Available for new projects

Sabbir Hassan Developer · Designer · Mentor

Crafting high-performance software and pixel-perfect interfaces. From Rust backends to Flutter apps — I build things that are fast, beautiful, and purposeful.

View My Work Get In Touch Resume
3+
Years Experience
20+
Projects Shipped
5
Languages
∞
Curiosity
Scroll
Sabbir Hassan
Available for work
About Me

Building at the intersection of
code & design

I'm a fullstack developer and designer who thrives where complex engineering meets elegant UI. I write systems-level code in Rust for performance-critical backends and build beautiful cross-platform apps with Flutter.

My competitive programming background in C++ sharpens algorithmic thinking, while my design work in Figma and the Adobe suite keeps every interface sharp and intentional.

I believe great software is invisible — it gets out of the user's way and just works.

Backend & Systems

Rust, C++ — high-performance, memory-safe code

Mobile Dev

Flutter & Dart — beautiful cross-platform apps

Web Frontend

Custom JS — no bloat, full control

UI/UX Design

Figma, Adobe XD, Illustrator, Photoshop

Journey

Experience & Education

The path that shaped my craft.

Work

2023 — Present Full-time

Fullstack Developer

Freelance / Self-employed

Building web apps, mobile apps and backend systems for clients across multiple industries. Rust, Flutter, custom JS.

2022 — 2023 Contract

UI/UX Designer

Various Clients

Designed interfaces for SaaS products and mobile apps using Figma and Adobe XD. Focused on design systems and component libraries.

2021 — 2022 Part-time

Technical Writer & Mentor

Open Source Community

Wrote developer documentation with MkDocs and mentored junior developers in competitive programming and system design.

Education

2020 — 2024 Degree

B.Sc. in Computer Science

University

Focused on algorithms, data structures, and systems programming. Active in competitive programming clubs and hackathons.

2022 Certification

Rust Systems Programming

Self-directed / Online

Deep dive into Rust — ownership, async runtimes, zero-cost abstractions, and building production-grade CLI and web services.

2021 Certification

Flutter & Dart Development

Google / Udemy

Mastered cross-platform mobile development, state management patterns, and publishing to both App Store and Google Play.

Services

What I can build for you

End-to-end delivery across mobile, desktop, web, design, and backend — whatever your product needs.

Mobile Apps

Cross-platform iOS & Android apps with native performance. Smooth animations, offline-first architecture, and pixel-perfect UI from a single codebase.

Flutter Dart iOS & Android Riverpod Firebase

Desktop Software

High-performance desktop applications built with Rust — system utilities, CLI tools, and GUI apps that are fast, memory-safe, and built to last.

Rust C++ CLI Tools Cross-platform

UI/UX Design

Full design process from wireframes to polished prototypes. Figma-based design systems, component libraries, and handoff-ready specs that developers can actually use.

Figma Adobe XD Prototyping Design Systems

Technical Docs

Clear, structured documentation for APIs, SDKs, and internal tooling. MkDocs sites, developer guides, and README-to-full-portal setups that teams actually read.

MkDocs API Docs SDK Guides Markdown

API & Backend

Production-grade REST and WebSocket APIs built in Rust. Designed for throughput and reliability — with clean architecture, proper error handling, and database integration.

Rust REST WebSockets Actix / Axum Databases

Logo & Banner Design

Brand marks and visual assets that make an impression — from wordmarks and icon logos to YouTube banners, social media headers, and print-ready campaign graphics.

Illustrator Photoshop Figma Brand Identity Social Media Print
Tech Stack

Tools of the trade

Languages, frameworks, and tools I use to bring ideas to life — from systems code to polished UI.

Backend & Systems
Performance-critical engineering
Rust C++ Actix-Web Tokio Axum REST APIs WebSockets Algorithms & STL
Mobile Development
Cross-platform native experience
Flutter Dart Riverpod BLoC GetX Hive / SQLite Firebase Animations
Web & Frontend
Custom components, no framework bloat
JavaScript HTML5 CSS3 Custom Components Animations API Intersection Observer Web APIs
Design & Creative
From wireframe to final asset
Figma Adobe XD Illustrator Photoshop Premiere Pro UI/UX Design Logo Design Motion Graphics
Competitive Programming
Algorithms, data structures & problem solving
C++ STL Dynamic Programming Graph Theory Segment Trees Binary Search Codeforces LeetCode AtCoder
Database Management
Relational, document & in-memory stores
MongoDB MySQL SQLite ScyllaDB Redis Schema Design Query Optimisation Indexing
Featured Work

Projects I'm proud of

A selection of work spanning systems programming, mobile apps, and the web.

