Hire the Best Google App Engine Developers in Mumbai, IN

15 Years Exp | Salesforce & Attio CRM Architect | AI Automation | Enterprise Integrations | CRM & ERP Consultant | Celigo Expert | Electronic Data Interchange (EDI) | EHR I help businesses automate operations, integrate enterprise systems, and build scalable CRM, ERP, and AI-powered solutions that improve efficiency and accelerate growth. With 15+ years of experience, I have delivered enterprise solutions across Salesforce, Attio, Odoo, Healthcare, eCommerce, Marketplace Integrations, and Custom Business Applications for startups, SMBs, and global organizations. My focus goes beyond software development, I help clients design scalable architectures, automate manual processes, integrate disconnected systems, and leverage AI to solve real business challenges. Core Services: • Salesforce Consulting, Customization & App Development • Salesforce Integration & API Development • Attio CRM Implementation & Automation • Odoo ERP Implementation & Customization • AI Agents, AI Automation & Workflow Automation • Enterprise System Integrations & iPaaS (Celigo, Boomi, Make, n8n & Zapier) • Google Apps Script & Google Workspace Automation • Electronic Data Interchange (EDI) • Marketplace Integrations (Amazon SP-API, Walmart, eBay, Amazon Vendor Central, Target dot com, Wayfair) • Healthcare Platforms (EHR, EMR, HL7, FHIR) • Custom ERP, CRM & Business Applications • Web & Mobile Application Development Enterprise Integration Expertise: • Salesforce, Shopify, Odoo, ERP & CRM Integrations • Amazon SP-API, Walmart, eBay & Marketplace Integrations • EDI (850, 855, 856, 810, 846, 997), AS2 & Trading Partner Integrations • REST APIs, GraphQL, OAuth, Webhooks & Custom Middleware • QuickBooks, Xero & Financial System Integrations • AI-powered workflow automation across CRM, ERP and business applications AI & Intelligent Automation: • OpenAI, Claude, Gemini • LangChain, LangGraph, CrewAI • Model Context Protocol (MCP) • RAG Pipelines & Knowledge Systems • AI Agents & Multi-Agent Systems • Intelligent Document Processing • Voice AI & Conversational AI • Workflow Automation with n8n • Twilio, ElevenLabs, Retell AI Technology Stack: • Salesforce • Attio CRM • Odoo ERP • Celigo • Boomi • Java, Spring Boot • Node.js, NestJS • React.js, Next.js • TypeScript • PostgreSQL, MySQL • Docker, Kubernetes • Google Apps Script Industries: • Healthcare • eCommerce & Retail • Logistics & Supply Chain • Manufacturing • Financial Services • SaaS Platforms • Professional Services Why Clients Work With Me: • 15+ years of enterprise software consulting experience • Salesforce Architect with extensive CRM expertise • Strong background in enterprise integrations and API development • Proven experience building AI-powered business automation • End-to-end delivery from architecture and development to deployment and support • Clear communication, reliable execution, and long-term partnership Whether you need Salesforce consulting, Attio implementation, Odoo customization, Celigo Integration, AI automation, enterprise integrations, or a complete web/mobile platform, I can help design and deliver a scalable solution aligned with your business goals. Let's discuss your project and identify the most effective solution for your business.

I build custom Google Sheets & Apps Script systems that turn manual, error-prone spreadsheet work into reliable, automated business tools — dashboards, workflow tools, API integrations, and document-to-sheet pipelines. Recent work: • A Google Sheets sidebar app (custom Vue.js interface + REST API) published live on the Google Workspace Marketplace — replaced a manual financial data-entry workflow that took 15+ hours/month, with sub-2-second API responses. • A Sheets-based quoting system for a sales team, pulling live travel data from Google's Routes API — built with a 5-layer cost-safety system (caching, rate limits, quota caps) after an earlier version caused a runaway API bill. • Automated PDF/document-to-Sheet extraction pipelines in Python, including a benchmark comparing AI (GPT-4o) against dedicated OCR for cost and accuracy on real invoices. What I build: • Custom Apps Script tools — sidebars, dashboards, approval workflows, one-click automations • API integrations — Google Routes/Maps, REST APIs, external data sources • Document/PDF-to-Sheets automation, with AI-assisted extraction where it genuinely helps — not as a gimmick • Excel automation (VBA) for teams not yet ready to move off Excel Tech: Google Apps Script, Google Sheets API, Vue.js, Python (FastAPI, Pandas), REST/Google APIs, Excel VBA, OpenAI/Claude APIs.

