Mihir Panchal
Verified Expert in Engineering
JavaScript Developer
Ahmedabad, Gujarat, India
Toptal member since July 27, 2022
Mihir is a front-end-first full-stack engineer with 7+ years of experience building high-performance web applications using React, Node.js, and modern JavaScript frameworks. He has worked on large-scale platforms such as Disney+ (JioHotstar) and focused on performance, scalability, and user experience. Mihir has also built AI-powered features using large language models (LLMs) and retrieval-augmented generation (RAG) to deliver intelligent, production-ready products.
Portfolio
Experience
- JavaScript - 7 years
- React - 7 years
- Full-stack Development - 5 years
- Node.js - 4 years
- Python - 4 years
- Generative Artificial Intelligence (GenAI) - 2 years
- Amazon Web Services (AWS) - 2 years
Preferred Environment
MacOS, Git, Visual Studio
The most amazing...
...project I worked on was optimizing a high-scale streaming platform, improving performance by over 70% for 160+ million users.
Work Experience
Senior Software Developer |||
Proximity Works
- Built scalable back-end services using Node.js, Go, TypeScript, NestJS, REST APIs, and microservices, covering authentication, validation, error handling, service communication, caching, and high-volume API workflows.
- Developed responsive front-end applications using Vue, JavaScript/TypeScript, HTML5, and CSS3, with reusable components, state management, lazy loading, accessibility, API integration, and front-end performance optimization.
- Designed HLD and LLD for scalable systems, defining API contracts, service boundaries, database models, caching strategies, asynchronous processing, failure handling, scalability needs, and architectural trade-offs.
- Worked with MongoDB, PostgreSQL/MySQL, and Redis for schema design, indexing, aggregation, transactions, query optimization, caching, data access patterns, and troubleshooting performance issues across services.
- Implemented event-driven workflows using Kafka and RabbitMQ, building producers and consumers with retries, dead-letter handling, message processing, delivery controls, and decoupled communication between microservices.
- Containerized and deployed applications using Docker, Kubernetes, and GCP, working with deployments, services, environment configuration, health checks, autoscaling, resource settings, and production-ready cloud workloads.
- Designed high-throughput Go services using Goroutines and Channels, applying bounded concurrency and worker-pool patterns to process parallel workloads without exhausting CPU, memory, or downstream resources.
- Containerized and deployed Node.js and Go microservices using Docker, Kubernetes, and GCP, working with deployments, configuration, health checks, autoscaling, resource management, and production cloud environments.
- Optimized high-traffic services by reducing unnecessary memory allocations, object creation, copying, and GC pressure, improving application throughput, and keeping memory utilization predictable under load.
Senior Full-stack Engineer
Proximity Works
- Built an end-to-end AI-driven content generation platform that transforms user inputs into scripts, visuals, and short-form videos, enabling automated media creation workflows.
- Designed and developed a full-stack AI platform using React with TypeScript, Node.js and Python back end technologies, and vector databases.
- Architected an AI-powered video comprehension platform enabling conversational search and scene-level querying across large video datasets.
- Designed and implemented a RAG-based system to improve semantic search accuracy and contextual understanding of video content.
- Integrated AI-driven content analysis into OTT ingestion pipelines, enabling automated moderation, metadata generation, and enhanced playback controls.
- Delivered production-ready features by combining front-end performance optimization with scalable back-end and AI system design.
- Implemented RAG-based architecture using LLMs and vector search (Pinecone), enabling semantic video search at scale.
- Designed data pipelines and indexing systems for efficient storage and retrieval of large multimedia datasets.
- Focused on performance optimization, caching strategies, and API efficiency for high-load scenarios.
Front-end UI/UX Specialist
Faria Anzum
- Led a complete UI/UX refinement initiative, improving visual consistency and delivering a polished, production-ready interface.
- Translated Figma designs into pixel-perfect React components with precise alignment in layout, typography, and interaction behavior.
- Standardized design systems by resolving inconsistencies across UI elements, improving usability, and visual coherence.
- Collaborated closely with designers to ensure design intent was accurately implemented under tight timelines.
- Delivered a high-quality front-end experience with zero visual regressions during the final product launch.
Full-stack/Front-end Engineer
Clay Inc.
- Designed the end-to-end system architecture, balancing front-end responsiveness with back-end scalability in a distributed environment.
- Designed and implemented back-end services using Node.js (NestJS) and Python (FastAPI), handling complex business logic and asynchronous workflows.
- Developed agentic AI workflows using large language models (LLMs) to automate shipment quoting, scheduling, status updates, and customer follow-ups, significantly reducing manual effort and turnaround time.
- Architected multi-agent AI pipelines where coordinated agents operate with shared context and tools to execute complex workflows autonomously.
- Built scalable RESTful APIs and microservices, ensuring modular, maintainable, and extensible back-end architecture.
