
Kousik Chandra
Verified Expert in Engineering
Software Development Developer
Kolkata, West Bengal, India
Toptal member since May 27, 2026
Full-stack Web and Mobile Developer with 5+ years of experience building scalable applications across web and mobile platforms. Skilled in MERN and PERN stacks, Python with Django, React Native, and Android. Experienced in developing end-to-end solutions, from UI to APIs and databases, with a strong focus on performance, clean code, and real-world problem-solving.
Portfolio
Experience
- Node.js - 5 years
- Python 3 - 5 years
- Software Development - 5 years
- React Native - 5 years
- React - 5 years
- WordPress - 5 years
- Web Development - 5 years
- Full-stack - 5 years
Preferred Environment
Windows, Android, Web Development, Website Optimization, CSS Animations, Coding, Software Development, C++
The most amazing...
...thing: I have helped businesses streamline their entire business processes, reducing their workload by 80% .
Work Experience
Full-stack Web and Mobile Developer
Freelancer
- Created a clinic management solution for a clinic, which helped them to streamline their business processes.
- Developed an inventory management application for a boutique.
- Developed an offline field management mobile application for a brand, which helped track their offline counters.
- Built a billing POS application for a retail client.
- Built an ERP solution for a retail client, which helped them to streamline their entire business processes.
- Created a CRM application for a real estate client, which helped them track their leads.
- Developed a help desk application for a logistics client, which helped them streamline their client queries.
- Developed a chatbot application for a clinic that helped them answer client queries.
Full-stack Web and Mobile Developer
Online Freelance Agency
- Developed a mobile application for an offline brand to track the efficiency of employees.
- Built a content management system (CMS) for a hair salon client.
- Built an electronic health record (EHR) system for a clinic to help them track their patients.
Experience
Clinic Management Solution
The system provides a smart dashboard where doctors can track appointments, cancellations, new patients, online vs. offline bookings, and analyze trends across 1, 3, 6, and 12 months. It also offers insights into patient demographics, symptoms, and most prescribed medicines, helping in data-driven decision-making. Built-in tools allow clinics to publish SEO-friendly blogs, services, and testimonials, along with instant practice notifications.
Built using the PERN stack (PostgreSQL, Express.js, React, Node.js), the platform is scalable, secure, and optimized for performance, enabling clinics to grow efficiently while delivering a better patient experience.
Halth and Wellness Supplement Store
Key features included:
Custom Shopify theme customization
Product catalog management and subscription-based purchasing
Mobile-responsive design for all devices
Optimized product pages with conversion-focused layouts
Secure checkout and payment integration
Customer reviews and trust-building elements
Performance and speed optimization
SEO-friendly structure to improve organic visibility
The project focused on creating a modern, high-converting online store that helps customers easily discover, understand, and purchase premium nutritional supplements while supporting the brand's long-term growth and customer retention goals.
WordPress Website for A Surgical Gastroenterology Specialist
Key features included:
• Custom WordPress design and development
• Mobile-responsive layout optimized for all devices
• Service pages showcasing treatments, procedures, and medical expertise
• Patient education content and blog integration
• Appointment booking and contact inquiry functionality
• Testimonial and trust-building sections
• SEO-friendly website architecture for improved search visibility
• Performance optimization for faster page load times
The project focused on creating a patient-centric digital experience that improves online visibility, builds trust with prospective patients, and helps generate appointment inquiries through organic search and digital marketing efforts.
Education
Master's Degree in Computer Science
Institute of Science Banaras Hindu University - Varanasi
Skills
Libraries/APIs
Node.js, React, REST APIs, Shopify API
Tools
Shopify Plus
Languages
JavaScript, Python 3, HTML5, C++, Python, TypeScript, Shopify Liquid
Frameworks
React Native, Express.js, Tailwind CSS
Paradigms
Search Engine Optimization (SEO), API Architecture, Responsive Web Design (RWD)
Platforms
Android, WordPress, Windows, Amazon Web Services (AWS), Shopify
Storage
PostgreSQL, JSON, MongoDB, SQL Performance
Industry Expertise
Web Design
Other
Software Development, Web App Deployment, RESTFul APIs, Web Development, Website Optimization, CSS Animations, Coding, Back-end, Full-stack, API Integration, Technical Design, Shopify Customizations, API Design, API Testing, OpenID Connect (OIDC), Machine Learning, Elementor Pro, Query Optimization, Large Language Models (LLMs), AI Model Training, Code Review, AI Modeling, Debugging, eCommerce, Third-party Integration, Shopify SEO, Product Management, Shopify Theme
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