Hayyan HajwaniFull-stack & infrastructure
Resume
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Hi, I’m Hayyan. I live in Mumbai and build the backend systemsThe part you don’t see: the APIs, databases and servers that keep an app working. first, then the AI featuresAnswers drawn from a team’s own documents, with automatic checks on whether they’re any good. on top of them. By day that’s my job, as a Tech Lead at PlanetPulse. The rest of the time I’m training, dropping into Fortnite, or pulling a library apart to see how it works. I write some of it down in my patch notes.

Hi, I’m Hayyan. I live in Mumbai and build backend systemsAPIs, background jobs and Postgres, shipped in Docker to Linux servers I run myself. in NestJS and FastAPI, the LLM featuresRAG over Pinecone, a DeepEval service scoring live answers on 7 metrics, and model calls with provider fallback. and Next.js and Expo apps on top, and the Linux boxes underneath, with backups I have actually restored from. By day that’s my job, as a Tech Lead at PlanetPulse. The rest of the time I’m training, dropping into Fortnite, or reading a library’s source to see how it works. I write some of it down in my patch notes.

Hayyan’s signature

Mumbai is on IST, UTC+05:30.

Now

Since 05/26
Tech Lead at PlanetPulse, remote across Austria and Noida. Roadmap, architecture, sprint planning, and every merge.
Weekends
Sending small fixes to the open-source tools I use.
Up for
Interesting problems: an API that needs building, infrastructure that needs tidying, a bug nobody can pin down.

Where I’ve worked

2025 → now

Open a row for what the company does and what I did there.

  1. Makers of Notch, safety reporting for industrial sites.

    • Lead six engineers across Austria and India: roadmap, architecture, sprint planning, and every merge.
    • Shipped Notch as a NestJS API, a Next.js console and an Expo app, live in seven languages.
    • Replaced per-seat SaaS with 20+ self-hosted services on three Linux servers.
    NestJSNext.jsExpoPostgreSQLDokployTraefiktrynotch.app ↗

  2. Smart toothbrushes and water flossers, made for India.

    • Read the Bluetooth Low Energy traffic off the device and rebuilt the protocol: framing, handshakes, errors.
    • Wrote a typed React Native SDK with 120 unit tests and a fake transport that replays captured sessions.
    • Owned the platform end to end after that: roadmap, API architecture, review, and releases.
    React NativeTypeScriptBluetooth LEoracura.in ↗

  3. Creative, media and technology agency, India and UK.

    • Built AI Adapts in Second Brain, the agency’s AI workspace: one approved creative, resized for every platform without breaking the brand.
    • Rebuilt the transcript pipeline behind Echo, the bot that joins client meetings and files the notes.
    • Shipped the post generator and QC bot workflows, and helped on the slide and PPT generators.
    Node.jsNext.jsPostgreSQLPineconeFastAPIAWSschbang.com ↗

  4. Chat, voice and video SDKs for apps.

    • Built a WhatsApp-style reference app on the real-time messaging SDK, used to demo the platform to prospects.
    • Extended the UI Kit with custom components and wrote the workarounds up as customer implementation guides.
    ReactCometChat SDKcometchat.com ↗

Selected work(04)

Notch app home screen: open reports, and buttons to report an issue by photo, voice or text.
Notch app report screen: an unsafe observation with its reporter, manager, photos and an AI Insight tab.

PlanetPulse · 2026 → now · trynotch.app

Catching plant hazards before they injure someone

Factory workers report a hazard from their phone, safety officers triage it in the browser, and managers hear about it before the deadline passes rather than after. I designed it and shipped all three surfaces with the team.

NestJS API, Next.js console, Expo app. Deadline-escalation engine that warns managers before a report breaches its response target, role-scoped access per plant, and an LLM translation pipeline with provider fallback across OpenRouter and Google.

Second Brain chat: a brand-scoped conversation, with Chat, Meetings and Image tabs and a Workflow entry in the sidebar.
Second Brain meetings: a synced recording with Echo’s meeting notes from the transcript.

