Full Stack Developer

Building Scalable Backend Systems

I'm Praveen Singh, full stack engineer specializing in Flutter,ReactnativeNode.js microservices, payment systems, and high-performance applications.

3+ Years

1M+ Installs

50K+ Transactions/mo

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About Me

I'm full stack engineer with over 3 years of experience building scalable systems that power millions of users.

My expertise lies in designing and implementing microservices architectures, payment systems, and real-time applications. I've built shared backend services used across 5+ production apps, supporting 1M+ installs, 300K+ MAU, and processing 40K+ daily transactions.

I focus on writing clean, maintainable code and creating systems that are both performant and reliable. My approach combines technical excellence with a deep understanding of business requirements.

                            99.9%
                            Payment Success Rate
                        

                            45%
                            API Throughput Improvement
                        

                            90%
                            Reduction in Manual Verification
                        

Backend & APIs

Node.js Express.js REST APIs Microservices

Databases

MySQL MongoDB Firestore DynamoDB

Cloud & DevOps

AWS Firebase Docker CI/CD

Real-Time & Payments

WebSockets Razorpay Cashfree HDFC Gateway

Experience

Jan 2024 – Present

Founding Engineer ( Full Stack)

Governance Matter India

Designed and built a centralized payment microservice (Node.js + REST) used across 5 different mobile applications, processing 50K+ transactions/month with 99.9% success rate
Architected a real-time chat backend using WebSockets for a dating platform supporting 300K+ MAU, increasing user engagement by 42%
Built scalable verification and onboarding services integrating Vahan, eKYC, IBB, CIBIL, reducing manual verification by 90%
Refactored backend services into async, non-blocking pipelines, improving API throughput by 45% while maintaining 98%+ uptime
Implemented caching and query optimizations, reducing average API latency by 38%

Node.js Microservices WebSockets Payment Gateways AWS

Jun 2023 – Dec 2023

Software Engineer (Full Stack)

Gully2Global

Built a flight booking backend system using Node.js + MySQL, handling 10K+ bookings/month
Integrated flight and payment APIs (Razorpay, PayU, Cashfree), improving checkout success rate by 18%
Deployed backend services on AWS, improving response times by 20%
Developed Flutter frontend features with backend-driven validation and consistency

Node.js MySQL Flutter AWS

Jan 2023 – Mar 2023

Development Intern

JookeBox

Developed REST-integrated Flutter features, improving screen load performance by 35%
Improved UI responsiveness and API handling for low-end devices

Flutter REST APIs

Featured Projects

Spinny-Style Vehicle Marketplace

Architected end-to-end backend for a used vehicle marketplace with modules for listings, inspections, pricing, bookings, and payments.

Implemented dynamic pricing and availability logic, improving vehicle conversion rate by 22%
Designed secure role-based access control (RBAC) for dealers, inspectors, and admins
Optimized search and listing queries using indexing and caching, reducing p95 latency by 41%

Node.js MySQL Redis AWS Flutter

Centralized Payment Microservice

Built a unified payment service used across 5 production apps, handling multiple payment gateways and ensuring high reliability.

Processing 50K+ transactions/month with 99.9% success rate
Integrated HDFC, Razorpay, Cashfree with automatic fallback mechanisms
Reduced payment failures by 32% through intelligent retry logic

Node.js Express MongoDB Payment APIs

Real-Time Chat System

Architected a WebSocket-based real-time chat backend for a dating platform supporting 300K+ monthly active users.

Increased user engagement by 42% with instant messaging
Implemented message queuing and delivery guarantees
Built scalable architecture handling thousands of concurrent connections

Node.js WebSockets Redis MongoDB

Get In Touch

I'm always interested in hearing about new opportunities, challenging projects, or just having a chat about backend architecture and scalable systems.

Email singhpraveenkumar975@gmail.com Phone +91-9403012499 LinkedIn linkedin.com/in/praveensingh9240

Location Banglore, India