Currently at NeXbit LTD

Dhaka, Bangladesh

I build fast, secure, and beautifully crafted interfaces with Next.js and TypeScript — from the database to the last pixel.

2+
years building
15+
products shipped
10
phases on Currents alone

I'm a full-stack developer who builds fast, secure, and genuinely nice-looking products — from the database up to the last pixel.

My work lives in Next.js and TypeScript, backed by MongoDB and Node. I care about the details most people skip: hydration, rate limiting, focus states, and the way a page feels the moment it loads.

Lately I've been building indie products for the Bangladeshi market and sharpening the edges on security and UX.

Quick facts

sabbir.spec
Based in
Dhaka, Bangladesh
Timezone
GMT+6 · Asia/Dhaka
Languages
Bengali (native) · English (fluent)
Started coding
2022
Focus
Next.js · TypeScript · Security
Currently
Full-time at NeXbit LTD

Right now

  • BuildingSeylo — end-to-end encrypted chat with on-device AI
  • LearningPostgreSQL + Prisma, and Go for system tools
  • ExploringOn-device AI in the browser (Gemini Nano)
  • ReadingOther people's postmortems, mostly

How I work.

01

Security isn't a phase

Rate limiting, CSRF, session invalidation, audit logs. I build it in from the first commit, not after the first incident.

02

The details nobody lists

Hydration flashes, focus rings, empty states, the feel of a page at 200ms. Nobody writes these in a spec, and everybody notices them.

03

Own it end to end

Schema, API, UI, deploy, monitoring. Shipping the whole thing means never handing off the hard part.

04

Ship, then sharpen

Currents went through ten build phases. Version one exists to teach you what version two should be.

Next.jsTypeScriptReactMongoDBTailwind CSSNode.jsSocket.IOFramer MotionFastAPIChrome MV3Mapbox GLVercelCloudflareGoNext.jsTypeScriptReactMongoDBTailwind CSSNode.jsSocket.IOFramer MotionFastAPIChrome MV3Mapbox GLVercelCloudflareGo

A mix of production SaaS, on-device AI experiments, and internal tools — each shipped end-to-end. Open any one for the full case study: the problem, the approach, and what shipped.

seylo.realsabbir.dev
Seylo — interface preview
Private Messaging · On-device AI

Seylo

01

A private-by-design chat app: end-to-end encrypted, with messages that delete themselves and AI that runs on your device instead of a server.

Next.jsTypeScriptSocket.IO+3
Live site Live
currents.pixelwallbd.com
Currents — interface preview
SaaS · FinTech

Currents

02

A multi-currency personal finance tracker with production-grade security hardening across ten build phases.

Next.js 15MongoDBNextAuth+4
Live site Live
youtube.com/watch
Chrome Extension · On-device AI

Read or Skip

03

A Chrome MV3 extension that turns any YouTube video into a 10-second WATCH / SKIM / SKIP verdict — at zero infra cost.

Chrome MV3Gemini NanoStreaming+1
idphoto.pixelwallbd.com
ID Photo — interface preview
Web App · AI

ID Photo

04

An AI-powered ID photo studio with 30+ international document presets and one-tap background removal.

ReactFastAPIremove.bg+1
Live site Live
ramadhanbazaar.vercel.app
Ramadan Bazar Dor — interface preview
Civic · Maps

Ramadan Bazar Dorরমজান বাজার দর

05

A Bengali market-price mapping app that crowdsources daily grocery rates onto an interactive map.

Next.jsMapbox GLBengali UX+1
Live site Live
domain-guard.internal
Internal Tool · Security

Domain Guard

06

A domain-allowlist enforcement system for a 40-person team, spanning browser, server, and desktop.

Chrome ExtExpressMongoDB+2

27 technologies, grouped by the layer they live in — with an honest read on how deep I actually go in each. No percentage bars; just what I use daily, what I'm confident in, and what I'm still sharpening.

