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Hi there! If you're looking for a reliable developer who can turn complex ideas into scalable software, I’d be happy to help. I’m a software entrepreneur and full-stack engineer with 20+ years of experience, based in Kolkata, India, specializing in building high-performance applications, cloud platforms, and scalable systems for startups and innovation-driven companies. Over the years, I’ve worked as an extended engineering partner for multiple startups, helping them transform early-stage ideas into production-ready products and successful businesses. My experience spans diverse industries including Mobile Communications (VoLTE/IMS), Oil & Gas, Big Data & AI, and VLSI Design Automation. I understand the realities of startup environments — rapid iteration, evolving requirements, and the need for scalable architecture from day one. My goal is always to deliver clean, reliable, and future-ready solutions. What I Bring : ✔ 20+ years of hands-on software engineering experience ✔ Strong expertise in full-stack development and cloud solutions ✔ Proven experience supporting startups as a long-term engineering partner ✔ Focus on performance, scalability, and maintainable architecture Technical Skills & Expertise: Frontend Development--- React.js • Next.js • Angular • React Native • TypeScript • Flutter HTML5 • CSS3 • Bootstrap • JavaScript • jQuery Backend Development--- Node.js • Express.js • Java • Python • PHP • Ruby ASP.NET • .NET Core • Spring Boot • NestJS • Django • FastAPI • Flask Cloud & DevOps--- AWS • Microsoft Azure • Cloud Architecture • Scalable Backend Systems APIs & Payment Integrations--- REST API Design & Development Stripe • Razorpay • PayPal • CCAvenue • Paytm Databases--- MySQL • PostgreSQL • MongoDB • Cassandra • Neo4j Oracle • SQL Server • Kinetica AI & Intelligent Systems--- LLM Integrations • Prompt Engineering • Data Pipelines • Intelligent Backend Automation Development Methodologies--- Agile Development • Scrum • Kanban • Rapid MVP Development Version Control & Collaboration--- Git • GitHub • GitLab • Bitbucket • SVN Jira • Slack • Trello I also work extensively with AI and LLM integrations, including prompt engineering, structured data pipelines, and intelligent backend automation. Additional Experience--- • VoLTE / IMS / WebRTC communication systems • Mobile & wearable application development • Embedded systems & smart grid solutions • Data analytics & internet acceleration platforms • RFID / barcode systems • Full-stack enterprise web applications Currently, I’m also involved in building “Defender”, a specialized software product designed for military intelligence and law enforcement applications. If you need a dependable senior developer who can design, build, and scale your product — let’s connect. I’d be glad to learn more about your project and discuss how I can help deliver a robust, production-ready solution. Let’s connect and bring your vision to life.

Businesses don't need more software. They need fewer manual processes, fewer errors, better visibility, and systems that actually support growth. I help companies solve operational problems through custom software, automation, AI, integrations, and business systems. My work includes: • ERP and CRM systems • Internal business portals • Inventory and warehouse management • Logistics and tracking platforms • Dashboards and reporting systems • Workflow and process automation • AI-powered business tools • API integrations • Payment gateway integrations • Data migration and synchronization • SaaS platforms • Custom databases and back-office systems Unlike consultants who recommend software subscriptions, I build solutions tailored to the way your business actually operates. I have extensive experience developing scalable web applications, automation platforms, business tools, and enterprise systems for startups, SMEs, and established organizations. Technology is only the implementation. The real goal is reducing manual work, improving efficiency, increasing visibility, and helping your business scale. If you have a process that feels repetitive, fragmented, spreadsheet-heavy, or difficult to manage, there's a good chance it can be automated or transformed into a system that saves time and money. Let's discuss the business problem first, then determine the right technical solution.

