What I do.
The software a business runs on, from the screen people tap to the server behind it.
Web apps
Dashboards, portals and booking systems that work on every screen.
Mobile apps
iOS and Android apps from one codebase.
Desktop apps
Any kind of desktop app: offline-first, fast, and kept up to date for you.
3D experiences
Interactive 3D scenes in the browser that stay fast on phones.
Business systems
Stock, sales, staff and reports, built around how your company already works.
AI agents for business
Agents connected to your data and tools, answering customers and doing the paperwork.
Backend development
APIs, databases, sign-in and integrations that hold up under load.
Projects.
Done 10Ongoing 8
Tools are the easy part.
AI writes the syntax now. What I bring is the thinking: how a problem breaks down, where the data should live, and when the work is actually done. These are just the tools I happen to use.
- TypeScript
- React
- TanStack
- Three.js
- NestJS
- GraphQL
- REST API
- MongoDB
- Drizzle
- nginx
- GPT Codex
- Expo
- pnpm
- Python
- Next.js
- Tailwind CSS
- Node.js
- Express.js
- FastAPI
- PostgreSQL
- Redis
- Docker
- Claude
- React Native
- Vite
The short version.
I am a software engineer in Ulaanbaatar. I build products end to end: the app people use, the API behind it and the console the team runs it from, whether it is a startup's first release or a large company's next system.
I work in short loops. You see something working in the first days, we cut what does not matter, and the rest ships when it is ready, not when it is perfect.
After launch I stay close: monitoring, fixes, and the next feature, until your own team takes it over.
- years building products
- 3+
- projects shipped
- 15+
Notes.
News from the work, and tips for planning and running your product.
Read the blogGet a quote.
Tell me what you want to build. I reply within one working day with questions, a rough plan and a price range.
Prefer email?
bayarjavkhlan.ba@gmail.comUlaanbaatar · a reply within one working day
Not a project? Offer me a role, or write about anything else.
From a first release to systems at scale. Built in Ulaanbaatar.