Hyper — Async Task Queue

A blazing-fast distributed task queue in Rust using Tokio. Features persistent RocksDB storage, priority scheduling, and a clean HTTP API — built to handle 100k+ jobs/sec.

RustTokioRocksDBActix-Web
GitHub Live

Finora — Personal Finance App

Cross-platform personal finance tracker in Flutter. Real-time spending analytics, custom chart widgets, biometric auth, and local-first Hive storage — iOS & Android.

FlutterDartHiveRiverpod
GitHub Case Study

Pixel — JS Component Library

A handcrafted vanilla JS component library with zero dependencies. 30+ accessible, animated components — dark/light mode, keyboard navigable, WCAG AA compliant.

JavaScriptCSSWeb ComponentsWCAG AA
GitHub Docs
Documentation

Written guides & references

Technical documentation I maintain with MkDocs — covering languages, tooling, and system design patterns.

2.4k

Rust Systems Programming Guide

A comprehensive reference covering ownership, borrowing, and lifetimes from first principles. Includes async runtimes with Tokio, error handling patterns, and building production-grade HTTP services with Actix-Web.

RustAsyncSystems
Read
1.8k

Flutter Architecture Patterns

Deep-dive into scalable Flutter app architecture. Covers Riverpod state management, feature-first folder structure, dependency injection, and building reusable widget systems with proper separation of concerns.

FlutterDartArchitecture
Read
3.1k

Vanilla JS — Beyond the Basics

An opinionated guide to writing maintainable JavaScript without frameworks. Event delegation, custom element patterns, the Intersection Observer API, Web Workers, and performance profiling in the browser.

JavaScriptWeb APIsPerformance
Read
987

C++ Competitive Programming Notes

Curated notes from years of competitive programming. Covers segment trees, graph algorithms, dynamic programming optimisations, and STL internals with annotated solutions to classic problems.

C++AlgorithmsDSA
Read
1.2k

UI Design Systems from Scratch

A practical walkthrough of building a design system in Figma and translating it to CSS custom properties. Covers token naming conventions, component variants, dark mode strategy, and handoff workflows.

FigmaCSSDesign Tokens
Read
756

Database Internals & Query Design

Internals of MySQL, MongoDB, ScyllaDB, and SQLite explained side by side. Covers indexing strategies, query planning, schema design trade-offs, and when to reach for each engine in a production stack.

MySQLMongoDBScyllaDB
Read
YouTube

Watch & learn

I post coding tutorials, dev-log series, and UI/UX breakdowns. Subscribe to follow along.

S
Sabbir Hassan
@sabbir_dev
4.2k
Subscribers
38
Videos
120k
Total Views
2021
Since

Tutorials on Rust, Flutter, and vanilla JS. Deep-dives into system design, UI/UX teardowns, and the occasional competitive programming walkthrough.

Subscribe
Rust Tutorial
18:42
Building a REST API in Rust with Actix-Web from scratch
8.4k 3 mo ago
Flutter
24:10
Flutter Riverpod — State management that actually makes sense
5.1k 5 mo ago
Vanilla JS
31:05
Custom JS components with zero dependencies — the right way
12.3k 1 mo ago
Freelance

Hire me on your platform

Available for freelance projects on both Fiverr and Upwork. From quick gigs to long-term contracts.

Active

Quick turnaround on focused deliverables — UI/UX design, Figma prototypes, Flutter app development, Rust microservices, and custom web components. Clear scope, fast delivery.

5.0
Rating
40+
Orders
100%
Completion
View Fiverr Profile
Active

Available for longer-term contracts and complex projects — full-stack systems, mobile apps end-to-end, design-to-code handoffs, and ongoing technical consulting. Milestone or hourly.

Top
Rated
25+
Jobs
98%
JSS
View Upwork Profile

Not sure which platform? Just use the contact form below — I'm happy to work directly too.

Send a Message
Contact

Let's build something
great together

Whether you need a performant backend, a polished mobile app, or a full product from design to deployment — I'm open to new opportunities and collaborations.

sbbir0087@gmail.com
Bangladesh
Usually replies within 24h