Senior Software Engineer building full-stack web applications, Zoho business automation, and AI-powered applications.
4+ years turning complex business requirements into production-grade systems, from B2B booking platforms to enterprise Zoho automation, now extending into AI/ML-enabled applications.
From full-stack development to business automation to AI-powered features: pick the track that fits your project, or combine all three.
End-to-end web applications with robust architecture: database design, frontend interfaces, API delivery, payment gateway and e-commerce integrations, accounting software sync, data cleaning and migration, and production deployment.
Complete business process automation on Zoho: from lead generation to finance, procurement, inventory, HR, and payroll, with custom application development on Zoho Creator, custom dashboards, and marketplace apps.
Extending a solid full-stack and API foundation into AI-powered features: intelligent automation, LLM-powered functionality, and data-driven tools built into production web apps.
Beyond the code: I know how these businesses actually run, day to day.
A sample of production systems built and integrations delivered.
APIs built with Django & DRF, integrating Amadeus Travel APIs for flight/hotel search, price checks, and booking confirmation. Handles the full booking lifecycle (search, booking, cancellation, status updates) with agent authentication, role-based access, and PNR/itinerary management.
Read Case Study →Phase-wise, project-wise, site-wise, and plot-wise budget tracking and forecasting. Integrated Salesforce for receivables data and Zoho CRM for procurement/payables, handling planned vs. actual budgets and approvals.
Read Case Study →Node.js & Express application for student registration, application submission, and status tracking, with online payment processing, document upload handling, and digital signatures for offer letters.
Read Case Study →Configured complete business flows: Marketing → Lead Generation → Sales Pipeline → Accounting/Finance → Procurement → Production → Inventory → Maintenance → HR → Payroll → Expense Management, with role-based dashboards for Tourism, Solar Manufacturing, Precision Tools, Real Estate, and Ed-Tech/Immigration.
Read Case Study →An Azure-based AI pipeline that reads incoming email attachments, extracts key details (product/issue reported, the salesperson who made the sale, customer info), validates the data, and automatically creates and assigns the right task in Zoho CRM, no manual reading or data entry required.
Read Case Study →I'm Shajin, a full-stack software engineer based in Coimbatore, India. I build complete web applications, automate business workflows on Zoho, and integrate complex third-party platforms like Amadeus, Salesforce, and Stripe. I lead scoping, sprint planning, and client communication for live B2B products, and I'm actively extending into AI/ML-enabled development.
Automated full business flows across 5 industries; built Zoho Marketplace apps and role-based dashboards.
Freelanced while studying advanced full-stack development and AI/ML concepts.
DSA, low-level design (OOP), and web application development.
Led scoping, team leadership, sprint planning & client communication on live B2B products.
3-day practical Django workshop for M.Sc. students.
Working on complex financial historical data for top index funds, building quarterly performance calculation systems using AI/ML and advanced data engineering.
I'm actively taking on new projects: full-stack web apps, Zoho automation, or AI-enabled applications.
Hire Me on Upwork ↗Based in Coimbatore, India. Usually replies within a day.
