Frontend & Full-Stack Developer

Hi, I'm Sandesh Upadhyay

Sandesh Upadhyay – Ship products that scale. Build experiences users love.

Ship products that scale.

Build experiences users love.

I help startups and product teams turn ideas into production-ready web apps—from pixel-perfect UIs to scalable backends. Clean code, clear UX, on-time delivery.

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About Me

Journey, mindset, and what I bring to your team

Full-Stack Developer with hands-on experience building and scaling web applications. I started with front-end and design, then moved into backend, databases, and deployment—so I can own a feature from idea to production. I've shipped for 10K+ users, cut release time with automation, and built teams from the ground up through hiring and mentoring.

What I Do

I design and build production-ready web apps—responsive UIs, APIs, auth, payments, and real-time features. I focus on clean architecture, performance, and maintainable code so your product can scale.

Frontend & Full-Stack · Next.js, React, Node, TypeScript

Who I Work With

Startups, product teams, and founders who need a developer who can own the full stack, ship on time, and communicate clearly with non-technical stakeholders.

Open to full-time, contract, and project-based work

How I Work

Performance-first

Code splitting, lazy loading, and optimized delivery.

Outcome-driven

Ship on time; metrics like 10K+ users and 25% faster load.

Full stack ownership

From UI to API and DB—design, build, deploy.

Team multiplier

Mentoring, code reviews, and clear stakeholder communication.

Stack I use

Technologies I work with to build products that solve real problems

JavaScript
JavaScript
TypeScript
TypeScript
Python
Python
SQL
SQL
React.js
React.js
Next.js
Next.js
Express.js
Express.js
Node.js
Node.js
FastAPI
FastAPI
Tailwind CSS
Tailwind CSS
MongoDB
MongoDB
PostgreSQL
PostgreSQL
Redis
Redis
Git
Git
AWS
AWS
Google Cloud
Google Cloud
JavaScript
JavaScript
TypeScript
TypeScript
Python
Python
SQL
SQL
React.js
React.js
Next.js
Next.js
Express.js
Express.js
Node.js
Node.js
FastAPI
FastAPI
Tailwind CSS
Tailwind CSS
MongoDB
MongoDB
PostgreSQL
PostgreSQL
Redis
Redis
Git
Git
AWS
AWS
Google Cloud
Google Cloud

Experience

Where I've built and shipped

Software Developer

Techpotli

New Delhi (Remote)·August 2025 - Present
ReactNode.jsPostgreSQL
  • ▹Developed and optimized key modules of the company's e-commerce platform, improving load time and streamlining transactions.
  • ▹Took complete ownership of an independent project, designing its architecture, leading development, and deploying it successfully within deadlines.
  • ▹Conducted 10+ technical interviews, shortlisted candidates, and built a 5-member development team from scratch.
  • ▹Managing and mentoring the team by assigning tasks, reviewing code and ensuring 100% on-time delivery of project milestones.
  • ▹Acted as a bridge between project managers, stakeholders, and developers, ensuring business goals were consistently met.
  • ▹Enhanced team productivity and collaboration, reducing issue resolution time by 30% through streamlined workflows.

Full-Stack Developer

FusionFame Digital Private Limited

Gurgaon (Remote)·June 2025 - July 2025
React.jsNext.jsNode.jsFirebaseClerk
  • ▹Delivered full-stack features with React.js, Next.js, Node.js, and Firebase, scaling the app to 10K+ monthly users.
  • ▹Boosted performance by 25% through code splitting, lazy loading, and optimized asset delivery.
  • ▹Integrated Clerk authentication, payments, and order tracking to launch a secure, production-ready MVP.
  • ▹Automated deployments via GitHub Actions + Vercel, cutting release time by 60%.

Full-stack Developer Intern

The Boring Education

Remote·December 2024 - May 2025
React.jsNext.jsTypeScriptSupabase
  • ▹Developing and maintaining scalable educational applications using React.js, Next.js, TypeScript, and Supabase.
  • ▹Implementing responsive UI components and enhancing user experience with interactive features.
  • ▹Collaborating with cross-functional teams to integrate AI-driven solutions for personalized learning.
  • ▹Conducting code reviews, debugging, and optimizing application performance for scalability and efficiency.

Technical Support Associate

Tech Mahindra Ltd.

Noida, India·October 2024 - February 2025
  • ▹Diagnosed and troubleshot technical issues related to e-commerce platforms, ensuring seamless user experience.
  • ▹Worked on bug identification, debugging, and issue resolution for payment processing, website navigation, and order fulfillment.
  • ▹Collaborated with internal teams to enhance platform stability, reduce downtime, and optimize system performance.
  • ▹Analyzed customer-reported technical problems, generated actionable insights, and suggested improvements to automate workflows.

