Software engineer at Notable HealthBay Area, California
AJUppal
I build across the stack: zero-to-one services, AI and voice systems, infrastructure, and, off the clock, worlds that run in a browser.
At Notable, a healthcare AI company, I work across the stack: integrations, voice AI, the conversation and API layers, frontend to database, and the occasional flight to a customer’s site to make it work in the room.
Give it a mean, a spread and a sample size for two distributions and it samples both and overlays the histograms. Homework that turned into a small tool and then stayed.
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legacy-deviation.webp
Not made by the image recipe. No crop is on record for it.
Two distributions
Swipe sideways for the second distribution
The 2015 file itself, unmodified, seeded from its query stringOpen original ↗
Original artifact
Its own 2015 colours
Repaired
GrinchJumpc. 2015
Doodle Jump in three dimensions, built while I was learning three.js. Its keyboard library vanished along with a CDN, so the dependencies now live in the repo.
←→ Steer
Tap Steer
P Pause
Esc Exit
R Restart
The jump is not a control: landing on a platform is what throws him.
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legacy-grinchjump.webp
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2026-08-06
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Playable
Vendored three.js r70, served from its original URLOpen original ↗
Nothing left to run
Rendezvousc. 2020
A central place for UMass students to find each other through the classes they were taking. Everyone’s assignments in one calendar, a chat per lecture, and, that year, a Zoom link where the room number used to be.
React · Redux · Flask · PostgreSQL · GCP
The dashboard. Term’s classes down the left, every assignment in one calendar, the day’s lectures on the right.
Light
Dark
The same screen at the same second, one toggle apart. Thursday 14 October 2021, 5:16 in the afternoon, both times.
Light
Dark
One course, with its lecture chat open: the room the class talked in, the two problem sets due out of it, and the seed message every new room opens with. Same screen, one toggle apart, again.
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rendezvous-dashboard.webp
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2026-08-09
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rendezvous-day.webp
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rendezvous-chat-day.webp
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2026-08-09
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Also built
High school
PICKLE
Designed, built and calibrated low-cost air pollution monitors to make the problem visible. Hardware, firmware, cloud and data science in one project, with Sonoma Technology, BAAQMD and Manylabs.
C · Python · R · Time-series storage
02 / Experience
Eight roles, one through-line
Physics research, university software, first-engineer jobs, and production healthcare AI.
Most of my work has been building first versions of new systems.
8 roles, all shown
Rendered byStackFilter.tsx
Summer 2017
Bay Area Air Quality Management District
Air Quality Scientist and Data Analytics Intern · C · Python · Cloud data pipeline
Built, tested and calibrated low-cost air pollution monitors, and built the cloud networking interface for viewing their data from anywhere. Secured a $3,000 grant for Los Altos High School to bring monitor building into its APES curriculum.
Led a marketing campaign for a YouWeb project and built its campaign website and web application.
Jun 2019 - Aug 2019
Got It.AI
Software Engineering and AI Intern · Python · JavaScript · Chrome extensions
Built the ExcelChat Chrome extension, and a microservice automating dataflow through Got It Study while holding problem volume steady. Helped serve the QueryChat AI demo.
Oct 2019 - Oct 2020
UMass Amherst, Physics Department
Research Assistant · Python (numpy, scipy, pandas, matplotlib) · MATLAB
Simulated fluid dynamics for CO2 cooling in particle physics detectors.
Apr 2020 - Sep 2020
The Arena, Inc.
Software Engineering Intern · React · Google Cloud
First engineer at an education non-profit. Built a database and a React site helping students from non-traditional backgrounds find careers and programs.
Built and maintained the software professors used to acquire and share demonstrations across 20+ courses and 1000+ students. Ported a legacy WordPress site with a JSON backend to an Express, React and PostgreSQL application deployed on site. Published résumé · 2026
My team owns the voice and conversations platform at a healthcare AI company serving 100+ enterprise customers: the AI-driven patient calls and the whole stack under them, from the conversation services and workflow APIs down to carrier-facing telephony. It handles around 250,000 patient calls a month at 99% uptime, and I set the technical direction for patient identity, routing, observability and reliability. Published résumé · 2026
Design the telephony integrations down to the protocol - SIP and TLS, SRTP, caller-ID preservation, DTMF, DID routing - and I wrote the specification health systems build against to connect their phone systems to ours. It has driven more than $1M in ARR.
