Everything between the idea and the live product.
Design and engineering sit in the same team, so scope, build and launch are one conversation. Every engagement gets a fixed scope, a timeline and a fixed price before work starts.
Websites & web apps
Fast, modern sites and web apps built with Next.js and TypeScript, shipped to production with AI assisted development.
Mobile apps
At capacityNative iOS and Android, or one cross platform codebase, built to ship to the stores.
Mobile builds are fully booked. The next slot opens in December 2026. Talk to us now to hold it.
AI features
RAG, agents and LLM workflows wired into your product, not bolted on the side.
SEO, GEO & AEO ready
Sites engineered to be found in Google and cited by ChatGPT, Gemini and Perplexity.
Three kinds of client
Early-stage founders
You need a real first version in weeks, not a six month build.
SME marketing leads
You own the site and the numbers that come off it.
Agency partners
You have the client and the creative. We are the build team.
AI assisted, fast, and built to be found.
AI assisted development
We build with AI in the loop, so production quality work ships in a fraction of the usual time.
Faster delivery
Weeks, not quarters. You see working software every week from kickoff to launch.
SEO, GEO & AEO ready
Every build is engineered to rank in search and be cited by AI answer engines.
Secure by default
HTTPS, hardened headers, sane auth and least privilege access on every project.
From call to launch in four steps
Discovery call
A 20 minute call to understand the product, scope and timeline.
Plan & price
Within 24 hours: a fixed scope, a timeline and a fixed price.
Design & build
Weekly demos. You watch the product come together in real time.
Launch & support
We ship to production and stay on for the first months live.
Questions, answered
One panel open at a time. Everything stays in the page, so search and answer engines can read it without opening anything.
What does fivetwentyone do?
fivetwentyone is a product studio that designs, builds and launches web and mobile apps. We build AI assisted, so production quality software ships in weeks, and every build is SEO, GEO and AEO ready and secure by default.
How fast can you ship a website or app?
Most projects launch in four to eight weeks. Because we build AI assisted, we move faster than a traditional team without cutting quality, and you see working software every week.
What does SEO, GEO and AEO ready mean?
It means your site is built to be found in Google search (SEO), surfaced by generative engines like ChatGPT and Gemini (GEO), and lifted as a direct answer by answer engines (AEO). We bake in clean semantic markup, structured data and fast performance.
How much does a project cost?
Every project gets a fixed scope, timeline and price after a short discovery call. We send a plan within 24 hours, so there are no surprise invoices and no scope creep.
Where is fivetwentyone based?
We are based in Jakarta, Indonesia, operating as PT Optimasi Mesin Pencari, and we work with founders and teams across Southeast Asia and beyond.
What technologies do you build with?
We build web apps with Next.js and TypeScript, native and cross platform mobile apps, and AI features such as retrieval augmented generation and agents. Everything ships to production with CI and monitoring.
Start with a 20 minute call.
You will have a plan, a timeline and a fixed price within 24 hours of it.