03Fintech — Mobile
•••• •••• •••• 2024
JustPay
JustPay
2022 — 24Senior Software Engineer
Mobile banking app for Jamuna Bank, built at Circle Fintech. Designed UI, built features, and integrated the banking APIs.
- React Native
- Redux
- GraphQL
Portfolio — 2026Full-Stack Engineer & WriterDhaka, Bangladesh
MuhammadMozzammel Haque
I build fast, dependable products for web and mobile, from the first screen to the server it runs on.
Currently Senior React Native Engineer at Arogga
- 7+
- Years shipping web & mobile products
- 30%
- Fewer crash and delay complaints at Arogga
- 25%
- Faster time-to-market across 3 app launches
Things I've built& shipped
Live on CodeCanyon
Five SaaS and website-builder products I built for KreativDev, now live on Envato's marketplace. All run on Laravel with multitenancy, subscription billing and a payment-gateway layer.
yourbrand.businesso.app
CorporateHotelCoursesCharity
Book appointment
- 01 · Introduction
- 02 · Setup
- 03 · Quiz
Stories worth
reading.
(03) About
I care about the parts users never see — load times, crash rates, and the code that keeps them low.
I'm a Full-Stack Engineer from Dhaka with 7+ years of experience across web and mobile. My core is React Native and React, backed by back-end work in Node.js, NestJS, and Laravel.
At Arogga I architected the front end of the Android and iOS app and helped a team of five launch three mobile apps in six months. Before that I led the frontend team at Circle Fintech and shipped JustPay for Jamuna Bank. Most recently I took NailCanvasBD from first commit to production on my own.
Outside of work I write on Medium, mostly benchmarks and deep dives on Node.js, databases, and Rust, published in Level Up Coding and ILLUMINATION.
Education
BSc in Computer Science & Engineering, United International University (2014 — 2019). Thesis on novel class detection in concept-drifting data streams, published on IEEE Xplore.
Experience
- 2026Full-Stack EngineerNailCanvasBD (Freelance)
- 2024 — NowSenior React Native EngineerArogga Limited
- 2022 — 2024Senior Software EngineerCircle Fintech Limited
- 2020 — 2022Software EngineerCircle Fintech Limited
- 2020 — 2023Full-Stack Developer (Part-time)KreativDev
- 2019 — 2020Software EngineerAdvanced Apps Bangladesh
- 2017 — 2018Software DeveloperNetexpro
Capabilities
- Mobile & Front End
- React Native, React, Next.js, TypeScript, Redux, GraphQL, Sass (BEM)
- Back End
- Node.js, NestJS, Laravel, Lumen, REST, gRPC, Kafka, Microservices
- Data & Infra
- MySQL, PostgreSQL, MongoDB, Docker, Nx, Nginx, Linux deployment
Notes from the workbench
I write on Medium about performance, databases, Rust, and the JavaScript ecosystem. Most pieces start with a benchmark I ran myself.
LatestLevel Up Coding
A lock protected my backend and still left 2,503 requests waiting
Read article
- On 2 cores, Python threads made CPU work 19% slower. The free-threaded build made it 1.6x fasterMedium
- One Bengali word was 14, 42 and 6 characters long, depending on the toolMedium
- SQLite in default mode starved my readers, and WAL mode had its own trapLevel Up Coding
- The float sum was fine. The per-line rounding was off by 51,888 cents.Medium
- People start new goals on Mondays and on the 1st.ILLUMINATION