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Krunal Shah
Verified Expert in Engineering
Full-stack Developer
Ahmedabad, Gujarat, India
Toptal member since August 2, 2021
Bio
Krunal is a full-stack engineer with 9+ years of experience building systems that scale from zero-to-one MVPs to platforms handling billions of monthly requests. He specializes in Node.js, React, Next.js, and Python, with hands-on experience in LLM integration and AI-driven products. Krunal has delivered solutions across fintech, media, Web3, and AI, and has helped multiple clients raise funding through solid technical execution.
Portfolio
ProperX
Node.js, Next.js, TypeScript, Microservices, Amazon Web Services (AWS), Docker...
Medentry
Next.js, React, React Native, TypeScript, REST APIs, Performance Optimization...
Infynno Solutions
Node.js, React, Next.js, React Native, NestJS, TypeScript, Python...
Experience
- React - 9 years
- Node.js - 9 years
- Microservices Architecture - 7 years
- TypeScript - 6 years
- Amazon Web Services (AWS) - 5 years
- Next.js - 5 years
- Python - 3 years
- LLM Integration - 3 years
Work Experience
Full-stack Engineer
2022 - PRESENT
ProperX
- Architected a multi-feature social platform combining elements of Twitter, Instagram, and Twitch on a Node.js microservices back end.
- Scaled the platform to millions of fans and thousands of creators while managing all DevOps infrastructure end-to-end.
- Built the complete Next.js front end, delivering a performant and polished user experience across web and mobile viewports.
- Led SOC 2 Type II and GDPR compliance efforts across the full platform, coordinating engineering and legal stakeholders.
Technologies: Node.js, Next.js, TypeScript, Microservices, Amazon Web Services (AWS), Docker, Kubernetes, PostgreSQL, MongoDB, REST APIs, DevOps, CI/CD Pipelines, Agora, Twilio, SendGrid, Microservices Architecture, React, Python, Back-end, Terraform, Full-stack Development, API Integration, Claude, Stripe, Stripe API, AWS DevOps, Infrastructure as Code (IaC), Cloud Engineering, SOC 2, Chatbots, Cursor AI, Claude Code, Agentic RAG Systems, Technical Architecture, Cloud Architecture, Software Architecture, Tailwind CSS, AWS IoT, User Interface (UI), AI Chatbots
Front-end Engineer
2020 - 2026
Medentry
- Built the Next.js front end for Australia and the UK's largest medical entrance exam preparation platform, serving hundreds of thousands of students.
- Developed the React Native mobile application, delivering a consistent and performant experience across iOS and Android.
- Consulted on back-end deployment architecture and infrastructure optimizations, improving platform reliability and performance.
Technologies: Next.js, React, React Native, TypeScript, REST APIs, Performance Optimization, Amazon Web Services (AWS), Node.js, Back-end, ECS, Full-stack Development, API Integration, Artificial Intelligence (AI), Stripe, Stripe API, Cloud Engineering, Chatbots, Technical Architecture, Software Architecture, Tailwind CSS, AWS IoT, DevOps, User Interface (UI), Minimum Viable Product (MVP)
Full-stack Engineer
2019 - 2026
Infynno Solutions
- Architected an LLM-powered tax automation platform using microservices on AWS EKS, leading a team of 5 engineers through to a multi-million dollar fundraise.
- Reduced cloud infrastructure costs by 50% for a high-traffic news site while sustaining billions of monthly requests with improved reliability.
- Built and scaled a Norway-based social platform to millions of fans and thousands of creators using Node.js microservices and Next.js.
- Delivered full-stack React Native and Next.js applications for Australia and the UK's largest medical entrance exam preparation platform.
- Architected serverless back-end infrastructure on AWS Lambda and API Gateway for a privacy and consent management platform.
- Led SOC 2 Type II and GDPR compliance programs across multiple international client platforms, coordinating engineering and legal teams.
- Shipped a complete Next.js rebuild of a top-rated NFT trading platform, significantly improving performance, UX, and reliability.
- Built end-to-end NestJS back end, Next.js front end, and React Native mobile app for a Canadian carpooling platform independently.
Technologies: Node.js, React, Next.js, React Native, NestJS, TypeScript, Python, Amazon Web Services (AWS), Amazon EKS, Kubernetes, Docker, Microservices, PostgreSQL, MongoDB, REST APIs, GraphQL, LLM Integration, Serverless Architecture, CI/CD Pipelines, Microservices Architecture, AWS Lambda, Back-end, Terraform, ECS, Supabase, Full-stack Development, API Integration, Cloud Engineering, Technical Architecture, Technical Leadership, Engineering Management, Software Architecture, AWS IoT
Full-stack Engineer
2020 - 2024
Notice Ninja
- Architected a microservices-based LLM platform using OCR to extract and process tax notices, automating resolution workflows at scale.
