Product studio · est. 2026
Design & engineering under one roof.
We design, build and launch web and mobile products, AI assisted and shipped fast. Secure, and ready for search and AI answer engines from day one.
- Launch
- 4–8 weeks
- Quote
- 24 hours
- Support
- 3 months
- Base
- Jakarta, ID
The same record, rendered for people or for machines.
Built in-house
Products we designed, built & shipped
These are all our own products, each live at its own address. We build for clients the same way we build for ourselves.
What we do
Four ways we ship
Websites & web apps
Fast, modern sites and web apps built with Next.js and TypeScript, shipped to production with AI assisted development.
Mobile apps
Native 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.
Who we work with
Find the version of this that is about you
You need a real first version in weeks, not a six month build.
We scope to the smallest thing that can launch and grow, then ship it to production. You get working software every week, so the thing you are funding is visible the whole way.
Fixed scope and a fixed price before work starts
A launchable first version, not a prototype
Analytics and structured data wired in at launch
Your repo, your accounts, no lock-in
How it works
From call to launch in four steps
Fixed scope, fixed price, and working software in your hands every week of it.
- Step 01
Discovery call
A 20 minute call to understand the product, scope and timeline.
- Step 02
Plan & price
Within 24 hours: a fixed scope, a timeline and a fixed price.
- Step 03
Design & build
Weekly demos. You watch the product come together in real time.
- Step 04
Launch & support
We ship to production and stay on for the first months live.
Every buildAI assisted developmentFaster deliverySEO, GEO & AEO readySecure by default
Proof, not a promise
Open machine view →Read this site the way an answer engine does
We sell sites that ChatGPT, Gemini and Perplexity can read and cite. So ours ships a plain-text mirror of everything on it, plus an llms.txt. Every build we hand over gets the same treatment.
Who you will be working with
“You talk to the person who builds it. No account manager, no handoff, no relay race.”
Ridho founded fivetwentyone after a decade in search and product engineering. He scopes every project himself, stays on it through launch, and is the one who answers when you write in.
Ridho Putradi S'Gara
Founder · PT Optimasi Mesin Pencari
From the blog
Recent notes from the studio
Working notes from live projects. What we tried, what shipped, what we would do differently.
How to Secure a Vibe-Coded Website: A Founder's Guide for 2026
Vibe-coded sites do not leak because AI writes bad code. They leak because the security layer never gets written. Here is how a founder can audit and harden an AI-built website, from exposed keys to Row-Level Security.
September 15, 202610 min
The Development Documentation You Should Require (2026 Founder's Guide)
The development documentation a founder should require before a developer leaves or something breaks, and why each piece decides whether you own your product or just rent it.
September 15, 20268 min
Are Vibe-Coded Websites Bad? An Honest Answer for Founders
A vibe-coded website is fine for a prototype and a liability as your real site. Where it works, the security and SEO risks when it goes live, and how to keep the speed.
September 14, 20269 min
FAQ
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.
Got something to build?
Tell us about your product. We come back within 24 hours with a plan, a timeline and a fixed price.