and fine-tuned our AI assistant:

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  Selected GPT-4o as our primary language model after extensive testing
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  Implemented custom prompt engineering for task management context
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  Created specialized fine-tuning datasets for productivity optimization
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  Built secure API integration with token management and rate limiting

Enhanced user experience with consistent design and improved calendar:

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  Unified design language across all pages with consistent dark theme
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  Improved calendar with inline task creation for better workflow
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  Enhanced pricing page with feature comparison and particle effects
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  Optimized responsive design for all device sizes

Enhanced the visual design and user experience:

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  Refined color scheme and typography
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  Improved responsive behavior on mobile devices
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  Added subtle animations for better user engagement
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  Enhanced visual hierarchy of UI elements

Exploring technical options for authentication and AI integration:

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  Implementing Google authentication and database storage for user data
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  Evaluating Flask as a backend solution for ChatGPT integration
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  Testing different language models and defining selection criteria

First iteration of our landing page with key components:

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  Hero section with waitlist signup
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  Interactive demo preview
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  Responsive design for all devices

ZenDuo project started with initial planning and design:

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  Brand identity and logo design
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  Initial wireframes and mockups
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  Core concept and feature planning