DEV Community: Mohammad Sijan

I Was Building a Social App. Then I Accidentally Built an AI Startup.

Mohammad Sijan — Fri, 10 Jul 2026 18:48:11 +0000

A year and a half ago, I wasn't trying to build an AI company.

I was building a small social platform called spritex-social — nothing fancy, just a side project a handful of friends were testing with me. No grand plan, no investors, no roadmap beyond "let's see if people like this."

At some point, users started asking the same basic questions over and over: how do I change my profile, where's this setting, how does that feature work. Instead of writing endless documentation, I thought — why not just let AI answer this?

So I wired up Google's Gemini API through Google AI Studio, built a small Retrieval-Augmented Generation (RAG) system, and gave it context about the platform. It was supposed to be a support chatbot. Nothing more.

That's not how it went.

I found myself spending more time improving the chatbot than improving the actual social app. Every small upgrade made me ask another question: could it remember conversations? Could it use tools? Could it search the web? Could it do things instead of just answering questions?

The more I asked, the less interested I became in the social platform I was supposed to be building.

Eventually I had to admit it to myself: I wasn't building spritex-social anymore. I was building something else entirely.

So I stopped. Not because the project failed — because my attention had already moved somewhere else, and I finally stopped pretending otherwise.

That "somewhere else" became RexiO — a Bangla-first AI platform I've been building solo ever since: my own orchestration layer, an intent classifier, 30+ tools, model routing across providers, and eventually our own fine-tuned models trained from scratch on borrowed Colab GPUs.

RexiO went public on July 10, 2026.

This chatbot pivot is just one chapter of a much longer story — one that actually starts on a Nokia button phone, ২ টাকা data packs, and a ৳20 freelance job that became my first line of code in production.

I wrote the whole thing down, unfiltered — the rewrites, the 12-hour bugs, the solo-founder nights, the relationship that quietly redirected the entire direction of my life, and why I think "AI built for Bangladesh" needs to mean more than just Bangla text output.

Full story: https://blogs.rexio.pro/posts/from-a-nokia-phone-to-rexio

Try RexiO: https://rexio.pro
SpritEX AI: https://spritexai.pro.bd

Would genuinely love to hear from other solo builders here — especially anyone who's pivoted a project mid-build because you accidentally found the real idea hiding inside it.

RexiO Is Now Open For Everyone — No Application, No Waitlist

Mohammad Sijan — Thu, 09 Jul 2026 07:37:53 +0000

Back in June, we announced that the Closed Test would be limited to just 500 seats, selected through a manual application process. That has changed.

RexiO is now open to everyone. No application form, no waitlist, no selection process. You can create an account right now and get the full RexiO experience immediately.

Use it on the web right now — no download required

The easiest way to get started: head to rexio.pro, create an account, and start using RexiO directly from your browser — just like Claude or ChatGPT. No install, no setup required.

Android app — available after 12 AM on July 10th

For those who want RexiO as a dedicated app on their phone, the Android app is on its way. Save this link now: rexio.pro/download — it goes live for direct download starting 12 AM on July 10th.

New accounts get a paid plan, free

When you create a new account, you'll automatically be given a paid plan (Plus or Pro) at no cost. We want everyone to experience RexiO's full capabilities — deep tool routing, faster responses, priority access — from day one, with no restrictions.

Support our Product Hunt launch

RexiO is now live on Product Hunt as well. If you try RexiO and like it, an upvote or comment would mean a lot to us — this is our first major push for public visibility, and your support helps us reach more people.

What stays the same

In-app feedback and bug reporting works exactly as before
We'll continue engaging directly in the community space
The top-contributor reward program is still coming — details will be announced soon

Thank you for your patience and early support. Now it's your turn — head to rexio.pro and get started.

Originally published on the RexiO Blog.

SpritEX — Bangladesh's First Cognitive AI Infrastructure Lab Is Building Something Big

Mohammad Sijan — Tue, 02 Jun 2026 16:48:34 +0000

Something quietly significant is happening in Bangladesh's tech landscape.

SpritEX — a Bangladeshi AI research company — has been engineering cognitive infrastructure and deep research systems from the ground up, with a singular mission: build world-class AI that speaks to Bangladesh.

Not an API wrapper. Not a chatbot template. A full-stack AI research lab, built locally.

The Company Behind It

SpritEX is not a startup in the traditional sense. It's a cognitive AI infrastructure company — the kind that builds the foundation layer that products run on top of. Think of it the way Anthropic is to Claude, or DeepMind is to Gemini.