Own secure caller authentication end to end: EHR and FHIR patient lookup, one-time-code verification by SMS, and the auditable hand-off of a verified caller into a customer’s own call center. HIPAA-compliant verification across 5+ health systems.
Own reliability and incident response for voice: I lead the debriefs and turn failure modes into platform fixes, including customer-configurable fallback routing that keeps a caller connected when an upstream provider goes dark.
Lead the AI-powered testing capability for the flow builder, so a builder can trust a flow before it ever takes a real call. Flow success rates are above 90%.
Shipped multilingual conversations, configurable transfer workflows and builder-facing configuration, which cut new-customer launch time from weeks to days. I also contribute to the healthcare-integration core - HL7 and Mirth encounter ingestion, FHIR authorization, insurance data modeling - and mentor engineers from junior through senior.
Tech lead, mentor, and the primary reviewer for a distributed contractor team. Evidence pending
Education · 2018 - 2022
University of Massachusetts Amherst
Both degrees at once, in four years.
B.S. Computer Science
Dean’s List. Student software developer for the Physics Department.
B.S. Astrophysics
Dean’s List. Honors thesis. Research assistant in the Physics Department.
CS Machine Learning
CS Neural Networks
CS Algorithms
CS Computer Networking
Phys General Relativity
Phys Quantum Mechanics
Phys Computational Physics
Ind. Cosmology and Consciousness · independent study
03 / Projects
7 entries · 5 open to anyone
Seven projects
Five are live today. Two aren’t finished yet.
06:31 · 14.0 kn · seed 4193
Sailing, actually simulated.06:31, sea state moderate, wind at forty degrees, seed 4193. Sail full, 14 knots, no heel - all of it read straight off the HUD. Capture on this page · 6 Aug 2026
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saltline-lead-dawn.webp
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saltline-dawn-island-blue.png · 3,456 × 2,234
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2026-08-06
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Which held
the developer panel down the left edge, the top bar, and open water below the hull
An age-of-sail game you play in a browser. You captain a sloop, trade between islands, and get chased by raiders. The part I care about is the sailing itself: the boat isn’t steered like a car.
The ocean is generated from a seed. Drag the clock below - same seed, same wind, and the water reads completely differently at four in the morning than it does at sunset.
Off the wind
105°
Point of sail
Beam reach
Thrust
100%
Boat speed
16.0 kn
VMG
4.1 kn downwind
The curve is saltline’s own point-of-sail function, so the boat here behaves the way the boat there does. Drag it, or nudge it with the arrow keys. Thrust comes off the polar, boat speed comes off thrust, and VMG is the part of that speed going the way you actually want to go, which is why the fastest heading is almost never the useful one.Technical notes
Status
Live, with accounts
Multiplayer
Live, sail together, up to 20 players a sea
Transport
Colyseus rooms over WebSocket
Model
Point of sail sets thrust; thrust and heading set VMG
Luffing
Point too close to the wind and you stop
HUD
Relative wind, heel angle, thrust percent, VMG in knots
One seed at six times of day. Sea state moderate, wind at forty degrees, crest sharpness 0.68, seed 4193, identical in all six. Only the clock moved.
Drag the clock, or use the arrow keys
04:36Moon
Speed
14.4 kn
Rel. wind
66°
Thrust
89%
VMG
5.8 kn
At golden hour the sloop is doing 15 knots through the water but only 2.3 toward the mark; at sunrise it’s 13.6 and 11. Picking the angle is the whole game.
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saltline-arc-night.webp
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saltline-night-moon-wake.png · 3,456 × 2,234
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2026-08-06
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the developer panel down the left edge, and the bar above the viewport
saltline-arc-sunrise.webp
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saltline-dawn-island-ships.png · 3,456 × 2,234
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2026-08-06
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the developer panel down the left edge, and the bar above the viewport
saltline-arc-dawn.webp
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1,600 × 900 · 172 kB
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saltline-dawn-island-blue.png · 3,456 × 2,234
File dated
2026-08-06
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680 left · 75 top · 0 right · 597 bottom
Which held
the developer panel down the left edge, and the bar above the viewport
the bar above the viewport; the developer panel is kept, on purpose
The dev panel, uncropped
This is the 16:46 frame, uncropped. The panel on the left is the simulation’s actual inputs: time of day, sea state, wind angle, crest sharpness, seed. New seed, new ocean, same rules.
