Software that works,teams that deliver.
9codeX is a software development company from Novi Sad, Serbia. We design, build and maintain mobile apps, web platforms, backends and games — and we put together the right team for whatever your project needs.
Mobile
Native iOS and Android apps, or cross-platform with Flutter and React Native — fast, reliable and polished down to the last detail.
Web & Backend
Web applications, APIs and cloud backends that scale — from MVPs to business-critical systems in production.
Games
Mobile games built in Unity and Flutter, including real-time multiplayer, ads and in-app purchases.
Our Services
End-to-end software development — from the first idea to a live product we keep improving.
Mobile App Development
iOS (Swift, SwiftUI), Android (Kotlin, Jetpack Compose) and cross-platform apps, published and maintained on both stores.
Web Development
Modern, responsive web apps, dashboards and admin panels with React, Next.js and other proven frameworks.
Backend & Cloud
APIs, databases, real-time systems and serverless backends on Firebase, Node.js and the major cloud platforms.
Game Development
Casual and multiplayer mobile games, from prototype and game design to launch, monetization and live ops.
UX & UI Design
User research, wireframes, prototypes and polished interfaces designed for real users, not just screenshots.
QA, Maintenance & Support
Testing, monitoring, updates and long-term support — we stay with your product after launch.
The right team for every project
9codeX builds software for clients and publishes its own apps and games. We work with a network of experienced engineers and designers, so every project gets exactly the people it needs — no more, no less.
Need a single senior developer, a full cross-functional team, or someone to take over an existing codebase? We put the team together, own the delivery, and communicate clearly every step of the way.
- Senior engineers across mobile, web, backend and games
- Teams that scale up or down as your project changes
- Remote-first, fluent English, direct communication
- You own 100% of the code and accounts
Dedicated team
A complete team — developers, design, QA and project management — that owns your product end to end.
Team extension
Experienced engineers who join your existing team, adopt your process and start delivering quickly.
Fixed-scope project
A clear scope, price and deadline — ideal for MVPs and well-defined products.
Products We've Built
Mobile apps, games and web platforms we've designed, built and launched.
Fortress of the Believer
حصن المؤمن - أذكار وأدعية
Your daily companion for morning and evening remembrances and supplications — with prayer-time reminders, home screen widgets, a built-in counter, and 139 topics. Works offline, no ads.
Rumblock
A fast 1v1 block battle. You and your rival get the exact same pieces in the same order, so every win is earned. Race or duel online, play a friend with a code, or take on the bot offline.
Prerasli
A marketplace in Serbia for new and second-hand items for pregnancy, babies and kids up to 12. Every user gets their own store, with search by category and city and built-in messaging.
Paušal kalkulator
An app for flat-rate entrepreneurs in Serbia: digital turnover records (KPO), creating and sending invoices, and tracking yearly and per-client limits — synced with Google Sheets.
Let's build yours
Have an idea for an app, a platform or a game? Tell us about it — we'll help you shape it and assemble the team to build it.
Technologies
A modern, proven stack — and we pick what fits your project, not the other way around.
From idea to a live product
Discover
- Requirements
- Scope & estimate
- Architecture
- Team setup
Build
- UX & UI design
- Development
- Integrations
- Regular demos
Test
- QA
- Beta testing
- Performance
- Security
Launch
- Release
- Monitoring
- Maintenance
- New features
Questions we hear most often
What kind of projects do you take on?
Mobile apps, web applications, backends and APIs, and games — from new products and MVPs to taking over and improving existing systems.
How big is your team?
As big as your project needs. We work with a network of experienced engineers and designers and put together a team that fits the scope, from one senior developer to a full cross-functional team.
Do you take over existing codebases?
Yes. We start with a review of the code and infrastructure, tell you honestly what we find, and then continue development or stabilize what's there.
Who owns the code?
You do. All code, accounts and infrastructure belong to you from day one, and we're happy to sign an NDA before discussing details.
What happens after launch?
We stay on. We offer maintenance, monitoring, updates and new features, so your product stays fast, secure and up to date.
I'm a user of one of your apps and need help.
Visit our Support page or email office@ninecodex.com with the app name and a short description of the issue.
Get in Touch
Tell us what you're building. You'll get honest feedback and a rough estimate — no commitment. We usually reply within 2 business days.