MindMitra

A shipped React Native cognitive-wellness app needed a backend-first architecture, Android support, server-bound AI generation, and quiz telemetry for research-informed spaced repetition.

Take over a live v1 product under its prior CognizenX branding, decouple AI from the mobile client, expand to Android, and instrument telemetry for spaced-repetition research workflows without disrupting existing users.

• Existing users and shipped iOS codebase to refactor without breaking core quiz flows
• Early deployment scope—not a large-scale production rollout
• Cross-platform release differences between iOS (TestFlight) and Android (Play internal track)
• App Store listing still published under the prior CognizenX name during the MindMitra rebrand

• Led a 3-engineer team to migrate AI and data workflows from a shipped React Native app into a dedicated backend architecture, enabling independent backend releases and faster iteration on ML-powered features.
• Built and maintained a 25-endpoint Node.js/Express backend on Vercel and MongoDB Atlas to centralize authentication, AI content generation, and scheduling workflows behind a unified API layer.
• Developed an automated GPT-4 content pipeline that generated 3,000+ questions across 40+ subdomains and ran ~300,000 embedding-based similarity checks to enforce semantic deduplication.
• Improved backend security and maintainability by moving exposed AI credentials server-side, implementing rate limiting and request validation, and expanding test coverage to 65 automated tests (~60% coverage).

• Migrated AI and data workflows onto a dedicated backend to enable independent releases and faster ML iteration
• Moved exposed AI credentials server-side with rate limiting and request validation on backend routes
• Invested in embedding-based deduplication and automated test coverage (~60% backend) before scaling content generation

• Embedding-based semantic deduplication across ~300,000 similarity checks to reduce redundant GPT-4 calls
• Rate limiting, request validation, and session authentication on backend routes
• 65 automated tests achieving ~60% backend code coverage

• 65 automated tests with ~60% backend code coverage

Delivered MindMitra v2 on iOS and Android with a decoupled backend, 25-endpoint API, GPT-4 content pipeline (3,000+ questions), and telemetry-driven spaced-repetition scheduling.

• Early deployment—not a large-scale production rollout
• iOS App Store listing remains under the prior CognizenX URL during rebrand

• Complete MindMitra rebrand across app store listings
• Expand per-question progress tracking for spaced-repetition analytics

• React Native
• Node.js
• Express
• MongoDB Atlas
• GPT-4
• Vercel
• Jest
• Supertest