🚀 Backend Engineer • SaaS Systems

Hi, I'm Himanshi Prajapati

I build scalable backend systems, optimize databases, and design high-performance APIs powering real-world SaaS platforms.

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275+

DSA Problems

3+

Major Projects

2+

Internships

About Me

I'm a backend-focused software engineer specializing in building scalable APIs, optimizing database performance, and designing robust system architectures. I work extensively with Node.js, Express, PostgreSQL, MySQL, and Redis to power real-world SaaS platforms.

My expertise includes multi-tenant systems, authentication flows, query optimization, and high-performance backend design — ensuring systems are reliable, efficient, and production-ready.

275+

DSA Problems

8.8 CGPA

B.Tech

2+

Internships

⚡ Scalable Backend Systems

Designed and built scalable REST APIs for production SaaS applications.

🧠 Database Optimization

Optimized SQL queries, indexing strategies, and improved performance.

🚀 SaaS Architecture

Built multi-tenant systems with authentication and caching using Redis.

🔐 Security & Auth

Implemented JWT-based authentication and secure backend flows.

My Tech Stack

Technologies I use to build scalable backend systems

Backend

Node.js Express REST API TypeScript

Databases

PostgreSQL MySQL SQL Server

Caching

Redis Memory Cache

DevOps

Linux Docker CI/CD VPS

Backend Concepts & Expertise

REST APIs JWT Authentication Query Optimization Indexing Transactions Multi-Tenant Architecture System Design Caching Strategies

Backend Engineering Impact

Real-world backend capabilities demonstrated through production-level work

Scalable API Design

Designed modular and scalable REST APIs handling real-world SaaS workloads.

Query Optimization

Optimized SQL queries and indexing strategies to improve performance and reduce latency.

Redis Caching

Implemented caching strategies using Redis to significantly improve API response time.

Authentication Systems

Built secure authentication flows using JWT and role-based access control.

Multi-Tenant Architecture

Developed scalable multi-tenant backend systems for SaaS platforms.

High Performance Systems

Focused on performance tuning, reducing latency, and improving system efficiency.

Work Experience

Building scalable backend systems, optimizing performance, and delivering production-ready SaaS solutions.

Freelance Backend Engineer

Restaurant SaaS Platform

2024 – Present
Node.js Express PostgreSQL Redis Multi-Tenant

What I Built

  • • Menu Management System
  • • Offers & Promotions Engine
  • • Driver Management Module

Impact

  • • Scalable REST API architecture
  • • Reduced latency using Redis caching
  • • Designed production-ready backend

Cryptography Intern

DRDO • Ministry of Defence

2024
Python RC4 ChaCha20 Tkinter

Work

  • • Built encryption/decryption systems
  • • Developed GUI-based crypto tool

Impact

  • • Improved key stream efficiency by 30%
  • • Enhanced usability via GUI

Software Developer Intern

Presence Learning Pvt. Ltd.

2022
PHP SQL Server JavaScript

Work

  • • Backend workflows for 2000+ users
  • • Built dashboards & analytics

Impact

  • • Reduced load time by 70%
  • • Handled 6000+ monthly requests

Featured Projects

Real-world systems, machine learning apps, and backend architectures

NextSale

ML forecasting web app for predicting e-commerce sales trends.

Flask Angular Prophet ML
View Details →

UAV Intrusion Detection

Lightweight IDS for UAV networks with ML optimization.

Python Scikit-learn Optuna
View Details →

Online Voting System

Secure voting platform with authentication and encryption.

PHP MySQL Security
View Details →

Backend Execution Engine

Real-time simulation of request processing inside a backend system

REQUEST 

      


      
      

        

          EXECUTION FLOW
        



POST /api/auth/login

→ AuthController.login()

→ AuthService.validateUser()

→ DB Query (users table)

→ Return JWT Token



      


      
      

        

          RESPONSE
        

        

      


    


  









  


    
    

      

        Backend 
        
          Architecture
        
      

      

        High-level system design for scalable backend applications
      

    


    
    


      
      

        
        
Client

      


      
      


      
      

        
        
API Server

        (Node.js / Express)
      


      
      


      
      

        
        
Redis Cache

      


      
      


      
      

        
        
Database

        (PostgreSQL / MySQL)
      


    


  









  


    
    

      Let’s Build Something 
      
        Powerful
      
    


    

      I'm always open to working on scalable backend systems, SaaS platforms, 
      and performance-driven applications.
    


    
    


      
      
        
        
Email

        
phimanshi379@gmail.com

      

      
      
        
        
Phone

        
+91 9569968742

      

      
      
        
        
GitHub

        
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