About me

I build mobile apps, and ship my own.

I'm Cao Thiem Nguyen, an iOS & mobile developer in Hanoi. I build iOS, Android and Flutter products for clients, and I design, build and publish apps of my own.

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6+ years in mobileiOS · Android · FlutterBased in Hanoi

Cao Thiem NguyenMobile Developer · NTQ Solution

80+Apps shipped

31K+Downloads

6+Years

17K+ on the App Store · 14K+ on Google Play

SwiftUIKitObjective-CFlutterMVVMRTC / VoIPJenkinsFastlaneAdMob

At work

I turn complex product requirements into focused, dependable apps: security cameras, smart-home and networking devices, social platforms, chat, voice/video calls, e-commerce and in-app payments.

On my own

I own the whole loop for my apps: product, design, code, store listings, ads and analytics. I care about clean architecture, performance and a smooth release process.

Experience

Where I've worked.

Product teams, outsourcing projects and independent app development.

Sep 2024 — Now

Mobile Developer

NTQ Solution JSC · Hanoi

Full-time, on-site. Outsourcing projects for the company's clients across iOS, Android and Flutter.

Develop and implement software solutions based on client requirements.
Work on social media, real-time chat and voice-call (RTC) features with UIKit.
Fix bugs and maintain client apps after release.

Mar 2024 — Sep 2024

Middle iOS Developer

Rikkeisoft · Hanoi

Full-time, on-site. Outsourcing on various projects for the company's clients.

Develop and implement software solutions based on client requirements.
Work on smart-home devices, e-commerce, social media, chat, voice/video calls and in-app payments.
Fix bugs, upgrade, submit and maintain apps, building UI with Interface Builder and Auto Layout.

Sep 2023 — May 2024

Indie Mobile Developer

Independent · Remote

Built and released 80+ self-owned iOS, Android and Flutter apps, reaching more than 20,000 downloads.

Owned every step: idea, UI design, development, App Store / Google Play listings and releases.
Monetized with AdMob and in-app purchases, and iterated on apps from store analytics.

Jul 2021 — Mar 2024

iOS Developer

VNPT Technology · Hanoi

Engineered apps that connect, configure and control VNPT security cameras, smart-home devices and networking hardware.

Worked on ONE Home, an app to connect, monitor and remotely control smart-home devices and IP cameras.
Worked on ONE Link, Wi-Fi and access-point management for VNPT customers.
Managed certificates, provisioning and CI/CD release pipelines with Jenkins and Fastlane.

Sep 2020 — Aug 2021

Mobile Developer

Teneocto Technologies · Hanoi

Started my iOS career, then contributed to Japanese live-streaming and browser-game products.

Learned production iOS with MVC / MVVM, Auto Layout and memory management.
Collaborated with a Japanese client team on live-streaming features and releases.

My apps

Products I build, ship and keep improving.

Designed, engineered and released by me, end to end.

01 · Core appEducation · iPhone, iPad & Android

Classly

10K+ downloads64+ ratings

Attendance, timetable and deadlines in one calm, private place, so students always know what they can miss and what they can't.

Today timeline: mark every class in one tap or a swipe.
Insights per subject: how many classes you can still miss, or need to attend to recover.
Planner, reminders and reports for exams, assignments and weekly trends.
Private by design: offline, no account, no location access.

FlutterOffline-firstHome Screen widgetGoogle Calendar sync

App Store Google Play Website

02 · Core appCasual game · Focus training

Orbwatch

Follow the golden orb through the chaos. A calm eye-tracking game that sharpens attention and visual memory.

Memorize, track, pick: remember the target orbs, follow them as they bounce, then tap the right ones.
200 hand-balanced levels across 4 chapters, plus Endless and a seeded Daily challenge.
Twists like fog and new arena shapes keep every chapter fresh.
Deterministic physics: every level replays exactly from its seed.

FlutterFlameGame designAdMob

Google Play

03 · Core appDeveloper tool · iPhone, iPad & Android

LogCat Analyzer

2.3K+ downloads on Google Play

Analyze Android log data right on your phone or tablet. Find crashes, ANRs and performance issues, no computer required.

Issue detection for crashes, ANR, memory pressure, network errors, StrictMode and retry loops.
Explain & fix: likely root cause from the stack trace, with troubleshooting steps.
Crash timeline with grouped exceptions, severity and exportable reports.
Search & filter by level, package, tag or keyword.

iOSAndroidLog parsingDeveloper tools

App Store Google Play

04 · Core appPrivacy · iPhone & Android

Privault

A local-first private vault for photos, videos, documents and other files. No account, no cloud sync.

Collections for different personal spaces, with import from Photos, Files and share flows.
PIN and biometric lock to keep the vault private.
Preview, search, sort and move files, with Trash before permanent removal.
Encrypted backup export and import with Privault PRO.

iOSAndroidBiometricsLocal-first

App Store Google Play Website