vikas singh
Senior backend engineer with 6+ years of experience building NestJS systems, distributed APIs, and agentic AI.
Stack
All skills
JavaScript
TypeScript
Solidity
C++
C
NPM
PNPM
Node.js
NestJS
Express.js
Ollama
Nodemon
ESLint
Swagger
MySQL
PostgreSQL
MongoDB
Amazon DynamoDB
Redis
RabbitMQ
Apache Kafka
Webhooks
WebRTC
WebSockets
gRPC
Docker
Kubernetes
Firebase
AWS
DigitalOcean
Vercel
Git
GitHub
GitLab
Jira
OpenSeaExperience
All experienceOct 2025 - Present
Web3 Backend Developer
The Hashgraph Group
Pfäffikon, Zurich, Switzerland
Recent work
All projectsAgent Orchestration
Tool-calling agent service built on a LangGraph StateGraph orchestration loop (planner, tool execution, conditional routing) over a RAG pipeline with OpenAI embeddings and a Chroma vector store; ships a reusable tool library (web search, email, knowledge-base retrieval) exposed through a FastAPI backend with REST and SSE streaming endpoints and a React dashboard.
View case studyCustom Ai Agent
A monorepo containing a NestJS backend and Next.js frontend for chatting with a local Llama 3.2 model via Ollama, with RAG (Retrieval-Augmented Generation) capabilities for context-aware responses.
View case studyPrompt Relay Landing
A fast, responsive marketing landing page for Prompt Relay — a Chrome extension that tracks AI context usage and relays conversations between assistants.
View case study