Naveen Raja, Developer in Chennai, Tamil Nadu, India
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Naveen Raja

Verified Expert  in Engineering

Software Developer

Location
Chennai, Tamil Nadu, India
Toptal Member Since
October 25, 2022

Naveen is a full-stack developer and a certified Solutions Architect specializing in designing and building robust back-end systems and APIs. He is proficient in JavaScript, Python, Java, Groovy, Go, and SQL. He has vast experience in the payments industry and has developed several payment solutions. Besides his development expertise, Naveen is a great communicator who enjoys programming challenges and always looks forward to learning new technologies.

Back-end DevelopmentFull-stackBack-endSaaSPayment ProcessingWeb DevelopmentFront-endUser Experience (UX)User Interface (UI)MERN StackThird-party APIsBack-end PerformanceAmazon RDSWebhooksOAuth

Portfolio

Freelance Clients
Amazon Web Services (AWS), Docker, FastAPI, Gin-Gonic, Go, HTML, JavaScript...
Juspay Technologies Pvt
Groovy, Java, JavaScript, Grails, SQL, MySQL, Python, React, Apache Tomcat...
Juspay Technologies Pvt
Groovy, Java, JavaScript, Grails, SQL, MySQL, Python, React...

Experience

JavaScript - 7 yearsJava - 7 yearsNode.js - 7 yearsPython - 7 yearsReact - 6 yearsGroovy - 4 yearsGrails - 4 yearsKubernetes - 3 years

Availability

Part-time

Preferred Environment

Python, JavaScript, Java, Groovy, Grails, Node.js, React, FastAPI, Docker, Kubernetes

The most amazing...

...project I've developed is a one-stop payment solution for merchants called Express Checkout, which handles millions of transactions daily.

Work Experience

Senior Full-stack Developer

2020 - PRESENT
Freelance Clients
  • Designed and developed web applications through a variety of technologies for multiple clients.
  • Involved in architecting infrastructure of several applications.
  • Assisted with the development of APIs, UI, and application deployments.
Technologies: Amazon Web Services (AWS), Docker, FastAPI, Gin-Gonic, Go, HTML, JavaScript, Kubernetes, Node.js, NGINX, Python, React, Redux, Solidity, SQL, Elasticsearch, Next.js, NestJS, TypeScript, MUI (Material UI), NoSQL, Google Cloud Platform (GCP), MongoDB, MySQL, Django, gRPC, Automation, Stripe, Cron, Amazon Elastic Container Registry (ECR), Solution Architecture, Celery, Payment Processing

Senior Software Development Engineer

2018 - 2020
Juspay Technologies Pvt
  • Served as the lead developer of their main product, Express Checkout. It handles millions of payment transactions daily.
  • Designed and developed a single-click payment solution and several other payment flows.
  • Implemented new features, improved existing features, deployed code, and conducted code reviews, bug fixes, system maintenance, and customer support.
  • Involved in designing and developing scalable back-end APIs and other back-end features.
  • Assisted with several back-end and front-end development projects.
Technologies: Groovy, Java, JavaScript, Grails, SQL, MySQL, Python, React, Apache Tomcat, HTML, Spring, Hibernate, Amazon Web Services (AWS), Quartz, Node.js, Kubernetes, Docker, Redux, Automation, Cron, Solution Architecture, Payment Processing

Software Development Engineer

2017 - 2018
Juspay Technologies Pvt
  • Acted as the full-stack developer for their main product, Express Checkout. It handles millions of payment transactions daily.
  • Designed and developed several scalable REST APIs and improved existing APIs.
  • Involved in code deployments, code reviews, bug fixes, and customer support.
Technologies: Groovy, Java, JavaScript, Grails, SQL, MySQL, Python, React, Amazon Web Services (AWS), Apache Tomcat, Hibernate, HTML, Quartz, Redux, Spring, Automation, Cron, Solution Architecture, Payment Processing

Associate Software Development Engineer

2016 - 2017
Juspay Technologies Pvt
  • Served as the back-end developer for their main product, Express Checkout. It handles millions of payment transactions daily.
  • Assisted with the development of scalable back-end APIs, improving application performance.
  • Integrated 20+ payment gateways/aggregators into Express Checkout, thus elevating the product offerings.
  • Involved in customer support for Express Checkout, dealing with customer queries on both technical and business fronts.
Technologies: Groovy, Java, JavaScript, Grails, SQL, MySQL, Python, React, Apache Tomcat, Quartz, Amazon Web Services (AWS), HTML, Hibernate, Spring, Redux, Automation, Cron, Solution Architecture, Payment Processing

Express Checkout

https://developer.juspay.in/reference
A single API Interface for all the payment gateways. Merchants can choose from 100+ payment aggregators /payment gateways (PA/PGs) to process their online payments. Express Checkout, built with an intelligent routing system helps merchants efficiently route transactions based on Success Rates, Gateway health, and Business logic. Reduce operational costs, improve success rates and ensure 99.99% uptime.

