Web & mobile apps
Web and apps people love to open.
E-commerce, booking platforms and native-quality apps — built for speed and conversion.
In short
What does a web and mobile app development company do?
A web and mobile app development company designs, builds and launches websites, e-commerce stores and iOS and Android apps, then keeps them running. HeySheep builds with Next.js and Flutter from Singapore and Da Nang, and handles App Store and Google Play releases.
Outcomes
What changes for your business.
Fast everywhere
Server-rendered web and Flutter apps that feel native on every device.
Built to sell
Checkout, payments and analytics designed around conversion.
Store-ready
We handle App Store and Google Play submission, review and releases.
What we deliver
- Corporate & marketing websites
- E-commerce (Magento, headless, custom)
- Booking & marketplace platforms
- iOS & Android (Flutter)
- Admin portals & back-offices
- SEO & performance
How we work
From first call to running in production.
- 01DiscoverMap the manual work. Fixed plan in days.
- 02DesignA clickable prototype before any code.
- 03BuildWorking software every two weeks.
- 04RunLaunch, monitor, keep improving.
Project
Fixed scope, fixed timeline.
Dedicated team
Your engineers in Da Nang, managed by us.
Forward deployed
Senior engineers in your team until it's live.
Case studies
Measured results.
Projects where this work made a difference you can see: before and after, with the numbers.
Magento 2 HeyShop · Live Oct 2026A French chocolatier's shop, rebuilt on HeyShop.
- lighter pages
- 6–7×
- fewer scripts
- 16×
- mobile Lighthouse score
- 98
FAQ
Questions, answered.
How long does it take to build a mobile app?
A first release typically ships in 8–12 weeks, depending on features and integrations. We plan releases so you can launch early and iterate.
Do you build for both iOS and Android?
Yes. We use Flutter for a single high-quality codebase across iOS and Android, and native modules where needed.
Can you improve our existing website's SEO and speed?
Yes. We audit Core Web Vitals, structure and content, then fix what holds rankings back — this site is built to the same standard.
Which e-commerce platforms do you build on?
Magento 2, headless storefronts (Next.js on a commerce back end) and custom platforms with Stripe — chosen by catalogue size, integrations and budget. Gain City, Eikou and PacX are examples.
Do you maintain websites and apps after launch?
Yes. Support plans cover OS and framework updates, App Store and Google Play releases, monitoring, fixes and improvements. Gain City has worked with us for more than five years.
Related services
Custom software development
Platforms and internal systems built around how your business actually works.
AI development & process automation
AI agents, document AI and automations that remove the copy-paste, re-typing and chasing from your operations.
Forward deployed engineers
Senior engineers embedded with your team, using AI to ship faster.
Tell us what's still manual.
A senior engineer replies within one business day.