The home for
Sarthak's work.

I design and build products. Since 2018 that's meant bootstrapping my own ventures in design, AI and growth, and writing here about what works and what doesn't. Learn more about me

If you need a hand, I build brand-specific design systems and migrate sites from no-code builders to code you own. See services

Let's work together

Ventures.

Services I offer.

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Coral hands arranging paper wireframes and desktop and mobile landing-page designs on a navy desk.
Starting from $750

SaaS landing page design and build

One SaaS landing page, from the first wireframe to launch. I handle the design and build for a fixed price.

Coral, lavender and amber interface tiles connecting along curved node paths into a structured browser window with a bar chart, toggle and cursor on a cobalt-blue grid.
Starting from $500

Product UI Sprints for SaaS workflows and React apps

A focused sprint to redesign or implement one SaaS workflow in Figma, React, or both, using the components your product already has.

A hand pressing a purple button on a mint interface panel with three golden-orange cards, on a peach background.
Starting from $1,000

Design Systems built for your brand and your AI tools

A brand-specific React and shadcn/ui library with tokens, custom components, lint rules and agent tooling, so every new screen looks like it belongs.

An illustrated laptop beside a coffee mug with curling steam, a notebook, pen, and sticky note on a citron background.
Starting from $100

Website Migrations from Framer, Webflow, and more

A faithful rebuild of your existing marketing site in Astro, Next.js or TanStack Start, with CMS integration included.

Featured work.

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Illustrated desk calendar showing a sunny day, with curling ribbon, pencil, and paperclip.

My Next Filing - A Tax Plan for Freelancers in India

A browser-only tax planner for solo freelancers in India. Answer a few questions and get your next action, its due date, and what you still owe.

Browser screenshot of Engage360 activity dashboard with revenue charts, invoice metrics, and a new leads table.

UX-Folio - Design Explorations & Experiments

A collection of interesting design work, hackathon projects, and experimental interfaces created during my time at Drool agency.

Angled collage of grayscale app onboarding screens with lime-green buttons, profile photos, payment forms, and filters.

My Drip - AI-Powered Personalized Shopping Experience

An innovative MVP that combines generative AI with personalized eCommerce, delivering daily outfit recommendations with realistic photos of users wearing them.

Desktop and mobile website mockups for Phidata, promoting AI app building with blue gradient waves.

Phidata - AI Assistant Platform Landing Page

A comprehensive landing page redesign for an innovative AI assistant platform, focusing on clear communication and conversion optimization.

Recent posts.

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Hands guide three sequential interface cards from image selection to a completed checkmark.

How Dropbox, DoorDash, Airbnb and Stripe designed their MVPs

Early UI and founder stories from Dropbox, DoorDash, Airbnb, Stripe, Zapier, and Product Hunt. What to design first, reuse, and leave for later.

Illustrated hands frame a floating video player with play button against an abstract purple background.

Adaptive video with FFmpeg, Vite and a custom player

How I turn recordings into cached AV1 and H.264 streams with FFmpeg and Vite, then play them with native HLS or Mattebox behind custom React controls.

Gold coins and a clock spiral into a deep blue vortex.

How to scope a SaaS project you can afford to finish

How I approach SaaS scope and pricing as a former agency owner and current freelancer, and what to ask when budgeting for design and development.

Colorful illustration of a central palm tree icon surrounded by charts, interface controls, and hands.

Optimizing the sh*t out of TanStack Start

A practical TanStack Start performance guide: how cutting downloads and fixing fonts and images took my home page from 73 to 100 on mobile Lighthouse.