Hire the Best XML Developers
in the United States
Plymouth, Massachusetts
As a freelance developer, I am a specialist in Microsoft Office applications with over 25 years of experience including macro coding with VBA (Visual Basic for Applications). I am also skilled in database design and development with Microsoft Access or SQL Server, and I have very recent experience with Google sheets data management and scripting with Apps Script. Working independently or with your team, I can help you with tasks such as Access database design and development or maintenance, Microsoft Office and Google scripting and automation, creating or modifying spreadsheets with formulas and formatting, and Microsoft Word document organization, formatting and scripting. I can perform conversions such as PDF to Excel with Python and web scraping using Python and libraries such as Beautiful Soup. I am a skilled technical writer and will fully document the work I do, including user instructions, when required. My project portfolio below includes three Access database projects, a Google Sheets project with scripting, two projects with automation for both Excel and Word, two additional Excel and another Word automation project, an Excel design project, an XML conversion project, and a web scraping project. My extensive IT experience includes .NET software development for Windows servers and desktops and SQL databases. In my most recent full time position, I designed and developed an application using OCR to locate key information such as party names on printed real estate and other legal documents handled by city and county clerks. Now in use by many customers, the application facilitates automatic verification of the names submitted electronically with the documents or keyed by a data entry person. The development language was C# and the database is SQL Server running as a service under Windows. The code reads XML output from an OCR process and uses extensive regular expression coding to locate information and format it for database storage. A project in my portfolio below includes automation with Excel of the regression testing for this application. I have developed WPF/XAML desktop applications with C# and with WinForms using C# and VB. I also have developed web applications using JavaScript, AJAX, HTML and CSS with backend database access to SQL server coded using C#. I developed one application with React, a copy of the popular Wordle game, using an external API. Throughout my career I have leaned and applied skills such as software architecture, object oriented design and development, database design, technical writing, and problem solving. If you hire me for your project, I promise that I will always pay close attention to the details and accuracy to make sure that the result meets your requirements. Before starting a project, I will listen or read carefully to make sure I understand those requirements, and my written and spoken communication with you will be in clear and precise English. My hourly rate quoted in this profile is negotiable. If my skills are a match for your needs please send me an invitation and I will respond right away.
- XML
- Scripts & Utilities
- Microsoft Access
- Microsoft Access Programming
- Microsoft Excel
- Microsoft Word
- Visual Basic for Applications
- Database Development
- Python
- Technical Documentation
- Object-Oriented Design
- C#
- Desktop Application
- Microsoft Azure SQL Database
- Google Apps Script
- Google APIs
East Islip, New York
I’m a senior software developer with 12+ years of experience building complete solutions. My work focuses on real-world integrations, automating business workflows, and connecting systems that normally don’t communicate. API Integration & Automation I’ve built end-to-end integrations for platforms such as: • Authorize.Net – ACH/credit card workflows, recurring billing, subscription engines, customer profiles • Shopify – GraphQL Admin API integrations, product and inventory sync, fulfillment workflows, reusable integration modules • Twilio – SMS automation, 10DLC compliance, sender profiles, message scheduling • DocuSign – embedded signing, routing workflows, signature tracking • Acumatica – inventory, orders, reporting, custom endpoints Most of my work centers around solving operational challenges: automating payments, syncing inventory, processing orders, handling messaging flows, and building dashboards or reporting tools that companies rely on day-to-day. Backend Development (.NET, Python, Azure) I design and build scalable backend systems including: • ASP.NET Core Web APIs • Python services and automation scripts • Azure Functions (scheduled tasks, event-driven workflows) • Cosmos DB and SQL-based architectures • Secure credential storage (Azure Key Vault) • OAuth2, token refresh processes, micro-service communication These backends typically support ecommerce integrations, billing systems, data pipelines, or custom business workflows. Swift iOS Development I develop native iOS applications in Swift and SwiftUI, focusing on clean UI, strong API communication, and secure data handling. Projects include medical record apps, document scanning workflows, and client-facing booking or scheduling apps. FileMaker Development (10+ Years) I have extensive experience building and improving FileMaker systems, including: • Custom API modules (Shopify, Authorize.Net, Twilio, Google, Microsoft, etc.) • Complex multi-step workflows and automation • Dashboards and reporting systems • Web viewer integrations with JavaScript • Modernizing legacy FileMaker solutions for performance and maintainability Background & Approach My military background built my discipline, attention to detail, and reliability. I take ownership of projects, communicate clearly, and design systems that are stable, maintainable, and practical for real business use. My approach is simple: deliver solutions that work in the real world, improve operations, and scale as the business grows.
