available·Dhaka GMT+6 --:--:--·

package main
const (
role = "Software Engineer"
secret = "Security Researcher"
name = "Sabitur Rahman"
)
func (s Sabitur) Exploit() CTF {
return s.pwn()_
}

4
pub.dev packages
flutter
core contributor
CTF podiums

$ ls ./projects --featured

Featured work.

// Shipped products, published packages, and research — what it is and what it does.

Klasio — Learning Management SystemLive case_study_01.md

Klasio — Learning Management System

/* A modern LMS that makes online courses easy for everyone, everywhere. Cross-platform mobile app delivering course content, video, and assessments at scale. */

FlutterDartKotlinAndroidiOS
LMS
global e-learning
platforms (iOS + Android)
live
klasio.com
v./voice-recognition
OSS case_study_02.md

voice_recognition_flutter — pub.dev package

/* A Flutter package for continuous on-device voice / speech recognition. Built the native bridge and the Dart API; shipped a documented continuous-listen pattern. */

DartFlutterAndroidSpeech
pub.dev
published package
continuous
always-on listen
native
Android speech API
F./ffi-golang
2025 case_study_03.md

Flutter ↔ Go via FFI

/* Calling Go shared libraries from Dart through the C ABI — memory ownership, `import "C"`, `.dylib`/`.so` builds, and a working notification example end-to-end. */

Dart FFIGoC ABIFlutter
FFI
Dart → Go
C ABI
shared lib bridge
writeup
full tutorial

$ git log --pretty=fuller --graph

Work experience.

// Professional roles, dates, and what I shipped at each.

No experience entries yet.

    $ man ./services

    What I build.

    // Mobile + open-source services — scoped, shipped, and documented end-to-end.

    $ build:mobile--client

    Production mobile apps

    End-to-end iOS + Android builds — architecture, offline-first data, design system, store release.

    • iOS + Android
    • State architecture
    • Release pipeline

    $ consult:flutter--client

    Mobile performance & audit

    Codebase audit, jank/budget profiling, state-management refactor, and a prioritised fix plan.

    • Audit report
    • Perf budget
    • Refactor PRs

    $ build:package--client

    Reusable Dart packages

    Extract a platform-channel or feature module into a documented, tested pub.dev package.

    • Package
    • Example app
    • pub.dev release

    $ research:native--client

    Native interop research

    FFI / platform-channel spikes — Go, C, Kotlin, Swift — with reproducible demos and writeups.

    • Spike demo
    • Architecture note
    • Writeup

    $ cat ./writing/*.md

    Writing & tutorials.

    // Deep dives on Flutter internals, native interop, deep linking, and voice.

    $ git log --author=sabitur --contributions

    Open source contributions.

    // Framework PRs, SDK fixes, and authored packages on pub.dev.

    $ cat ./wins.log

    CTF wins & security.

    // Capture-the-flag podiums — cyber security research competitions.

    // no image
    ★ featured
    [ctf]

    Champion — MIST Leetcon 2023

    Capture-the-flag competition for cyber security researchers, organised by Military Institute of Science and Technology.

    Nov 2025
    // no image
    ★ featured
    [ctf]

    1st Runner-Up — IUT ICT FEST 2024

    CTF competition for security researchers, organised by Islamic University of Technology (IUT).

    May 2024
    // no image
    [ctf]

    1st Runner-Up — IEEE Bootcamp CTF

    CTF contest organised by the Islamic University IEEE Student Branch.

    Dec 2021

    $ echo $STACK | jq .

    Tech stack.

    mobile

    • · Flutter
    • · Dart
    • · Kotlin
    • · Swift
    • · Material 3

    platform

    • · FFI (C ABI)
    • · Platform channels
    • · Go
    • · AndroidManifest

    backend

    • · Supabase
    • · Firebase
    • · REST
    • · gRPC

    tools

    • · Git
    • · GitHub Actions
    • · pub.dev
    • · Figma
    • · Burp Suite

    $ ./connect --me

    Let's build something.

    ~/sabitur/contact.sh — Mirpur-1, Dhaka, Bangladesh