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krahulsahu/README.md

๐Ÿš€ Rahul Kumar

Backend Software Engineer | Enterprise Java โ€ข Spring Boot โ€ข Node.js โ€ข Distributed Systems

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๐Ÿ’ป Building robust, scalable, and secure backend architectures with production-grade business logic.


๐Ÿง‘โ€๐Ÿ’ป Professional Summary

โšก I am a backend-focused Software Engineer specializing in building scalable enterprise systems, transactional workflows, and distributed microservices. I design robust backend architectures, secure REST APIs, and automated data pipelines using Java / Spring Boot and Node.js.

๐Ÿ›ก๏ธ Experienced in implementing enterprise-grade security (RBAC, JWT), event-driven microservices (Kafka), high-performance caching (Redis), and containerized deployments (Docker, CI/CD, Azure). Backed by a strong algorithmic foundation with 600+ DSA problems solved in Java.


๐Ÿ› ๏ธ Tech Stack & Ecosystem

๐Ÿ’ป Programming & Backend

  • โ˜• Languages: Java (SE/EE), JavaScript (ES6+), SQL
  • โš™๏ธ Frameworks: Spring Boot, Spring Security, Express.js, Node.js
  • ๐ŸŒ Architecture: RESTful APIs, Microservices, Event-Driven Architecture

โš™๏ธ DevOps & Databases

  • ๐Ÿ—„๏ธ Databases: PostgreSQL, MySQL, MongoDB, Redis (Caching)
  • ๐Ÿณ Cloud & DevOps: Docker, Kubernetes (Basics), Azure, GitHub Actions
  • ๐Ÿ› ๏ธ Tools: Nginx, Git/GitHub, Postman, JUnit, Maven

๐Ÿ’ผ Professional Experience

๐Ÿข Nexucon โ€” Associate Software Developer

Enterprise Accounting & Financial Systems | Node.js โ€ข Express โ€ข PostgreSQL โ€ข Docker โ€ข Azure

  • โšก Bulk Data Pipelines: Engineered a robust, transactional Excel bulk upload pipeline featuring asynchronous parsing, schema validation, and preview-before-commit capabilities, drastically reducing incorrect database writes.
  • ๐Ÿ’ธ Financial Workflows: Designed and implemented critical modules for an enterprise accounting suite, including Purchase Order (PO) management, Multi-Item Ledger transactions, and Bank Reconciliation matching logic.
  • ๐Ÿ›ก๏ธ Compliance & Taxation: Programmed complex GST and HSN-based tax calculation engines supporting multi-tiered and multi-regional taxation rules.
  • ๐Ÿ” Security & Auth: Configured secure API routes using Role-Based Access Control (RBAC) and JWT validation for distinct organizational profiles.
  • ๐Ÿณ Infrastructure & CI/CD: Maintained Docker container deployments and collaborated on CI/CD workflows using GitHub Actions targetting Microsoft Azure.

๐Ÿข Organizational Contribution Activity

Worked extensively on enterprise private repositories during professional experience (2025โ€“2026).

Contributions 2026 Contributions 2025

๐Ÿ’ผ Contributions include enterprise backend development, accounting systems, invoice processing, GST workflows, RBAC systems, reconciliation modules, and production-grade REST APIs.


๐Ÿ† Featured Projects

๐Ÿฅ CareVita โ€” Multi-Tenant Healthcare Ecosystem

Role-Based Medical Service Platform | Node.js โ€ข Express.js โ€ข MongoDB โ€ข Socket.io โ€ข Cloudinary

  • ๐Ÿฉบ Core Engine: Engineered a secure medical platform supporting RBAC (Admin, Doctor, Patient flows) and OTP-based authentication.
  • ๐Ÿ’ฌ Real-time Comms: Developed real-time clinic communication channels and doctor-patient chat using Socket.io.
  • โ˜๏ธ Secure Media: Integrated secure Cloudinary media upload pipelines with server-side payload validation.

๐Ÿ”— View CareVita Repository


๐Ÿ’ณ Enterprise Financial & Bank Reconciliation Module

Automated Reconciliation & Audit Trail | Java โ€ข Spring Boot โ€ข MySQL โ€ข Redis โ€ข Docker

  • ๐Ÿ”„ Matching Algorithm: Designed an automated reconciliation engine that matches bank statements against ledgers based on multi-parameter fuzzy logic.
  • โšก Performance Tuning: Implemented Redis caching for high-frequency financial lookups, improving transaction verification speeds by 60%.
  • ๐Ÿ“ Audit Trail: Built detailed audit logs and transaction history reporting utilizing event-driven updates.

๐ŸŽจ AI-Powered Image Synthesis Portal

SaaS Platform with Credit-Based Billing | React.js โ€ข Node.js โ€ข Express.js โ€ข MongoDB โ€ข Redis

  • ๐Ÿช™ Rate Limiting & SaaS Flow: Developed a full-stack dashboard utilizing text-to-image AI generations with built-in credit validation.
  • โšก Cache Management: Used Redis to optimize API call rates and store active session states.

๐Ÿ“ˆ Algorithmic & Coding Statistics

๐Ÿง  DSA Mastery: Solved 600+ problems across LeetCode and GeeksforGeeks using Java.

Proficient in Trees, Graphs, HashTables, Tries, Dynamic Programming, Greedy, and time/space complexity optimization.


๐Ÿ“Š GitHub Analytics & Technical Proficiency

Rahul's GitHub Stats GitHub Streak

๐Ÿ› ๏ธ Language & Core Skill Index

Java
NodeJS
SQL
NoSQL
DevOps


๐Ÿ’ก Developer Mindset

"I write backend systems engineered for durability, data integrity, and strict business compliance. Scalable architecture is not about avoiding complexity, but structuring it cleanly."

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