Dhaka, Bangladesh · UTC+6 · remote-ready

Full-stack product engineerAI products in production.

RAG pipelines, SSE-streaming interfaces, and the billing systems around them. About three years shipping production SaaS used by 100k+ people, end to end.

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Selected work

Case studies

Affpilot

AI auto-blogging SaaS. I was top contributor to the React architecture that carried it from early stage to 100k+ users.

Frontend React Developer · Oct 2023 - Sep 2025

1M+ articles100k+ users~$390K processedCase study

Device-Lifecycle Platform

Device registry, warranty automation, AI support triage, and a RAG chatbot for a German neurofeedback manufacturer. I led development as top contributor.

Full Stack Developer · Sep 2025 - Present

445 devices417 clinics3 portalsCase study

School Management Platform

The complete system behind a 1,000-student school: biometric attendance, results, fees, Bengali PDFs, and guardian SMS. Designed, built, and operated by one engineer.

Freelance Software Developer · 2025 - Present · part-time

1,000+ students2-3k punches/day7 user rolesCase study

Projects

Open source & personal

DSA Visualizer

19★ open source

Algorithm visualizer with a play/pause/step/scrub engine, synchronized pseudocode highlighting, live pointer and operation-count tracking, and C++/Python/JavaScript/TypeScript code panels.

Next.js 16 · Tailwind CSS 4

Live GitHub Write-up

Brain Booming

Live AI tool suite

11 AI writing & utility tools: Gemini structured prompts, Tesseract.js OCR, Auth.js v5 (Google OAuth + magic links), per-user activity dashboards, Sentry monitoring, Vitest tests.

Next.js 15 · React 19 · Gemini · MongoDB

Live GitHub

ParcelOne

Real-time logistics

Parcel-delivery platform with live courier tracking (Socket.io location events synchronized into RTK Query caches) and role-based dashboards for merchants, couriers, and admins.

React · RTK Query · Socket.io · Node.js

Live GitHub

Writing

dev.to/salsadsid

Jun 2026

I built a Sorting Visualizer you can actually step through (bars, pointers, pseudocode & confetti)

How the step engine behind my DSA Visualizer works: generator-produced steps, synced pseudocode highlighting, and live pointer tracking.

dev.to

Nov 2025

Zustand: A Lightweight State Management Library (No Boilerplate Needed)

A practical introduction to Zustand: stores, actions, localStorage persistence, and Redux DevTools debugging.

dev.to

Sep 2024

Building a 2D Array Visualizer with React: A Step-by-Step Guide

Building an interactive 2D array grid in React: input validation, rendering logic, and per-cell styling.

dev.to

All posts on dev.to

Experience

Sep 2025 - Present

Full Stack Developer · AlgoSoft Technologies Limited

Leading development (top contributor, 1,100+ commits) of a device-lifecycle platform for a German medical-device manufacturer: 445 devices across 417 clinics.
Shipped the warranty-renewal pipeline, AI email triage, RAG support chatbot, Shopify event broker, and an LMS with an AI quiz generator.

Read the case study

Oct 2023 - Sep 2025

Frontend React Developer · Affpilot

Top contributor (~920 of 1,860 commits) to the React architecture behind 1M+ AI-generated articles for 100k+ users.
Built the generation workflows, write-to-publish pipeline, and billing that processed ~$390K; founding frontend engineer of Flippium (79% of commits).

Read the case study

2025 - Present · part-time

Freelance Software Developer · H.A.K Academy

Designed, built, and operate a school platform solo: 1,000+ students, seven user roles, biometric attendance at 2,000-3,000 punches a day.
Bengali PDF pipelines, a GPA/results engine with rollback, and rate-limited guardian SMS with an emergency kill switch.

Read the case study

Stack

What I ship with

Languages

JavaScript, TypeScript, SQL

Frontend

React 18/19, Next.js (App Router), Redux Toolkit, RTK Query, TanStack Query, Tailwind CSS, Material UI, shadcn/ui

Backend

Node.js, Express, REST & GraphQL APIs, Socket.io, queue & cron pipelines (QStash, Cloud Tasks), JWT, OAuth 2.0, RBAC

AI / LLM

OpenAI & Gemini APIs, RAG (vector search, embeddings, reranking), structured outputs, SSE streaming

Databases

MongoDB (Mongoose), PostgreSQL, MySQL (Prisma), Firestore

Integrations & Payments

Stripe, PayPal, SSLCommerz, bKash/Nagad, Shopify & WordPress APIs, SMS gateways, ZKTeco biometrics

Cloud, Ops & Testing

Vercel, DigitalOcean (VPS, PM2), Firebase/GCP Functions, GitHub Actions CI, Sentry, Vitest, Jest, React Testing Library

About

Salman Sadik Siddiquee

I'm Salman, a full-stack engineer in Dhaka. My degree is in Geography and Environmental Science; everything I know about software I learned by shipping it.

Since 2023 I've been the top contributor on an AI content platform used by 100k+ people, led development of a device-lifecycle platform for a German medical-device manufacturer, and built a school management system that I still operate solo for 1,000+ students.

I like products where the code meets the real world (payments, biometric devices, SMS gateways, printed report cards) and AI features that hold up in production, not just in a demo.

Education: Bachelor of Science (BSc), Geography and Environmental Science · Begum Rokeya University, Rangpur, 2022
Languages: Bangla (native) · English (professional)

Contact

Open to remote roles

Building an AI product that needs to survive real users?

I'm open to international remote roles, full-stack or frontend, especially AI products. Based in Dhaka (UTC+6), comfortable overlapping with EU and US teams.

salman.dnj@gmail.com Resume

GitHub: github.com/salsadsid
LinkedIn: linkedin.com/in/salsadsid
Email: salman.dnj@gmail.com
Location: Dhaka, Bangladesh (UTC+6)