DEV Community: Fardeen Sayyed

Available for Hire: Native Android (Kotlin & Jetpack Compose) & Full-Stack Web/Firebase Developer

Fardeen Sayyed — Tue, 13 Oct 2026 16:01:23 +0000

Hi everyone! 👋

I'm Fardeen Sayyed, a Native Android & Full-Stack Software Engineer specializing in building scalable mobile applications and custom web solutions.

🛠️ What I Can Build for You:

Native Android Applications: High-speed, responsive Android apps using Kotlin, Jetpack Compose, Room DB, and Material 3 UI.
Full-Stack Web & Custom CMS: Modern, responsive web applications and dashboards using JavaScript, HTML5, CSS3, and custom CMS logic.
Firebase Suite Integration: Authentication, Firestore, Realtime Database, Cloud Storage, and Security Rules.
Bug Fixes & App Optimization: Rapid bug fixing, crash repairs, and performance tuning for existing Android apps and websites.

📂 Recent Open-Source Work:

Check out my latest open-source project NetShield — a 100% native Kotlin VPN & firewall engine built entirely without 3rd-party networking SDKs:

GitHub: github.com/FardeenSayyed/NetShield
Interactive Architecture Diagram: netshield_architecture.html

📩 Let's Work Together!

If you're a founder, agency owner, or client needing a developer for your next mobile or web project:

Hire me on Fiverr: fiverr.com/fardeen_sayyed
Connect on LinkedIn: linkedin.com/in/fardeen-sayyed-android

How I Built NetShield: A 100% Native Android VPN & Firewall Engine in Pure Kotlin & Jetpack Compose

Fardeen Sayyed — Tue, 13 Oct 2026 13:44:39 +0000

🚀 NetShield is Live & Open-Source! 🛡️

A few days ago, I posted about building a 100% native Android VPN and privacy engine. Today, NetShield v1.0.0 is officially launched on GitHub!

Building a local network protection engine from scratch came with major technical challenges and engineering learnings:

💡 Key Engineering Learnings & Challenges: • Network Level vs. Application Level: I learned why DNS-level VPNs excel at blocking 3rd-party ad networks, pop-ups, and tracking domains across 100% of apps, but cannot block inlined first-party video streams (like YouTube or Instagram) without breaking main video playback. • Overcoming Battery Doze Mode: Solved Android OEM background battery killers by implementing a zero-CPU CountDownLatch wait thread and an in-memory LRU DNS cache to keep idle battery drain under ~1–2%. • Push Notification Reliability: Added specialized fast-path routing for FCM (mtalk.google.com) and WhatsApp push sockets so real-time notifications deliver instantly even in deep sleep.

⚡ Core Architecture Highlights: • 100% Native Kotlin: Built using Android standard library (VpnService, DatagramSocket) with zero 3rd-party C++ binaries. • O(k) Reverse Label Trie: Instant domain sinkholing for ads, trackers, and adult platforms in < 1ms. • Per-App Firewall: Resolves socket owner UIDs (getConnectionOwnerUid) for granular internet control. • Room DB v5 Persistence: Local SQLite storage for rules, stats, and custom domains.

📂 GitHub Repository: https://github.com/FardeenSayyed/NetShield
🌐 Interactive Architecture Diagram: https://htmlpreview.github.io/?https://github.com/FardeenSayyed/NetShield/blob/main/docs/netshield_architecture.html
📥 Download Release APK: https://github.com/FardeenSayyed/NetShield/releases/tag/v1.0.0

💼 Looking for Custom Android & Full-Stack Development?
I help startups and businesses build high-performance Native Android Apps (Kotlin / Jetpack Compose), Web Applications / CMS, and Firebase Backends.

📩 DM me on LinkedIn or hire me on Fiverr:
👉 https://www.fiverr.com/fardeen_sayyed

AndroidDev #Kotlin #JetpackCompose #MobileSecurity #OpenSource #SoftwareEngineering #FreelanceDeveloper #WebDevelopment #Firebase

Project Launch: Building and Deploying WALAWI INVENTORY MANAGER

Fardeen Sayyed — Wed, 19 Aug 2026 15:10:35 +0000

🚀 Thrilled to announce the successful deployment of WALAWI INVENTORY MANAGER! 🚀

What began as a consulting engagement evolved into building a high-performance, custom internal business application designed to track stock, process sales, and sync business metrics in real-time.

To maximize loading speeds and eliminate bundle bloat, we skipped heavy frameworks and built this using a serverless, decoupled architecture:

🔹 UI & Logic: Semantic HTML5, CSS3, and optimized Vanilla JavaScript.
🔹 Offline Resilience: Service Worker integration (sw.js) to cache assets and maintain core baseline functionality during network drops.
🔹 Data Backend: Google Firebase (Auth for secure user sessions + Firestore for real-time, document-oriented data synchronization).

A massive highlight was navigating custom domain routing variations over cPanel-managed reseller networks to cleanly resolve ACME challenges for automated SSL provisioning. The system is now live on its custom domain, computing retail math flawlessly in production.

Thank you to my client for an exceptional collaboration. We are already mapping out Phase 2, including advanced date-range filtering, low-stock alerts, and secure audit trails.

WebDevelopment #Firebase #JavaScript #FullStack #SoftwareEngineering #CloudHosting #InventoryManagement

I am offering Android bug fixing services (Kotlin & Jetpack Compose)

Fardeen Sayyed — Wed, 27 May 2026 11:00:42 +0000

Hello Dev Community 👋

I am an Android Developer specializing in Kotlin and Jetpack Compose.

I am currently offering freelance services for:

✔ Android app bug fixing
✔ Firebase issues
✔ UI fixes in Jetpack Compose
✔ Crash debugging
✔ Performance improvements

Skills:

Kotlin
Jetpack Compose
Firebase
Android Studio

If you are facing any Android app issues, feel free to contact me.

Fiverr Gig:
https://www.fiverr.com/s/ljp1BzA

I am available for small and medium Android tasks.

Thank you!

My first Android App - NightLock

Fardeen Sayyed — Sun, 24 May 2026 16:22:06 +0000

I built my first Android app called NightLock — an open-source digital wellbeing app focused on Focus Mode, Bedtime Lock, and app usage control to reduce distractions and improve screen habits.

I originally made it for myself, family, and friends, and now I’ve open-sourced it.

I’d really appreciate:

feedback
testers
bug reports
suggestions
contributors

I’m also looking for help/advice regarding Play Store publishing.

I’m also currently looking for Android/software development opportunities, freelance work, or junior developer roles, so if you know of any openings or would like to collaborate, feel free to reach out.

GitHub Repo:
NightLock Repo

Release APK
NightLock_v1.0.0.apk

Thanks for checking it out 🙌