# Hasan Sarwer

> Product builder and open-source creator with a PhD in Mathematics. Shipping developer tools, B2B SaaS products, and building the foundation for the ultimate adaptive e-learning platform.

## About

- Name: Md. Hasan Sarwer
- Title: Product Builder & Open-Source Creator
- Location: Dhaka, Bangladesh
- Email: hasanmathju@gmail.com
- Website: https://hasansarwer.com
- Products: https://esalt.net

## Products

- salt-theme-gen: OKLCH-based design system theme engine. One hex color in — complete light/dark theme with 21 semantic colors, 32 interactive states, and WCAG accessibility. Zero dependencies, pure TypeScript. npm: https://www.npmjs.com/package/salt-theme-gen GitHub: https://github.com/Hasansarwer/salt-theme-gen
- react-native-salt: 119-component React Native UI library with single-color theming. Pass one hex color — every component adapts in light and dark mode. No native linking, works in Expo Go. npm: https://www.npmjs.com/package/@esaltws/react-native-salt GitHub: https://github.com/Hasansarwer/react-native-salt
- DentistLeads: B2B SaaS data pipeline that identifies under-performing dental practices in any target city and generates AI-powered opportunity reports for dental marketing agencies. Built with FastAPI, PostgreSQL, Anthropic SDK, Google Maps API, H3 hex grid. In active development.
- E-Learning Platform: Adaptive, interactive e-learning platform with mathematical rigor and serious pedagogy. In development.

## Skills

- Design / Interaction: salt-theme-gen, OKLCH Color Science, Design System Architecture, Interactive Simulations, 2D/3D Graphics Programming
- AI & Data Engineering: Anthropic SDK, Claude API, Python, Pandas, NumPy, SciPy, Scikit-learn, Matplotlib, Seaborn, Plotly, Dash, BeautifulSoup
- Research / Quantitative: Numerical Analysis, Computational Mathematics, Algorithm Design, Mathematical Modeling, MATLAB, Mathematica, Maple, Fortran, C/C++, LaTeX
- Frontend: React, Next.js, Redux, React Router, TypeScript, Pixi.js, Three.js, HTML Canvas
- Mobile: React Native, Expo
- Backend: Node.js, Express.js, WebSocket, FastAPI, Authentication & RBAC
- Databases: MongoDB, Mongoose, MySQL, PostgreSQL, SQLModel, Alembic
- Cloud/DevOps: Git, GitHub, AWS (EC2, RDS, Route 53, Amplify, IAM), Vercel, Linux, npm Publishing

## Education

- PhD in Mathematics, South Asian University, New Delhi (2013-2019). Thesis: "High Accuracy Compact Numerical Methods for Nonlinear Biharmonic Problems of First Kind"
- MSc in Mathematics, Jahangirnagar University, Dhaka (2009-2010)
- BSc (Hons) in Mathematics, Jahangirnagar University, Dhaka (2005-2009)
- SAARC-India Silver Jubilee Scholarship recipient

## Experience

- Independent Software Engineer, Self-Employed, Dhaka (Mar 2025 - Present): Building open-source libraries (salt-theme-gen, react-native-salt) on npm. Building DentistLeads — B2B SaaS lead pipeline for dental marketing agencies. Contract backend work for WorkingFromHammock.
- Pedagogy Specialist & Lead Software Engineer, Automind IT, Dhaka (Dec 2023 - Feb 2025): Led development of 1,000+ interactive simulations for Sheikh Russel Digital Lab (Ministry of ICT, Bangladesh). Managed team of 23.
- Backend Developer & Data Engineer, WorkingFromHammock, Netherlands (Mar 2023 - Present): Backend APIs, Python scraping pipelines, geo-distance systems for a travel platform.
- Full-Stack Developer, Pallabi Business Service, Dhaka (Feb 2023 - Mar 2023): Built ecommerce ecosystem with 1 web platform + 4 mobile apps.
- Lecturer in Mathematics, College of Aviation Technology (Jan 2022 - Dec 2023): Taught Mathematics I-V to undergraduate students.
- Freelance Developer, Various Clients (2019 - 2022): MATLAB programming, data analysis, web development.
- Research Scholar, South Asian University, New Delhi (Jul 2013 - Apr 2019): Doctoral research, 2 peer-reviewed publications, taught Numerical Analysis and CFD.