The research focus spans:

Cognitive routing and multi-agent orchestration
Real-time intent classification at zero API cost
Bangla and Banglish language understanding
AI safety and alignment parameters for local context
Autonomous memory and persona synthesis systems

All of this infrastructure is being built in-house, from scratch, in Bangladesh.

The First Product: RexiO

The first major product coming out of SpritEX is RexiO — a premium AI assistant platform built specifically for Bangladeshi users.

RexiO isn't just another ChatGPT wrapper. It's the first real demonstration of what SpritEX's infrastructure can do when pointed at a real consumer product. Features include:

🧠 Auto-learning memory that builds a model of who you are across sessions
🔍 Real-time web search with live data integration
🌤️ Weather, market prices, and local search tools
📄 Document and image understanding
💻 Coding
💳 Native Bangladeshi payment support (bKash, Nagad, Rocket)
📱 Native Android app and full PWA support
🗣️ Banglish and Bengali language understanding built-in

RexiO will be launched on July 10, 2025.

This is the first AI assistant built by a Bangladeshi company, running on Bangladeshi infrastructure, for Bangladeshi people.

Why This Matters for Bangladesh

Right now, Bangladeshi users rely entirely on foreign AI products — ChatGPT, Gemini, Claude, Perplexity. These products don't understand local context, local language patterns, local payment systems, or local knowledge.

SpritEX is changing that.

The goal isn't just to build a product. It's to prove that world-class AI infrastructure can be engineered from Bangladesh — and eventually, to open that infrastructure to other Bangladeshi developers and companies through an API layer.

What's Coming After RexiO

SpritEX's public roadmap includes:

SpritEX API — opening the cognitive infrastructure to third-party developers in Bangladesh
RexiO Enterprise — custom AI deployments for Bangladeshi businesses
Research Publications — sharing findings on Bangla NLP, routing algorithms, and alignment

The lab is early. But the foundation is being laid carefully.

Follow the Journey

SpritEX Research Lab → spritexai.pro.bd
RexiO AI → rexio.pro
RexiO Github Community → github.com

Bangladesh's AI moment is coming. SpritEX is building the infrastructure for it.

Built in Bangladesh 🇧🇩

I Built an AI Assistant for Bangladesh — Introducing RexiO

Mohammad Sijan — Sun, 31 May 2026 11:19:57 +0000

Most AI assistants are built for English speakers. I wanted to change that.

RexiO is a premium AI assistant built specifically for Gen Z users in Bangladesh. It understands Bengali and Banglish naturally, searches the web in real-time, and builds a personal knowledge panel for every user — all in a fast, modern interface.

What RexiO Can Do

Real-time Web Search — RexiO searches the web live and summarizes results directly in the chat
Personal Knowledge Panel — RexiO builds a persistent knowledge base for each user, learning preferences and context over time to deliver increasingly personalized responses
Voice Chat — Full real-time voice interaction
Live Weather — Ask about weather anywhere and get instant results
Image Search — Ask for images and RexiO finds and displays them inline
Cross-platform — Available on Android (native app) and as a PWA for desktop and iOS
Scheduled Tasks (Coming Soon) — Automate recurring tasks and set scheduled prompts directly inside the chat

The Challenge

Building an AI assistant for Bangladeshi users is not just a translation problem. Users naturally mix Bengali and English in the same sentence — called Banglish. The system has to understand intent, not just language. That required building a custom multi-tier intent classification pipeline from scratch.

On top of that, the backend had to handle real-time streaming responses, live web search, personalized memory, and voice — all simultaneously, reliably, on production-grade infrastructure.

Architecture Decisions

The backend is built as a microservice architecture with three isolated services — each chosen for what it does best.

The public gateway prioritizes zero-latency streaming with no buffering on SSE connections. The core engine handles all stateful business logic, real-time sessions, authentication, and payments. The AI layer runs as a completely isolated service for agent workflows, web scraping, intent classification, and multi-agent coordination.

This separation means each layer can be scaled, updated, or replaced independently without touching the others.

The personal knowledge panel runs as an asynchronous background system — it learns from every conversation without adding any latency to the main chat response.

What's Next

RexiO is currently in development and launching soon. The goal is simple — make cutting-edge AI feel native for millions of Bangla-speaking users who deserve better than a translated chatbot.

Check it out at rexio.pro

Built by SpritEX — a Bangladesh-based AI company.