Hello! I am an expert 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 and 𝐀𝐈 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐬𝐭 with a strong track record of building robust API integrations, custom EMR systems, and automated communication workflows. With deep expertise in 𝐏𝐇𝐏, 𝐋𝐚𝐫𝐚𝐯𝐞𝐥, 𝐏𝐲𝐭𝐡𝐨𝐧, 𝐍𝐨𝐝𝐞.𝐣𝐬 and modern backend stacks, I design and implement custom databases, connect 3rd-party platforms, and build tailored tools that streamline business operations. Here is how I can add value to your projects: 🔌 𝐀𝐏𝐈 𝐈𝐍𝐓𝐄𝐆𝐑𝐀𝐓𝐈𝐎𝐍 & 𝐀𝐔𝐓𝐎𝐌𝐀𝐓𝐈𝐎𝐍 • 𝐂𝐮𝐬𝐭𝐨𝐦 𝐑𝐄𝐒𝐓 𝐀𝐏𝐈𝐬: Building robust, secure, and well-documented API endpoints. • 𝐂𝐑𝐌 & 𝐒𝐚𝐚𝐒 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Connecting 𝐙𝐨𝐡𝐨 𝐀𝐏𝐈𝐬, 𝐆𝐨𝐇𝐢𝐠𝐡𝐋𝐞𝐯𝐞𝐥 (𝐆𝐇𝐋) 𝐀𝐏𝐈, Pipedrive, Airtable, and Asana for seamless data sync. • 𝐧𝟖𝐧 & 𝐙𝐚𝐩𝐢𝐞𝐫 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧𝐬: Streamlining tasks, syncing leads, and scraping web data to eliminate manual work. • 𝐀𝐈 & 𝐕𝐨𝐢𝐜𝐞 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Integrating 𝐄𝐥𝐞𝐯𝐞𝐧𝐋𝐚𝐛𝐬 for realistic voice generation and AI-powered automation. 💳 𝐏𝐀𝐘𝐌𝐄𝐍𝐓𝐒 & 𝐖𝐄𝐁 𝐃𝐄𝐕𝐄𝐋𝐎𝐏𝐌𝐄𝐍𝐓 • 𝐏𝐚𝐲𝐦𝐞𝐧𝐭 𝐆𝐚𝐭𝐞𝐰𝐚𝐲 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: 𝐒𝐭𝐫𝐢𝐩𝐞 & 𝐏𝐚𝐲𝐏𝐚𝐥 setup, checkout sessions, custom payment links, subscription management, and webhook handling. • 𝐖𝐨𝐫𝐝𝐏𝐫𝐞𝐬𝐬 & 𝐖𝐨𝐨𝐂𝐨𝐦𝐦𝐞𝐫𝐜𝐞: WooCommerce setup, payment gateway integrations, Elementor customization, and fast landing pages. 🏥 𝐄𝐌𝐑, 𝐇𝐄𝐀𝐋𝐓𝐇𝐂𝐀𝐑𝐄 𝐓𝐄𝐂𝐇 & 𝐏𝐀𝐓𝐈𝐄𝐍𝐓 𝐏𝐎𝐑𝐓𝐀𝐋𝐒 • 𝐄𝐌𝐑 𝐂𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Specialized in configuring and customizing 𝐎𝐩𝐞𝐧𝐄𝐌𝐑 systems for Primary Care Clinics. • 𝐂𝐮𝐬𝐭𝐨𝐦 𝐏𝐚𝐭𝐢𝐞𝐧𝐭 𝐏𝐨𝐫𝐭𝐚𝐥𝐬: Development of secure, HIPAA-compliant patient portals and custom EMR workflows. • 𝐏𝐨𝐫𝐭𝐚𝐥 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲: Managing secure clinic servers, patient portals, data backups, and access management. 🚀 𝐓𝐖𝐈𝐋𝐈𝐎, 𝐕𝐎𝐈𝐏 & 𝐂𝐀𝐋𝐋 𝐂𝐄𝐍𝐓𝐄𝐑𝐒 • 𝐕𝐨𝐈𝐏 & 𝐂𝐚𝐥𝐥 𝐒𝐲𝐬𝐭𝐞𝐦𝐬: Configuration of 𝐃𝐢𝐚𝐥𝐟𝐢𝐫𝐞, 𝐓𝐞𝐥𝐧𝐲𝐱, 𝟑𝐂𝐗, 𝐃𝐢𝐚𝐥𝐌𝐲𝐂𝐚𝐥𝐥𝐬, and 𝐂𝐚𝐥𝐥𝐓𝐨𝐨𝐥𝐬 systems. • 𝐒𝐈𝐏 𝐓𝐫𝐮𝐧𝐤𝐢𝐧𝐠: Expert in 𝐒𝐈𝐏 𝐓𝐫𝐮𝐧𝐤𝐢𝐧𝐠 𝐬𝐞𝐭𝐮𝐩 𝐢𝐧 𝐓𝐰𝐢𝐥𝐢𝐨 𝐚𝐧𝐝 𝐓𝐞𝐥𝐧𝐲𝐱 for unified communication setups. • 𝐓𝐰𝐢𝐥𝐢𝐨 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Custom 𝐓𝐰𝐢𝐥𝐢𝐨 𝐓𝐞𝐥𝐞𝐩𝐡𝐨𝐧𝐲 integrations synced with databases like 𝐌𝐲𝐒𝐪𝐥, 𝐒𝐮𝐩𝐚𝐛𝐚𝐬𝐞 or 𝐏𝐨𝐬𝐭𝐠𝐫𝐞𝐒𝐐𝐋. • 𝐈𝐕𝐑 & 𝐒𝐌𝐒 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧𝐬: Building multi-business communication suites, automated call routing, and campaigns. • 𝟏𝟎𝐃𝐋𝐂 𝐂𝐨𝐦𝐩𝐥𝐢𝐚𝐧𝐜𝐞: Streamlining brand/campaign registrations to ensure 𝟏𝟎𝟎% 𝐒𝐌𝐒 𝐜𝐨𝐦𝐩𝐥𝐢𝐚𝐧𝐜𝐞. 🛠️ 𝐌𝐘 𝐓𝐄𝐂𝐇𝐍𝐈𝐂𝐀𝐋 𝐒𝐓𝐀𝐂𝐊 • 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: PHP, Laravel, Python, Node.js, MySql, Supabase, PostgreSQL • 𝐏𝐚𝐲𝐦𝐞𝐧𝐭𝐬: Stripe, PayPal • 𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧 & 𝐕𝐨𝐈𝐏: Twilio API, Telnyx, Dialfire, CallTools, 3CX PBX, SIP Trunking • 𝐂𝐑𝐌𝐬 & 𝐀𝐏𝐈𝐬: Zoho APIs, GoHighLevel (GHL) API, Pipedrive, Airtable • 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧𝐬: n8n, Zapier, Web Scraping, AI Automation 𝐖𝐡𝐲 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞? ✔️𝐕𝐞𝐫𝐬𝐚𝐭𝐢𝐥𝐞 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐬𝐭 – Experienced in both long-term EMR developments and complex API integrations. ✔️ 𝐑𝐞𝐬𝐩𝐨𝐧𝐬𝐢𝐯𝐞 & 𝐑𝐞𝐥𝐢𝐚𝐛𝐥𝐞 – Active communication with average response time under 4 hours. ✔️ 𝐐𝐮𝐚𝐥𝐢𝐭𝐲-𝐅𝐨𝐜𝐮𝐬𝐞𝐝 – Clean, scalable, and maintainable code tailored to your exact needs. Let's bring your project to life! Click "𝐌𝐞𝐬𝐬𝐚𝐠𝐞" or "𝐈𝐧𝐯𝐢𝐭𝐞 𝐭𝐨 𝐉𝐨𝐛" to discuss your requirements.

