vikas singh
Senior backend engineer with 6+ years of experience building NestJS systems, distributed APIs, and agentic AI.
Stack
All skills
JavaScript
TypeScript
SQL
Solidity
C++
C
NPM
PNPM
Node.js
NestJS
Express.js
FastAPI
LangChain
LangGraph
Ollama
Nodemon
ESLint
Swagger
JWT
TypeORM
MySQL
PostgreSQL
MongoDB
Amazon DynamoDB
Redis
RabbitMQ
Apache Kafka
Webhooks
WebRTC
WebSockets
gRPC
GraphQL
Docker
Kubernetes
Helm
Prometheus
Grafana
Turborepo
Nx
Firebase
AWS
DigitalOcean
Vercel
Git
GitHub
GitLab
Jira
Hedera Hashgraph
EVM
The Graph
Gnosis Safe
OpenSeaExperience
All experienceOct 2025 - Present
Senior Backend Developer
The Hashgraph Group
Pfäffikon, Switzerland (Remote)
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
Production-style RAG agent: NestJS chat API over a local Llama 3.2 model (Ollama), document storage in PostgreSQL, nomic-embed-text embeddings, Qdrant semantic search, scheduled incremental sync, and Docker Compose for the full stack (Postgres, Qdrant, Ollama, API, UI).
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