Senior Lead Software Engineer at bKash
I build the payment systems millions of people in Bangladesh use every day — and research where deep learning meets software engineering.
Every day, millions of people across Bangladesh tap their phones to send money, pay bills, and run their businesses — and I help make that happen. I’m Tushar, a Senior Lead Software Engineer at bKash Limited, the country’s largest mobile financial service. I build the systems that keep digital payments fast, reliable, and secure at massive scale.
I grew up in Bangladesh, earned my B.Sc. in Computer Science and Engineering from Ahsanullah University of Science and Technology in 2015, and have been obsessed with building things that matter ever since. I care most about work that sits at the intersection of solid engineering and real-world impact — the kind where a well-placed optimization or a cleaner architecture quietly makes life easier for millions of people.
Building the mobile financial service millions of people in Bangladesh use every day. Earlier, as Assistant Lead Engineer, developed customer-app features in Flutter, pitched and vetted new feature ideas with other teams, took part in hiring, and initiated the team's Test Driven Development practice.
Graduate teaching associate at Arizona State University in Tempe, Arizona.
Cut the completion time of CPU-intensive image processing in an Android app by a wide margin using RenderScript. Built image and video editing tools — filters, crop, zoom, rotate, auto-resize, auto-repositioning — plus core features of an end-to-end encrypted messenger, working closely with the UI/UX team.
Designed and built a multi-tenant management website with Java Vaadin, plus Android apps for real-time location sharing and for tracking product sales.
Taught in the Departments of Computer Science and Engineering: Software Development using Java and C# at AUST (Feb 2017 — Jul 2018), and Programming Language (C), its lab, and Operating Systems at South East University (Jan — Dec 2017).
Built the first multi-track audio player for web browsers from scratch with the HTML5 Web Audio API — trimming, seeking, snap-to-grid and real-time collaboration — plus news-feed features for a social platform for musicians.
Developing features of the bKash mobile banking app for Android and iOS, used by millions of people every day.
An end-to-end encrypted Android messenger built on the Signal protocol, with in-app image and video editing tools and much faster image processing via RenderScript.
A social platform for musicians, with the first multi-track audio player for web browsers — trimming, seeking, snap-to-grid and real-time collaboration.
An Android app using Google Firebase ML Kit to detect barcodes and faces and extract additional information from images.
A corpus of 8,475 programming problems with solutions in both Java and Python, collected from competitive programming sites, online platforms and open-source repositories — with baselines for supervised program translation.
Summarizing and improving question answering over app privacy policies. Crawled 10,000+ Google Play privacy policies and their metadata.
Classifying user queries into intents and mapping them onto the Open Directory Project tree. Crawled 80,000+ web pages across 7,600 topics.
Notes on Git internals and workflows — references, merges, rebasing, rewriting history, tracking branches and GitFlow — gathered in one place.
Bitwise operators, truth tables, and a list of practical bit tricks gathered in one place.
Solving systems of linear congruences with the Chinese Remainder Theorem and the Extended Euclid algorithm, with a worked example.
An optimized O(√n) way to find the sum of divisors of the first n natural numbers.