How I Built a Tech Interview Prep App with 35,000+ Questions in Flutter 🚀

Savankumar Sanghani — Sat, 05 Sep 2026 13:04:06 +0000

Hello DEV community! 👋

I recently launched TechQuiz, a mobile app designed to help software engineers, computer science students, and tech enthusiasts practice for coding interviews and technical aptitude tests.

You can check it out here: https://play.google.com/store/apps/details?id=com.ss333.Techquiz

I wanted to share a bit about my journey building this in Flutter and how I scaled it to support a massive library of content!

The Tech Stack:

Frontend: Flutter (GetX for ultra-fast, reactive state management)
Backend: Firebase Firestore (for seamlessly serving data)
Monetization: AdMob integration
Building for Scale: One of the most exciting parts of building TechQuiz was creating an architecture that could handle a massive amount of data. The app currently supports over 50+ programming languages and technologies, including Python, Java, Flutter, and Data Structures & Algorithms.

To make it truly useful for job seekers, I built a library of over 35,000 curated coding & logic MCQs. Using GetX allowed me to keep the UI incredibly smooth and responsive, even when users are rapidly firing through timed practice exams.

The Results: The response so far has been overwhelmingly positive! Thanks to a clean UI and a focus on real interview questions, we recently crossed 600+ organic installs and are maintaining a fantastic 33% conversion rate on the Play Store!

If you are currently preparing for a tech interview, or just want to challenge yourself and test your programming logic on the go, give TechQuiz a try!

I'd love to hear your thoughts in the comments below, and I'm happy to answer any questions about the Flutter/GetX architecture!

DEV Community: Savankumar Sanghani

How I Built a Tech Interview Prep App with 35,000+ Questions in Flutter 🚀