Hire the Best Chatbot Developers in Kolkata, IN

I don’t just write code. I work as a product partner helping refine ideas, suggesting improvements, and ensuring every project is aligned with your business goals. Clients value me for delivering on time and for my ability to take ownership of the product vision, not just complete tasks. Along the way, I’ve built AI chatbots with 50K+ users, AI agents that reduced workload by 60%, and full-stack SaaS products generating $2M in monthly revenue. I’ve also developed a product selected by Y Combinator and another that was acquired within 2 years. My unique edge is combining AI innovation with full-stack development — building scalable products, intelligent automations, and platforms that deliver measurable business outcomes. 🔹 Core Expertise ✅ AI Product Development: GPT-powered apps, chatbots, AI agents ✅ Automation & Integration: n8n, Zapier, Make, workflow orchestration, API integrations ✅ Frontend: React.js, Vue.js, React Native, TypeScript, HTML5, CSS3, Bootstrap ✅ Backend: Node.js, PHP, Laravel, WordPress ✅ Databases: MongoDB, MySQL, PostgreSQL ✅ Cloud & DevOps: AWS, Azure, GCP, DigitalOcean ✅ Design & Prototyping: Figma 📈 Success Snapshot ✅ Built chatbots with 50K+ users and AI agents → saved teams 20+ hours weekly ✅ Helped scale SaaS platforms from MVP to 50,000+ users with strong uptime ✅ Managed a SaaS product generating $2M monthly revenue ✅ Built a product selected by Y Combinator and another acquired in 2 years ✅ Delivered automation pipelines with n8n/Zapier/Make → improved efficiency by 60% 🔹 Why Clients Work With Me ✅ Blend of full-stack engineering + AI expertise ✅ Proven record of building products that generate revenue, get funded, and get acquired ✅ Take ownership: I contribute ideas, refine features, and improve product vision — not just execute tasks ✅ Always deliver on time, with a transparent, milestone-driven workflow ✅ Balance of technical depth + product mindset, ensuring solutions that grow with your business 👉 If you’re looking for a developer who can build scalable apps, integrate AI, and act as a true product partner with ownership, let’s connect. For Search Optimization: AI Developer, Full-Stack Developer, SaaS Developer, Node.js Developer, React.js Developer, Vue.js Developer, Chatbot Developer, AI Agent Developer, Automation Developer, n8n Expert, Zapier Specialist, Make Expert, Workflow Automation, GPT Integration, AI SaaS Developer, Backend Developer, Frontend Developer, Cloud Developer, AWS Developer, GCP Developer, Azure Developer, Figma UI/UX

🔹 Full Stack Web Developer | 12+ Years | 150+ Projects Delivered I build high-performing websites, e-commerce stores, and automation workflows that are elegant, fast, and conversion-focused. Expert in WordPress, Shopify, Webflow, Squarespace, WIX, and GoHighLevel. 🌍 Full Stack Developer | Web Designer | Funnel and Automation Specialist 👉 Full Stack Developer | WordPress • Shopify • Webflow • Squarespace • ADA/WCAG Accessibility 👋 About Me I’m Santanu Bera, a Full Stack Developer with over 12 years of experience helping businesses build, scale, and automate their digital presence. I specialize in high-performing websites, e-commerce platforms, and automation workflows that don’t just look good—but drive measurable results. My unique advantage lies in combining technical expertise with marketing strategy, ensuring your digital assets aren’t just functional, but optimized for conversion, performance, and ROI. 