Fallowmere · level 30 · dusk
A voxel MMORPG, shipped. Fallowmere at dusk, level 30, nine thousand fame in. World state, quests and loot all live on the realm server - the browser just renders it.
A voxel MMORPG that runs in a browser tab. I designed it, built it, and put it in production on Fly.io, where a web tier and a separate realm service keep one world consistent for everyone in it.
Technical notes
Status
Live, no install
Shape
Web tier plus realm service
Realm cap
64 players in one realm
Transport
Colyseus rooms over WebSocket
Renderer
three.js in the browser tab
Host
Fly.io
World
Seven regions, harder as you travel outward
Classes
Unlocked by beast lore and study, not a skill tree
This frame is two of us in the same Hearthvale from two browsers, and a realm holds up to 64 at once. Everyone in it is simulated by the same server, which was the hard part. Capture on this page · 6 Aug 2026 Project configuration
ribbon · 620k particles · 97 fps
A field that listens. Ribbon style at 1.6x sensitivity, 620k particles, 97 fps. Captured against Pink Floyd, four minutes in.
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murmuration-lead-ribbon.webp
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murmuration-ribbon-violet.png · 1,999 × 1,254
File dated
2026-08-27
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the transport and readout pinned along the bottom of the browser window
A million grains of light pushed through a curl-noise flow field in a WebGPU compute shader, then drawn as velocity-stretched additive sprites. Play it anything - the bundled track, a file you drop on it, or your microphone.
The part I care about is that it is listening rather than reacting. Loudness is easy and it is what most visualisers use. This works out the key and whether the piece is major or minor, the tempo, where the transients are, whether a band is being struck or held, and - the one I am most pleased with - where the music stops to breathe.
Mode, style, sensitivity, quality and frame rate along the bottom are live controls, not captions. B cycles the render mode, V the style, and the minus and equals keys scale how hard the music drives the field.
Ambient app. Japanese for a sunny spot, the pool of light you stand in.
My role
The offline bake, the runtime reprojection, the delivery.
Hard part
Photoreal light on hardware that cannot path-trace a frame of it. Cycles bakes offline, the browser reprojects.
Proof
116 frames per second live. Developer measurement
A calm ambient app: one autumn canopy path at golden hour, still enough to leave open on a second monitor. It holds 116 frames per second on hardware that could not path-trace a single frame of it.
None of the lighting is computed live. The frames are rendered offline in Blender Cycles and reprojected against a depth pass, so the camera gets real parallax through pre-lit plates - the browser is compositing photographs of a place that doesn’t exist. It’s not public yet; I want the audio right first.
0
1
2
3
Depth pass, 4 to 300 m
Backing plate, 3.4×
Running, at maximum lean
0Backing plate35 to 260 m
1Background trees15 to 63 m
2Midground arch5.5 to 22 m
3Foreground18% of the frame
One frame of hidamari in the four plates it is composited from, their four depth passes, and the same scene alive in the browser. The distances are hidamari’s own, taken over the whole plate rather than this window, and the greys run on one log scale from 4 to 300 metres across all four. Nothing in the finished frame was lit by the browser. What the browser does is move the camera through it.Technical notes
Status
Not public
Lighting
Baked offline, Blender Cycles
Runtime
Depth reprojection, 116 fps
Delivery
PWA, service worker, AVIF with PNG fallback
Audio
Layered ambience, LUFS calibrated
A sim core that ignores the browser
Greybox05 · Architecture
Elderwood Vale
Browser-native tower defense. Playable greybox, and an architecture argument.
My role
The sim core, the renderer, the HUD, and the boundary between them.
Hard part
Keeping the simulation away from everything that draws it, with the compiler enforcing that rather than me.
Proof
Playable greybox: placement, waves, enough economy to lose. Capture on this page · 6 Aug 2026
A browser-native tower defense. The part that’s done is the part I care about: the simulation is fully separated from everything that draws it.
The sim can’t touch the DOM, import three.js, read the clock, or call Math.random - and that’s enforced by the compiler and the linter, not by me remembering.
