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.
Four ways we ship
Fast, modern sites and web apps built with Next.js and TypeScript, shipped to production with AI assisted development.
Native iOS and Android, or one cross platform codebase, built to ship to the stores.
RAG, agents and LLM workflows wired into your product, not bolted on the side.
Sites engineered to be found in Google and cited by ChatGPT, Gemini and Perplexity.
Products we built & shipped
WEB · MARKETING SITEThe flagship site for an AI search agency that engineers brands into the answers from ChatGPT, Gemini, Perplexity and Google AI Overviews. We designed and built it to load fast and be readable by both search engines and answer engines.
WEB · PERSONAL BRANDA personal brand site for an AI search and SEO consultant working across Southeast Asia. One clear page that earns trust, ranks in Google and gets cited in AI answers when people search for a consultant in the region.
WEB APP · DIRECTORYA living index of Indonesia's SEO specialists. An interactive, animated directory where practitioners create a profile, join the index and get discovered. Part product, part community.
AI assisted, fast, and built to be found.
We build with AI in the loop, so production quality work ships in a fraction of the usual time.
Weeks, not quarters. You see working software every week from kickoff to launch.
Every build is engineered to rank in search and be cited by AI answer engines.
HTTPS, hardened headers, sane auth and least privilege access on every project.
From call to launch in four steps
A 20 minute call to understand the product, scope and timeline.
Within 24 hours: a fixed scope, a timeline and a fixed price.
Weekly demos. You watch the product come together in real time.
We ship to production and stay on for the first months live.
Questions, answered
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'll come back within 24 hours with a plan, a timeline and a fixed price.