Web Developer

Internship Studio

Remote·November 2023 - February 2024
HTML5CSS3JavaScriptjQuery
  • ▹Designed and developed responsive websites using HTML5, CSS3, JavaScript, and jQuery, ensuring cross-browser compatibility.
  • ▹Integrated dynamic front-end features like animations, sliders, and interactive elements to enhance UI/UX.
  • ▹Conducted testing and debugging to improve website performance and usability.
  • ▹Collaborated with designers to convert mockups into functional web interfaces, ensuring alignment with brand guidelines.

Education

Academic background

Bachelor of Arts

Veer Bahadur Singh Purvanchal University

Uttar Pradesh, India·2020 - 2023

Work

Personal products I built end-to-end, and open-source projects I contribute to

Personal Projects

Products I designed, built, and shipped independently

Latency Topology Visualizer

Problem

Teams need to understand latency and topology across cloud providers and exchanges to make placement and routing decisions—data is scattered and hard to compare in one place.

Solution

Designed and built an end-to-end product that visualizes latency topology using Cloudflare API: real-time and historical views, filter by cloud provider (AWS, GCP, Azure) and region, heatmap and list views, and export to CSV/PNG. Built for performance and clear UX for technical users.

Outcome

A single place to compare latency across regions and exchanges; supports real-time and historical analysis with a minimal, focused interface. Owned from architecture to deployment.

Tech
ReactTypeScriptCloudflare APIVercel
View Live

E-Signature Application

Problem

Users needed a simple way to sign documents digitally without leaving the browser or installing extra software.

Solution

Built a canvas-based e-signature app with document upload, smooth drawing for signatures, and secure save/export so users can sign and store documents in one place.

Outcome

Intuitive signing flow and reusable canvas component; strong feedback on UX and performance.

Tech
ReactJavaScriptCanvas API
View Live

Modern URL Shortener

Problem

Long URLs are hard to share and track; users want quick shortening and a clean, reliable experience.

Solution

Designed and built a responsive URL shortener with instant shortening, copy-to-clipboard, and local history—focused on speed and a modern, accessible UI.

Outcome

Sleek product suitable for sharing; featured on Product Hunt. Responsive and performant across devices.

Tech
ReactTypeScriptTailwindCSS
View LiveProduct Hunt

Open Source Contributions

Projects I contribute to; working within existing codebases and communities

Open Source Contribution

OpenSox

Community project I contribute to (not my own). Original by Opensox AI / apsinghdev.

What it does

A platform that helps developers discover open-source projects to contribute to based on their criteria—so you can start contributing in seconds, not days. Built with Next.js, tRPC, Prisma, and NextAuth.

My contributions

Contributing to the frontend and tooling; working across the Turborepo monorepo to add features, improve DX, and align with maintainer priorities and code style.

Working in the codebase

Navigating an existing monorepo (apps + packages), following established patterns, reading and extending tRPC APIs and Prisma schema, and shipping changes that fit the project’s architecture and conventions.

Tech
Next.jsTypeScriptTailwindPrismaNextAuthTurborepo
GitHubLive

Consistency & Open Source Activity

How I Build

Capabilities that ship products—tools in support of outcomes.

Product Engineering

Ship features end-to-end: from requirements and architecture to deployment. I focus on scope, timelines, and outcomes—not just code.

Next.jsReactTypeScriptVercelGitHub Actions

AI-Ready Application Development

Integrate LLMs, embeddings, and AI APIs into real products. Build interfaces that handle streaming, context, and clear UX around AI features.

OpenAI APIsStreamingSupabaseEdge runtimes

Frontend Engineering

Responsive, accessible UIs with fast load and smooth interaction. Component-driven design and state management that scales with the product.

ReactNext.jsTailwindShadcn/UIRedux

Backend Engineering

APIs, auth, and server logic that support product needs. REST and GraphQL, serverless and Node, with security and performance in mind.

Node.jsExpressFastAPIGraphQLRESTJWTOAuth

Data & Persistence

Model data, choose the right store, and keep apps fast. Relational and document DBs, real-time subscriptions, and simple caching when needed.

PostgreSQLMongoDBSupabaseFirebaseMySQL

Developer Workflow

Version control, CI/CD, and environment discipline. Ship often with automated checks and clear ownership of production.

GitGitHubVercelPostman

Let's Work Together

Open to full-time, contract, and project-based work. I respond within 24 hours.

Get In Touch

Phone

+91-7523975038

Available for calls

Email

upadhyaysandesh28@gmail.com

I'll respond within 24 hours

Connect With Me

LinkedIn

Professional network

GitHub

Code repositories

Twitter

Follow me on X

Email, LinkedIn, and GitHub — all in one place.

upadhyaysandesh28@gmail.comLinkedInGitHub