Swift Delivery of Your Critical IT Needs 📅18+ Years of Experience ⏰ Full-Time Availability 🌐5189+ projects outside Upwork 🚀Quick Response Time 🕒On-Time Delivery 🛡️Post Contract Support I’m a FULL STACK DEVELOPER specializing in developing various clone solutions and providing services to clients in different regions. I also built mobile app solutions for startups and companies across the US, UK, Germany, Australia, Singapore, Thailand, and UAE. I specialize in social networks, streaming apps, tools & utilities, e-commerce apps, consumer products, and B2B/B2C solutions. Core Competencies: Full Stack Development Mobile App Development (iOS Swift, Android Kotlin, React Native) Front-end Technologies (HTML, CSS, JavaScript) Back-end Technologies (Node.js, Express, PHP, Laravel) Database Management (MySQL, MongoDB) API Integration and Development Responsive Design Cross-platform Development (React Native) "Miracuves Solutions empowers businesses with custom web and mobile applications, acting as your one-stop shop for digital transformation." Our passionate and experienced developers leverage a robust tech stack, including industry-leading frameworks like React and Node.js, alongside versatile databases (SQL & NoSQL) to craft scalable and secure solutions. Why Engage with our Services? Fast & Reliable: We prioritize speed and dependability in every project. Affordable: Our pricing is competitive, without compromising quality. Flexible: We tailor our solutions to meet your unique needs. Punctual: We consistently deliver on time, as promised. Integrity: We deliver exactly what we demonstrate, without hidden fees or subscription-based costs. Let's discuss your business needs! Start a consultation on Upwork to explore how I can create a BEST solution for you.

𝗪𝗮𝗻𝘁 𝘁𝗼 𝘁𝗿𝗮𝗻𝘀𝗳𝗼𝗿𝗺 𝗮 𝗰𝗼𝗺𝗽𝗹𝗲𝘅 𝗽𝗿𝗼𝗱𝘂𝗰𝘁 𝗶𝗱𝗲𝗮 𝗶𝗻𝘁𝗼 𝗮 𝘀𝗲𝗰𝘂𝗿𝗲, 𝘀𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝘄𝗲𝗯 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻? 𝗟𝗲𝘁'𝘀 𝗯𝘂𝗶𝗹𝗱 𝗶𝘁 𝗿𝗶𝗴𝗵𝘁 𝘁𝗵𝗲 𝗳𝗶𝗿𝘀𝘁 𝘁𝗶𝗺𝗲. I am a Senior Full-Stack Engineer with 10+ years of enterprise-grade experience designing, architecting, and deploying robust web platforms. Having spent 6 years engineering high-traffic infrastructure at the world's 2nd largest contextual ad network. I specialize in building systems that handle massive scale, complex database logic, and seamless front-end experiences. Whether you need a ground-up application architecture or a critical performance overhaul, I operate single-handedly as a highly technical partner to bridge your business goals with reliable code. ⚡𝗖𝗼𝗿𝗲 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 & 𝗖𝗮𝗽𝗮𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀: 🔹 𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻: Single-handedly architecting end-to-end web apps, database schemas, and microservices.Front-End Performance: Developing fast, responsive user interfaces using React.js and Vue.js. 🔹 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 & 𝗔𝗣𝗜𝘀: Engineering secure RESTful APIs and server logic with Node.js (Express), PHP (Laravel), and Python. 🔹 𝗖𝗹𝗼𝘂𝗱 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲: Managing deployments, server scaling, and data storage across AWS and GCP platforms. 🛠️ 𝗣𝗿𝗶𝗺𝗮𝗿𝘆 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝘆 𝗦𝘁𝗮𝗰𝗸: 🔸 Languages/Frameworks: JavaScript (ES6+), React, Node.js, PHP, Laravel, Python 🔸 Databases & Caching: MySQL, PostgreSQL, MongoDB, Redis 🔸 Cloud & Devops: AWS, Google Cloud Platform (GCP), Linux Systems, GitHub actions If you are looking for 𝙘𝙡𝙚𝙖𝙣 𝙘𝙤𝙙𝙚, 𝙨𝙩𝙧𝙪𝙘𝙩𝙪𝙧𝙚𝙙 𝙙𝙤𝙘𝙪𝙢𝙚𝙣𝙩𝙖𝙩𝙞𝙤𝙣, and an engineer who treats your business like his own, click the "Invite to Job" button above to schedule a introductory call.

