Hire the Best CSS3 Developers in Santa Clara, CA

Hi! I'm Mansi, a Web Developer & Designer based in the US, California, with 6 years experience in Backend and Frontend development. Each website I develop focuses on capturing a specific audience's attention and keep them engaged. I'm a quick learner and have extensive experience in : PHP Framework - CodeIgnitor JS Framework - React JS CMS - WordPress Core Skills: PHP, Javascript , HTML5, CSS3, Bootstrap4 Let me know if you have any questions! I'm happy to help. I look forward to working with you!

As an Upwork Expert Vetted Silicon Valley Engineer I am among the top 1% talent on Upwork. I have a Job Success Score of 100% which means, every client has been fully satisfied with my services. With over 10+ years of experience as a Senior Software Engineer, I have had the unique opportunity to work in very diverse roles. I have built products from the ground-up and helped scale them for planetary scale. I have worked for companies in Silicon Valley, Boston, New York City and other tech centers around the world. I have worked with companies and teams of all sizes, from Fortune 100 companies to exciting startups. I have in-depth experience of developing large scale web and mobile applications using lean and agile methodologies. Technology Stack: • Backend - Python, Node.js and Java Spring Boot • Web Frameworks - React JS, Angular and Vue • Mobile Development - React Native • Databases - Majority of the Relational and NoSQL Databases. MySQL, PostgreSQL, MongoDB, Cassandra, Yugabyte to name a few. • Cloud - AWS, Azure and Google Cloud

I provide consulting and software development for Google Workspace (Sheets, Forms, Apps Script), Desktop apps, and applications that run in the browser. Let's Chat! I prefer video calls so we can better communicate and quickly get to what you are looking for. Select Projects Custom quoting application in Google Sheets and Apps Script for multiple home remodel companies (the construction and wholesale building materials industries) - Resulted in quotes being sent out in hours instead of days (their salespeople loved it), allowing them to get their quotes to leads ahead of their competitors and closing more sales. Custom Google Sheet for an HVAC company - Created a template Google Sheet for their business specific quoting process and automated it with formulas and scripts, cutting down work and allowing them to send quotes out faster compared to their previous paper method. QR code inventory manager in Google Sheets and Apps Script - Created for a client to manage their inventory list with QR codes, and using a web application that runs on their phone, scan QR codes and manage their inventory right from their phone. Used by a regional soda distributor, amongst others. I have worked with entrepreneurs and small businesses and I was the lead architect and programmer for the SaaS product engage-ai.co. What I can do for you * Create custom quote, project management, and sales order software in Google Sheets or as a custom web application to fit your business processes * Make your Google Sheets more automated, making your team more productive * Move your existing desktop software to a cloud based custom web application to fit your unique business processes * Connect your business' various software to help your team keep on top of customer and project changes

Staff Engineer & Architect | Hands-On Leader | React, Node.js, Java, Microservices Need an architect who doesn't just design systems but actually builds them? I'm Usman, and I'm not your typical engineering leader who's stepped away from the keyboard. Over 20 years, I've stayed hands-on—writing code, architecting systems, and leading teams at companies like Intuit, Carta, and Oracle. I believe the best leaders code alongside their teams. What Makes Me Different: 💻 Hands-On Technical Leader I don't just delegate—I architect, code, and deploy production systems myself Led microservices migration at Carta while personally implementing the core service extraction Built Intuit's API Orchestrator and contributed directly to critical components At DealCart, I architected AND helped build the entire ecosystem from consumer apps to warehouse management 🏗️ Architecture & Systems Expertise Successfully broke Carta's monolith into microservices (solved a 2-year problem in months) Designed Intuit's Webhook System processing 35-40 million events daily Expert in distributed systems, fault tolerance, and scalability Reduced MySpace IM load time from 15 seconds to under 3 seconds while cutting 60% of code 👥 Team Building & Mentorship Grew DealCart's engineering team from 1 to 20 engineers Founded mentorship program at Carta as Staff Engineer I code WITH my team, not just for them—leading by example My Technical Stack: Backend: Java, Node.js, Python, Spring Boot, Kafka, ActiveMQ, Microservices Frontend: React, Redux, HTML5, CSS3, JavaScript (I build UIs too) Cloud & DevOps: AWS, Jenkins, CI/CD pipelines Databases: MongoDB, Cassandra, SQL Server, Oracle Architecture: REST APIs, SOA, Distributed Systems, GraphQL Mobile: iOS (Objective-C, Swift), Android What I Can Do For You: ✅ Architect & Build - I design the system AND write production-ready code ✅ Rescue Legacy Systems - Modernize monoliths, fix performance issues, eliminate tech debt ✅ Scale Your Architecture - Build systems that handle millions of requests ✅ Mentorship & Code Reviews - Level up your team while delivering features ✅ Full-Stack Development - Backend services to React frontends—I do it all My Approach: I start by understanding your business goals, then I roll up my sleeves and build the solution. You get strategy AND execution from one person. Whether you need someone to architect your microservices migration or jump into your React codebase and ship features, I'm equally comfortable. Ready to work with a technical leader who actually codes? Let's discuss your project. I bring 20 years of experience, but I'm still shipping code every week.