- Designed and deployed scalable Node.js services on Kubernetes via Amazon EKS, handling millions of notices in production.
- Built the complete React front end, translating complex tax workflows into a clean, intuitive user interface.
- Led a cross-functional team of 5 engineers from architecture through delivery, contributing to a multi-million dollar fundraise.
- Drove SOC 2 Type II compliance program end-to-end, coordinating across engineering, legal, and security teams.
Technologies: Node.js, React, TypeScript, Amazon EKS, Kubernetes, Microservices, PostgreSQL, LLM Integration, Optical Character Recognition (OCR), REST APIs, Docker, CI/CD Pipelines, Microservices Architecture, Amazon Web Services (AWS), Next.js, Python, Back-end, Terraform, Full-stack Development, API Integration, Artificial Intelligence (AI), AWS DevOps, Infrastructure as Code (IaC), Cloud Engineering, SOC 2, Claude Code, React Flow, SaaS, Technical Architecture, Cloud Architecture, Software Architecture, Prompt Engineering, Agentic Workflow Design, AWS IoT, DevOps, Retrieval-augmented Generation (RAG), DocuSign, User Interface (UI), AI Chatbots, AI Architecture, Minimum Viable Product (MVP)
Full-stack Engineer
2021 - 2023
FMT (Free Malaysia Today)
- Upgraded the Next.js front end to the latest version, resolving critical performance bottlenecks on Malaysia's largest multilingual news site.
- Optimized the WordPress back-end and database layer, reducing GCP infrastructure costs by around 50% without compromising reliability.
- Sustained billions of monthly requests post-optimization with improved platform stability and load performance.
Technologies: Next.js, React, WordPress, Google Cloud Platform (GCP), MySQL, Performance Optimization, TypeScript, REST APIs, GraphQL, Node.js, Amazon Web Services (AWS), Back-end, Full-stack Development, API Integration, Google Cloud, Cloud Engineering, Technical Architecture, Cloud Architecture, Software Architecture, Tailwind CSS, AWS IoT, DevOps, User Interface (UI)
Full-stack Engineer
2019 - 2019
Magic Technolabs
- Contracted with US-based clients to design and deliver full-stack web applications end-to-end, independently managing architecture and delivery.
- Built a freelance marketplace from scratch using Node.js and React, covering platform architecture, API design, and front end.
- Advised US-based clients on AWS infrastructure and scalable back-end architecture across multiple concurrent remote engagements.
Technologies: Node.js, React, JavaScript, REST APIs, Amazon Web Services (AWS), System Architecture, Full-stack Development, Software Consulting, Next.js, Back-end, API Integration, Cloud Engineering
Software Engineer
2017 - 2019
Rayvat
- Built and launched a US-based secondary ticket marketplace end-to-end, independently architecting the Laravel back end and front end as a junior engineer.
- Developed and maintained multiple client-facing web products using Laravel and CodeIgniter for international outsourced engagements.
- Gained strong foundations in RESTful API design, MVC architecture, and agile delivery workflows across diverse international client projects.
Technologies: PHP, Laravel, MySQL, JavaScript, jQuery, REST APIs, CodeIgniter, PHP MVC, React, Node.js, Amazon Web Services (AWS), Back-end, Full-stack Development, API Integration, Cloud Engineering
Project History
AI-powered Cybersecurity Intelligence Platform
I led architecture, cloud deployment, and front-end development of an AI-driven cybersecurity intelligence platform. I also contributed to technical positioning and roadmap, helping the team secure their seed funding round.
Top-rated NFT Trading Platform Rebuild
I delivered a complete rebuild of one of the highest-rated NFT trading platforms during the height of Web3 adoption. The existing platform had significant performance bottlenecks and UX issues that were impacting user retention and trading volume. I rebuilt the entire front end using Next.js, overhauling the component architecture, optimizing rendering performance, and redesigning key user flows to improve the trading experience. The rebuild significantly improved page load times, platform reliability, and overall UX, helping the platform maintain its top-rated status during peak Web3 market activity.
Serverless Privacy & Consent Management Platform — XCooBee
I developed serverless back-end infrastructure for a privacy and consent management platform, implementing AWS Lambda functions and API Gateway integrations to handle consent workflows, data privacy operations, and regulatory compliance at scale.
