Everything I’ve built. The label on each is the kind of problem, not the stack.
Product engineering
A drag-and-drop form builder in a Turborepo monorepo, with end-to-end tRPC type safety, shared Zod schemas, server-validated conditional logic, funnel analytics and custom JWT auth.
canvas
rule
show Seats when Plan is team
the server checks it again on submit
Retrieval
A RAG assistant over course subtitles that cites the exact module, lesson and timestamp. 1,955 transcript chunks indexed with local embeddings to stay off the rate limits, then HyDE to bridge spoken phrasing and LLM reranking of up to 10 candidates down to 5.
asked
why does my effect run twice?
answer
In development Strict Mode mounts, unmounts and mounts each component again, so a cleanup you forgot shows up at once.
Module 3 · Lesson 12 · 14:32
+ 4 more passages cited
Applied AI & domain modelling
Reconciles Razorpay settlement GST against GSTR-2B in four layers: detect, investigate, explain, act. Arithmetic produces every figure and an MCP tool-calling loop classifies what is left over. Any answer citing a record absent from the batch is flagged on screen before a person confirms it.
settlement · 31 Jul
fee ₹20.00 + GST ₹3.60
gstr-2b · jul 2026
no matching ITC
gstr-2b · aug 2026
ITC ₹3.60
gap · timing
fee settled in July, billed in August’s 2B
→ draft: GSTR-3B flag, claim in Aug
Identity & protocols
A self-hosted OpenID Connect provider built from scratch: Authorization Code flow with PKCE, SSO session cookies, RS256 signing and JWKS-based verification. Reading the spec was most of the work.
eyJhbGciOiJSUzI1NiIsImtpZCI6ImsxIn0.eyJpc3MiOiJodHRwczovL2N1c3RvbS1vaWRjLXByb3ZpZGVyLm9ucmVuZGVyLmNvbSIsInN1YiI6InByZWV0IiwiYXVkIjoicG9ydGZvbGlvIiwiZXhwIjoxNzg5MDAwMDAwfQ.Qm9vdHN0cmFwcGVkIGZyb20gdGhlIHNwZWMsIG5vdCBhIGxpYnJhcnk
header
{ "alg": "RS256", "kid": "k1" }payload
{ "iss": "https://custom-oidc-provider.onrender.com",
"sub": "preet",
"aud": "portfolio",
"exp": 1789000000 }signature
RS256 · checked against JWKS ✓
Concurrency & correctness
Movie ticket booking with atomic seat reservation, so two people clicking the same seat at the same moment cannot both get it. 1st place, ChaiCode hackathon.
screen
C4 · A holds the lock
B · 409 seat already held
Compilers & tooling
A browser-native, utility-first CSS engine that parses class names and generates the styles at runtime, with no build step anywhere. 1st place, ChaiCode hackathon.
in
<div class="p-4 rounded-lg bg-slate-900 hover:bg-slate-800">
out · at runtime
.p-4 { padding: 1rem }
.rounded-lg { border-radius: .5rem }
.bg-slate-900 { background: #0f172a }
.hover\:bg-slate-800:hover { background: #1e293b }
no build step · 4 rules
Event streaming
Signed-in users share a location and watch each other move on a map. Socket.io feeds a Kafka topic, one consumer group broadcasts and another persists, so writing the history never blocks the live fan-out. Sign-in runs through my own OIDC provider.