You will get Full Stack Developer| SaaS app| React Node.js| Full stack SaaS developer
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Project details
Looking for a Full Stack Developer who can build a scalable web application or SaaS application?
I specialize in Full Stack Development, helping startups and businesses build web applications, SaaS platforms and MVPs that are designed for real users and long-term growth.
As a Full Stack Developer, I handle both frontend and backend development building complete systems using React, Node.js, and modern web technologies.
FULL STACK DEVELOPMENT SERVICES
Full Stack web application development
SaaS application development
MVP development (idea to production)
Frontend development using React / Next.js
Backend development using Node.js / NestJS
Dashboard and admin panel development
TECH STACK
React, Next.js
Node.js, Express.js, NestJS
JavaScript, TypeScript
PostgreSQL, MongoDB
REST APIs, WebSockets
Cloud deployment (AWS)
WHAT YOU GET
Scalable web application or SaaS application
Clean and maintainable code
Production-ready system
Full-stack development (frontend + backend)
If you're building a web application, SaaS application, or MVP, send me a message I’ll help you build a scalable system
I specialize in Full Stack Development, helping startups and businesses build web applications, SaaS platforms and MVPs that are designed for real users and long-term growth.
As a Full Stack Developer, I handle both frontend and backend development building complete systems using React, Node.js, and modern web technologies.
FULL STACK DEVELOPMENT SERVICES
Full Stack web application development
SaaS application development
MVP development (idea to production)
Frontend development using React / Next.js
Backend development using Node.js / NestJS
Dashboard and admin panel development
TECH STACK
React, Next.js
Node.js, Express.js, NestJS
JavaScript, TypeScript
PostgreSQL, MongoDB
REST APIs, WebSockets
Cloud deployment (AWS)
WHAT YOU GET
Scalable web application or SaaS application
Clean and maintainable code
Production-ready system
Full-stack development (frontend + backend)
If you're building a web application, SaaS application, or MVP, send me a message I’ll help you build a scalable system
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, LocalizationWhat's included $50
These options are included with the project scope.
$50
- Delivery Time 2 days
- Number of Revisions 1
- Number of Pages 1
- Design Customization
- Content Upload
- Responsive Design
- Source Code
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SR
Steven R.
Dec 3, 2025
Instagram Api Clean up
Rovshen is very patient and understanding.
MM
MK M.
Sep 25, 2025
Ionic + Angular Developer for RevenueCat & Stripe Integration
We had a great experience working with Rovshen. He successfully implemented the payment system in our app with excellent attention to detail and clear communication throughout the process. He was professional, reliable, and delivered the work on time. We’re very satisfied with the results and would gladly work with him again on future projects. Highly recommended!
About Rovshen
8+Yrs | AI SaaS Engineer & Ex-CTO | Your Long term Technical Partner
100%
Job Success
Kings County, United States - 9:53 pm local time
from LLM architecture to production UI you're in the right place.
I'm a Senior AI Full Stack Engineer with 8+ years of experience designing and shipping
systems that combine deep AI backends with polished, performant frontends.
My stack: Python (FastAPI, Django) · Node.js · Next.js · TypeScript · React ·
LangChain · LangGraph · OpenAI · Claude · Pinecone · PostgreSQL · AWS
─────────────────────────────────────────
WHAT I BUILD
─────────────────────────────────────────
→ AI Full Stack Applications
Next.js + Python backends with real-time LLM streaming, auth, and multi-tenancy
→ RAG & Knowledge Systems
Hybrid retrieval (dense + sparse), reranking, embedding optimization, citations
→ Agentic AI Systems
Tool-calling agents with memory, orchestration layers, and reflection loops
→ Scalable API Backends
FastAPI / Node.js microservices, async pipelines, RBAC, REST & GraphQL
→ Compliant Enterprise AI
HIPAA-ready healthcare AI, FinTech-grade secure backends
─────────────────────────────────────────
PRODUCTION SYSTEMS I'VE SHIPPED
─────────────────────────────────────────
✔ AI clinical documentation agent — HIPAA-compliant, EHR-integrated, in active use
✔ Enterprise RAG platform — hybrid search over structured + unstructured data at scale
✔ AI SEO intelligence SaaS — semantic analysis across billions of documents
✔ Geospatial risk engine — PostGIS + H3 + real-time scoring for PropTech client
✔ Autonomous ingestion agents — schema drift detection, background orchestration
✔ AI marketing SaaS — website and campaign generation from natural language prompts
✔ Secure multi-tenant SaaS — role-based access, audit logging, enterprise deployment
─────────────────────────────────────────
FULL STACK AI — WHAT THAT MEANS
─────────────────────────────────────────
Most AI engineers can't build the frontend.
Most frontend engineers can't architect the AI layer.
I do both — and I connect them cleanly:
- Python AI backend → FastAPI / LangGraph / async inference pipelines
- Node.js middleware → BFF layers, webhooks, queue workers, integrations
- Next.js frontend → Server components, streaming UI, real-time AI interfaces
- Vector + Relational DB → Pinecone, PostgreSQL, Redis, Elasticsearch
- Cloud → AWS (EC2, Lambda, S3, RDS), Docker, Kubernetes, CI/CD
─────────────────────────────────────────
HOW I WORK
─────────────────────────────────────────
I don't prototype and disappear. I take projects through:
Architecture → MVP → Production Hardening → Monitoring → Scale
You get: clean documentation, maintainable code, and a partner who communicates clearly
and moves fast.
─────────────────────────────────────────
LET'S WORK TOGETHER
─────────────────────────────────────────
Send me:
- What you're building
- Your timeline and budget
I'll respond within 24 hours and tell you exactly how I'd approach it.
Core Stack
Next.js Developer, Python, Node.js, TypeScript, React, FastAPI Developer, Django, Express.js
AI & LLMs
LLM Application Development, LangChain Developer, LangGraph, RAG Engineer, AI Agent Architect, Prompt Engineering, Multi-Agent Systems, Fine-Tuning (LoRA/QLoRA), LLM Evaluation, Generative AI, OpenAI API, Claude API, Gemini API
Data & Search
Retrieval-Augmented Generation, Vector Database, Pinecone, Weaviate, Milvus, Semantic Search, Hybrid Search, Elasticsearch, PostgreSQL pgvector
Backend & Infra
REST API, GraphQL, Microservices, Serverless, AWS (Lambda, EC2, S3), Docker, Kubernetes, CI/CD, Async Python, Queue Workers (Celery, Bull)
Domains & Compliance
HIPAA-Compliant Developer, Healthcare AI (HealthTech), FinTech Backend, SaaS Architecture, Multi-Tenant Systems, SOC2, Role-Based Access Control (RBAC)
Long-Tail Phrases
"tool-calling agents with memory", "hybrid dense and sparse retrieval", "real-time LLM streaming", "EHR-integrated AI", "autonomous ingestion agents", "production AI systems"
Steps for completing your project
After purchasing the project, send requirements so Rovshen can start the project.
Delivery time starts when Rovshen receives requirements from you.
Rovshen works on your project following the steps below.
Revisions may occur after the delivery date.
Step 1
Let's chat, or have a discovery call to go over the requirements in detail
Step 2
Performing the requested work