Serving as the lead developer of the project, Express Checkout was written in Grails(Groovy) with a MySQL database and leverages several technologies like AWS, Redis, Nginx, Quartz, statsd, Kibana and Grafana. It was later rewritten in Node.js.

Card Locker

https://developer.juspay.in/docs/express-checkout-card-vault-merchants
A secure and isolated card vault that allows merchants to save their customers' card information and retrieve it for further transactions. I was involved in developing new features and maintaining the application.

It was written in Grails(Groovy) with a MySQL database and AWS for cloud infrastructure.

Prattle

https://github.com/naveenmraja/prattle.in
Prattle, which I designed and developed, is an anonymous chat application and a great way to meet new people. Prattle will pick someone random for a user and create a private chat session. The app will connect users with similar interests.

Prattle is built with MERN stack and uses several technologies like Redis, Docker, Kubernetes and NGINX.

CalTrack

https://github.com/naveenmraja/caltrack.tech
CalTrack, designed and developed by me, is a calorie-tracking app that lets you keep track of your daily food consumption. You can create a food entry for any date and edit and delete it anytime. CalTrack's dashboard provides useful insights into what the user consumes.

CalTrack was developed using MERN stack and uses technologies like Docker, Kubernetes and NGINX.

MySecrets

https://github.com/naveenmraja/mysecrets.tech
MySecrets, designed and developed by me, is a simple diary application that lets you record your memories. Users can create an entry for any date and edit and delete it anytime. MySecrets provides a dashboard to view and navigate all the entries.

MySecrets was developed in Node.js with React/Redux, AWS DynamoDB, NGINX, Docker and Kubernetes.

Express Checkout Demo

https://bitbucket.org/juspay/ec-demo
A demo project, designed and developed by me, that showcases all the client's product offerings. The project shows all the checkout modes. Users can complete end-to-end transactions depending on the payment gateways configured in their account.

Assets Dashboard

A simple dashboard application, designed and developed by me, to display assets owned by the user with a pie chart. Users can filter assets based on the asset type using the filter menu or by clicking on the pie chart segment.

This was developed using FastAPI(Python), React, and Redux.

Languages

Python, JavaScript, Java, Groovy, SQL, HTML, CSS3, HTML5, Python 3, CSS, ECMAScript (ES6), Go, TypeScript, Solidity

Frameworks

Grails, Redux, Spring, Hibernate, MUI (Material UI), Express.js, Spring Boot, OAuth 2, Bootstrap, gRPC, Flask, Gin-Gonic, NestJS, Next.js, Django

Libraries/APIs

Node.js, React, Socket.IO, Quartz, REST APIs, Amazon EC2 API, Sockets, Python API, React Router, React Redux, SQLAlchemy, API Development, Stripe

Tools

Amazon CloudFront CDN, NGINX, Apache Tomcat, Git, AWS Simple Notification Service (SNS), Docker Compose, Amazon Elastic Container Service (Amazon ECS), AWS IAM, Bitbucket, AWS ELB, AWS CLI, Google Kubernetes Engine (GKE), Google Analytics, PyCharm, Cron, Celery, AWS CodeDeploy, Amazon Elastic Container Registry (ECR)

Paradigms

REST, Socket Programming, Microservices, Test-driven Development (TDD), B2B, Unit Testing, API Architecture, Agile, Object-oriented Programming (OOP), Microservices Architecture, Back-end Architecture, Automation, DevOps

Platforms

Docker, Kubernetes, Linux, Google Cloud Platform (GCP), Amazon EC2, Amazon Web Services (AWS), Heroku

Storage

MySQL, Amazon DynamoDB, Redis, Amazon S3 (AWS S3), MongoDB, Google Cloud, NoSQL, Databases, RDBMS, PostgreSQL, Relational Databases, JSON, Elasticsearch

Other

FastAPI, Software Development, Amazon RDS, Web Development, Software Development Toolkits (SDK), APIs, Full-stack Development, Back-end Development, Amazon Route 53, Full-stack, Back-end, Payment APIs, Architecture, API Integration, SaaS, Fintech, Front-end, SDKs, AWS Auto Scaling, Software Architecture, Cloud, AWS Certified Solution Architect, AWS Cloud Architecture, Stock Trading, Stock Market, Web Applications, Front-end Development, User Experience (UX), MVC Frameworks, HTTP, User Interface (UI), Engineering, Webhooks, Pydantic, MERN Stack, Integration Testing, OAuth, Dashboards, Admin Panels, Third-party APIs, Back-end Performance, Payment Gateways, Solution Architecture, Payment Processing, ECS, CI/CD Pipelines

2012 - 2016

Bachelor's Degree in Information Technology

SSN College of Engineering - Chennai, India

JULY 2020 - JULY 2023

AWS Certified Solutions Architect – Professional

AWS