💡 What I Offer 🔹 Custom Website Development WordPress (custom themes & plugins, Elementor, Gutenberg) Webflow, Squarespace, WIX, Kajabi, Systeme.io, WeWeb Responsive, SEO-friendly, and future-proof websites 🔹 E-Commerce Solutions Shopify, WooCommerce, and custom-built stores Product catalogs, secure payment gateways Inventory management & optimized checkout flows Conversion-focused layouts that boost sales 🔹 Automation & CRM Workflows GoHighLevel automation: CRM setup, pipelines, sales funnels Zapier & n8n automation: API integrations, bots, email/SMS flows Mailchimp, HubSpot, and custom CRM integrations 🔹 Full Stack Development PHP, Python, Node.js, React, Vue, Angular Database optimization: MySQL, MongoDB, PostgreSQL API integrations, custom dashboards, AI chatbots 🔹 Performance & Security Optimization WordPress Speed Optimization (Core Web Vitals compliance) Technical SEO implementation Security hardening & backup automation 🔹 Accessibility (WCAG / ADA Compliance) WCAG 2.1 AA & ADA compliance testing and remediation Accessibility audits and fixes for websites & web apps Screen reader, keyboard navigation, and contrast compliance Inclusive design for e-commerce and corporate platforms 🌟 Why Clients Choose Me ✔ 12+ years of proven success with 200+ delivered projects ✔ Multi-platform expertise (WordPress, Webflow, Shopify, Squarespace, WIX, Kajabi, GoHighLevel) ✔ Scalable solutions designed for growth, performance, and ROI ✔ Strong communicator with a detail-oriented, collaborative approach ✔ End-to-end partner: From strategy → development → optimization 🚀 Keywords / Specializations (for Upwork SEO) WordPress Developer | Elementor Expert | WooCommerce Developer Shopify Expert | Squarespace Developer | Webflow Designer WordPress Speed Optimization | Core Web Vitals | WordPress Security Custom WordPress Theme & Plugin | Technical SEO | API Integration Zapier Expert | n8n Automation Expert | Workflow Automation Specialist GoHighLevel CRM | Systeme.io | Funnel Builder | Email/SMS Automation | HubSpot Automation AI Chatbot Developer | Webflow CMS | WIX Studio Expert | Kajabi Specialist | Web Developer Brilliant Directory | Caspio | Website Migration ✅ Let’s Work Together If you’re looking for a developer who can design, build, and optimize your digital presence while ensuring speed, performance, and measurable results — let’s connect. I’ll bring both technical precision and creative vision to your project, ensuring your website or platform not only works flawlessly but also drives business growth. ⚡ Next Step: Invite me to your project, and let’s discuss how I can help you hit your digital goals with clarity and confidence.

⭐️Top Rated Plus⭐️🖥️Website Development🖥️⭐️Custom Web Application⭐️📱Hybrid Mobile App📱⚛️ Native Mobile Apps ⚛️🔍AI ChatBot Development🔍⚛️ERP, CRM, PMS, HRMS Development🌐🐘Python Development🐘🌐Laravel Development🌐🚀 Node.JS Development🚀⚛️React.JS Frontend⚛️🅰️Next.JS Frontend🅰️🚀UI/UX Prototype/Mockup🚀🌐Logo & Branding🌐🖥️Figma UI/UX Design🖥️📱React Native📱AI Agent Development 🌐📡3rd Party APIs Integration📡🔍 MySQL, MariaDB, MongoDB 🔍 💳Payment Gateway Integration 💳📡Open AI ChatGPT & Others📡🌐Maintenance & Support🌐🌐Hosting Server Setup & Configuration🌐 ⭐️ My expertise in rapid prototyping, proof of concept development, and launching minimum valuable products can help you minimize costs and accelerate your time-to-market. ⭐️ Laravel, Node.JS, React.JS, Next.JS and Python are my forte when it comes to any custom website/web app design & development. ⭐️I'm proficient in Laravel, Node.JS, React.JS, Next.JS, React Native, Swift, Kotlin and Python