Shopify App Store
WishVault
Save-for-later wishlist app delivered through a Theme App Extension, with merchant analytics and credit-metered subscription billing.
- Remix
- Prisma
- PostgreSQL
- Billing API
Available for Full Stack / SDE rolesFull Stack Developer · Noida, India
I'm Arjun Singh.
I ship products in public.
Three published Shopify App Store apps, a VS Code Marketplace extension, and Split2Ship — the merchant payment app I lead at DesignOmate. I own features from schema design through production support.
- Years shipping
- 3
- Shopify apps published
- 3
- VS Code extension
- 1
- Customer growth driven
- 50%
Shipped
Published work
Products live on public marketplaces, plus the app I lead day to day.
Shopify App Store
PulseBar
No-code announcement bars, countdown timers, and marquees — sticky, rotating, and scheduled campaigns with Brevo and Klaviyo sync.
- React Router v7
- PostgreSQL
- Upstash Redis
VS Code Marketplace
EnvCompare
Diffs environment-variable keys across every .env variant in a workspace and suggests the missing ones inline — without ever transmitting values.
- TypeScript
- VS Code API
- Node.js
Leading at DesignOmate
Split2Ship
Merchant payment app offering full, partial, and COD checkout options. I own the roadmap, the schema, and production support.
- Remix
- TypeScript
- Prisma
- PostgreSQL
Every one of these was designed, built, and shipped end to end — schema through production support.
About
From schema design to production support
Full Stack Developer who ships products in public.
I'm Arjun Singh, a Full Stack Developer based in Noida. I currently work at DesignOmate, where I lead development of Split2Ship — a Shopify app that lets merchants offer flexible checkout payments: full, partial, and COD.
I own features end-to-end: schema design with Prisma and PostgreSQL, Remix and TypeScript on the frontend, payment flows, and production deployments. Owning the roadmap and supporting merchants directly helped drive about 50% customer growth.
Before that, at Lesus Innovations, I built full-stack features for ZapNow and ZapHub — products serving 500+ daily active users. I integrated Axis and Fino Bank payment APIs at a 99.9% transaction success rate and helped keep the platform at 99.8% uptime. Earlier at TechPyro, I worked on React and Next.js interfaces and scaled Node.js services for 10,000+ concurrent users.
Outside of work I like shipping products in public — WishVault and PulseBar on the Shopify App Store, EnvCompare on the VS Code Marketplace, a Notion-backed CMS blog, and a real-time collaborative Notion clone.
- Based in
- Noida, India
- Currently
- Full Stack Developer at DesignOmate
- Education
- B.Tech in Computer Science, Gurukula Kangri University
- Focus
- React · Next.js · Remix · Node.js · PostgreSQL
Experience
Where I've shipped
Three roles across payments, marketplaces, and high-traffic services.
Full Stack Developer · DesignOmate
Dec 2025 — PresentNoida, India
Leading development of Split2Ship, a Shopify app that gives merchants flexible payment options at checkout.
- Developed verification-related pop-up flows on product pages using React, Remix, and TypeScript to streamline user verification and improve checkout completion rates
- Designed and integrated multiple payment options (full, partial, COD) into the Split2Ship Shopify app using Remix, Prisma, and PostgreSQL, owning each feature from schema design through independent production deployment
- Drove 50% customer growth by owning the product roadmap and resolving customer-reported production issues end-to-end as the primary point of contact
- Remix
- TypeScript
- React
- Prisma
- PostgreSQL
- Polaris
- Admin GraphQL
Full Stack Developer · Lesus Innovations
May 2025 — Sep 2025Delhi, India
Built and maintained full-stack features for ZapNow and ZapHub, serving 500+ daily active users.
- Developed and maintained full-stack features for ZapNow and ZapHub, serving 500+ daily active users; built scalable backend APIs and admin dashboards with 99.8% uptime
- Integrated secure payment workflows in Node.js and Express using Axis and Fino Bank APIs, processing 100+ monthly transactions at a 99.9% success rate; improved scalability 25% and cut production bugs 30%
- Node.js
- Express
- React
- Next.js
- PostgreSQL
- MongoDB
- Docker
- AWS
Software Engineer · TechPyro
Jun 2023 — Nov 2023Haridwar, India
Built React and Next.js interfaces and scaled the Node.js services behind them.
- Built React and Next.js interfaces with MUI and Shadcn UI, and scaled the Node.js services behind them to support 10,000+ concurrent users
- Reduced page load time by 45% through code splitting and lazy loading; optimized Node.js REST APIs to cut response time by 40% and add 2,000 requests/minute of throughput
- React
- Next.js
- Node.js
- MUI
- Shadcn UI
Projects
Things I built end to end
Marketplace apps, developer tooling, and full-stack products — each owned from schema to deploy.
