Full Stack & AI Systems Engineer

I build AI and realtime systems that actually reach production.

These days my work is mostly around healthcare AI, React Native, WebSockets, RAG, agent workflows, and the backend pieces that keep everything reliable.

Hire me View case studies

Turn unclear product ideas into working AI workflows with agents, RAG, tools, and fallbacks.

Build realtime chat, voice, WebSocket, Pixel Streaming, and MetaHuman flows where latency matters.

Take React Native and full-stack products from first version to something teams can keep shipping.

Teams I have worked with

Apollo 24|7

Audvice

Vested Finance

CityMall

rtCamp

Upwork Top Rated Plus

HI! I'M

Current focus

Realtime healthcare orchestration & cross-platform consumer apps.

200K+

daily AI healthcare events the system was designed to handle

30K+

daily sessions through MetaHuman and Pixel Streaming flows

government hospital pilots where the CDSS work was tested

8+ years

writing, shipping, and maintaining production software

So, the way I usually work is simple:understand the actual problem,build the smallest useful version,and then make it solid enough for production.

Services

What I can help with

If you have an idea, a slow product flow, or an AI system that is hard to make reliable, this is the kind of work I can take care of.

AI systems and orchestration

I work on LangGraph, LlamaIndex, RAG, tool routing, guardrails, fallbacks, and the backend flow around it.

Realtime healthcare apps

Chat, voice, WebSockets, streaming UI, MetaHuman handoff, and patient-facing flows that need to respond fast.

React Native product engineering

Deep links, analytics, VoIP, performance, release setup, and the kind of mobile work where small bugs hurt users.

Full-stack startup builds

Next.js, Node.js, PostgreSQL, Redis, AWS, CI/CD, and enough product sense to ship without waiting for perfect specs.

How I work

I like building the boring reliable parts properly.

First, make the flow clear enough that everyone understands it.

Then, ship a small working version instead of waiting too long.

After that, add fallbacks, logs, limits, and the production details.

Work

Work 1

Built a realtime healthcare AI companionwith doctor MetaHuman, agents, and WebSocket orchestration

This was an NDA project, so I cannot show the product directly. But the main work was simple to explain: make patient conversations useful, grounded, and fast.

What was the problem?

The system had to support high-volume chat and voice sessions, keep clinical answers grounded, and hand off to a MetaHuman experience without making the user wait.

What I built

I built LangGraph multi-agent flows for symptom intake, retrieval, reasoning, tool routing, response composition, and fallback handling.
I added RAG over structured EHR-like data, unstructured notes, clinical guidance, embeddings, and vector search.
I connected Node.js WebSocket orchestration with MetaHuman and Pixel Streaming so the virtual assistant could feel realtime.

What changed

The architecture was planned for 200K+ daily AI interaction events.
The MetaHuman and Pixel Streaming flow powered 30K+ daily patient sessions.
I led a small 3-person engineering team while still staying hands-on.

Role

AI Systems Engineer, Realtime Platform

Timeline

Dec 2024 - Present

Discuss Project

Work 2

Worked on Apollo 24|7 mobile journeysanalytics, deep links, VoIP support, and React Native performance

At Apollo 24|7, most of the work was around making important mobile flows more reliable. In healthcare apps, even a small broken journey creates a lot of friction.

What was the problem?

The app needed cleaner marketing attribution, better referral and deep-linking flows, and a smoother way for patients to connect with support.

What I built

I fixed CleverTap and AppsFlyer funnel inconsistencies that were creating tracking gaps.
I refactored deep linking and referral flows using AppsFlyer Universal Links.
I built in-app VoIP patient-to-support communication and worked on app architecture and performance improvements.

What changed

Marketing analytics became more reliable and easier to trust.
Onboarding, referral, and support journeys became easier to debug and maintain.
I mentored engineers while shipping production React Native work.

Role

Senior Software Developer, React Native

Timeline

Aug 2023 - May 2025

View Work

Work 3

Built products with startups across marketsAudvice, Jitera, Vested Finance, CityMall, rtCamp

Before healthcare AI became my main focus, I worked across audio learning, fintech, commerce, internal tools, and early product teams.

What was the problem?

Most teams had the same kind of problem: the idea was there, but someone had to turn it into clean mobile, web, backend, and cloud work.

What I built

I built Audvice mobile and web surfaces from 0-to-1 with audio capture, notifications, deep links, and release pipelines.
I modernized Vested Finance React Native and Next.js surfaces with better state, data, caching, and dashboard patterns.
I shipped CityMall customer/vendor apps, Vue/Nuxt admin tooling, and event-driven backend workflows.

What changed

I shipped production systems across healthcare, fintech, commerce, and creator tools.
I handled async workloads with AWS Lambda, S3, RabbitMQ, Redis, Bitrise, and AppCenter.
This is where most of my 8+ years of practical product engineering comes from.

Role

Full-stack Developer, Consultant

Timeline

8+ years

Start a Conversation

Timeline

Experience

Here is the work timeline, from current AI and healthcare work back to the early React and full-stack projects.

Lead AI Engineer

Contract

Stealth AI Health Startup

Remote

Dec 2024 - Present

Founder

Sushruta Health

India - sushrut.health

May 2025 - Jan 2026

Lead Engineer

Consultant

SCADA ISG

Remote - isg-us.com

Apr 2025 - Nov 2025

Senior Full Stack Mobile Developer

Contract

Beehive

Remote - beehive.io

Oct 2024 - May 2025

Tech Lead

Remote

HackerLabs

Dharamshala - hackerlabs.in

Oct 2024 - Feb 2025

Lead Mobile Developer

Hybrid

Apollo 24|7

Gurugram - apollo247.com

Aug 2023 - Mar 2025

Full Stack Developer

Contract

Audvice

Salzburg - audvice.com

May 2021 - Aug 2023

React Native Developer

Contract

Jitera

Tokyo - jitera.com

Apr 2021 - May 2021

Full Stack Developer

Contract

Vested Finance

California - vestedfinance.com

Nov 2020 - May 2021

Software Developer

CityMall

Gurugram - citymall.live

Dec 2019 - Dec 2020

Frontend Developer

Contract

WorkerB

California

May 2020 - Sep 2020

React Developer

rtCamp

Pune - rtcamp.com

Apr 2019 - Dec 2019

About me

Hi, I'm Praveen Kumar Saini, an India-based developer with 8+ years of experience building product software across healthcare, finance, commerce, and creator tools.

I like the whole path from product thinking to production. First, understand what is actually breaking, then build the interface, and then make the backend strong enough that the team can trust it.

Right now, most of my focus is AI-enabled healthcare products, realtime systems, and software that helps teams move with more clarity.