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Focusing
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@FlexpointLLC

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RizviBR0/README.md

Designing products. Engineering experiences. Visit Sabbir Rizvi’s portfolio.

Sabbir Hossain Rizvi

I’m a full-stack software engineer and UI/UX designer based in Dhaka, Bangladesh. I take web and mobile products from the first Figma prototype through to the interfaces, APIs, and databases they run on.

Portfolio · LinkedIn · Email me

Current work

Arohon · Co-founder and Head of Engineering
I lead engineering for a mobility and delivery service in Bangladesh. I build the booking and live tracking features that connect riders with drivers, and the web tools our team uses to verify drivers and manage trips.

Flexpoint · Co-founder
I design and build the storefront setup, checkout, and dashboards that creators use to sell digital products and services.

Selected projects

Project What you can do
Woff Space Share files, notes, and code in a room anyone can join with a link or room code. Woff Space case study
Loome Publish design work, browse other designers’ projects, and give feedback. Loome case study
IdeaVault Publish a startup idea and discuss it with other founders in a comment thread. IdeaVault case study

Skills & technologies

Product engineering and QA: API design, real-time systems, native Android, and regression testing AI engineering and automation: RAG, tool-calling agents, model tuning, and evaluation Cybersecurity: network analysis, web testing, and database access control

Frontend
React Next.js TypeScript JavaScript HTML5 CSS3 Tailwind CSS shadcn/ui

Mobile
React Native Expo Kotlin

Backend & databases
Node.js Express.js PostgreSQL MongoDB Supabase Firebase

Design & publishing
Figma Adobe XD Webflow Framer WordPress

Version control
Git GitHub

Product engineering, design & QA
  • Delivery · Software architecture, technical leadership, API design, authentication, third-party integrations.
  • Mobile & data · Native Kotlin modules, maps, routing, live location, real-time sync, concurrent note saves.
  • AI for design · User flows, layout exploration, wireframes, interactive prototypes, UI copy, image and video creation and editing.
  • Development & testing · Feature development and refactoring with Codex, debugging from logs, code review, regression tests, usability checks, exploratory, UI, and functional testing.
AI engineering & automation
  • Research · Reusable prompts, source verification, analysis of documents, spreadsheets, and customer feedback.
  • AI features · Model APIs for chat, summaries, and structured extraction. Document Q&A with embeddings and retrieval-augmented generation (RAG).
  • Agents · Repository instructions, reusable agent workflows, API and MCP tools, event-driven automation, human approvals.
  • Models · Local inference, PyTorch training and fine-tuning, evaluation of quality, failures, latency, and cost.
Cybersecurity
  • Network & web · Kali Linux labs, port and service discovery, traffic analysis, SQL injection and cross-site scripting (XSS) testing.
  • Access control · Private data handling, agent permissions, PostgreSQL row-level security.
More languages & tools
  • Languages & data · C, C++, Java, Python, MySQL, pandas, PyTorch
  • Web · Django, Redux, Bootstrap, Sass, webpack
  • Mobile & hardware · Flutter, Arduino
  • Design & tooling · Adobe Illustrator, Adobe Photoshop, Docker, Linux, Postman

GitHub activity

GitHub contributions over the last 12 weeks Primary languages of my public, non-fork repositories

A snake eating squares from my GitHub contribution calendar

Browse my repositories

Pinned Loading

  1. arthub-client arthub-client Public

    ArtHub - A full-stack online art marketplace connecting artists with collectors and buyers

    JavaScript

  2. Woff Woff Public

    TypeScript 1 1

  3. ideavault-client ideavault-client Public

    JavaScript

  4. suncart suncart Public

    JavaScript

  5. SkillSync SkillSync Public

    SkillSync is an intelligent learning navigator that creates personalized roadmaps to help individuals achieve their career and skill goals. It curates the best learning resources from across the we…

    CSS