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Arjun Singh

Open to work

Arjun Singh

Full-stack engineer building production web applications.

From Fastify APIs and PostgreSQL to React interfaces.

View my work Résumé
The PG in Kokrajhar home page, with a booking headline, resident and room counts, and a photo of a furnished room.
PGSinKokrajhar: Booking platform for PG accommodation, with listings, availability and role-based accounts.

Selected work

Things I've built

Pexit

Image coming soon

Pexit

Professional networking platform with authentication, a social graph and feeds.

What I built
I built the authentication rebuild, the Neo4j social graph and the posts and feed module, end to end from schema to React UI.
Outcome
Companies, Profiles, Listings and Posts migrated to a multi-bucket asset service, with every backend module documented in OpenAPI and covered by unit and real-Postgres integration tests.
  • Fastify
  • PostgreSQL
  • Neo4j
  • Redis
  • React
The PG in Kokrajhar home page, with a booking headline, resident and room counts, and a photo of a furnished room.

PGSinKokrajhar

Booking platform for PG accommodation, with listings, availability and role-based accounts.

What I built
I built the whole product on Next.js, Sanity and Supabase, including listing management and role-based sign-in.
Outcome
Live at pginkokrajhar.com, where the owner manages listings and guests check availability online.
  • Next.js
  • Sanity
  • Supabase
Visit site (PGSinKokrajhar)

HorizonVision Group

Image coming soon

HorizonVision Group

CMS-driven site for a video production agency.

What I built
I designed the Sanity content model and built the site on top of it.
Outcome
The agency now edits its marketing copy in the CMS without code changes.
  • Sanity
  • Next.js
Visit site (HorizonVision Group)

Experience

Where I've worked

  1. Software Engineer, Full Stack

    – Present

    Updot · Pexit

    • Rebuilt authentication end to end: split access and refresh JWTs bound to Redis sessions, AES-256-GCM token encryption, and OTP and global rate limiting.
    • Built the Neo4j social-graph module that powers connections, mutual-connection lookups and recommendation candidates.
    • Built the posts, comments and feed module on Fastify and PostgreSQL, with visibility rules and blocking-aware feeds, plus its React UI.
    • Fastify
    • TypeScript
    • PostgreSQL
    • Neo4j
    • Redis
    • React
    • Nx

  2. Freelance Frontend Engineer

    –

    Self-employed · Remote

    • Delivered two client products end to end, from requirements to deployment: PGSinKokrajhar, a booking platform, and HorizonVision Group, a CMS-driven agency site.
    • Next.js
    • Sanity
    • Supabase

  3. Software Engineer (Frontend / CMS)

    –

    Koru UX Design · JSCAPE MFT SaaS

    • Led the React and Next.js modernisation of the product frontend, integrated with Sitecore CMS.
    • Redesigned 20+ enterprise screens onto a shared, CMS-driven component system for consistent workflows.
    • Designed and integrated REST APIs with the backend team for data- and CMS-driven workflows.
    • React
    • Next.js
    • Sitecore

  4. Software Engineer (Frontend / CMS & Commerce)

    –

    Incero.ai

    • Built Next.js and TypeScript applications on Sitecore, Contentful, Sanity and Strapi.
    • Developed composable commerce on Sitecore OrderCloud, with JWT authentication and role-based access control.
    • Moved CMS pages to SSR/ISR and split client bundles to cut shipped JavaScript.
    • Next.js
    • TypeScript
    • Sitecore
    • Contentful
    • OrderCloud

Education

  • B.Sc. Computer Science, Gauhati University · 2020 · CGPA 8.9/10
  • Full-Stack Development Program, Coding Ninjas · 2026 – present · Java, Spring Boot, DevOps

About

A bit about me

I like owning a feature completely, from the database schema and the API to the tests and the interface people actually use. Lately that has meant authentication, social graphs and feeds on Fastify, PostgreSQL, Neo4j and Redis. Before that I built CMS-driven frontends for enterprise teams on Sitecore, Contentful and Sanity.

Experience
2+ years shipping production systems
Location
India · Open to relocation / remote
Currently
Updot, Pexit

Skills

Backend

Frontend

Delivery

  • Testing (Vitest, Playwright, RTL, MSW)Used in Pexit
  • Nx and pnpm monoreposUsed in Pexit
  • OpenAPI documentationUsed in Pexit
  • Vercel, Cloudflare Workers, AWS, Docker

Let's work together.

I'm open to new full-stack roles in India, with relocation, or remote. Email is the fastest way to reach me.

arjun40779@gmail.com