Enterprise Mobile Apps for Sydney's Leading Companies
We're a Sydney mobile app team that works with ASX-listed companies and startups alike. iOS, Android, React Native, native -- whatever the platform, we ship apps that actually work for fintech, retail and healthcare.
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You're in Safe Hands
Big Australian companies keep coming back to us for their mobile apps. Here's what makes that happen.
15+ Years Shipping Apps
15+ years building mobile apps for companies like Medibank, Kmart and Telstra. We've shipped apps that millions of Australians use every day.
100% Delivery Success
Every mobile app we've built has shipped successfully. No failed projects, no abandoned codebases. We finish what we start.
Seniors Only
Senior developers who know React Native, Flutter, iOS and Android inside out. Not a team of juniors supervised by one senior -- everyone on your project knows what they're doing.
Mobile Apps for Sydney Enterprise
We build mobile apps across these industries, with the security and performance requirements each one demands.
Banking & Fintech
Mobile banking, payments and trading platforms with biometric auth, encryption and APRA-compliant security baked in from day one.
Retail & E-commerce
Shopping apps that convert for Australian retailers. Apple Pay, Google Pay and checkout flows that don't lose customers at the last step.
Healthcare
Patient apps, telehealth platforms and clinical tools that integrate with Australian health systems and meet compliance requirements.
Wealth & Insurance
Portfolio tracking, claims management and member apps for Sydney financial services firms. Built to be secure and actually pleasant to use.
Consumer Brands
Brand apps and loyalty programs that people actually keep on their phone. Good design helps, but retention comes from genuine usefulness.
Internal Enterprise
Staff apps, field service tools and internal comms for large organisations. SSO, MDM and all the enterprise requirements your IT team will ask about.
Success Stories
Here's what we've shipped recently
Award-Winning Mobile Banking App
We built Newcastle Permanent's mobile banking app from scratch. It won a Silver Design Award and became the main way their customers do their banking.
Medibank
Mobile platform with a 4.7 rating and 99.9% uptime serving 100,000+ users. Doctors and patients both find it straightforward to use.
Kmart
Consolidated 40+ shop floor functions into one device, reducing operational time by 60% across 300+ stores nationwide.
Telstra
Australia-wide IoT asset tracking platform with 4.6 rating and 25,000+ active users tracking millions of assets daily.
Want Similar Results?
Book a free strategy session and we'll talk through your app idea, what it'll take to build, and what kind of results you can expect.
Get Your Free Strategy SessionWhy Team 400
We're not AI consultants who started yesterday and can't code. We're top engineers who've been building business software & AI systems for 25+ years.
Top Engineers
Top 5% talent. 10+ years experience each. Principal-level engineers and solution architects. We've built the integrations your AI needs to actually work.
R&D-Driven
Early adopters of Claude Workspaces, AI Agents, and the latest AI tools. We test what's next so you get what actually works in production.
We Make It Work
We don't walk away until it's successful. No matter what obstacles come up, we find a way. Your AI project will work, that's not negotiable.
Michael Ridland
25+ years developing AI-driven software solutions. Founded and scaled an award-winning AI consultancy from startup to 85 professionals. Microsoft MVP Alumni, international speaker, and creator of influential open-source projects.
What Our Clients Say
Real results from real Australian businesses
"This work team is absolutely outstanding"
CEO
Cargo Guardian
"Your work is great, its going to save us a huge amount of time"
CEO
Coast Smoke Alarms
Trusted by Sydney's Best
We've built mobile apps for some of Australia's biggest companies. They stick with us because we handle the hard parts -- security, scale, compliance -- without drama.
- ASX-100 experience
Apps for multiple publicly-listed Australian companies
- Enterprise security
SOC 2, APRA and Privacy Act compliant mobile solutions
- Senior engineers only
Your project is built by experienced developers, not outsourced to juniors
What Our Clients Say
"The banking app Team 400 built us has a 4.8 rating and processes $50M in transactions every day."
Sydney Financial Services Company
"Mobile revenue went up 340% in the first year after Team 400 rebuilt our app."
Australian Retail Brand
How We Build Apps
How we actually build apps, from first conversation to App Store launch
Discovery & Strategy
We figure out what you actually need through workshops and conversations -- not just what you think you need.
You get:
Clickable prototype + clear cost range
- Stakeholder interviews
- User research & personas
- Technical feasibility study
Design & Validation
We prototype fast and test with real users before writing production code. Cheaper to fix a Figma file than rewrite an app.
You get:
Tested designs + validated user flows
- UX/UI design & prototyping
- User testing & feedback
- Design system creation
Agile Development
Two-week sprints with a working build on your phone at the end of each one. You'll always know where things are up to.
You get:
Working builds on your device every 2 weeks
- Sprint planning & execution
- Continuous integration/deployment
- Regular demos & feedback
Launch & Optimise
We handle App Store submission, monitor performance after launch, and stick around to optimise based on real usage data.
You get:
App Store deployment + 30-day optimisation support
- App Store deployment
- Performance monitoring
- Ongoing optimisation
Why Our Process Works
Predictable Timelines
You'll know the milestones upfront and we'll hit them. No vague timelines or shifting goalposts
You're in the Loop
Regular demos and check-ins so you're never wondering what's happening with your project
Measurable Results
We test with real users and let the data guide what gets built next
Start Risk-Free with Our Discovery Phase
Picking a mobile dev team is a big call. So we've made it easy to try us out before committing to a full build.
Fixed-Price Discovery Phase
- Clear, upfront pricing -- no surprises
- Clickable prototype to test with users
- Detailed cost range for full project
- Technical architecture & roadmap
No Obligation to Continue
- Keep all deliverables regardless
- Use our plan with any development team
- Only proceed if you're 100% confident
- Senior developers only -- no juniors
Technologies We Work With
Cross-Platform
- React Native & Expo
- Flutter & Dart
- .NET MAUI
- Xamarin Forms
- Ionic & Capacitor
Native iOS & Android
- Swift & SwiftUI
- Kotlin & Jetpack Compose
- Objective-C
- Java for Android
- UIKit & Android SDK
Backend & Services
- Firebase & Firestore
- AWS Amplify
- Azure Mobile Apps
- RESTful APIs & GraphQL
- Push Notifications
Ready to Build Your Sydney Enterprise App?
Tell us about your project and we'll get back to you with honest advice on the best approach.
More Than Mobile Apps
Mobile apps are one piece of the puzzle. We also build AI-powered backends, web platforms and enterprise systems for Sydney organisations.
Mobile app development also available in