🚀 Looking for an expert to take your project from a raw idea to a successful live launch on the App & Play Stores? You are at the right place. 🏆 TOP RATED DEVELOPER ON UPWORK (100% JOB SUCCESS) I am a full-stack software engineer who doesn't just write code blindly - I sit down with you in 1-on-1 meetings to strategize your entire product roadmap. To guarantee elite-tier engineering and premium results, I take on a limited number of contracts at a time so your platform gets my absolute undivided attention. Partner with me for a 100% Complete, End-to-End Digital Solution. You don't need to juggle separate UI/UX designers, developers or release engineers - I handle everything from the first design sketch to live deployment. 🎯 CORE DELIVERABLES ENGINEERED FOR GROWTH 1. Premium Mobile App Development: Highly optimized, ultra-smooth native apps engineered for flawless responsiveness, real-time features and secure authentication across all screen sizes. 2. Full-Stack Web & E-Commerce: Custom, hand-coded web applications built from scratch with deep SEO-optimized keyword structures to drive organic traffic and actual business conversions. 3. Scalable Cloud Architecture: From deep relational PostgreSQL tables in Supabase to non-blocking asynchronous cloud functions in Firebase, your backend is built to scale natively while keeping data heavily insulated. 💎 WHY MY LAUNCH ECOSYSTEM IS UNBEATABLE 1. Full Apple & Google play Store Access: Fully managed publishing on both platforms, using verified Individual & Organization developer account. 2. DUNS Number Acceleration: Setting up a Google Play or Apple Organization account? I will get your DUNS number issued directly within 3 days to fast-track your corporate verification smoothly. 3. Instant 14-Day Testing Support: I can smoothly handle Google’s 14-day closed testing requirement for your app and help speed up the approval process. If required, bypass assistance is also available for faster deployment. 4. Compliance & Rejection Lifeline: Bulletproof structuralizing of privacy policies, data-safety declarations, and terms of service to bypass store rejections smoothly. 5. Proven Launch History: Successfully compiled, audited, and published 10+ high-performance applications globally. 🛠️ TECH STACKS 1. Mobile: iOS & Android Development, Swift, Xcode, Android Studio, App Store Compliance, Play Store Publishing. 2. Web: Custom Web Applications, E-commerce Marketplaces, Responsive Web Design, SEO Core Engineering. 3. Cloud & Database: Firebase (Firestore, Auth, Cloud Functions), Supabase, PostgreSQL, Strict Security Rules 4. APIs & Payments: REST APIs, Webhooks Automation, Stripe Connected Checkouts, PayPal and all. 🤝 Stop burning startup capital on junior developers who leave you with broken builds and stressful store rejections. Let’s engineer a high-performing digital product that scales your business. 📩 Click the "Message" or "Invite" button right now, and let's hop on a technical discovery call to review your Figma wireframes or project requirements!

👋 Hi, I'm Devendra Kumar — a Mobile App Specialist helping founders, businesses, and developers build, publish, fix, monetize, and grow Android & iOS apps. With 5+ years of experience, I've helped launch 170+ mobile apps for clients across 12+ countries, delivering everything from Flutter development to successful app launches on Google Play and the App Store. I don't just build apps—I help ensure they're approved, policy-compliant, professionally presented, optimized for visibility, and ready to generate revenue. Here's how I can help: 📱 Flutter App Development (Android & iOS) 🚀 Publish Apps on Google Play & App Store 🛠️ Fix Rejected, Suspended, or Non-Compliant Apps 🖼️ Complete Store Listing Creation (Icons, Screenshots, Feature Graphics, Descriptions & Metadata) 📈 App Store Optimization (ASO) 💰 AdMob Setup & Revenue Optimization 🔄 Website to Android & iOS App Conversion (WebView) 🔧 App Updates, Maintenance & Monthly Support 💻 WordPress Website Development Why clients choose me: • 170+ Successful App Launches • Clients in 12+ Countries • 5+ Years of Experience • Policy-First Publishing Approach • Clear Communication & Fast Response Whether you're launching your first app, fixing a rejected submission, improving store visibility, or looking for a long-term app partner, I'm here to help. 📩 Let's discuss your project and build an app that's ready to launch, grow, and succeed.