Schbang · 2025 → 2026

One workspace for the agency’s knowledge, meetings and creative work

Second Brain is Schbang’s internal AI workspace: chat that knows each brand, Echo, a bot that sits in client meetings and files the notes, and workflows that turn a brief into finished work. I built AI Adapts, which takes one approved creative and resizes it for every platform without breaking the brand, shipped the post generator and QC bot, helped on the slide and PPT generators and the meetings screens, and wrote the handover when I left.

Node.js and Express on Postgres, Pinecone and S3, with a Next.js front end. I built AI Adapts end to end: brand logos and reference images, an image-analysis pass before generation, model choice, 2K and 4K upscales, progress streamed over SSE, and stuck jobs recovered when the browser disconnects. For Echo, I rewrote the transcript pipeline: audio chunks processed in parallel, speakers matched from three Recall.ai data sources, and transcripts people can edit. Also the post generator, QC bot, RAG eval and feedback dashboards, Google Drive import, and the handover docs.

Risograph print: signal rings spreading from a dot toward a device, with a row of decoded bytes between them.

Oracura Solutions · consulting, 07/26 → 09/26

One device on my desk, and no datasheet for it

A connected oral-care device with no protocol documentation. I had the hardware, so I worked out what it was saying byte by byte, wrote it down as a typed SDK, and covered it with tests so the rest of the team could build the app without the device in their hands.

Sniffed the Bluetooth Low Energy traffic off the real device, reconstructed framing, handshakes and error cases, and wrote a typed React Native SDK with 120 unit tests and a fake transport that replays captured sessions. Owned the platform end to end after that: roadmap, API architecture, review, releases, and the self-hosted infrastructure under it.

Dokploy monitoring for PlanetPulse’s servers: CPU, memory, disk and Docker usage graphs.

PlanetPulse · dokploy-selfhost-starter

The company’s software bill, replaced with servers I run

Project management, wiki, password vault, support, finance and payroll: all of it now runs on our own servers instead of per-seat subscriptions. I designed it, I operate it, and I wrote down how, so other small teams can copy it.

20+ services across three Linux servers on Dokploy and Traefik, Logto for single sign-on, Cloudflare for DNS, CDN and email authentication, offsite backups to Backblaze B2. The open-source starter carries the parts vendor docs leave out: monorepo Dockerfiles, Compose, DNS and email records, restores.

Everything so far, squashed into one pull request.

Add Hayyan Hajwani as a collaborator#612

OpenHayyan wants to mergehayyan:mainintoyour-project:main

about.md+4−2
@@ -2025,10 +2026,12 @@ Hayyan Hajwani
name: Hayyan Hajwani
base: Mumbai, IN · UTC+05:30
company: Schbang
company: PlanetPulse
role: Tech Lead, six engineers across Austria and India
builds: backend systems and the apps on top of them
infra: per-seat SaaS subscriptions
infra: 20+ self-hosted services on 3 Linux servers
practice: spec-first, ADRs, code review, tests before merge
stack: TypeScript, Python, SQL · NestJS, Express, FastAPI
React, Next.js, React Native, Expo
PostgreSQL, MongoDB, Redis, Qdrant, Pinecone
Docker, Dokploy, Traefik, AWS, Cloudflare, GitHub Actions
enjoys: problems with a clear finish line

Activity

Live

GitHub@Hayyan612 ↗

1,791contributions in the last year

LeetCode@Hayyan_Hajwani ↗

385problems solved

Easy
190
Medium
179
Hard
16

Busiest day

20 Sep 2026

190 contributions in one day.

it was a Sunday.

Streak

1 day running

Longest: 16 days, to 23 Mar 2026.

Pull requests

104 merged

10 still open. Public repos only.

Open source(15)

Live

Pull requests against repositories I do not control, reviewed by maintainers who had no reason to be kind.

6 merged and 9 in review, across 8 reposgithub.com/Hayyan612 ↗

Building something and need another pair of hands, or just curious? Write to hayyan.connect@gmail.com, or size me up on GitHub and LinkedIn first.P.S. small, well-scoped projects are my favourite kind.

A cup of coffee steaming on a wooden table by a window.
bring your own coffee

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