etc. making me adept at crafting robust Back ends, Front end, Mobile Apps, Bots for any websites, web applications or Mobile apps. ⭐️ My skills extend to JavaScript, Tailwind, React.JS, Next.JS etc. for creating dynamic and engaging Front End User Interfaces and User Experiences. ⭐️ I have hands-on experience in integrating databases, including MySQL, MongoDB, and SQLite/SQL, ensuring data-driven functionality. ⭐️ I will discuss in details on needs, purpose and goals for the project. The more you share about your business and goals for a project, better my understanding and provide ultimate results. ⭐️ I always prioritize quality throughout the development lifecycle, incorporating rigorous QA and testing processes to deliver robust and reliable applications. 🏆 Accredited 'Top Rated' on Upwork 🏆 Top 3% of Performers on Upwork 🏆 100% Job Success Rate on Upwork ⭐ Seamless & Prompt Communication 🏆 Over $100K+ Earnings on Upwork 🏆 14+ Years working on Upwork 𝕎𝕙𝕒𝕥 𝕆𝕗𝕗𝕖𝕣 : ► 𝘿𝙞𝙨𝙘𝙪𝙨𝙨𝙞𝙤𝙣: I will discuss in details on needs, purpose and goals for the project. The more you share about your business and goals for a project, better my understanding and provide results. ► 𝙏𝙧𝙞𝙚𝙙-𝙖𝙣𝙙-𝙩𝙧𝙪𝙚 𝙞𝙙𝙚𝙖𝙨 𝙖𝙣𝙙 𝙥𝙧𝙤𝙘𝙚𝙙𝙪𝙧𝙚𝙨: I bring a wealth of proven concepts, methods, and techniques to enhance productivity and efficiency. This ensures faster turnaround and reduces re-work. ► 𝙌/𝘼 & 𝙏𝙚𝙨𝙩𝙞𝙣𝙜: I prioritize quality throughout the development lifecycle, incorporating rigorous QA and testing processes to deliver robust and reliable applications. 𝕎𝕙𝕪 ℍ𝕚𝕣𝕖 ? ► 𝙏𝙧𝙖𝙣𝙨𝙛𝙤𝙧𝙢 𝙮𝙤𝙪𝙧 𝙞𝙙𝙚𝙖 𝙞𝙣𝙩𝙤 𝙧𝙚𝙖𝙡𝙞𝙩𝙮: I excel in business analysis, selecting the right technology stack, and implementing proper development processes to bring your idea to life. ►𝙎𝙖𝙫𝙚 𝙩𝙞𝙢𝙚 𝙖𝙣𝙙 𝙢𝙤𝙣𝙚𝙮: My expertise in rapid prototyping, proof of concept development, and launching minimum valuable products can help you minimize costs and accelerate your time-to-market. ► 𝙈𝙖𝙧𝙠𝙚𝙩 𝙮𝙤𝙪𝙧 𝙥𝙧𝙤𝙙𝙪𝙘𝙩: With the right team and a well-defined software development cycle, I can assist you in effectively marketing your product to real customers. ►𝙍𝙚𝙙𝙪𝙘𝙚 𝙧𝙞𝙨𝙠𝙨 𝙖𝙣𝙙 𝙘𝙤𝙨𝙩𝙨: I ensure precise and technically feasible requirements, minimizing development risks and costs. ►𝘾𝙧𝙚𝙖𝙩𝙚 𝙧𝙤𝙗𝙪𝙨𝙩 𝙨𝙤𝙡𝙪𝙩𝙞𝙤𝙣𝙨: I can set up a robust environment, establish efficient and scalable infrastructure. T𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲 𝐬𝐭𝐚𝐜𝐤: 𝐆𝐫𝐚𝐩𝐡𝐢𝐜𝐬: Photoshop, Illustrator, Figma, XD 𝐅𝐫𝐨𝐧𝐭 𝐞𝐧𝐝: React.JS, Next.JS, JavaScript, TypeScript, Tailwind etc. 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩: Flutter, React Native, Swift & Kotlin 𝐁𝐚𝐜𝐤 𝐞𝐧𝐝: Node.JS, PHP, Laravel, CodeIgniter, Python 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: MongoDB, MySQL, MariaDB Automation: Python, AI Bots, Fast API Myself, Rahul Deb Patra based at Kolkata, India, working on EST, IST & GMT timezones mainly. I'm a Sr. Full Stack Developer cum Project Manager having vast working experience of 15+ years with Web - Mobile - Automation Platforms, Web - Mobile UI/UX Designs, Responsive Web Designs, Web - Mobile Custom Development, Custom Web Development using JS Framework, Digital Marketing etc and also passed 3 years regular master's degree MCA from a reputed college & university in 2011 and since pass out doing the job but improving as well. I have already completed various kind of projects successfully & have a portfolio as well, showcased with live projects. Please take a look at our Portfolio to understand, if I'm not wrong. I love to work and passionate with my job. That's all to say for myself !!

