Projects

Table of Contents

Walletora: E-Wallet
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TypeScript, Next.js, Node.js, Express.js, Turborepo, Docker, CI/CD, Postgres

Built monorepo using Turborepo with Next.js user app and Express.js webhook server
Implemented user authentication using NextAuth; developed balance tracking and peer-to-peer money transfer features
Integrated webhooks for real-time deposits from bank accounts to user wallets
Ensured ACID compliance using PostgreSQL transactions and row-level locking with ”FOR UPDATE” clause
Used Docker to containerize the apps and host images in Docker Hub
Created CI/CD pipelines with GitHub Actions for building and deploying Docker images to AWS EC2

C++, OpenSSL, Zlib, SQLite, CMake

Developed a Secure Multithreaded FTP Server where concurrent clients can: list, upload, download, rename and delete files
Used OpenSSL for secure file transfer using TLS protocol and used TCP optimizations to dynamically manage Nagle’s algorithm
Improved file transfer speed by 30% utilizing sendfile() zero-copy syscall and kernel-space data encryption using kTLS
Built a threadpool to handle concurrent clients efficiently, ensuring synchronization with locks and condition variables.
Created a secure user authentication system with OpenSSL’s PBKDF2 hashing for passwords and SQLite for database management.
Utilized Zlib’s Gzip for on-the-fly file compression/decompression and automated builds with CMake

TypeScript, Cloudflare Workers, Hono.js, PostgreSQL, Prisma, React, Tailwind

Developed a blogging platform with Sign Up/Log In functionality and Notion-style text editing using BlockNote (supports headings, images, lists, tables, and text formatting)
Created and deployed the backend on Cloudflare Workers using Hono for routing
Implemented Prisma Accelerate for connection pooling and Prisma ORM to manage data in a PostgreSQL database
Ensured secure authentication with JWT and password hashing using PBKDF2; validated inputs with Zod
Created responsive and optimal frontend using React and Tailwind

C, GNU Make, Syscalls, Compiler Design

Developed a custom UNIX shell capable of executing standard commands such as ls, echo, pwd, rm, cat, clear, etc
Designed and implemented a Lexer, Parser, Tokenizer, and Abstract Syntax Tree (AST) to process user inputs
Handled command execution using syscalls like execv, fork, and waitpid for process management

Java, Gradle

Created a CLI program based on OOPs principles using which users can book trains tickets from one destination to another
Features included: Sign up/Log in, Searching train according to source/destination, Booking tickets for seats of the selected train, Cancelling booking
Used Java8 features like: Stream API (to iterate easily and perform map/filter), Optional (to avoid NullPointerException)
Used Jackson ObjectMapper to serialize/deserialize data from/to JSON files where in-memory data about users and trains are stored, used Bcrypt to hash passwords and used Gradle as the build tool