Greater Kolkata Area
I build AI systems that actually work in production — not demos. With 22+ years across fintech, logistics, healthcare, and enterprise BI, I've led engineering at every level: hands-on architect, team builder (30+ developers), and strategic technical advisor to global clients including Atkins-Global, SNC-Lavalin, and Faithful & Gould. 🔐 One of India's Original UPI Engineers (NPCI, 2016) In 2016, I was among the earliest engineers to build production-grade UPI infrastructure in India — including its security layer. I implemented RSA public/private key pairs, digital signatures, and AES encryption for NPCI-backed payment gateways connecting IDBI Bank and Axis Bank. UPI now processes 13B+ transactions/month and is a global benchmark. I helped build the rails it runs on. 🤖 What I Do Now I architect and ship production GenAI & Agentic AI systems using LangChain, RAG pipelines, Vector Databases, multi-agent frameworks, and LLMs (ChatGPT, Claude, Mistral, LLaMA). I've built fully autonomous ITIL operations solutions, voice-enabled AI Personal Assistants integrated with enterprise microservices, and GenAI-enhanced product platforms — all in production, not POC. 🏗 Technical Range Java · Spring Boot · Node.js · Python · AWS · Microservices · WebRTC · Docker · CI/CD 📍 Based in Kolkata, India · Immediate joiner · Open to remote, hybrid, or on-site globally If you're building something serious with AI — or need someone who can lead the engineering and the strategy — let's talk.
Led end-to-end product engineering for an on-demand logistics platform — mobile apps, web, and backend. → Directed a 10-member team to ship consumer and partner apps on a Node.js backend, cutting time-to-market by 40% → Architected real-time WebSocket + WebRTC communication layer, improving dispatch speed by 15% → Built operational analytics dashboards, eliminating 50% of manual reporting overhead → Evaluated LLM-based dispatch optimisation and AI-assisted customer support for next product phase Stack: Node.js · WebRTC · WebSocket · AWS · React Native
Strategic AI architecture and R&D consulting for global enterprise clients — Atkins-Global, SNC-Lavalin, Faithful & Gould — across BI, BPM, and CRM domains. → Designed and shipped IKONV6 — a GenAI-enhanced project management and analytics platform → Built a fully autonomous ITIL operations solution powered by LLMs with minimal human intervention → Delivered AI Agent–driven POCs: voice-enabled Personal Assistants interacting with enterprise microservices — 30% efficiency gain → Led and mentored 30+ developers in Agile, test automation, CI/CD, and GenAI-first engineering → Deployed LangChain, RAG pipelines, Vector Databases, and multi-agent architectures in production R&D Stack: Java · Spring Boot · Node.js · ChatGPT · Claude · Mistral · LangChain · RAG · Vector DB · AI Agents · AWS
Architected Litmus DX — an innovative telemedicine and healthcare e-commerce platform supporting real-time doctor-patient consultations. → Designed a WebRTC-based video consultation system, expanding healthcare access for thousands of patients nationwide → Built scalable JMS/ActiveMQ messaging and Spring MVC appointment workflows for high-volume concurrent usage → Introduced CI/CD standards, achieving a 25% drop in software defects and faster, more reliable releases → Delivered a robust, scalable architecture that significantly improved platform uptime and patient experience Stack: Java EE · Spring MVC · WebRTC · ActiveMQ · JMS · CI/CD · Linux
★ PIONEER: Early Developer of UPI — India's Digital Payment Revolution In 2016, I was among the earliest engineers to build production-grade UPI infrastructure in India — when UPI was still in its infancy and processing its first real transactions. I engineered Java 8 / Spring MVC payment gateways for NPCI-backed UPI solutions connecting IDBI Bank and Axis Bank, and standardised bank onboarding APIs that set the pattern for nationwide adoption. UPI today processes over 13 billion transactions per month, powers 40%+ of India's digital GDP, and has become a global benchmark adopted by Singapore, UAE, France, and beyond. My early-stage contribution to this foundational infrastructure represents rare, ground-floor participation in one of the world's most successful fintech platforms. Engineered secure, high-volume Unified Payments Interface (UPI) solutions connecting major Indian banks including IDBI and Axis Bank under the NPCI mandate — at the very genesis of India's digital payments revolution. → Built secure Java 8 / Spring MVC payment gateways handling high-frequency financial transactions at scale for IDBI and Axis Bank → Engineered the security layer of UPI — implemented end-to-end transaction security using asymmetric encryption (RSA public/private key pairs), digital signatures, and symmetric encryption (AES) to protect payment data at rest and in transit, meeting NPCI and RBI cryptographic compliance standards → Standardised bank onboarding APIs under NPCI standards, cutting integration time by 30% and accelerating UPI ecosystem expansion → Enhanced Linux-based deployment strategies, maximising uptime and transaction throughput for mission-critical payment flows → Delivered production-grade fintech infrastructure fully aligned with RBI compliance standards Stack: Java 8 · Spring MVC · REST APIs · Linux · UPI · RSA · AES · PKI · Digital Signatures · NPCI · IDBI · Axis Bank
Built NLP-powered financial intelligence and predictive analytics tools — a direct precursor to modern GenAI applications. → Led R&D team delivering Agrud Financial Portfolio — automated structured narrative generation for stock analytics using OpenNLP and Stanford NLP → Used AI-driven NLP pipelines for automated financial commentary — 50% productivity increase → Leveraged AWS + Hadoop to cut big data processing from hours to minutes → Pioneered automated content generation at scale, laying the foundation for LLM-style applications years ahead of the mainstream Stack: Java · OpenNLP · Stanford NLP · AWS · Hadoop · Apache Spark · Spring