Labs

Scan QR codes and barcodes, create your own, and keep them organized on your phone.

• Scan with the camera or read codes from images and PDFs.
• Create and style QR codes and common barcodes.
• Save codes, drafts, and favorites on your phone.

An Android sky map with camera guidance and alarms for sky events. Find stars, planets, and constellations on a 360° map, then use your phone’s camera to locate them in the sky.

• Find celestial objects with live camera guidance.
• Set alarms for sunrise, moonrise, and other sky events.
• Explore dates and locations with offline core calculations.

Estimate materials and costs from saved room and wall measurements. Built for homeowners, contractors, and designers, with calculations for paint, tiles, brickwork, concrete, and rebar.

• Reuse measured room and wall layouts across estimates.
• Work with 30+ calculators and editable material and labor rates.
• Keep the Android workspace offline, without an account.

An independent publication about forgotten apps, short-lived fads, and internet obsessions in India. Each story looks back at what caught on and what happened afterward.

• Read about apps, fads, and cultural crazes in India.
• Follow source links for more context.
• Browse stories about trends that have faded.

Read and edit Markdown with live preview, tabs, mathematical notation, and Mermaid diagrams.

• Edit with a live preview, math, and Mermaid diagrams.
• Work across tabs with drafts and saved reading positions.
• Open local files or public Markdown URLs.

A browser playground for HTTP requests, WebSocket connections, and understanding an API.

• Compose HTTP requests and exchange WebSocket messages.
• Keep requests, environments, and history in a local workspace.
• Generate cURL, Fetch, or Axios code from a request.

An Android app for students at Indira Gandhi National Open University, with academic information, answers to queries, and news. It reached the top spot on Google Play within 120 days and served over 300,000 active students before development paused in May 2018.

• Brought academic updates and guidance into an Android app.
• Reached more than 300,000 active students.
• Development paused in May 2018.

A 10 MB Android app with more than 150,000 quotes. Browse by category, search, save favorites, download quotes, listen to them, or share them. It also supports gesture controls.

• Search more than 150,000 quotes across categories.
• Save favorites, download, listen, and share.
• Packaged as a compact 10 MB Android app.

A blockchain project where nodes create, sign, verify, broadcast, pool, and mine transactions. It uses secp256k1 signatures, SHA-256 hashing, and dynamic mining difficulty.

• Follow transactions from signing and verification to mining.
• Explore secp256k1 signatures and SHA-256 hashing.
• Study dynamic mining difficulty across participating nodes.

A spot and derivatives trading platform I built at Efficacious Solutions Private Limited. It uses more than 20 microservices, horizontal scaling, distributed caching, and fault-tolerant services.

• Designed and developed the exchange from scratch.
• Connected transaction processing with distributed caching and messaging.
• Built for use as a production trading platform.

An open-source order matching engine written in C#. It handles a range of order types and runs across platforms.

• Supports a range of order types.
• Written in C# for use across platforms.
• Source code is available on GitHub.

A food marketplace I built as an IGNOU college project. Sellers could register and publish menus; customers could place orders, leave feedback, and request refunds.

• Let sellers register and publish their menus.
• Connect ordering with feedback and refund claims.
• An IGNOU college project exploring a food marketplace.