Hi , With 8+ years of experience in VoIP engineering and telecom infrastructure, I help businesses build, customize, and scale reliable call center and communication platforms ranging from small business deployments to carrier-grade environments. I specialize in designing high-performance VoIP systems, advanced dialer solutions, telecom billing platforms, and cloud-based communication infrastructures that are secure, scalable, and cost-effective. ⭐️ What I Can Help You With 1. VoIP & PBX Solutions - Asterisk, FreePBX, FreeSWITCH, Elastix, Issabel, FusionPBX - 3CX, PBXware, VoIPOffice - SIP Trunking & Carrier Integrations - Multi-server VoIP architecture - High Availability (HA), clustering, failover, and load balancing - Security hardening and system optimization 2. VICIDial & Call Center Development - Complete Inbound, Outbound, and Blended Call Center Setup - VICIDial installation, customization, and troubleshooting - Custom campaign logic and workflow development - Agent interface redesign and UI/UX enhancements - Custom reports and dashboards - VICIBox multi-server clustering - Voice broadcasting and predictive dialing solutions 3. Asterisk Development - Advanced dialplan design - AGI scripting and custom applications - IVR development and automation - Call routing optimization - Conference solutions and WebRTC integrations - Custom webphone development 4. CRM & API Integrations - Twilio, Telnyx, SignalWire, Bandwidth, Plivo, VoIP.ms - CRM integrations and lead management systems - REST API development and automation - Webhook and real-time data synchronization - Third-party call transfer solutions - TrackDrive and custom lead posting integrations 5. Telecom Billing Platforms - A2Billing - ASTPP - VOS3000 - Magnus Billing ⭐️Services include: - Billing customization - CDR processing - Multi-tenant deployments - Reseller management systems - Callback and IVR customization 1. AI Voice Agents & Automation - ElevenLabs - Vapi - AI-powered voice assistants - Conversational AI integrations - Voice workflow automation 2. SMS Solutions - Bulk SMS platforms - SMS broadcasting systems - Two-way SMS applications - CSV-based bulk messaging portals - Twilio, Telnyx, SignalWire, Bandwidth, and VoIP.ms integrations ⭐️ Supported VoIP Providers Extensive experience integrating with major telecom carriers and providers, including: Twilio, Telnyx, SignalWire, VoIP.ms, Bandwidth, Flowroute, RingCentral, Nextiva, Plivo, Anveo, DIDLogic, IDT Express, SIP.US, Vitelity, Voxbeam, Telus, Nexmo, QuestBlue, Switch2VoIP, and many others. ⭐️ Why Clients Hire Me ✔️ 9+ Years of Specialized VoIP Experience ✔️ Deep Asterisk & VICIDial Source-Code Expertise ✔️ Carrier-Grade Deployments & Multi-Server Architectures ✔️ Strong API Integration & Automation Skills ✔️ Fast Troubleshooting & Performance Optimization ✔️ Reliable Communication & Long-Term Support Whether you need a new VoIP deployment, VICIDial customization, telecom billing platform, AI voice integration, or a complete call center solution, I can deliver a stable, scalable, and production-ready system tailored to your business needs. Le'ts have a chat !

