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Ajay Kumar

@ajaykumar62

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Android developer at Gumb.AG who led the Android 14 migration and built a full-stack restaurant ordering MVP.

India

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At Gumb.AG, I led Android development for Gumb, a calendar and scheduling app for teams, clubs, and associations. I migrated the app from Android 13 to Android 14, resolving SDK and build compatibility issues involving KSP and Hilt.

As an independent software engineer, I built Tapnix, a QR-based restaurant ordering platform with customer, kitchen, waiter, and admin workflows. I developed its React and TypeScript frontend and Django backend, with real-time order updates through WebSockets.

I also built Nexahomez, a Kotlin Android smart-home app integrated with ESP32 and ESP8266 devices. Earlier, at WayCool Foods and Products, I built and maintained Java Android apps, including the WayCool B2B online-ordering app.

Experience

Work history, roles, and key accomplishments

Current

Independent Software Engineer

Current

Self-Employed

Jan 2025 - Present (1 year 9 months)

Architected and built Tapnix, a QR-based restaurant ordering platform, and Nexahomez, a Kotlin Android smart-home app. Developed full-stack solutions with React, Django, and Kotlin, and provided Android support for Spotshunt.

Kotlin Jetpack Compose React TypeScript Redux toolkit Django DRF PostgreSQL Redis Django Channels WebSockets Firebase Cloud Messaging ESP32 ESP8266 MQTT Railway Render

Lead Android Developer

Gumb.AG

Jan 2024 - Dec 2024 (11 months)

Led Android development of a calendar and scheduling app, driving the Android 13 to 14 migration and integrating REST APIs. Resolved production issues using Firebase Crashlytics and managed Play Console releases.

Kotlin MVVM Android SDK KSP Hilt Firebase Crashlytics Gitlab SonarCloud Google Play Developer Console

Junior Android Developer

WayCool Foods and Products

Jan 2021 - Dec 2023 (2 years 11 months)

Built and maintained Android apps in Java with MVVM, including a B2B ordering app and internal enterprise apps. Integrated REST APIs, Firebase, and push notifications, and supported Play Store releases.

Java MVVM REST APIs Firebase Crashlytics Push Notifications Google Play Store

Freelance Android Developer

Self-Employed

Mar 2020 - Oct 2020 (7 months)

Delivered Android features for multiple clients, converting requirements into working screens and handling bug fixes. Integrated third-party services including Razorpay, Zendesk SMS API, and ApiXU weather API.

Android Razorpay Zendesk SMS API Apixu