- Improved back-end performance and scalability by optimizing MongoDB aggregation pipelines and redesigning data models, followed by migration to Supabase.
- Managed deployment pipelines and CI/CD workflows on AWS, ensuring reliable releases and monitoring for production-critical logistics systems.
Senior Software Developer
Proximity Labs Pvt
- Spearheaded the development of high-performance, scalable front-end systems using React, TypeScript, and modern SPA architecture for a global OTT platform serving 300+ million users.
- Designed and evolved modular front-end architecture (functional components, hooks, and Redux), enabling scalability across multiple teams and features.
- Built high-throughput back-end services using Java, Spring Boot, REST APIs, and microservices, focusing on low latency, fault tolerance, clean service boundaries, and scalable request processing.
- Designed stateless Java microservices for horizontal scaling on Kubernetes, supporting load balancing, health checks, graceful shutdown, autoscaling, and rolling deployments.
- Optimized JVM performance and memory usage by analyzing heap utilization, garbage collection, thread behavior, and object allocation patterns to reduce latency during high-traffic periods.
- Drove Core Web Vitals improvements, achieving 75% faster load time and 73% improvement in LCP, through rendering optimization, code-splitting, caching, and API efficiency.
- Architected seamless frontend-backend integration via RESTful APIs, collaborating closely with back-end teams to improve response times by 30%.
- Designed asynchronous processing pipelines using Go with Kafka/RabbitMQ, separating heavy background workloads from synchronous APIs and improving responsiveness for high-volume user requests.
- Implemented caching with Redis and in-memory strategies for frequently accessed data, reducing repeated database operations and improving response times for read-heavy application workflows.
- Designed services to remain stateless and horizontally scalable, allowing multiple Go instances to run behind load balancers and scale independently based on traffic and resource utilization.
Software Developer
Proximity Works
- Built and optimized 50+ reusable front-end components for Disney+ Hotstar, serving 160 +million users globally.
- Led performance optimization initiatives, reducing load times and improving responsiveness during high-traffic events (e.g., IPL).
- Developed scalable UI features, including infinite pagination and dynamic content rendering for large datasets.
- Diagnosed and resolved critical production issues (Sev 1) within 30 minutes, ensuring minimal downtime.
- Created a robust testing framework for Livingroom platforms, improving stability and release confidence.
- Demonstrated testing framework leadership. Designed and implemented a robust testing framework for Hotstar Living Room platforms, covering four test modules with 40 end-to-end tests to guarantee quality across devices.
Senior Systems Engineer
Infosys
- Developed scalable single-page applications using React and Node.js for a digital banking platform with 3+ million users.
- Built and optimized back-end APIs and improved SQL query performance by 25%, enhancing system efficiency.
- Collaborated with cross-functional teams to deliver features end-to-end, ensuring high-quality releases.
- Involved in query optimization to reduce the overall transaction time by 25% using various joins with Oracle SQL and modified transaction flow from a single stream to a parallel stream.
- Built Node.js/FastAPI endpoints for authentication, transaction processing, and reporting; integrated with the React Native app using Axios and TypeScript-typed interfaces.
- Established end-to-end pipelines using GitHub Actions and Microsoft App Center for automated builds, over-the-air updates, and staged rollouts, streamlining configuration across dev, staging, and production.
- Implemented Sentry for mobile crash reporting and custom analytics events, collaborating with operations to set up alerting and ensure 99.9% uptime for critical banking features.
Systems Engineer
Infosys
- Developed an internet banking application for one of the largest American financial companies, with around 60 million users and $1,295 crores in revenue.
- Designed and developed mass debit, savings, and credit card functionality using React, Redux Thunk, and Context API.
- Translated the Figma design into higher quality code and wrote the application interface code using React.
- Troubleshot the application and debugged the application code to improve functionality and performance by 50%.
- Coordinated with the development team of 35 members to discuss user interface ideas and applications.
- Reviewed the application requirements and interface designs to ensure compatibility with existing applications.
