I hold a Master of Science in Computer Science from the Illinois Institute of Technology and a Microsoft Certified Developer credential. Over 12+ years, I've partnered with reputable US-based clients to architect and deliver web and mobile applications, ecommerce platforms, backend systems, and AI-powered solutions that support real business operations across industries — on time, on budget, and built to last. When mid-size and enterprise teams need a senior developer they can trust with complex, high-stakes projects — they hire me. What I do best: - .NET, PHP Python full-stack development — robust, secure, and enterprise-grade - Mobile app development (iOS & Android) from concept to launch - API design, development, and seamless third-party integrations - SQL Server & MySQL — database architecture, optimization, and performance tuning - AI & machine learning integration — intelligent features built into real products - Legacy system modernization, code audits, and architecture consulting - Full product lifecycle ownership: architecture → development → testing → deployment across Windows, Linux, and Mac environments Need more than one developer? I can provide a dedicated team of experienced developers and project managers for end-to-end delivery — giving you agency-level capacity with senior-level oversight, accountability, and a single point of contact you can trust. Who I work with: Mid-size and enterprise teams who need a technically strong, communicative partner — not someone they have to babysit. Whether you're scaling an existing platform, modernizing a legacy system, integrating AI into your product, or building something from the ground up, I bring the experience and leadership to move fast without cutting corners. Why clients keep coming back: I don't just write code — I bring product thinking, technical leadership, and a genuine investment in your business goals. I ask the right questions upfront, communicate proactively, flag risks before they become expensive, and deliver consistently. My clients value long-term partnerships, not one-and-done transactions. Got a project in mind? Send me a message and I'll get back to you within a few hours.

- Certified in APIs of Fedex, UPS (SurePost, Quantum View), Purolator, USPS carriers - GWO (Global Wind Organisation) Integration - MercuryGate TMS Integration - Webhook setup - Dxf Automation - Custom integration with LMS's like Canvas, Litmos, Absorb, Coassemble. - Fulfillment and Shipping integration of Shopify and WMSs - Detrack Integration - SendInBlue Email setup - Full stack custom web-apps - API integration (REST/SOAP/oAuth2.0) - Zebra/Dymo printing - Data migration between systems. (CRMs, EDI)

Over 20 years of experience in planning, developing and implementing various information technology and CRM solutions across Institutions.  Salesforce Certified Administrator. •Over 5 years of implementing customized CRM solutions to various clients like Verizon, Allianz Re-Insurance . •Automated Service, Sales and marketing processes using Salesforce Lightning flows, AI Agentforce and APEX/Visualforce • Implemented core Salesforce modules like Sales, Service, Financial, Health cloud for small businesses using Agile/Scrum methodologies • Integrated Salesforce with apps like Zoom, RingCentral, Box, Gmail using Zapier • Utilized Webservices/REST API to integrate Salesforce with third party applications. • Implemented Web to Lead, Web to Case and Email to Case channels. • Created OMNI Channel and Web Chat for customer service. • Built reports and dashboards to measure kpis. • Imported data into Salesforce using tools like DataLoader and workbench. • Implemented and created the full life cycle process for large-scale software development • Identified architectural improvements resulting in increased product reliability and responsiveness to new feature requests • Utilizing strong functional knowledge to drive product design • MS (Computer Science) , University of South Carolina, Columbia  Salesforce Certified Administrator  Sun Certified Programmer for Java 2 Platform  Sun Certified Web Component Developer for Java 2 Platform  Sun Certified Business Component Developer for Java 2 Platform  Project management for IT Profession TECHNICAL SKILLS • Java, J2EE, Java Servlets, JSP, JNDI, JFCs, EJB’s, Java Script, AJAX, Web services • Spring Webflow 2.5, STRUTS, Google Web Tool Kit, XML, XSL, ASP, .NET, Shell Scripts, JUnit • WebSphere 8.5, Tomcat, Web Logic 6.0, IIS, Silver Stream App Server, JRun, JWS • RAD 7.5, Eclipse, Visual Studio, JDeveloper, CVS, Clear Case, Stash, UML, Rational Rose • Oracle 11g, D2000, IBM DB2, MYSQL, MS SQL SERVER, MS ACCESS, Toad • Windows XP, IBM AIX and Unix (SUN SOLARIS 5.7), Silver Stream e-portal 2.2 • JIRA, Confluence, Cloud Services (PaaS), SalesForce Administration, APEX, Visualforce, LWC, AI Agentforce

