Available · Full-time or contract

Kalam Pinjar

Full-Stack Developer · currently at Tech Sonic

I build products end to end: the interface, the API behind it, and the parts that break under real auth, real payments and real traffic. I came to this through a cyber security degree, which is why the work below tends to involve the parts most portfolios skip.

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Open to: Full-time · Contract
Works across: Frontend · Backend
Background: Cyber Security
Based in: Navi Mumbai

01AI / SaaS

DocQuery

Upload a PDF, ask it questions, get answers grounded in the document.

A retrieval-augmented SaaS: PDF ingestion, vector search and streamed answers, with a free tier and a paid plan.

External services wired: 7External services wired
Hand-written API types: 0Hand-written API types
Embedding providers compared: 2Embedding providers compared

Ingestion and retrieval path

01UploadUploadThing
02Parsepdf-parse
03Chunkoverlap window
04EmbedOpenAI / Cohere
05IndexPinecone
06Retrievetop-k + context
07StreamAI SDK

Next.js 14
TypeScript
tRPC v11
Prisma
PostgreSQL
Pinecone
LangChain
+7 more

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02Commerce

Commerce Platform

A headless admin that runs many stores, and a storefront that consumes it.

Two deployable Next.js apps over one API — multi-store management, Stripe checkout, and per-store data isolation.

Deployable applications: 2Deployable applications
Shared headless API: 1Shared headless API
Stores per admin instance: NStores per admin instance

Request path for a purchase

01StorefrontNext.js
02Store APIscoped by id
03PrismaPostgreSQL
04CheckoutStripe
05Webhookidempotent
06Orderpersisted

Next.js 14
TypeScript
Prisma
PostgreSQL
Stripe
Server Actions
Zustand
+3 more

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What I do

Four things, and the reason each one matters.

Interface

The layer people actually touch — and the one that decides whether the rest of it gets used.

React 19 · Next.js App Router
Design systems & tokens
Motion with a reduced-motion path
WCAG 2.2 AA, keyboard-first

Product back end

The server side owned properly — schema, endpoints, jobs — not just enough to unblock the frontend.

NestJS · Node
tRPC · REST design
Prisma · PostgreSQL
Docker · Linux · WSL
AWS · Azure · Vercel

Money & identity

The flows where a bug is not a visual defect but a support ticket with a refund attached.

Stripe Checkout & subscriptions
Idempotent webhook handling
Clerk · Kinde · session design
Server-enforced plan limits

Confidence

The reason I can change something on a Friday. My degree was in security; that habit came with it.

Playwright end-to-end
Zod at every boundary
TypeScript, strict, no escape hatches
Threat-modelling the obvious things

Also built

The rest of the shelf

All 8 projects

Real-time
2024
Discord Clone
Three transports in one application: HTTP for history, WebSocket for messages, WebRTC for calls.
3Concurrent transports
- Next.js 14
- TypeScript
- Clerk
- Prisma
- +6
Case studyCode
Client work
2025
Al-Birr
Programmes, publications and online donations for a socio-religious trust — the one project here with real users.
8Programme areas
- Next.js
- TypeScript
- Tailwind CSS
- Vercel
Case studyLive
Security
2024
CipherWeb
Encrypt and decrypt with ten algorithms — Caesar and Vigenere through to Blowfish and RSA — with Firebase-backed storage.
10Ciphers implemented
- JavaScript
- Tailwind CSS
- Canvas 2D
- Firebase
Case studyCode
Productivity
2024
E-Doc
Document handling where the slow work runs as retryable background jobs, with dashboards over the results.
4External services wired
- Next.js 14
- TypeScript
- Clerk
- Prisma
- +4
Case studyLive Code

Got something worth building?

Full-time, contract, or a freelance brief — frontend, backend or the whole stack. The fastest way to reach me is email, and I reply to everything that is not a template.

Start a conversation owaiskal57@gmail.com