Experience
Netflix AI Assistant Clone
AI-powered Conversational Agent & GenAI Assistant Platform
React and JavaScript Compiler
https://wonderful-shannon-56b47b.netlify.app/e-kart eCommerce
Education
Bachelor's Degree in Computer Science
Gujarat Technological University - Gujarat State, India
Certifications
Certified React Front-end Developer
Udemy
Skills
Libraries/APIs
Node.js, React, REST APIs, Stripe, Stripe API, JSON API, React Router, React Testing Library, API Development, Vue, React Redux, Playwright, OpenAI API, LocalStorage, React Query, D3.js, Claude API, React Navigation, Auth, Redux-Saga, MobX, Firebase Web SDK, Twilio API, Chart.js, React Flow, Socket.IO, Asyncio
Tools
Git, Babel, Shadcn, GitHub, GitLab, GitLab CI/CD, Figma to HTML, Postman, n8n, NPM, Figma, LaunchDarkly, ChatGPT, Prisma, Redux Toolkit, Claude, GitHub CLI, Claude Code, Amazon CloudWatch, AWS IAM, NGINX, Webpack, MongoDB Atlas, Visual Studio, Retool, Sentry, Terraform, AWS Glue, AWS Step Functions, Amazon Simple Queue Service (SQS), Codex, RabbitMQ
Languages
JavaScript, HTML, CSS, TypeScript, Python, Sass, ECMAScript (ES6), HTML5, Java, GraphQL, SQL, CSS3, Ruby, Go
Frameworks
Next.js, Tailwind CSS, Jest, React Native, Vanilla JS, Angular, Express.js, Redux, Material UI, NestJS, Swagger, Django, Spring Boot, Streamlit, Flask, LangGraph, JSON Web Tokens (JWT), Yarn
Paradigms
Agile, Unit Testing, UI Design, Responsive Web Design (RWD), Automation, REST, Code Refactoring, Microservices, Search Engine Optimization (SEO), Role-based Access Control (RBAC), Test-driven Development (TDD), Component-based Development, Testing, UX Design, Database Design, ETL, Real-time Systems, Microfrontends, Model Context Protocol (MCP), DevOps
Platforms
Amazon Web Services (AWS), Firebase, Vercel, Visual Studio Code (VS Code), Docker, Kubernetes, Jupyter Notebook, Amazon EC2, AWS Lambda, Heroku, Google Cloud Platform (GCP), Apache Kafka
Storage
PostgreSQL, Databases, MongoDB, JSON, MySQL, Amazon S3 (AWS S3), Redis, IndexedDB, SQLite, NoSQL, Cloud Firestore, Amazon DynamoDB, RDBMS, Relational Databases, Google Cloud
Industry Expertise
Healthcare, Web Design
Other
Front-end, APIs, Code Review, Full-stack, Web Development, API Integration, Single-page Applications (SPAs), Front-end Development, Large Language Models (LLMs), Over-the-top Content (OTT), ESLint, CSS Animations, Cursor AI, Full-stack Development, FastAPI, AI Agents, Retrieval-augmented Generation (RAG), Responsive Web Apps, Payment APIs, Technical Writing, AI Tools, Platform as a Service (PaaS), RESTFul APIs, Communication, Complex Application User Interfaces (UI), Teamwork, Pixel Perfect, Responsiveness, Web App Development, Component Libraries, Tailwind UI, Startups, Landing Pages, CI/CD Pipelines, Back-end, Supabase, UI Components, WebIDE, Minimum Viable Product (MVP), UI Development, Integration, Responsive UI, SaaS, Axios, Web Applications, Development, AI Programming, React Hooks, LLM Integration, User Interface (UI), WebSockets, Storybook, Back-end Development, Architecture, Front-end Design, Generative Artificial Intelligence (GenAI), Video Streaming, Vite, Artificial Intelligence (AI), Figma to React, ChatGPT API, eCommerce, Browser Automation, Digital Payments, AI Automation, Software, Server-side Rendering (SSR), User Authentication, Machine Learning, Workflow Automation & System Integration, Application State Management, Vector Databases, OpenAI, Mobile App Development, User Experience (UX), Agentic AI, AI Integration, Apollo, Artificial General Intelligence (AGI), AI Chatbots, Cloud Platforms, Content Management Systems (CMS), Data Scraping, Web Security, Prompt Engineering, Middleware, Design Systems, Business Services, Turborepo, Non-relational Databases, UI Testing, Webhooks, AI-generated Code, API Design, Cloud, Gemini API, Relational Database Design, Supabase Auth, RAG Architecture, API Management, Payments, Technical Architecture, Open-source LLMs, Figma Make, Back-end Performance, Systems Engineering, AI-assisted Development, Monorepos, Cloud Architecture, MERN Stack, Source Code Review, Task Analysis, Technical Hiring, A/B Testing, Test Planning, UI Automation, CSS3 Animation, Front-end Architecture, Team Leadership, Mobile Video, Accessibility, GitHub Copilot Chat, Fintech, Cloudinary, OpenAI GPT-4 API, DocuSign, SSG, Amazon Bedrock AgentCore, FAISS, Light LLMs, Pinecone, Deployment, LangChain, Anthropic, Chrome Extensions, Plugins, Security, Cloudflare, Data Visualization, Service Workers, Software Architecture, Radix UI, Design, GitHub Actions, Large-scale Projects, No-code Development, Logistics, Outlook Add-ons, Analytics, Infrastructure as Code (IaC), Community Management, Authentication, Static Site Generators, RAG Pipelines, Scalable Architecture, OAuth, Localization, AWS DevOps, Payment Gateways, RAG Systems, API Gateways, Progressive Web Applications (PWAs), IT Security, UX Thinking, UI Motion, RESTful Microservices
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring