Rajiv Ranjan

Python Backend Developer with 4+ years of experience building scalable REST APIs, cloud-based applications, and secure backend systems using Python, Django, Flask, and FastAPI. Experienced in AWS, Docker, Kubernetes, PostgreSQL, API integrations, and security-focused development. Worked on cloud security, fintech, AI-based applications, and enterprise mobility solutions with strong expertise in backend architecture, debugging, and production support.

Lead Python AWS Developer - Persistent Systems

(2025-07)

• Developed and maintained Data Connector for cloud security platforms
• Optimized cloud resource utilization, improving system efficiency and reducing infrastructure costs
• Enhanced platform security through authentication, authorization, and access control improvements
• Managed end-to-end PR lifecycle, including code reviews, testing, and release validation for reliable deployments
• Resolved production incidents using Grafana monitoring, root cause analysis (RCA), and system performance optimization
• Built security parsers compliant with CPS and ECS standards using regex-based event categorization and log processing
• Worked with microservices architecture, API integration/testing, log analysis, and CAB-based change management processes

Python Full Stack Developer - Dinjan AI

(2025-01 - 2025-06)

• Built scalable backend services using Python and Django REST Framework
• Collaborated with frontend teams to improve API usability and application performance
• Handled authentication, authorization, and security enhancements for the platform
• Designed and optimized APIs for seamless integration with frontend and third-party services
• Integrated Razorpay and PayPal for subscription-based payment processing to handle subscription-based services and transactions

Foundation AI Implementation Developer - Dinjan AI

(2024-02 - 2024-12)

As an Implementation Developer, I implemented and customized configurations based on client requirements using Python scripting and PostgreSQL. Additionally, I integrated both required APIs and third-party APIs to enhance functionality and meet project specifications.

Python Developer - Sujanix Pvt Ltd

(2022-06 - 2024-02)

As a Backend Developer, I managed:

• User authentication and authorization, including data encryption
• Integration of third-party APIs for enhanced functionality
• Developed RESTful APIs for Enterprise Mobility Management
• Implemented OAuth and API key-based access for security
• Ensured robust error handling for improved user experience

B.Tech - CSE - Maulana Abdul Kalam Azad University, West Bengal (2016 - 2020)