Next.js developer & systems architect
Sahil
Kargutkar.
Architecting high-scale web platforms, production AI integrations, and sub-second search systems.
Based in Vasai-Virar & Mumbai, Maharashtra, India. Senior freelance software engineer with 6+ years of production experience across enterprise software teams and global client consulting. Available for local and remote freelance engineering contracts, technical advisory, and architectural consulting.
Selected work & case studies
Case Studies & Measurable Outcomes
WanderSouls
Cross-Platform Mobile & AI Microservice
Collaborative AI travel planner in Flutter with Azure .NET Core & FastAPI. Cost-optimized itineraries with live Google Places API (New).
EV Tech Institute
Enterprise Architecture & Performance
Rebuilt architecture to cut latency from 4.2s to 1.1s. Secured top-5 rankings for 12 core keywords; organic traffic doubled within 90 days.
GenerativeSEO
AI Search Visibility Engine
Search visibility platform measuring brand citation share across ChatGPT, Perplexity, and Gemini with actionable growth recommendations.
Specialization
Architectural Capabilities
Full-Stack Architecture & Scale
Architecting robust Next.js and React frontends backed by resilient Node.js APIs, optimized databases, and clean distributed systems.
Production AI & LLM Systems
Engineering custom AI workflows, tool-calling agents, retrieval-augmented generation (RAG), and data-trained conversational interfaces.
Social proof & verified results
Client Testimonials & Verified Recommendations
"Sahil rebuilt our platform on Next.js from the ground up. Our mobile load time dropped from 4.2s to 1.1s, and our monthly student enrollment inquiries more than tripled within 90 days. He solved our drop-off issue completely."
"Sahil is one of the rarest frontend engineers who genuinely understands semantic entity graphs and AI engine retrieval. His structured schema pipelines and sub-second Next.js edge caching took our AI citation share to over 90% on Perplexity."
"Working with Sahil on WanderSouls was a masterclass in cross-platform architecture. His Flutter BLoC implementation combined with FastAPI prompt validation made our collaborative itinerary planner feel instant and bulletproof."
"Sahil is the engineer you bring in when you need zero-downtime migrations, sub-second TTFB, and clean architectural patterns. His Next.js expertise and systems thinking are second to none in the Mumbai developer ecosystem."
Let's build something exceptional
Start a Project or Book a Discovery Call
Fast-Track Direct Communication
Have an urgent requirement, migration, or performance audit? Connect with me directly through your preferred channel.
Tell Me About Your Project
Fill in the details below to receive a scoping outline and accurate price estimate.