A 100% refund if I set the wrong expectation and can’t deliver. No excuses, no questions asked! - Top Rated Freelancer - Certified Developer with 5+ Years of Experience - 100% Customer Satisfaction - Upwork Certified I'm Aman Chauhan, I specialise in full stack development. Involved in solution designing, developing, deploying, testing, and debugging of large-scale applications I proficiently utilize AI tools such as v0.dev lovable.app, Bolt.new, CursorAI, Cursor, GitHub Copilot, Devin AI, and AutoDev My Tech stack: ------------------ ✅ Client Side: -React Js, Next Js, Typescript, MUI Components, Ant design Components, jQuery, Bootstrap, tailwind css, HTML5/CSS3, UI/UX, Media Queries, Sass, Wordpress , Gsap, Three js ✅ Backend: -Node Js, Next Js, Web API, JWT, OAuth, GraphQL ✅ DevOps/Cloud/Microservices: -Docker , Kubernetes, AWS (EC2, EKS, ECS, VPC, S3, API Gateway, Lambda) -Git Actions , Jenkins, CI / CD , Serverless, Terraform, API Gateway, Load Balancers ✅ Data Stack: -AWS Dynamo DB, SQL Server, PostgreSQL, My SQL, MongoDB, Firebase, Supabase ✅ Software Engineering: -Agile Methodologies (Scrum) -Project Management: JIRA -Version Control: GitHub -Collaboration and Workflow optimisation ✅ Integrations: -OAuth Providers: OAuth, Auth0 -Social Media APIs: Facebook API, Google API, Instagram API, Youtube API, -Payment Gateways: Paypal API, Stripe API -Communication: SendGrid, Sockets.io -Data Visualisation: High Charts, jQuery Data tables -n8n integration form workflow automation using AI ✅ Other Expertise: -XSLT, XML/JSON parsing, Git, Figma to Code, Postman, Testing with Jest & React Testing Library WHY HIRE ME? ✅ 100% Job Success rate ✅ Diverse Portfolio: E-commerce, Business Websites, Custom Solutions, Scalable APIs - I've done it all. ✅ 90+ Clients Across Various Platforms ✅ 5+ years of experience 🏆 Reviews and feedback from high-profile clients 🏆 The client reviews below (also in my work history section) describe the quality of work and value that you can expect from working with me. ⭐⭐⭐⭐⭐ "Aman was extremely helpful and understanding. He initiated a quick call to clarify the details of the requested task and was efficient in completing the task and providing necessary updates." ⭐⭐⭐⭐⭐ "I want to express my sincere appreciation for Aman’s exceptional XSLT programming. His technical expertise, effective communication, and timely delivery significantly contributed to our project’s success. Highly recommended!." ⭐⭐⭐⭐⭐ "Smart guy works hard. Reliable. Would advise you to work with him for all your dev needs." Let's connect to discuss how I can help you achieve your goals! =======================================================================

Passionate full stack developer with more than 17 years of experience in designing, developing, and supporting software projects. I love to take up challenges and convert them into opportunities and achievements for our clients.   I have great experience in building small and big distributed high load applications. I can create high-quality and stable applications using new technologies. Technical skills: • C#, ASP.NET, VB.NET, MVC 5, .NET Core 2/3/5,Blazor • Entity Framework 4.6+, NHibernate, ADO.NET, Linq to Sql,Dapper • MS SQL Server 2005 - 2017, Oracle, Mongo, Cosmos db, MSSQL Compact • VisualStudio 2017-19• WCF, NServiceBus • Telerik, Devexpress, Kendo UI • Visual Studio 2019, ASP.NET Core 3.1 • JavaScript, jQuery, KnockoutJS • Angular JS, React JS • HTML5, XML, XSL, Bootstrap   • Agile, Scrum, TDD Database: -SQL Server,MySQL,Oracle,MongoDB - Designing database - Indexing Strategies and optimization - Table partitioning - SQL Server Integration Services (SSIS) - SQL Server Analysis Services (SSAS) - SQL Server Reporting Services (SSRS) - MySql- MS Access • Issue management tools: Team Foundation Server, Atlassian-JIRA, and ConnectWise • Excellent code reviews and code Debugging skills. • Windows applications in C# • Send automated mass emails using SendGrid and Onesignal with asp.net core on demand and run as batch Source Control: * Git * Team Foundation Server (TFS) * SVN * Bitbucket

