I build production-ready web applications, AI-powered products, and backend systems across frontend, backend, data, cloud, and DevOps.

I'm a Full Stack Software Engineer focused on building real-world products rather than isolated demos.

My work spans:

• ⚛️ Modern frontend applications with React and Next.js
• ⚙️ Backend systems using Node.js, FastAPI, and Django
• 🤖 AI applications using LLMs, RAG, embeddings, and vector search
• 🗄️ Data systems with PostgreSQL, MongoDB, MySQL, Redis, and pgvector
• ☁️ Production infrastructure using AWS, Docker, CI/CD, and observability tools
• 🔐 Authentication, RBAC, APIs, real-time systems, and secure application architecture

I enjoy working on products where engineering, product thinking, and infrastructure meet.

Full Stack Applications
├── Modern Frontends
├── Backend APIs
├── Authentication & RBAC
├── Databases
├── Third-party Integrations
└── Production Deployment

AI Applications
├── LLM Integrations
├── RAG Systems
├── Embeddings
├── Vector Search
├── AI Agents
└── AI-powered Workflows

Backend & Infrastructure
├── REST APIs
├── WebSockets
├── Redis & Queues
├── Docker
├── CI/CD
├── Monitoring
└── Cloud Deployment

React.js · Next.js · TypeScript · JavaScript · Tailwind CSS

Node.js · Express.js · FastAPI · Django · REST APIs · WebSockets

PostgreSQL · MongoDB · MySQL · Redis · pgvector · RAG · Embeddings · Vector Search · LLM APIs

AWS · Docker · GitHub Actions · CI/CD · Nginx · Prometheus · Grafana

Git · GitHub · Jira · Prisma · Celery · BullMQ

A full-stack e-commerce and service-booking platform built for a tailoring business.

Supports online ordering, service management, customer workflows, and role-based administration.

Stack: Next.js React Node.js Express.js MongoDB Tailwind CSS

🔗 Live Project

A production-oriented corporate CMS platform developed for a UK-based organization.

The system includes a public-facing corporate website, administrative dashboard, content management workflows, role-based access control, SEO functionality, authentication, and a structured REST API.

Stack: Next.js NestJS PostgreSQL Prisma Docker REST API

• Authentication & authorization
• Permission-based RBAC
• PostgreSQL database architecture
• REST API
• Admin CMS
• SEO & sitemap
• Secure HTTP configuration
• Docker deployment
• Production environment configuration

🔗 Live Project

An AI-powered voice interview platform designed for realistic technical and behavioral interviews.

Features include real-time voice interaction, adaptive questioning, resume-aware personalization, AI provider abstraction, structured interview evaluation, and persistent interview data.

Stack: Next.js TypeScript Node.js PostgreSQL Prisma Redis ElevenLabs

🔗 View Project

A self-hosted secrets and environment management platform for securely storing, managing, and auditing application secrets across environments.

Includes authentication, secure secret management, environment separation, audit logging, and real-time application functionality.

Stack: Next.js Python Docker JWT WebSockets

🔗 View Source

• Distributed Systems
• AI Infrastructure
• Large Language Models
• RAG & Agentic Systems
• Backend Architecture
• Cloud Architecture
• Performance Engineering
• Developer Experience
• Observability
• Secure Application Design

• 🤖 AI-powered applications
• 🔎 RAG and semantic search
• 🧠 LLM-based workflows
• ⚡ High-performance backend services
• 🔄 Distributed processing and queues
• ☁️ Cloud infrastructure
• 📈 Observability and monitoring
• 🛠️ Developer tools and infrastructure

I write about software engineering, backend systems, AI, infrastructure, and things I learn while building real products.

📝 Read my engineering blog:
https://www.niranjansah87.com.np/blog

I'm available for:

• Full Stack Web Development
• SaaS Development
• AI-powered Web Applications
• Backend API Development
• RAG & LLM Integrations
• Database Architecture
• API & Third-party Integrations
• Docker & Production Deployment
• Existing Application Development & Optimization

👉 Hire me on Upwork

🌐 Portfolio: https://www.niranjansah87.com.np
📝 Engineering Blog: https://www.niranjansah87.com.np/blog
💼 LinkedIn: https://www.linkedin.com/in/niranjan-sah
🚀 Upwork: https://www.upwork.com/freelancers/~01886e601a463a88bd
📧 Email: niranjansah250@gmail.com

Build systems. Ship products. Keep learning.