WishVault
WishVault
Shopify App StorePublished Shopify App Store wishlist app
- Delivers the wishlist drawer through a Theme App Extension so it installs on any merchant theme without code changes, with guest wishlists that persist saves without an account
- Merchant analytics dashboard surfacing most-wishlisted products as buying-intent signal, plus automated reminder emails that bring shoppers back to saved items
- Credit-metered subscription billing across three tiers (free, $5, $10, with annual plans) on the Shopify Billing API, gating customization and email features per plan
- Remix
- TypeScript
- Prisma
- PostgreSQL
- Polaris
- Theme App Extensions
- Billing API
EnvCompare
EnvCompare
VS Code MarketplacePublished VS Code Marketplace extension
- Diffs keys across .env and every .env.* variant in a workspace, reporting exactly which keys each file is missing
- Inline completion provider suggests missing keys as Tab-to-accept snippets, backed by debounced file watchers that warn the moment a workspace goes out of sync
- Compares key names only and never transmits values, so secrets stay on the local filesystem
- TypeScript
- VS Code Extension API
- Node.js
Notion CMS Blog
Notion CMS Blog
Notion-backed publishing platform
- Posts are authored in Notion and go live the moment their status flips to Published, with the filter applied server-side in the Notion API query so drafts never reach the client
- Statically generated listing and post pages with ISR revalidation, so published edits appear without a redeploy while pages keep serving from cache and requests stay inside Notion's API rate limits
- Maps Notion's nested block tree and loosely typed database properties into typed React components to render rich text, headings, and embeds
- Next.js
- TypeScript
- Notion API
- ISR
- Vercel
Jotion
Real-time collaborative Notion clone
- Real-time collaborative document editing on Convex live queries, supporting 100+ concurrent editors with changes propagating to every client without a refresh
- Nested document hierarchy with dynamic routing and Clerk-backed authentication, scoping each user's workspace tree so every document is individually addressable
- Next.js 13
- TypeScript
- Clerk
- Convex
PulseBar
PulseBar
Shopify App StorePublished Shopify App Store announcement bars
- Sticky, scrolling, rotating, and marquee announcement bars with countdown timers, campaign scheduling, and page or device targeting
- Brand customisation for fonts, colours, buttons, and animations; email capture syncs with Shopify Email, Brevo, and Klaviyo
- Published to the Shopify App Store with Free, Pro ($10/mo), and Advanced ($17/mo) plans
- React Router v7
- PostgreSQL
- Upstash Redis
GangaClean
GangaClean
Volunteer-management dApp
- Three on-chain roles enforced through OpenZeppelin AccessControl, separating organizers, verifiers, and volunteers
- Pull-payment reward flow so volunteers withdraw earned rewards themselves rather than relying on a push transfer
- Solidity
- OpenZeppelin
- Hardhat
- Ethers.js
Stack
What I build with
Grouped the way I actually use them — product surface, data layer, and everything that gets it to production.
Frontend
- React
- Next.js
- Remix
- TypeScript
- JavaScript (ES6+)
- HTML5
- CSS3
- Tailwind CSS
- Shadcn UI
- MUI
- Redux Toolkit
- Zustand
- Recoil
Backend & Data
- Node.js
- Express.js
- REST APIs
- WebSockets
- Socket.io
- PostgreSQL
- MongoDB
- Prisma ORM
- Redis
- SQL
- NoSQL
Cloud & DevOps
- AWS (EC2, S3)
- Vercel
- Docker
- Linux
- Git
- GitHub
- CI/CD (GitHub Actions)
- JWT
- RBAC
Shopify & Payments
- Polaris
- App Bridge
- Theme App Extensions
- Admin GraphQL API
- Billing API
- Razorpay
- Axis Bank API
- Fino Bank API
Other
- VS Code Extension API
- Solidity
- OpenZeppelin
- Hardhat
- Ethers.js
- Web3.js
Open source
Contributions in the open
Merged work on tools other developers depend on.
Hacktoberfest 2023
Open source contributor across multiple repositories.
- 5 merged PRs across repositories, improving code quality and documentation
- Added 8 features and collaborated with global developers on code reviews and open-source best practices
Education & credentials
Where I learned the fundamentals
B.Tech in Computer Science
Gurukula Kangri University · Haridwar, India
2021 – 2025GPA 8.1
Jun 2023
SQL (Basic) Certificate
HackerRank
Jun 2023
MERN Stack Certification
CodeHelp — Love Babbar
Oct 2023
Hacktoberfest 2023
Open source contributions
Now
What I'm on right now
A snapshot of current work, current learning, and what I'm looking for next.
Building
Split2Ship at DesignOmate — flexible checkout payments for Shopify merchants
Learning
Deepening DevOps and cloud — AWS, Docker, and CI/CD pipelines
Ask me about
React, Next.js, Remix, Node.js, TypeScript, PostgreSQL, Prisma, and Shopify apps
Open to
Full Stack / SDE roles at product companies and startups
Contact
Let's build something
Open to Full Stack / SDE roles at product companies and startups. The fastest way to reach me is email.
Based inNoida, India
Download resume