More than 21 years of experience on Java/JEE, PHP, C, C++, Perl, Shell Script, JavaScript MySql and Oracle technologies. An experienced Software Engineer/Architect with having strong R&D[Research & Development] background. Enjoy working on research based development, creating API/SDK, application framework and performance engineering, testing, code profiling, code optimizing, query optimizing, team and project managing. Experienced in designing Cloud computing/service, Semantic web, Sensor network, Ontology, SSO/Identity management, Asynchronous architecture, Mobile based App[Android] Data collector[xForm], Asterisk[AMI/AGI] based interactive IVR application, mHealth, e-Education, disaster and early warning system, Courier & Freight Software, Warehouse & Retail Supply Chain Software, Corporate Mailroom Software, Travel Software, Billing software and Web Bot. Wide and deep knowledge in Java/JEE Technology & OOP Architecture, REST/RESTful architecture, design patterns. Experience in Business intelligence and Reporting Tool. Workflow and BPMS. RDBMS. Solid background in Object-Oriented analysis and design UML, Design Patterns, Architecture Patterns and Software development methodology (Agile/SCRUM/TDD). Technical experienced on Java/JEE, EJB3.0, Spring, Hibernate, JPA, JSF, RichFaces , PrimeFaces Wicket, Struts, DWR, GWT, AngularJS, PhantomJS, Android, HTML, CSS, JS, jQuery, JAX-WS, JAX-RS, SOAP, Maven, Gradle, Jenkins , CloudBees, Google App Engine, Amazon AWS, jBPM , ESB, Node.js ,MySQL, ORACLE, PostgreSQL, SQL Server, MongoDB etc My preference to work on long term project. It could be hourly or fixed price job but hourly job is my first preference. I would like to maintain trustworthily long term relationship through good work. If anyone is there on the same page and match my criteria please poke me for further... More details about technical skills --------------------------------------------------------------------- Programming Languages: J2EE/J2SE/J2ME, Scala, JRuby, C/C++, Assembly, HTML/HTML5 /DHTML/ XHTML, JavaScript, Ajax, XML/XSL, PHP, Android. Frameworks & Toolkits: Spring, EJB3.0, JPA, Hibernate, S2Dao, S2Hibernate, Seasar, JSF, RichFaces, PrimeFaces, Wicket, Struts, DWR, SWT, GWT, Facelets, MIDP 2.0, JavaRosa, Smarty, ADODB, Yii, CodeIgniter, Laravel, Node.js, Dojo, jQuery, AngularJS, PhantomJS. GUI's: SWT, Eclipse RCP & RAP, JFace, Swing/JFC, AWT, JavaDesktop, Java2D, JGoodies. Databases: Oracle, MYSQL, PostgreSQL, MongoDB, SQL Server, JavaDB, FireBird, HSQL Template Languages: Apache Velocity, Handlebars, Nunjucks Build and Logging Tools : Apache Ant, Maven, Gradle , Jenkins , Log4j, gulp, Liquibase Application Servers: Glassfish, Tomcat, WildFly, WebLogic, Jetty Testing Tools: Selenium, JUnit, EasyMock, Mockito, Mercury LoadRunner, JMeter, BlazeMeter. XML's: XML (Dom, Xerces), XPath, Schema, XSD, RDF, Xform (openrosa & javarosa). Workflow (BPMS) & ETL: jBPM, Kettle, Talend. Business Intelligence & Reporting Tool: Eclipse BIRT, Pentaho, JasperRepors. IDE's: Eclipse, NetBeans, IntelliJ, MyEclipse Project Management Tools: SFEE (Source Forge Enterprise Edition), Subversion, Mylyn, Version One, Target process, JIRA, WorkFront, Asana, Redmine, CVS, SVN, GIT, Marcural Methodologies: RUP, Agile, XP, Scrum Operating Systems: Sun-Solaris-x86(10), Linux Family (Redhat/obuntu/Suse), Windows Family (NT/XP/98/2000/2003, vista).