Freelance Marketplace Platform - GigHub
I built a Fiver-style freelance marketplace from scratch for US-based clients using Node.js and React, independently handling platform architecture, RESTful API design, database modeling, and complete front-end implementation.
US-based Secondary Ticket Marketplace - TixBag
As an early-career engineer, I independently built a US-based secondary ticket marketplace from scratch, designing and delivering the entire platform. I architected the Laravel back end to handle ticket listings, inventory management, order processing, and user authentication. On the front end, I developed a jQuery-powered interface covering browsing, search, and checkout flows. I managed database modeling, RESTful API design, and deployment, gaining strong foundations in full-stack architecture, MVC patterns, and agile delivery. The result was a production-ready marketplace tailored for the US market.
Yonder
Yonder was an outdoor travel and adventure discovery platform that enabled users to discover destinations, explore outdoor experiences, and share their adventures through web and mobile applications. I implemented Segment and Mixpanel analytics across the web and React Native apps to track user behavior and understand the complete user journey. I designed event tracking, funnels, and reports to identify where users dropped off across key product flows, analyzed behavioral data to uncover usability and engagement issues, and helped implement improvements based on those insights.
Zvoid
Zvoid is a production and software development company that creates digital content, applications, and games for a global audience. I built an internal operations platform with dashboards and management tools to help the team monitor key business activities, centralize operational data, and improve internal workflows. I was responsible for developing the platform and implementing the dashboards and features used by the team to manage and track their day-to-day operations.
Education
2012 - 2016
Bachelor's Degree in Computer Engineering
Gujarat Technological University - Gujarat, India
Certifications
JULY 2026 - JULY 2027
Claude Certified Architect Foundations
Anthropic (Claude)
Skills
Libraries/APIs
React, Node.js, Stripe, API Development, REST APIs, Stripe API, Chart.js, React Flow, Rollup.js, jQuery, Vue
Tools
Git, Amazon Elastic Container Service (ECS), Amazon Elastic Container Registry (ECR), Amazon Simple Notification Service (SNS), Amazon ElastiCache, Claude Code, Claude, WebStorm, Terraform, Auth0, GitHub, GitHub Pages, NPM, Coveralls, Amazon EKS, Agora, SendGrid, Claude Agent SDK
Languages
TypeScript, GraphQL, JavaScript, PHP, CSS, Python, HTML
Frameworks
Laravel, React Native, Next.js, Express.js, NestJS, Tailwind CSS, Cypress, CodeIgniter, PHP MVC
Paradigms
Microservices Architecture, Agile, REST, Microservices, Model Context Protocol (MCP), E2E Testing, DevOps, Serverless Architecture, Test-driven Development (TDD), Management, Web UI Design, Refactoring
Platforms
Amazon Web Services (AWS), Docker, MacOS, Linux, Windows, AWS Lambda, Amazon EC2, Firebase, AWS IoT, Kubernetes, Apache Kafka, Google Cloud Platform (GCP), WordPress, Twilio, iOS, Android, Webflow CMS, Mixpanel
Storage
MySQL, MongoDB, PostgreSQL, Amazon S3 (AWS S3), Redis, Google Cloud
Industry Expertise
Travel & Leisure
Other
Front-end Development, Amazon API Gateway, Code Review, API Integration, Back-end, Software Architecture, Engineering Management, Cloud Architecture, Technical Leadership, Technical Architecture, SaaS, Agentic RAG Systems, Agentic AI, RAG Architecture, Cursor AI, Chatbots, Supabase, SOC 2, LLM Integration, CI/CD Pipelines, Full-stack Development, ECS, Artificial Intelligence (AI), AWS DevOps, Infrastructure as Code (IaC), Cloud Engineering, Prompt Engineering, Agentic Workflow Design, Retrieval-augmented Generation (RAG), DocuSign, User Interface (UI), AI Chatbots, Anthropic, Minimum Viable Product (MVP), Progressive Web Applications (PWAs), Large Language Models (LLMs), LangChain, FastAPI, AI Architecture, AI Agents, Generative Artificial Intelligence (GenAI), PWA, ESLint, Storybook, Segment, System Architecture, Software Consulting, Optical Character Recognition (OCR), Performance Optimization, Fine-tuning, AI Integration, Third-party APIs, Large-scale Data Processing, Web3, General Data Protection Regulation (GDPR), Maps, Marketplaces, Markets, Customer Data
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