✅ Top Rated Plus AI Agent Development ✅ 100% Job Success Score ✅ Fluent English Verified AI Voice Agents | Twilio Expert | SMS, Calling & CRM Automation I help businesses automate customer communication using AI Voice Agents, SMS Automation, Calling Systems, CRM Integrations, and Communication Workflows. With 130+ completed projects, Top Rated Plus status, and a 100% Job Success Score, I specialize in building production-ready systems that answer calls, qualify leads, book appointments, automate follow-ups, improve customer response times, and reduce manual work. My expertise combines modern AI technologies with real-world communication infrastructure, helping businesses move from manual processes to scalable automation. 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 📞 Voice AI & Communication Automation AI Voice Agents, AI Receptionists, AI Calling Systems, Appointment Booking Agents, Lead Qualification Systems, Customer Support Automation, Contact Centers, IVR Systems, SIP, SMS Automation, Call Routing 🤖 AI Solutions & Conversational Systems OpenAI, Claude, Gemini, Vapi, Retell AI, Conversational AI, Knowledge Assistants, Internal AI Tools, Business Automation ⚙️ CRM & Workflow Automation Lead Management, Pipeline Automation, Customer Communication Workflows, CRM Integrations, Automated Follow-Up Systems 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 📞 AI Voice Agents & Calling Systems • AI Receptionists • AI SDRs • Appointment Booking Agents • Customer Support Agents • Outbound Calling Systems • Inbound Voice Automation • Voice AI Integrations 📡 Twilio & Communication Solutions • Twilio Development • SMS Platforms • IVR Systems • Call Center Solutions • Twilio Flex • Voice & Messaging Automation • Toll-Free & A2P 10DLC Solutions ⚙️ CRM & Business Automation • HubSpot Integrations • GoHighLevel Automation • Salesforce Integrations • Custom CRM Development • Lead Qualification Workflows • Business Process Automation 🧠 OpenAI, Claude & AI Integrations • ChatGPT Solutions • Claude Integrations • AI Assistants • Knowledge Systems • Internal AI Tools • RAG Applications 📱 SaaS, Web & Mobile Applications • Customer Portals • Admin Dashboards • AI-Powered Platforms • Web Applications • Mobile Applications 🖥️ Backend Development Python, Node.js, FastAPI, Express.js, REST APIs, Webhooks, Microservices 💻 Frontend Development React, Next.js, Vue.js, Angular 📱 Mobile Development React Native, Flutter, Swift, Kotlin ☁️ Cloud & Infrastructure AWS, Azure, GCP, Docker, CI/CD, Serverless Architectures 📊 Databases & AI Infrastructure PostgreSQL, MongoDB, Firebase, Supabase, Vector Databases 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 • Real Estate & Property Management • Healthcare & Wellness • LegalTech • Financial Services • Logistics & Transportation • Professional Services • Call Centers • Home Services • SaaS & Technology Companies If you're looking to automate calls, SMS, customer communication, lead qualification, appointment booking, or customer support using AI and Twilio-based communication systems, let's discuss your project. Keywords: AI Voice Agent, AI Receptionist, AI Calling Agent, Twilio Developer, SMS Automation, IVR Development, CRM Automation, Voice AI, OpenAI, Claude, Vapi, Retell AI, Contact Center Solutions, Call Center Automation, Lead Qualification, Appointment Booking, Customer Communication Automation, Workflow Automation, Conversational AI, SaaS Development, Python, Node.js, React

⭐ Expert-Vetted (Top 1% on Upwork) ⭐ $300K+ Earned ⭐ 100% Job Success ⭐ 85+ Successful Projects "Nick exceeded expectations and is one of the only contractors we've worked with on Upwork that is capable of understanding the end goal of a project and architecting a solution from scratch to meet our KPIs. He required very little direction and consistently delivered beyond expectations." — Berger Consulting Group ------------------------------ YOUR BUSINESS DOESN'T NEED MORE SOFTWARE. IT NEEDS BETTER OPERATIONS. I help growing companies streamline operations by identifying bottlenecks, redesigning inefficient workflows, and building custom software, AI solutions, and workflow automation that saves time, reduces