Tushar Nath

Digital transformation · APAC

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AI product

Niyavo

A multi-module AI fitness and wellness app: daily orchestration, food and body tracking, guided training, yoga, meditation and planning, built as one coherent system rather than separate tools.

Status
In development
Product site
niyavo.com (opens in new tab)
Built with
Expo SDK 54 · React Native · TypeScript (strict) · FastAPI · PostgreSQL via Supabase · OpenAI Vision · Railway

The case study

The problem

The body does not know it has been divided into apps. It runs sleep, appetite, effort and recovery as one continuous system, while the phone splits them into separate trackers, each certain about its own sliver and blind past its edges. Whatever happens between them, and everything important happens between them, becomes the user's unpaid job. Niyavo begins where that fragmentation ends: one system watching the whole, thinking in connections, adjusting the regime as life happens. A rough week of sleep is not a statistic filed in one app; it is the reason tomorrow's session arrives gentler, before the body has to make the argument itself.

The approach

Under one roof: guided training, yoga, meditation, food, body tracking, sleep, steps, running, and a planner keeping the day's honest ledger. Under the floorboards, an architecture shaped around a single builder. Every module was built as a vertical slice, isolated end-to-end over a shared backend. The frontend's TypeScript interfaces and the backend's Pydantic models were held in enforced parity, so the two halves of the system could never quietly disagree, and every AI call stayed behind the backend, never in the app. Review was written into the workflow itself: a pre-flight and post-flight protocol named Regression Zero, run with assistants that changed as the builder did, ChatGPT getting the build started and Claude Code then taking it forward, working directly in the codebase.

The result

Authentication, database, backend and app: all of it was built end-to-end by one person. Its first user is its builder, and the stakes are personal in the most literal sense: his own sleep, food, training and recovery went onto the thing he made. Niyavo was his first full-stack product, and the inventory it returned reads like a curriculum: frontend, backend, design, databases, authentication, every one of them a skill this build taught him.

What it taught

Every builder keeps a file marked "not in this lifetime." App development sat in his for years, until he opened it and began, ahead of any confidence. One problem gave way, then the next, and at some point the repetition crossed a line no single day announced: the impossible thing had become Tuesday's work. Which is why the lesson he kept is a human one. Patience, perseverance and determination, pointed in one clear direction, moved something he had classified as unmovable, and the file marked "not in this lifetime" has been thin ever since.

Source: Confirmed directly by the owner · confirmed 2026-08-20

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