Need an Android app, a Rust backend, or real security done right?

I take on focused builds where the technical bar is high — production Android apps, Rust backends, and applied cryptography. I ship at quality, I'm honest about scope, and I document what I hand over. Student rates, senior-level care.

What I can build for you

Android apps

Production Kotlin / Jetpack Compose apps — not prototypes. MVVM, Hilt, offline-first Room, and the platform depth most apps skip.

Compose UI, custom Canvas & animation
Foreground services, WorkManager, widgets
In-app review/update, Firebase, Play Store release
Autofill, Credential Manager, biometrics

Rust backends

APIs and services built to hold up: framework-light, well-tested, and honest about their failure modes.

Axum / sqlx / PostgreSQL (or Go stdlib)
Auth, rate limiting, background workers
Payments (Razorpay HMAC), webhooks
Dockerized, deployable to Cloud Run

Security & crypto

Applied cryptography and security reviews — the area I go deepest. Real primitives, no hand-rolled crypto.

Post-quantum (ML-KEM / ML-DSA) integration
Zero-knowledge proofs (Circom), E2E encryption
Auth / authorization hardening & IDOR review
Threat modelling with documented limits

How it works

Tell me the brief

Send what you're building, roughly when, and any budget in mind.

Scope & quote

I reply with a concrete plan, milestones, and an honest estimate.

Build in the open

Small commits, working previews, and a repo you can watch.

Handover

Documented, tested, deployable. No mystery code left behind.

Start a project

Tell me what you need.

The more concrete the brief, the faster and better the quote. I usually reply within a day.

rudreshrajvansh@gmail.com

GitHub ↗ LinkedIn ↗