Open by default
Repositories are public from the first commit. The code is licensed, forkable, and reviewable — not a demo that disappears once it has served its purpose.
Solo software studio · Sri Lanka
Open source,
built in the open.
Siyana Code is the solo software studio of Rasindu Appuhami — open-source systems, tools, and education projects, built in public and available for client work.
- Repositories
- 15
- Licenses
- MIT
- Accounts required
- 0
Siyana Lang — a language built to write an operating system.
What Siyana Code is
Three promises, kept in public
Everything under this name shares the same habits. They are not marketing — they are the constraints the projects are built around.
Built in public
The work is the portfolio. Real projects, real process, real gaps — published as they happen rather than polished after the fact.
Local-first & private
Tools that respect your data. No account, no server, no telemetry — your files and your ledger stay on your device unless you move them yourself.
The work
Projects
A systems language, a local-first viewer, an offline ledger, a free maths site — and the smaller experiments that came before them. All open source.
SystemsIn progress
Siyana-Lang
A general-purpose language built for one constraint: writing an operating system without an external toolchain.
View repositoryToolsShipped
Siyana-Markdown-Viewer
A fast, safe, local-first Markdown viewer for Windows and Linux. No account, no upload, no telemetry.
View repositoryAppsShipped
Siyana-Debt-Tracker
A private, offline-first ledger for the money you lend and borrow. Your ledger never leaves the phone.
View repositoryEducationGrowing
maths-guru-website
Free maths learning for Sri Lankan students, Grade 6 to O-Level, matched to the NIE syllabus.
View repositoryEverything else
- Siyana-OS
A hobby x86_64 operating system in Rust and assembly — bootloader, kernel, and the long road after.
- Siyana-Chat
A messaging app whose log is authoritative on both sides, so online and offline behave the same.
- ol-mcq-practice
OL past-paper MCQ practice for Sri Lankan students, in Sinhala.
- Siyana-Mobile-Calculator
An elegant scientific calculator and 12-in-1 unit converter.
- siyana-shop-pos
An inventory and point-of-sale system — FastAPI backend with a React Native mobile client.
- Siyana-Seed
A single-expression arithmetic language in Python — the first seed of the Siyana language family.
- project-02-siyana-type
A typing practice website, built while learning the basics of the web.
- project-03-siyana-board
A Kanban board with drag-and-drop and localStorage, in vanilla JavaScript.
How I work
The process is the product
Open source is not just a license. It is a way of working — and the way of working is what makes the projects worth reading.
Research the problem
Every project starts with the problem written down, not a framework choice. The research lives in the repository, in plain English, next to the code.
Write the decisions
Architecture decision records and a decision log. If a choice is not written down, it is not a choice — and the next person to read the code should not have to guess.
Build in the open
Small, reviewed commits. Tests that fail for a reason. Nothing hidden behind a private branch waiting for a reveal that never comes.
Ship one real thing
One real project at a time. Finished and usable beats ten half-built ideas — and a shipped tool teaches more than a planned one.
Client work
Available for select projects
Siyana Code is a studio of one. That means the person you email is the person who writes the code — and the open-source work is the evidence.
Web applications
Next.js and TypeScript, accessible and fast, shipped with tests and a written decision log.
Mobile apps
React Native with Expo, and Flutter — offline-first, with data that stays on the device.
APIs & backends
FastAPI and Node, Postgres where it earns its place, and schemas that express the real invariants.
Systems & tooling
C and Rust, plus the Siyana language work — for when the cost has to be visible in the source.
Education technology
Syllabus-matched, mobile-first, low-data — built for the constraints students actually live with.
Start a conversation
Email is fastest — rchkaushalya@gmail.com. Tell me what you are trying to build and where you are stuck.