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Open to full-time opportunities

I build products, systems & experiences that solve real problems.

Full-stack engineer building web and mobile products from first idea through to production, across architecture, backend APIs and the interface.

4+
Years Experience
45
Products Shipped
10+
Countries Served

Tech I work with

  • React
  • Next.js
  • TypeScript
  • Node.js
  • Python
  • AWS
  • + more
Sachin Rajkumar Saini, Full-Stack Product Engineer

Selected work

Products people actually use.

Software I shipped across FoodTech, FinTech, HealthTech, EdTech, logistics and AI, owned from architecture through to release.

01Enterprise
Live

Birla Uttam Cement

Enterprise Digital Stack - Mangalam Cement

Full digital stack for an established Birla-group cement brand: a consumer mobile app, the public brand site, and two internal ERPs running trade and non-trade operations, serving 500+ daily active users.

500+
Daily users
1K+
Downloads
2
Erps
React NativeTypeScriptNode.jsReact
View case studyiOSAndroidWebAdmin
02AI & ML
Live

ImaginAI

Invoice-to-Tally Automation

AI accounting automation used by 100+ CA firms across India. It extracts data from invoices, bills and documents and syncs it straight into Tally, turning a month of manual data entry into a few minutes of review. I built the React Native mobile app.

1M+
Documents
99%
Accuracy
4x faster
Speed
React NativeExpoNode.jsOpenAI+1
View case studyWeb
03AI & ML
Live

Humwork.ai

Human Experts for AI Agents

Humans-as-a-service for AI agents. When an agent gets stuck it is connected to a verified human expert in real time over the Model Context Protocol - engineers, designers, strategists - matched in under 30 seconds. I built the web platform and the expert mobile apps.

<30s
Match time
3
Platforms
React NativeNext.jsNode.jsTypeScript+1
View case studyiOSAndroidWeb
04FoodTech
Live

OOHK

Food Ordering Platform - Hong Kong

Full-featured food ordering and delivery platform serving the Hong Kong market with multi-language support (English, Simplified Chinese, Traditional Chinese). Features scheduled orders, package menus, and multiple payment options including Stripe and PayPal.

31
Versions
3
Languages
50+
Features
React NativeTypeScriptPostgreSQLStripe+1
View case studyiOSAndroidWebAdmin
05AI & ML
Live

Shiplog

Agentic Customer Intelligence

A B2B platform that gives every customer a live profile and decides the next best action in real time, so teams expand and retain the customers they already have. Its agent, Ada, turns product and usage signals into concrete retention and expansion moves.

Next.jsTypeScriptNode.jsOpenAI
View case studyWeb
06AI & ML
Live

KhataBhai

WhatsApp AI Business Assistant

India's first WhatsApp AI assistant for small businesses. Features voice billing, photo-based invoicing, automatic payment reminders, PDF invoice generation, daily sales reports, and multilingual support - all without downloading any app.

500+
Businesses
5K+
Invoices
3
Languages
Next.jsNode.jsWhatsApp APIOpenAI+1
View case studyWeb

More than just code

How I work.

Four things I bring to a product team, learned from building software and then having to keep it running.

Product thinking

I start with the problem, the user and the constraints, so what gets built is what was actually needed.

Full-stack engineering

Frontend, mobile, backend APIs, databases and infrastructure. I can follow a feature all the way down the stack.

System ownership

I stay with a product past launch: releases, monitoring, and the changes that only become obvious once real people use it.

Continuous learning

Most projects bring a new domain: payments, real-time video, HIPAA compliance, multi-language support, AI.

Engineering stack

What I actually build with.

40 technologies I have used in production, counted across 45 shipped products.

Frontend

7
  • TypeScript22
  • React13
  • Next.js9
  • JavaScript3
  • Tailwind CSS1
  • Redux1
  • Plotly.js1

Mobile

3
  • React Native30
  • Expo1
  • CodePush1

Backend & APIs

5
  • Node.js33
  • Strapi4
  • Socket.io4
  • Python2
  • WebRTC2

Data & Security

5
  • PostgreSQL3
  • MongoDB1
  • SQL1
  • Data Analytics1
  • HIPAA Compliance1

Cloud & DevOps

4
  • AWS3
  • Vercel1
  • CDN1
  • Azure1

AI & Integrations

16
  • OpenAI5
  • Stripe4
  • AI/ML2
  • Google Maps2
  • MCP1
  • Microsoft Copilot Studio1
  • Power Platform1
  • OCR1
  • Razorpay1
  • PayPal1
  • Financial APIs1
  • WhatsApp API1
  • CometChat1
  • Video Processing1
  • Google Places1
  • Zoho CRM1

Experience

Building products since 2022.

2022 – Present

Product Engineer · Full-Stack Developer

Independent Product Development

Designed and shipped production web and mobile products across FoodTech, FinTech, HealthTech, EdTech, logistics and AI. Owned architecture, frontend, backend APIs, databases, payments, real-time systems, deployment and release engineering.

  • Architected and deployed production applications used across 10+ countries with multi-language support
  • Built real-time communication systems with WebRTC and Socket.io for live consultation products
  • Integrated Razorpay, Stripe, PayPal and Apple Pay, including subscription billing
  • Shipped 100+ app releases to the App Store and Play Store, with over-the-air updates via CodePush
  • Built AI features on OpenAI, including RAG chatbots and OCR document processing

Selected products

Food delivery (Hong Kong)Healthcare securityShort-video platformReal-estate matchingWhatsApp AI assistant
2020 – 2024

B.Tech, Information Technology

Poornima College of Engineering, Jaipur

What I'm looking for

Where I'd like to do this next.

I want to join a product team where I can own real engineering problems, build systems that go into production, and stay with them long enough to make them better.

Product companies

Own features end to end on software people rely on, and stay with them long enough to see how they hold up.

Startups

Ambiguous problems, short feedback loops, and a say in what gets built as well as how.

Engineering teams

Work on scalable systems with people who take code review and code quality seriously.

Open to full-time product engineering roles

Get in touch

Contact

Let's build something meaningful.

Got an engineering problem worth solving, or a role you think I'd fit? I read every message.