Technical notes
Status
Playable greybox: placement, waves, enough economy to lose
Sim
Fixed 1/30 s tick, snapshot interpolation
Render
three.js, free of the tick rate
HUD
React, subscribed at 10 Hz
Boundary
DOM lib removed from tsconfig, ESLint restricted paths
Voxel tower defense. Ten maps, 249 authored waves, and three boards that each break a rule the other nine keep.
My role
All of it: the voxel modeler, the fixed-step sim, ten maps, 249 waves, the balance.
Hard part
Shipping a game this size with almost nothing to download. Every model is colored boxes placed in code, every sound is synthesized the moment it plays, every icon is a hand-drawn SVG.
Proof
Playable right now: ten maps, three difficulties, three heroes, an endless mode with saved records. Capture on this page · 27 Aug 2026 Project configuration
Elderwood Vale, one row up, is a tower defense as an architecture argument. This is the one that shipped. Ten maps and 249 authored waves, and under them four tower families that go three levels deep, split into two elite branches, and end in two different tier-5 crowns - so the branch you pick decides how the map ends. Plus road traps, a shard economy that overcharges and ascends towers, Veiltide surges under a violet sky, three heroes taking A* move orders, and an endless mode 200 waves deep with a record to chase.
The last three boards are past the finale, and each one breaks a rule the other nine keep. Sunderfall Terraces runs four roads at four heights, and a tower shoots from its own footing, so a ridge above you blocks the shot. Emberwind Reach sets a firestorm that follows your hero: lead it into the horde and it burns him too. Tidereach Causeway closes causeways and opens others mid-battle, and the traffic reroutes onto whatever is still standing, so the defense you paid for is not the one you keep.
Almost none of it is a file. Every model is colored voxel boxes placed in code, every sound is synthesized by WebAudio the moment it plays, and every symbol in the UI is a hand-drawn SVG. The deliberate exception is the painted art on the menus - map cards, heroes, bosses, a title screen - because a campaign screen wants a picture of the place, and a box cannot be one.
Built this August, working with agents - one writing under direction, one reviewing adversarially. Six rounds of that against the code, then a three-round design review where both models wrote independently and then attacked each other. Every report is committed next to the source.
2048, cubed: slide and merge inside a 3×3×3 cube, across six directions instead of four.
My role
The whole file: engine, renderer, input, synthesized sound.
Hard part
Making six directions feel obvious. Swipes are scored against how each axis actually projects on screen, so a swipe along a lattice edge does what it looks like.
Proof
One self-contained 553 KB HTML file, 62 tests. Developer measurement Project configuration
It’s 2048 with a third axis: twenty-seven cells, six slide directions, the same merge rule. The axis you can’t see is the one that kills you, so tiles blocking your view of other tiles go translucent, and holding Space spreads the layers apart to let you read the inside of the board.
Vanilla JS with a vendored three.js, bundled into a single HTML file you could attach to an email. The input got the most iteration: swipes are matched to the on-screen projection of all six directions, and on a phone you can lean the device a capped twelve degrees to peek around the cube, without changing what any swipe means.
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cubit-inset-board.webp
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2,000 × 1,125 · 65 kB
Capture
cubit-board-xray.png · 2,560 × 1,440
File dated
2026-08-20
Cut away
Nothing. The frame is whole.
Technical notes
Status
Live, saves locally
Board
3×3×3, six slide directions
Bundle
One HTML file, 553 KB, nothing external
Input
Swipes scored against screen-space axis projections
I did two degrees at once, computer science and astrophysics, because I couldn’t choose between them. Some weeks that meant Algorithms and General Relativity in the same problem-set pile.
In college I simulated CO2 cooling for particle detectors. Now I simulate an ocean for a sailing game.
01
Off the clock
Heirloom tomatoes, bikes, and Pink Floyd, roughly in that order.
02
Long held
Wanted to be an astronaut since I was four. Still would.
03
Will debate
Python is the best language. I’ve heard the counterarguments. File an appeal
04
Best class
Cosmology and Consciousness. An independent study, and I had to ask for it.
I read it, and I answer it. Send me a hard systems problem, an overambitious browser idea,
or a reason Python isn’t the best language. Email is the fastest way in.