## Notable Projects

- salt-theme-gen: OKLCH design system theme engine. Published on npm. GitHub: https://github.com/Hasansarwer/salt-theme-gen
- react-native-salt: 119-component React Native UI library. Published on npm. GitHub: https://github.com/Hasansarwer/react-native-salt
- DentistLeads: B2B SaaS pipeline — identifies under-performing dental practices, generates AI opportunity reports for marketing agencies.
- Sheikh Russel Digital Lab: 1,000+ interactive educational modules for grades 6-10, funded by Bangladesh Ministry of ICT.
- WorkingFromHammock: Backend and data pipeline for a travel platform for remote workers. Live: https://workingfromhammock.com
- Pallabi Business Service Ecosystem: 1 web + 4 mobile apps for B2B/B2C ecommerce.
- SymptomWatch: AI-assisted mental health monitoring platform with risk scoring. Live: https://symptomwatch-puce.vercel.app

## Publications

- Mohanty, R.K. & Sarwer, M.H. (2019). "A class of numerical methods for the solution of fourth-order nonlinear ordinary differential equations on a graded mesh." International Journal for Computational Methods in Engineering Science and Mechanics, 20:5, 434-450.
- Mohanty, R.K., Sarwer, M.H. & Setia, N. (2016). "A class of quasi-variable mesh methods based on off-step discretization for the solution of non-linear fourth order ordinary differential equations." Advances in Differential Equations, 2016:248.

## Certifications

- IBM Full-Stack JavaScript Developer (Coursera, 2025)
- IBM Backend JavaScript Developer (Coursera, 2025)
- IBM AI Developer (Coursera, 2025)
- IBM Data Science (Coursera, 2024)
- IBM Front-End Developer (Coursera, 2025)
- Meta React Native (Coursera, 2024)
- Meta Front-End Developer (Coursera, 2025)
- Online Learning Design for Educators, Macquarie University (Coursera, 2025)

## Links

- GitHub: https://github.com/Hasansarwer
- LinkedIn: https://www.linkedin.com/in/hasansarwer/
- Google Scholar: https://scholar.google.com/citations?user=IgjT4gUAAAAJ&hl=en
- ORCID: https://orcid.org/0000-0002-8402-5146
- npm: https://www.npmjs.com/~hasansarwer
- DEV: https://dev.to/hasansarwer

## Site Pages

- Home: https://hasansarwer.com/
- About: https://hasansarwer.com/about/
- Projects: https://hasansarwer.com/projects/
- Skills: https://hasansarwer.com/skills/
- Experience: https://hasansarwer.com/experience/
- Research: https://hasansarwer.com/research/
- Contact: https://hasansarwer.com/contact/
- SAU Sample Questions: https://hasansarwer.com/sau-sample-questions/

## Project Pages

- salt-theme-gen: https://hasansarwer.com/projects/salt-theme-gen/
- react-native-salt: https://hasansarwer.com/projects/react-native-salt/
- DentistLeads: https://hasansarwer.com/projects/dentistleads/
- Sheikh Russel Digital Lab: https://hasansarwer.com/projects/sheikh-russel-digital-lab/
- WorkingFromHammock: https://hasansarwer.com/projects/workingfromhammock/
- SymptomWatch: https://hasansarwer.com/projects/symptomwatch/
- Pallabi Business Service Ecosystem: https://hasansarwer.com/projects/pallabi-ecosystem/
- Data Analysis & Visualization: https://hasansarwer.com/projects/data-analysis-dashboards/