We build digital products that actually get used — not just shipped.
Jostar grew from hundreds of freelance projects into a studio building mobile apps, web apps, and an ecosystem of tools for Indonesian professionals and small businesses.
Numbers you can verify yourself
All of it comes straight from our Fastwork profile — not internal claims.
From a single freelance order to a studio
No big leap — just projects finished one by one, and clients who came back.
- 01December 2020
It started on Fastwork
It all began with freelance projects on Fastwork. Step by step we became a top freelancer for mobile app development, with a 100% completion rate and clients who kept coming back.
- 02Specialisation
Going all in on mobile
Flutter became our default: one codebase for Android & iOS with native-quality results. It produced apps for event operations, mosques, AC service businesses, healthcare, local ride-hailing, and educational games.
- 03Jostar
Forming our own studio
Two missions we hold to: helping clients build custom products, and providing an ecosystem of SaaS tools that serve professionals and small businesses in Indonesia.
- 04Today
The Jostar tool ecosystem
Invoices, CVs, certificates, formal letters, and a freelancer CRM — our own products, free for anyone to try, and living proof of the quality we build.
Four things we never compromise on
Handing a project to a developer is a big decision. So we carry the risk with you, instead of leaving it all on you.
Used, not just shipped
Features are judged by whether people actually use them. If one adds no value, we suggest cutting it — not billing for it.
Progress you can see
Regular WhatsApp updates with previews, and milestone-based payments — never everything up front.
Code & access are 100% yours
Repository, hosting, and database are handed over in your name. No lock-in to us.
Fast replies
Usually answered within minutes during working hours, plus a 30-day bugfix warranty after handover.
One team, from idea to production
Mobile, web, and backend all happen in one place — no finger-pointing between vendors.
Mobile App Development
Native-quality Android & iOS apps built with Flutter. Fast performance, one codebase.
Web App Development
Modern web with Next.js. SEO-friendly, fast, scalable, and production-ready.
Cloud & Backend
Secure, scalable backend and database setup. Auth, payments, real-time sync.
Apps already running in their users' hands
A few screens from projects we have shipped — from field operations to consumer-facing services.
Got an idea you want built?
Tell us what you need — we will help map out the features, the estimate, and the most sensible way to start.