# SreeCharan Desu

> SreeCharan Desu, Forward Deployed Engineer at Manuscripts, building Yuzu.

## About
- Name: SreeCharan Desu (also written Desu SreeCharan)
- Role: Forward Deployed Engineer at Manuscripts (https://manuscripts.co.in), since Oct 2026
- Currently building: Yuzu (https://yuzu.sreecharandesu.in)
- Education: B.Tech CSE, Rajiv Gandhi University of Knowledge Technologies (IIIT AP, RGUKT), class of 2027
- Open source: merged PRs in Mozilla (mozilla/fxa), Cal.com, Apache Airflow, Brave, and Oppia (oppia#27839)
- Location: Ongole, Andhra Pradesh, India (IST)
- Email: sreecharan309@gmail.com

## Pages
- [Home](https://www.sreecharandesu.in/): Overview, experience, open source, featured work
- [Work](https://www.sreecharandesu.in/work): Projects with source links and local benchmarks
- [Resume](https://www.sreecharandesu.in/resume): Resume and PDF download
- [Blog](https://www.sreecharandesu.in/blog): Engineering notes
- [Full text for agents](https://www.sreecharandesu.in/llms-full.txt)

## Profiles
- https://github.com/sreecharan-desu
- https://linkedin.com/in/sreecharan-desu
- https://x.com/sreecharantwts

## Projects
- [Promptimizer](https://github.com/sreecharan-desu/promptimizer): OpenAI-compatible LLM router. Classifies each request, picks the cheapest adequate model, caches prompts, and checks quality. Local k6: /v1/classify 19,727 req/s at p95 4.73 ms (50 VUs), router overhead only.
- [Yuzu](https://github.com/sreecharan-desu/yuzu): Native macOS menu-bar app to convert, edit, and act on files at the pointer. About 270 conversion pairs, 26 tools. The ring appears in a median 8.8 ms on an M1 Air.
- [ABC Chess](https://abcchess.org): India's chess platform from kids to masters: coach dashboards, curriculum, classroom tools, and RBAC. Still maintaining it.
- [SynapStore](https://synapstore.me/): Pharmacy inventory backend with row-level concurrency on stock writes and role-based admin search.
- [UniZ](https://github.com/uniz-rguktong): Side-project campus platform with RBAC and resource tracking, used by 1,500+ students at RGUKT Ongole.
- [TransitOps](https://github.com/sreecharan-desu/odoo-hackathon-2026): Fleet, trips, maintenance, and fuel ops with RBAC for four desks, built in 8 hours. 66/66 integration tests. Local k6: GET /api/trips 1,042 req/s at p95 139.7 ms.
- [UIDAI Systems](https://github.com/sreecharan-desu/uidai-analytics-engine): Monthly ETL on GitHub Actions, private R2 storage, FastAPI with presigned URLs, and Power BI.
- [DocgenAI](https://auditlo.com): Frontend for an AI docs product - tighter UI, clearer flows, and API caching so the client stops repeating calls.

## Blog
- [One write, two deliveries](https://www.sreecharandesu.in/blog/one-write-two-deliveries): The notification service behind SynapStore, built during a hackathon. Redis Streams for history, pub/sub for speed, web push for closed tabs, and what I would change reading it a year later.
- [The bugs behind a cheap model router](https://www.sreecharandesu.in/blog/promptimizer-the-bugs-behind-a-cheap-model-router): Promptimizer routes each LLM request to the cheapest model that can handle it. The hard part was not the routing. It was streaming, stale state and models that quietly ran out of tokens.
- [The ring under the pointer](https://www.sreecharandesu.in/blog/the-ring-under-the-pointer): How Yuzu notices a key tap in the middle of someone else's file drag without asking for Accessibility permission, and what it took to ship one build for Intel and Apple Silicon.
- [Works on my machine is a bug](https://www.sreecharandesu.in/blog/works-on-my-machine-is-a-bug): Three small fixes in Vidya, a learning platform monorepo, that only showed up when the code left my laptop. A phone that could not reach localhost, tests that ran twice, and Swagger forms with no fields.
- [Running a chess LMS in production](https://www.sreecharandesu.in/blog/running-a-chess-lms-in-production): What I learned keeping live chess games running at ABC Chess, where serverless stops working and one bad line of JavaScript took the game server down.
- [What 10 merged PRs taught me about large codebases](https://www.sreecharandesu.in/blog/reading-big-codebases): How I find my way around repos like Mozilla accounts, Apache Airflow and Cal.diy, and the review that taught me the most.
- [Listening to my Mac](https://www.sreecharandesu.in/blog/listening-to-my-mac): Capturing system audio on macOS without a fake audio driver, and transcribing it on device for free.
- [The endpoint that took 2.5 seconds](https://www.sreecharandesu.in/blog/the-endpoint-that-took-2-5-seconds): A day of performance work on UniZ, the campus platform 1,500+ students at RGUKT use, and the slow query I only found once I stopped guessing and measured.