20+ years. Dozens of products shipped. One consistent focus is building systems that don't break when your business grows. If you're a founder or product team looking for a technical lead who can guide decisions, not just execute tasks, that's exactly what I do. I work with startups, scale-ups, and established businesses to take ideas from early concept through to stable, scalable products. Whether that's an MVP you need to validate quickly, a mobile app ready for real users, or a SaaS platform built to grow, I stay closely involved on the technical side while keeping the broader product direction on track. 𝗪𝗵𝗮𝘁 𝗺𝗮𝗸𝗲𝘀 𝘁𝗵𝗶𝘀 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 Most developers will build what you ask for. My job is to make sure what we build is the right thing and that it won't need a full rebuild when your user base grows or your requirements change. That means asking the right questions early, flagging trade-offs before they become expensive problems, and making sure every technical decision connects back to your business goals. 𝗪𝗵𝗮𝘁 𝗜 𝗯𝘂𝗶𝗹𝗱 • Mobile Applications - iOS, Android & Cross-Platform • Full-Stack Web Applications & SaaS Platforms • AI Features & LLM Integrations (RAG, chatbots, OpenAI, Claude, semantic search) • MVP Builds from idea to working product, fast • API Development & Third-Party Integrations • Backend Architecture built for scale • Technical Strategy & Product Planning for founders 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 𝗜'𝘃𝗲 𝘄𝗼𝗿𝗸𝗲𝗱 𝗶𝗻 Healthcare & Mental Wellness · Fitness & Sports · Real Estate · Freight & Logistics · Education & E-Learning · Food & Beverage · Financial Services · Social & Community Platforms Each of these industries comes with its own operational and technical challenges. Having worked across all of them means I can move faster, ask better questions, and avoid the mistakes that slow teams down. 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸 I value long-term collaboration over quick handoffs. Many of the clients I've worked with have stayed through multiple development stages, because when a team understands your product deeply, the work gets better and faster over time. My working style is direct and transparent. You'll always know where things stand, what decisions are coming, and why I'm recommending what I am. No technical jargon for its own sake, just clear communication that keeps the project moving. 𝗛𝗼𝘄 𝗺𝘆 𝘁𝗲𝗮𝗺 𝗶𝘀 𝘀𝗲𝘁 𝘂𝗽 (𝗳𝘂𝗹𝗹 𝘁𝗿𝗮𝗻𝘀𝗽𝗮𝗿𝗲𝗻𝗰𝘆) I am based in India, where I lead a development team I have built and managed over the years (Differenz System Pvt. Ltd). We also run a US entity, Differenz System LLC, and my partner Drishti C. in Los Angeles is your US-based point of contact when you prefer someone in a US time zone. You get a US business and US-hours communication when you want it, plus a senior, hands-on tech lead (me) and the delivery capacity of a full team behind the build. Every team member works under my direct supervision, and I remain your primary technical lead throughout. 𝗔𝗜 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀 𝗜 𝗯𝘂𝗶𝗹𝗱 𝗳𝗼𝗿 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 I build production AI into web and mobile products: LLM and RAG pipelines (OpenAI, Claude, Gemini), chatbots and AI assistants, semantic and natural-language search, AI document processing and OCR, and recommendation engines. Shipped examples include Food Check AI, CLNSD, and Quick Payable (AI document automation). Every AI feature is built for real-world reliability, with output validation and human-in-the-loop review where the stakes are high, not a demo that breaks in production. 𝗔𝗜-𝗔𝘀𝘀𝗶𝘀𝘁𝗲𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 I use AI tools like Claude as part of my development workflow. Not as a shortcut, but as a way to move faster without cutting corners. In practice, that means using AI to accelerate repetitive groundwork, explore approaches quickly, and pressure-test logic, while every piece of code that goes into a production system is reviewed, understood, and validated by me before it ships. I don't copy code blindly. AI handles speed. Experience handles judgment. The combination means you get faster delivery without the hidden technical debt that comes from unreviewed, auto-generated code. 𝗟𝗲𝘁'𝘀 𝘁𝗮𝗹𝗸 𝗮𝗯𝗼𝘂𝘁 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 If you're building any of the following, I'd like to hear about it: • A mobile app: iOS, Android, or cross-platform • A SaaS product or startup MVP • A scalable web application or backend system • A platform that's grown beyond its original architecture Send me a short brief describing what you're building and where you're stuck. I'll review it and come back with honest thoughts on approach, timeline, and what to watch out for.

Hi, I'm a UI/UX Designer with 12+ years of experience, passionate about crafting user-focused digital products. From research and wireframes to polished interfaces and interactive prototypes, I handle the full design cycle with a strong focus on usability and clean, intuitive design. I've successfully collaborated with CEOs, product managers, developers, and cross-functional teams, as well as led solo projects — thriving in roles where clear communication, initiative, and smart decisions drive results. Design Expertise: UI/UX Design Mobile & Responsive Design Prototyping & Interaction Design User Flows & Journey Mapping UX Audits & Reports Wireframing Design Systems & Style Guides Tools I Use: Figma Sketch Adobe Photoshop Basic Front-End Skills: HTML CSS Responsive Layouts Let’s connect if you're looking for a detail-oriented designer who blends strategy with style. Happy to chat!