Hi there! I am Sashi, a digital companion of yours who will work and try to solve all of your problems with full endeavor & enthusiasm. I help clients build chatbots that engage customers & most importantly - convert! So are you looking for methods to scale your marketing efforts so that you can increase your opt in rates, workshop show up rates, increase lead conversion and therefore ultimately increase your revenue?📈 You've arrived just at the right place! I make chatbots for : ✅ Facebook ✅ Instagram ✅ Twitter ✅ WhatsApp ✅ Telegram ✅ Line ✅ Websites ✅ SMS & Voice channels Expertise in TOP chatbot platforms : ✔️ ManyChat ✔️ Tidio ✔️ BotPress ✔️ UChat ✔️ Chatfuel ✔️ MobileMonkey ✔️ WATI ✔️ Voiceflow ✔️ Intercom ✔️ chatbot.com ✔️ RASA 📌 Advanced Knowledge in: - ChatGPT API - Conversation Design - Machine Learning & AI Analytics - Front End : Figma To Flutter , JavaScript , HTML , CSS , React Js, Django - Back End : C++ , PHP , Python , Node Js , Django , Ruby , MySQL , .NET 📌 Chatbots that I create include : - Messenger Automation - Facebook Ads Automation - FB and IG : Lead Capture And Conversion - ChatGPT Integration - FAQ Bots - Follow-Up Bots - Ticket generation - Custom Chatbot Widgets Time is valuable ! That's why I aim to simplify the process and ensure a clear understanding of my workflow to avoid any communication gaps. My expertise extends beyond using automation software. I can also review your existing chatbots, offer training sessions, and teach you how to create and manage your own chatbots. *Please feel free to message me anytime and if you want to see demos of my bots & works. Just let me know, and I’ll send the most relevant ones over to you.* Let's start boosting your customer interactions! 🚀

🌟 Top rated Full-Stack Developer | Mobile App & Website Development Expert | UI/UX Specialist | Python & Chatbot Developer | SAP | SAP BTP | Chatbot |🌟 Unlimited revision of design to ensure you get exactly what you're looking for Ex Infosys, IBM, SAP Over 55000+ hours worked so far With an experience of more than 15 years in IT, i bring in a range of experience for your IT needs. He has a wide range of experience in SAP, Java and Mobility and demonstrates solutioning skills to find the right solution for your enterprise problems. I have a prior experience in working with large MNCs like IBM and SAP and working in various geographies like Germany, Switzerland, Japan and India. Currently I am the Director of ROITech and also play the key role of as software evangelist and a solution architect. I provide end-to-end development tailored to your needs. My aim is to make your ideas a reality with scalable, secure, and user-friendly solutions. I'm specialized in several Website Development & Mobile Apps Development skills. Some of my expertise follows, ⭐️ Web Application Development ✅ Website Development ✅ E-Commerce website development ✅ MEAN Stack Development ✅ Angular Application Development ✅ Node JS Development ✅ MERN Stack Development ✅ React JS Development ✅ Laravel Application Development ⭐️ Mobile Application Development ✅ Hybrid Application Development ✅ React Native Development ✅ Flutter ✅ Native Application Development ✅ Swift ✅ Objective C ✅ Java ✅ Kotlin ⭐️ SAP ✅ BTP ✅ Fiori ✅ ABAP

Agentic AI Developer Full-Stack Engineer 10+ Years of Experience Master In - Module Developments ERP, CRM, E-Commerce, SAAS Development Environment - Amazon EC2, FTP, Git - CI/CD pipelines and cloud-native deployments Frontend Expertise - Angular (Versions 1, 2, 4, 5) - React with Redux - Next.js for server-side rendering and modern web apps - HTML5 Canvas for complex UI and interactive visualizations - Commercial Open-Source Library integrations - Google Analytics & Snapshot integration on Angular Backend & API Development - NestJS & Node.js for scalable APIs - Python for AI-driven solutions and automation - Complex API design and microservices architecture Database Mastery - MySQL with advanced query optimization - Eloquent ORM for polymorphic design handling millions of records - Scalable database design for enterprise applications Frameworks & Platforms - Laravel, CodeIgniter, Symfony, Slim - Custom Web Application Development - Migration & API Development - Startup MVP Development - ERP, CRM, E-Commerce, SAAS Solutions Payment Gateway Integrations - Stripe, PayPal, Razorpay Testing & Optimization - Unit Testing with Jasmine - Build & Compression Tools: Yarn, Gulp, Webpack, Bower - Performance tuning and code optimization Key Strengths - Strong expertise in Agentic AI development with Python - Proven ability to deliver enterprise-grade solutions across ERP, CRM, and SAAS domains - Skilled in complex UI/UX design and scalable backend architectures - Hands-on experience with cloud deployments and DevOps practices