Aditya Gupta

Selected Work

Production-grade systems and open-source tooling.

Linkly

Enterprise-Grade Creator Identity & Analytics Platform

Engineered from the ground up to survive unpredictable viral traffic surges. Moves beyond traditional CRUD boundaries by utilizing an event-driven architecture that decouples heavy analytics writes from the critical read-path, ensuring sub-millisecond latencies.

Event-Driven Analytics via Redis Streams

To prevent database locking during traffic spikes, click events are instantly published to Redis Streams. A background consumer asynchronously processes heavy IP-geolocation lookups and batch-inserts them into PostgreSQL.

High-Availability Cache Fallbacks

Extensively leverages Upstash Redis for sub-millisecond RAM reads with @CacheEvict invalidation. Implements robust circuit-breaker fallbacks to PostgreSQL if the Redis cluster drops, ensuring true high-availability.

Cross-Origin Security & Rate Limiting

Secured via stateless JWTs immune to XSS via HttpOnly, SameSite=Lax cookies. Employs Bucket4j for dynamic IP-based Rate Limiting to drop malicious requests in <1ms and mitigate DDoS attacks.

Automated Observability & Keep-Alive

Features a custom distributed Keep-Alive system via @Scheduled tasks to prevent serverless cold-starts. Fortified by Spring Boot Actuator for live health metrics and strictly tested via JUnit 5 & Mockito.

Java 21 Spring Boot 3 Redis Streams PostgreSQL Bucket4j React 18

Resilient Checkout API

Fault-Tolerant Distributed Checkout Engine

A battle-tested order processing API engineered to systematically solve four major industry failure scenarios: The Double Charge, The Race Condition (overselling), The Gateway Outage, and The Partial Failure.

Idempotency (The Double Charge)

Strictly enforces unique Idempotency-Key headers backed by PostgreSQL UNIQUE constraints. Safely rejects duplicate requests at the disk level to prevent double-charging impatient users during network retries.

Pessimistic Locking (The Race Condition)

Executes SELECT ... FOR UPDATE queries during inventory deduction to serialize concurrent requests, mathematically guaranteeing stock is never oversold during high-concurrency race conditions.

Circuit Breakers (The Gateway Outage)

Wraps external payment gateway calls with Resilience4j. Dynamically trips the circuit OPEN during outages to instantly "fail fast", protecting the Tomcat thread pool from cascading exhaustion.

State Machine & Reconciliation (Partial Failure)

Decouples local database transactions from external network calls. A background cron job sweeps for stuck PAYMENT_PENDING orders and self-heals the database state based on gateway truth.

Java 21 Spring Boot 3.3 PostgreSQL 15 Resilience4j Idempotency Distributed Systems

MiniGit (mgit)

Educational Version Control System Built From Scratch

A miniature, fully functional version control system built entirely in Go. Designed to demonstrate the core architectural concepts behind tools like Git, featuring content-addressable storage, tree-based histories, and a 3-way merge algorithm.

Content-Addressable Storage

Replicates Git's internal object model by hashing file contents (SHA-1) into immutable blobs. Builds a verifiable directed acyclic graph (DAG) of cryptographic hashes for complete history tracking.

Intelligent 3-Way Merge

Running a merge command automatically locates the lowest common ancestor between branches and attempts a clean 3-way merge of disjoint changes, closely mirroring real Git internals.

Conflict Resolution & Resets

Halts merges upon detecting conflicts, generates standard conflict markers (<<<<<<< HEAD), and implements a full reset subsystem (--soft, --mixed, --hard) to rewrite history.

Reactive Embedded Web GUI

Features a zero-dependency React frontend compiled and embedded directly into the Go binary via //go:embed. The UI reactively polls the filesystem to reflect CLI actions in real-time.

Go (Golang) React VCS Internals Cryptographic Hashing DAG Data Structures

Other Notable Projects

Schedulo

Full-Stack Scheduling Platform

A Calendly clone featuring event-type management, configurable timezone support, and dynamic availability computation to prevent double-booking at the DB level.

Python FastAPI PostgreSQL React

Snip

Lightweight URL Shortening Microservice

A dependency-free microservice written in Go. Exposes a minimalistic REST API for URL shortening using MD5 hashing and in-memory O(1) lookups for fast redirects.

Go REST API Microservices

Auto_Mind

Intelligent Automotive Assistant

A Flask app combining an ML price-prediction model with a marketplace and messaging system. Supports multi-role authentication and an AI conversational assistant.

Python Flask scikit-learn SQLite

Mental Health Support App

AI-Integrated Medical Platform

Facilitates secure doctor-patient interactions with appointment booking. Integrates a fine-tuned RoBERTa transformer model for real-time emotion detection.

Python Flask PyTorch Transformers

Coding Profiles & Stats

Quantifiable problem-solving experience.

1,916

LeetCode Rating (Knight)

Top 4.2%

Global Rank (out of 883k)

458+

Problems Solved

2

Major Hackathons (Flipkart, Adobe)

Explore My Profiles

LeetCode GeeksforGeeks CodeChef Codolio

Expertise

Technologies and core concepts I work with.

Languages

Java Golang Python

Backend

Spring Boot Spring Security Spring Data JPA Hibernate REST APIs JWT Resilience4j Bucket4j JUnit 5 Mockito

Databases & Messaging

PostgreSQL MySQL MongoDB Redis (Upstash) Redis Streams

Core CS

Data Structures & Algorithms System Design OOP DBMS Operating Systems Computer Networks

Tools & Platforms

Git GitHub Docker Docker Compose Flyway Swagger / OpenAPI Postman VS Code

Education & Certifications

Foundational knowledge and continuous learning.

Certifications

Java Developer Certification

Infosys Springboard

Java SE 8 Features & Fundamentals