Daily driver
Strong
Working knowledge

Frontend

where the product meets the person07

Next.js

2y

App Router, server components, the whole surface

React

2y

Hooks, suspense, and knowing when not to re-render

TypeScript

2y

Strict mode on, `any` treated as a bug

Tailwind CSS

2y

Token-driven design systems, not utility soup

Framer Motion

2y

Motion that respects prefers-reduced-motion

Radix / shadcn

1y

Accessible primitives, restyled to taste

Three.js

1y

The 3D core in this hero, for one

Backend

the part users never see but always feel08

Node.js

2y

Runtime for nearly everything I ship

Express

2y

REST APIs, middleware, auth pipelines

MongoDB

2y

Aggregation pipelines and indexes that earn their keep

Mongoose

2y

Schema discipline on a schemaless database

NextAuth

2y

Sessions, providers, and real invalidation

Socket.IO

1y

Real-time transport behind Seylo

FastAPI

1y

When Python is the right tool — ID Photo's backend

PostgreSQL

<1y

Currently going deeper, with Prisma alongside

Platform & Infra

shipping it safely, keeping it up07

Vercel

2y

Default deploy target, edge config and all

Cloudflare

1y

DNS, Turnstile, and sitting in front of origins

Upstash

1y

Serverless Redis for rate limiting at the edge

Sentry

1y

Because production always finds a new way

Resend

1y

Transactional email that lands in the inbox

Git / GitHub

2y

Branches, Actions, and readable commit history

Docker

<1y

Reproducible local environments

Edges

the specialties that set the work apart05

Chrome Extensions

2y

Manifest V3, service workers, content scripts

On-device AI

1y

Gemini Nano in the browser — zero infra cost

Security hardening

1y

CSRF, CSP, 2FA, rate limits, audit logging

Mapbox GL

1y

Interactive maps tuned for slow mobile networks

Go

<1y

Windows services and local DNS in Domain Guard

Daily drivers

the tools around the code
  • VS CodeEditor
  • GitHub CopilotPair
  • ClaudeRubber duck that talks back
  • FigmaDesign
  • PostmanAPI testing
  • NotionSpecs & notes
  • Chrome DevToolsDebug
  • pnpmPackage manager
  • ESLintGuardrails
  • PrettierFormatting

Currently sharpening

  • PostgreSQL
    Relational modelling after years of documents
  • Prisma
    Type-safe queries end to end
  • Go
    System tools and services that outlive the browser
  • Docker
    Environments that behave the same everywhere

Product teams where I owned features end to end — schema, API, interface, and the deploy that put them in front of people.

  1. NeXbit LTD

    OngoingCurrent

    Full-Stack Developer

    Building internal tools, analytics dashboards, and SaaS features in Next.js and TypeScript — attendance, payroll with bulk payslips, and sales reporting with a consistent premium design system.

    • Attendance and payroll systems, including bulk payslip generation
    • Sales reporting dashboards with real analytics, not decorative charts
    • A shared design system that keeps every internal tool visually consistent
    • Next.js
    • TypeScript
    • MongoDB
    • Tailwind
  2. Bitsec

    Earlier

    Full-Stack Developer

    Built modern web applications with Next.js and TypeScript — portfolio sites for educational institutes, internal company platforms, and full-stack solutions with responsive UIs, secure APIs, and optimized performance.

    • Portfolio and web platforms for educational institutes
    • Internal company platforms with secure API layers
    • Performance work on responsive, content-heavy pages
    • Next.js
    • TypeScript
    • Node.js
    • MongoDB

2023 — 2024

Uttara Govt. College

Higher Secondary Certificate (Humanities)

Completed higher secondary education in the Humanities group while independently mastering modern web development through self-learning and the Programming Hero bootcamp.

2021 — 2022

Hogla Betka Secondary School

Secondary School Certificate (SSC)

Completed secondary education while developing a strong interest in technology, problem-solving, and web development.

Four small toys, built with the same care as everything above. Go on — nobody's watching.

move to paint · tap to burst

Say hello.

I'm full-time at NeXbit LTD and not taking on outside work. But if you want to talk shop, ask how something here was built, or just introduce yourself — this reaches me.

Not taking freelance, contract, or new roles right now.Usually replies within a day