- SQL Programming
- Disaster Recovery Plan
- Python
- Claris FileMaker
- Microsoft Windows PowerShell
- API Development
- API Integration
- JSON API
- Twilio
- DocuSign
- Authorize.Net
- ASP.NET
- JavaScript
- iOS Development
- Mobile App
Porter, Texas
I'm a detail-oriented full-stack developer with hands-on experience in Python, Django, Flask, HTML, CSS, and JavaScript—and I also specialize in multilingual desktop publishing (DTP), especially using Adobe InDesign for translated content. I’ve worked with global organizations and translation teams to accurately input translations into InDesign layouts, ensuring proper formatting, alignment, and design consistency across multiple languages including Arabic, Spanish, French, Hebrew, and MANY more. Whether you're a translator, nonprofit, or business needing localization support or web development, I bring problem-solving skills, reliability, and a sharp eye for quality to every task. Skills & Strengths: - Full-stack web development (Python, Django, HTML, CSS, JS) - Multilingual DTP in Adobe InDesign (translation typesetting & layout) - Cross-language formatting (LTR & RTL support, character encoding, font handling) - Strong work ethic and attention to detail - Able to manage multiple projects calmly and effectively - Fast problem solver, highly adaptable Projects & Accomplishments: - Built and deployed a custom stock trading application in Python - Created and manage 404 Studio, a small digital agency offering web and design services - Successfully laid out translated reports and brochures in InDesign for international nonprofit publications - Management experience in customer service and project with a focus on task delegation and reliability
- Linux
- CSS
- PHP
- Python
- SQL
- C++
- JavaScript
- HTML
Seattle, Washington
I can solve any custom API integration issue that other developers have given up on - from phone door openers to Swiss and American banks, from 1974's nacha technologies to artificial intelligence, crypto and blockchain. I have 22+ years of overall 🌐 Web Development experience, including 18+ years with ⚙️ Custom PHP, 16+ years with 📝 WordPress and 🛠️ API Integration, and 12+ years with 🛍️ eCommerce, along with other related technologies and programming languages. Located in Washington State, I have no problem working 30-40+ hours during American time. I am self-controlled, self-organized, flexible and learnable, I can adapt to whatever your project requires. ================================ 🛠️ API INTEGRATION I offer custom API integration for a wide range of services using the most common REST, SOAP and GraphQL protocols. There is a strong focus on authentication, error handling and personal data security. I have extensive experience working with 1,200,000+ records at a time with regular automatic updates down to the minute. 🛠️ API integration development 🛠️ Data transformation and processing 🛠️ Analytics, reporting and visualization 🛠️ Custom API/feeds development Some API integrations I have experience with: Ahrefs API, Amazon API Gateway, Amazon AWS API, Amazon Lambda API, Amazon PA API, Amazon S3 API, Bank Of America API, Barcode Lookup API, BigCommerce API, BlueBanc API, Brevo API, Bright Data API, ChatGPT API, Cloudflare API, CoinBase API, Detroit Trading API, Dukascopy API, Dynadot API, eBay Product API, Envato API, Ethereum API, Etherscan API, First Data API, Fiserv API, GoDaddy API, Google Places API, HubSpot API, Jobber API, Lead Byte API, Lead Galore API, Lead Horizon API, Lead Prosper API, Leads Hook API, MaxMind API, Meta Marketing API, Modern Dropship API, NameSilo API, NowPayments API, OpenAI API, PayPal API, Plaid API, Polygon API, Polygon Scan API, Quin Stage API, Quin Street API, Relograde API, RiskPay API, Round Sky API, Samsara API, Seamless Chex API, SendGrid API, Shopify API, Slack API, Square API, Stripe API, Supabase API, Tatum API, Thumbtack API, Trulia API, Twilio API, VideoHive API, WhatsApp Cloud API, WooCommerce API, WordPress API, Zillow API, etc... ================================ 🧠 DATA PROCESSING I offer ETL (Extract, Transform, Load) data processing services that include cleaning, transforming, and analyzing data to extract valuable insights. This can involve working with external APIs, large datasets, cloud or database storage. I have extensive experience with tools like PHP, databases and cloud services for efficient processing. 