costs, and helps teams scale. Unlike a traditional developer, I don't start by asking what software you want. I start by understanding how your business works, then design the systems, automations, and processes that solve the underlying problem. Whether you're struggling with disconnected systems, manual workflows, spreadsheets, reporting, client onboarding, or repetitive administrative work, I'll help architect a solution that fits your business—not force your business into someone else's software. I don't just build what clients ask for—I help determine what should be built in the first place. ------------------------------ HOW I HELP 1. OPERATIONS CONSULTING - Business Process Analysis - Workflow Mapping - Process Improvement - Bottleneck Identification - Operational Strategy - Systems Architecture - Change Management - Process Documentation 2. CUSTOM INTERNAL SOFTWARE I design and build custom business systems around your existing operations. Examples include: - Internal Operations Platforms - Custom CRM Systems - Client Portals - Employee Portals - Operations Dashboards - Reporting Systems - Scheduling Systems - Claims Management Systems - Administrative Tools 3. AI & WORKFLOW AUTOMATION Reduce manual work and connect your existing systems. Examples include: - AI Workflow Automation - OpenAI Integration - Claude Integration - n8n Automation - Zapier Automation - Make Automation - API Integrations - Automated Reporting - Client Onboarding Automation - Internal AI Assistants - Data Synchronization 4. BUSINESS INTELLIGENCE & ANALYTICS Turn your business data into actionable insights. - Executive Dashboards - KPI Reporting - SQL Reporting - Data Visualization - Operational Metrics - Business Intelligence - Process Analytics ------------------------------ TYPICAL PROJECTS Clients typically hire me for projects such as: - Business Process Improvement - Workflow Automation - AI Implementation - Custom Internal Software - Client Onboarding Systems - Custom CRM Development - Operations Dashboards - Reporting Platforms - Internal Business Tools - Retool Applications - Healthcare Operations - Claims Processing Systems - API Integrations - Business Systems Integration - Executive Dashboards ------------------------------ MY PROCESS 1. DISCOVERY We'll identify what your business is actually trying to accomplish—not just the software you think you need. 2. SOLUTION DESIGN I'll map your workflows, identify bottlenecks, and design the right operational and technical solution. 3. IMPLEMENTATION I'll build the software, dashboards, automations, integrations, and internal tools needed to execute the plan. 4. OPTIMIZATION We'll measure results, refine the solution, and continuously improve your operations over time. ------------------------------ TECHNOLOGIES I choose technology based on your business—not the other way around. Automation - n8n - Zapier - Make - Google Apps Script Custom Software - Retool - Python - JavaScript - HTML/CSS Databases - PostgreSQL - MySQL - SQL - Supabase Artificial Intelligence - OpenAI - Claude / Claude Code - AI Agents - Prompt Engineering Business Intelligence - Excel - Google Sheets - Tableau - Looker Studio - DOMO ------------------------------ WHY CLIENTS HIRE ME Many developers build exactly what they're asked to build. I help clients determine what should be built in the first place. That means asking better questions, understanding how your business actually operates, and designing systems that create long-term business value, not just working software. I enjoy solving complex operational challenges and helping organizations eliminate manual work, connect disconnected systems, improve visibility, and build scalable internal processes. Whether your project is a focused automation or a company-wide operational transformation, my goal is the same: - Understand your business. - Design the right solution. - Build it correctly. - Measure the impact. - Continuously improve it. If you're looking for someone who can think strategically, improve operations, and build custom software that creates measurable business value, I'd love to discuss your project. Let's build something that makes your business run better.