🚀 𝗔𝗩𝗔𝗜𝗟𝗔𝗕𝗟𝗘 𝗧𝗢 𝗦𝗧𝗔𝗥𝗧 𝗧𝗢𝗗𝗔𝗬! Top Rated Plus Python Full stack developer I help startups and product teams bring backend heavy, modern web applications to life. My work spans from product ideation and architecture to automation, AI integration, and ongoing performance tuning. My stack includes Python (FastAPI, Django, Flask), React, Next.js, NestJS, PostgreSQL and AWS, enriched with scalable data pipelines, monitoring, and automation tools. With over 9+ years of experience and a 100% Job Success Score, I’ve led and delivered more than 40 web apps and five large-scale platforms with high concurrency. ✅ A tech Partner from Architecture to Deployment. Clients work with me because I don’t just code features, I architect scalable, cloud native systems that require minimal oversight. ✔️ Backend: Python, FastAPI, Django, Flask, NestJS, REST APIs, PostgreSQL, MongoDB, Redis ✔️ Frontend: Next.js, React, Tailwind CSS, SSR/CSR, reusable UI libraries ✔️ Cloud: AWS (Lambda, EC2, S3, Step Functions), Docker, GitHub Actions ✔️ Automation & AI: OpenAI API, Langchain, LLM, Make, Zapier, n8n, RAG Agents, AI Agents, Generative AI I’ve also led and mentored engineering teams up to 45 developers, helping deliver across sprints while balancing performance, timelines, and quality. 🏆 Highlighted Work & Outcomes ✔️ Frontend Engineering (React + Next.js) Built fully responsive interfaces using React and Next.js, optimizing for performance and API sync with FastAPI based backends. ✔️ Scalable API Infrastructure (Python, FastAPI) Refactored a high-load backend to handle massive traffic spikes using FastAPI, Redis caching, and PostgreSQL. Supported mission-critical uptime for end users. ✔️ Retention-Driven Feature Delivery. Built backend features that improved session time and user retention in a high-growth mobile app com, bining Redis-based response optimization with async jobs. ✔️ AI Feedback Engine with OpenAI API. Built a GPT-driven evaluation engine for a learning platform. Reduced manual grading efforts and added dynamic feedback for students. ✔️ Cloud Automation & ETL Pipelines. Designed serverless pipelines using AWS Lambda and Step Functions to transfer and transform millions of files with isolated, scalable logic. ✔️ Monitoring & SLA Tools Integrated ELK stack, Grafana, and PagerDuty into production systems to track uptime, detect anomalies, and support SLAs for enterprise clients. 🎯 Technical Stack & Core Skills ✔️ Languages & Frameworks Python, FastAPI, Django, Flask, Node.js, JavaScript ✔️ Frontend Next.js, React.js, TailwindCSS, PWA, SSR/CSR ✔️ Backend & Databases RESTful APIs, OAuth2, PostgreSQL, MongoDB, Redis Celery/RQ task queues, ETL pipelines, and background jobs ✔️ Cloud & DevOps AWS Lambda, EC2, S3, Step Functions, EventBridge, CloudWatch, Supabase Docker, GitHub Actions, CI/CD pipelines ✔️ Automation & AI OpenAI API, Langchain, GPT-4/4o, Prompt Engineering RAG pipelines, Agent flows, n8n, Zapier, Make com, Webhooks, Gen AI ✔️ Monitoring & Performance ELK, Grafana, New Relic, PagerDuty Async processing, caching, load testing, and SLA compliance 🎯 Domains I’ve Worked In ✔️ FinTech: Built backend APIs, fraud prevention, trading platforms in Python, FastAPI, Django, Celery, grafana, AWS. ✔️ EdTech: GPT integrations, adaptive learning tools using FastAPI, GPT API, Langchain, n8n ✔️ LegalTech: Scalable OCR + NLP processing using TensorFlow, Custom pipelines, Vector database storage ✔️ SaaS: Multi-tenant platforms, automation systems using React, Python, Next.js, Nest.js, AWS, FastAPI, Stripe, Oauth. 🎯What Sets Me Apart ✔️ Proven experience delivering complex platforms from scratch ✔️ 15M+ user databases, multi-cloud infrastructure, scalable patterns ✔️ Balanced blend of backend depth and frontend precision ✔️ End-to-end ownership: architecture, infra, dev, monitoring Let’s Build Something That Scales If you’re looking for a developer who can own the backend, integrate AI, and bring reliable systems to life, I’d love to collaborate. Send me an invite and let’s take your product to the next level

Expert web developer with more than a decade experience. Mainly focused on server side programming. High performance PHP & MySQL development. I am also good at html and javascript.