🧠 Data cleaning and transformation 🧠 Real-time data analysis and reporting 🧠 Data files creating and processing 🧠 Artificial intelligence enhancing ================================ ⚙️ MICROSERVICES I offer development of microservices for external project management or communication between different projects. This includes receiving data via API, converting it to the required format, storing it in a database or sending it via API to another service. I have experience working with Amazon, Google, Meta as well as smaller private services. ⚙️ Inbound and outbound API integration ⚙️ Converting one type of API to another type ⚙️ Splitting large queries into multiple queries ⚙️ Automatic processing of requests on schedule ================================ 🛍️ ECOMMERCE I offer product import/export and inventory management for eCommerce stores. This includes working with popular WordPress, Shopify, WooCommerce and BigCommerce as well as external marketplaces such as Amazon, eBay, Google Shopping, etc. I have extensive experience working with 100,000+ inventory processing and synchronization. 🛍️ Inventory management solutions 🛍️ Sales and performance analytics 🛍️ Fraud detection and prevention 🛍️ Marketplaces synchronization ================================ One last thing... there's a reason I have a 100% success score on Upwork. That's because I get it right the first time, or I will work for free until you're happy. Thank you for taking the time to review my profile. Looking forward to connecting with you!
- Custom PHP
- API Integration
- API Development
- REST API
- JSON API
- SOAP API
- GraphQL
- ETL
- Data Cleaning
- Data Processing
- WordPress
- Shopify
- WooCommerce
- BigCommerce
- Inventory Management
Birdsboro, Pennsylvania
Greetings! My name is Gary, and I am an expert software engineer and API integration specialist with over 7 years of experience building, optimizing, and maintaining advanced, scalable platforms. As a Top Rated Plus freelancer here on Upwork, you can rest assured that your project will be done correctly the first time around, with no corners cut. I develop only the best quality sites, plugins, and themes with code that is clean, efficient, and easy to maintain. I'll get straight to the point – primarily, my skillset includes: • Custom Software Development (Rust, Go, C++, PHP, and more) • Principal-Level Leadership/Guidance for Engineering Teams • Fully Custom WP Plugin and Theme Development (PHP, JS/TypeScript, HTML/CSS) • Shopify Plus Development (Custom Themes, Apps, and Extensions) • API Integration • Theme Installation and Setup • Plugin Installation and Setup • Single Sign-On (SSO) Implementation • Infrastructure, CI/CD, & DevOps (AWS, Cloudflare) • Microservices I have extensive experience and knowledge with Rust, C++, Liquid, PHP, JS/TypeScript, and of course, HTML and CSS. I'm very comfortable working with traditional SQL and NoSQL databases of all sizes to ensure secure and scalable performance. Don't hesitate to reach out if you're looking to kickstart or discuss an interesting project. I'm open to both direct contribution and consulting projects, as time allows. Thank you for your time!
- Scala
- API Integration
- JavaScript
- PHP
- HTML
- MySQL
- WordPress
- CSS
- RESTful API
- API
- React Native
- Graphic Design
- Plugin Development
- Theme Development
- Swift
Chula Vista, California
I am a Front End and Back End Developer. I enjoy taking complex problems and turning them into simple and beautiful code. I love structure and logic. I have been coding around 10 years now and I never stop learning – I love it. I want to share my knowledge with other upcoming or current developers. I am a current developer at Suner and Garcia a Digital Advertising Agency based in San Diego, CA. Where I spend constant hours making the internet a better place. Abraham Garcia Suner and Garcia
- jQuery
- CodeIgniter
- MySQL
- Laravel
- CSS
- HTML5
- JavaScript
- PHP
- PSD to HTML
- Apache Cordova
- CMS Development
- QuickBooks Online API
- Website Migration
- MySQL Programming
- Shopify
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