I'm Shaikh Mahad Ud Din, a developer based in Karachi, Pakistan, focused on Java backend development.
I started programming with C++ in school. What kept me interested was the problem-solving: getting stuck, tracking down a mistake, and finally understanding why something works. That same curiosity eventually drew me toward what happens behind an application.
My focus is Java, Spring Boot, REST APIs, and relational databases. I like tracing a request through business logic, security checks, and database queries. I’m also interested in system design: where responsibilities belong and how components communicate. Before adopting a pattern, I want to understand the problem it solves and the trade-offs it introduces.
A little more about me
Most of my work so far has been in repositories I started myself. I’d like to contribute to open-source Java projects and learn how maintainers organize code, review changes, and decide what belongs.
I also enjoy the conversations that come with sharing work. If someone spots a simpler solution or asks why I made a particular choice, I want to understand their reasoning, explain mine, and improve the result.
More from my toolkit
Java and Spring Boot are my main backend tools, with PostgreSQL for relational data. I pay attention to how an endpoint handles invalid input, what its errors tell the caller, and the queries it runs to produce a response.
| Area | Technologies & concepts |
|---|---|
| Programming foundations | C++ · Kotlin · DSA · OOP |
| APIs & persistence | HTTP/REST · Spring Data JPA · Hibernate · MapStruct · OpenAPI |
| Data & migrations | SQL · MySQL · Flyway |
| Development workflow | Git · GitHub · Maven · Postman · IntelliJ IDEA |
Currently exploring: JUnit · Spring Security · Java internals · design patterns · SQL query performance.
Java · Bash · Ubuntu · systemd
A deployment and rollback tool for a Java service. It manages versioned releases, verifies application health after updates, and restores the previous working version when a deployment fails. I tested both successful updates and automatic recovery on an Ubuntu VM.
Deployment script · Rollback demo →
Earlier projects: Derivify & Quizzler
Kotlin · Jetpack Compose
A calculus toolkit built around a custom symbolic differentiation engine. It parses expressions, applies differentiation rules, and computes partial derivatives and gradients. I built it for a university calculus project, with practice quizzes alongside the calculator.
Math engine · Calculator screenshot →
Kotlin · Jetpack Compose
An Android quiz app for practising object-oriented programming. It uses MVVM to keep quiz state separate from the interface, with instant answer feedback and score tracking. Java/Kotlin, C++, and Python question sets share a common data-source interface.
Quiz state logic · Quiz screenshot →
I founded and manage The UBIT Hub, a WhatsApp community connecting 900+ UBIT students through course updates, academic discussions, shared resources, and peer support. I organize the groups, answer questions, and make important information easier for students to find. I also maintain The UBIT Hub Resources, a GitHub repository where I organize and share notes, guides, and course materials so they don't get lost in old chats. Alongside this, I built the UBIT Results Portal, where students can check results, calculate GPA, explore class rankings, and view transcripts.
I keep separate workspaces for Java language study, DSA practice in Java, SQL queries, and Linux and Bash coursework. I try to leave enough explanation alongside the code that, when I come back weeks or months later, I can remember what I tried and why.
I started learning touch typing in 2023, when I was around 60 WPM and still looking down at the keyboard. Getting past 130 WPM took plenty of practice, but what I appreciate most is not having to think about where the next key is. Whether I'm writing code, taking notes, or replying to someone, it's one less thing interrupting my focus. I still enjoy a quick typing test now and then. 
I’d be glad to hear your thoughts on something I’ve built, especially if you’d approach it differently. I’m also up for a conversation about what you’re building or an idea you’d like to try. I share articles when I have something longer to write about.
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