Android in Kotlin. PureScript on a checkout page millions of people pay through. Agent systems that produce finished artifacts instead of demos.
Word-by-word lyrics on your Android lock screen. Any music player, any phone.
Tip
1,000+ installs in month one. 5,000+ today. Zero spent on ads.
23,491 lines of Kotlin, 100% Compose, four months, one developer.
flowchart LR
P["Any player"] --> L["One MediaSession listener"]
L --> A["Anchor to monotonic clock"]
A --> D["Dead-reckon at 30 Hz"]
D --> S["Lock screen · AOD · widgets"]
How it stays in sync
- Dead-reckoned, not polled. Position is anchored to
SystemClock.elapsedRealtime()and extrapolated every frame — exact sync without hammering the player. - Word timing is modelled. LRC gives only line stamps, so sing-time is estimated per character, clamped against the real line window, and scaled so the last word lights on the beat.
- Widgets reuse the lock screen's draw code through an off-screen
CanvasDrawScope— no Compose runtime, just a bitmap. - Privacy is in the manifest, not the policy. No
QUERY_ALL_PACKAGES, no storage or media permissions at all.
Consumer-powered healthcare for gig workers. My main focus at Juspay right now.
Closed source, so this is deliberately all the detail there is — happy to talk about the engineering in a conversation.
A topic goes in, an upload-ready 1080p video comes out — researched, scripted, narrated, shot, cut and tagged. 26,543 lines of Python, 15 stages, one command.
The hard parts
- No API key anywhere. Every model call shells out to the Claude Code CLI headless, with a JSON schema as the output contract.
- Narration never leaves the machine. Kokoro-82M runs locally on Apple Silicon under a prosody planner that derives rate and pitch from the scene's mood.
- Relevant, or nothing. Footage selection may return nothing; an empty pick becomes a typographic card, because a card beats misleading footage.
- Every run stops at a human gate with a claims table and source URLs. The editorial pass is a designed step.
I build features on Payment Page — Juspay's hosted checkout, used by thousands of merchants and reaching millions of people paying for things.
It's written in PureScript. Strict purely-functional types, in production, on the checkout screen where a bug is somebody's money. Juspay open-sourced the framework underneath it as purescript-presto.
The repo is private, so there's nothing to link. PureScript, Payment Page and the scale figures are all from Juspay's public docs and marketing.
| Repo | What it is |
|---|---|
| exolock | Android app locker. PBKDF2-HMAC-SHA256 at 120,000 iterations, constant-time compare, nothing in plaintext. 41 Kotlin files, zero Java. |
| Learner | MIT-licensed Django LMS, written because the one my college used was buggy. |
| Local-Music-Player | Self-hosted FastAPI music server — ID3 tags, embedded cover art, playlists. |
| LottoBit | USD-priced ETH lottery in Solidity, tested three ways: mainnet fork, mocks, testnet. |
20 pull requests authored, 17 merged — 15 into other people's repositories.
Coroutines Solidity ffmpeg GitHub Actions
More stats, and why the byte counts lie
Three old repos of mine committed their virtualenvs, which alone account for tens of megabytes of "Python". Measured on code I actually wrote, my public GitHub is roughly 33% Kotlin, 19% JavaScript, 15% CSS, 10% Python — the C and C++ entirely auto-generated Flutter desktop scaffolding.
Building something that has to be correct at 3 a.m.? Let's talk.