What I do
Six ways I help teams ship.
From system design to shipped AI features — available for freelance and remote engagements worldwide.
Selected work
Enterprise-grade, end to end.
AI tools
Five live tools I built with generative AI.
Free, no sign-up. Each turns a plain-English prompt into a production-ready result.
Testimonials
Colleagues, co-founders & clients.
Managing a 20-member cross-functional team on classified Ministry of Defence systems is no small feat. Vivek delivered GIGW-compliant platforms on time with 99.8% uptime. His leadership through complex stakeholder environments was outstanding.
Preetam Parveen
Director · Peymagen Informatics · India
Working with Vivek as our founding engineer was a turning point. The BeFree platform he built from scratch achieved 40% organic growth and 30% performance gains. His product thinking and full-stack execution set us on the right path.
Akshay Tripathi
Founder · Pulselink Innovations · India
Vivek built our LLM-powered customer support system in record time. His knowledge of agentic AI workflows and prompt engineering delivered exactly what we needed — accurate, cost-efficient, and production-ready from day one.
Sarah Chen
Product Lead · Freelance Client · Singapore
About
5+ years, startup to enterprise.
Worked with
Vivek Kumar Singh is a Solution Architect, Generative AI Engineer, and Full Stack Developer with 5+ years of enterprise experience across four organisations — Zehntech, Pulselink Innovations, Peymagen Informatics & Automation, and currently Funai Consulting India (Funai Soken Holding, Tokyo, Japan) as a Technical Expert. He is available globally for freelance consulting and remote engagements across the US, UK, Europe, Japan, UAE, Australia, and India.
As a Generative AI Engineer, Vivek architects and ships production LLM integrations, RAG systems (Retrieval-Augmented Generation), agentic AI workflows, and multi-agent systems using OpenAI GPT-4o, Anthropic Claude, and open-source LLMs. He designs AI automation pipelines, vector search architectures, and prompt engineering frameworks — integrated directly into enterprise Java and Next.js applications via LangChain, Vercel AI SDK, and custom AI agent orchestration.
As a Solution Architect, Vivek designs scalable microservice architectures, API gateway strategies, and event-driven systems. He led the migration of classified applications to Next.js for the Indian Ministry of Defence — managing a 20-member team and deploying GIGW-compliant systems on NICSI portal and Army intranet with 99.8% uptime. His automation practice spans Zoho CRM (an agile alternative to Salesforce & SAP), CI/CD pipelines, Firebase, AWS Lambda, and enterprise API orchestration.
5+
Years experience
20+
Technologies
30+
Projects delivered
3
Countries served
Technology stack
Java · Spring Boot · React.js · Next.js · TypeScript · Node.js · Generative AI · Agentic AI · LLM Integration · RAG Systems · Multi-Agent Systems · OpenAI GPT-4o · Anthropic Claude API · LangChain · Vercel AI SDK · Vector Search · Prompt Engineering · Zoho CRM · AWS · Firebase · PostgreSQL · Redis · Docker · GitHub Actions · SharePoint SPFx · Framer Motion · Three.js · Tailwind CSS · REST APIs · Microservices · Event-Driven Architecture · GIGW Compliance · NICSI · Jenkins · MySQL · Redux Toolkit
FAQ
Frequently asked questions.
Who is Vivek Kumar Singh?+
Vivek Kumar Singh is a Solution Architect, Generative AI Engineer, and Full Stack Developer with 5+ years of enterprise experience. He currently works as a Technical Expert at Funai Consulting India (subsidiary of Funai Soken Holdings Inc., Tokyo, Japan), onsite in Tokyo. Previously a Senior Software Engineer at Peymagen Informatics delivering Ministry of Defence systems, and Founding Engineer at Pulselink Innovations.
What does Vivek Kumar Singh do?+
Vivek Kumar Singh architects LLM integrations, RAG systems, agentic AI workflows, and multi-agent systems. He builds full-stack applications with Java, React.js, and Next.js, and engineers Zoho CRM solutions as an alternative to Salesforce and SAP. He also designs cloud-native microservice architectures and leads cross-functional engineering teams.
Where is Vivek Kumar Singh based?+
Vivek Kumar Singh is currently based in Tokyo, Japan, working onsite as a Technical Expert at Funai Consulting India — a subsidiary of Funai Soken Holdings Inc.. He is originally from India and is available for remote freelance consulting worldwide.
What technologies does Vivek Kumar Singh specialize in?+
Vivek Kumar Singh specializes in Java, Spring Boot, React.js, Next.js, TypeScript, Node.js, Generative AI, LLM Integration, RAG Systems, Agentic AI, Multi-Agent Systems, OpenAI GPT-4o, Anthropic Claude API, LangChain, Vercel AI SDK, Zoho CRM, Firebase, AWS, Redux Toolkit, Framer Motion, and Three.js.
How can I contact Vivek Kumar Singh?+
You can contact Vivek Kumar Singh through his portfolio at vivekkumarsingh.in/contact, via LinkedIn at linkedin.com/in/singhvvk, or by email at intellectwithvivek@gmail.com.
Let's build something.
Have a product, an AI feature, or an architecture you want to get right? I reply within 24 hours.