Software should help your business grow not become the reason it slows down every time you need something new. Building software is only half the job. The other half is creating applications that are easy to maintain, easy to improve, and ready to scale as your business grows. That's the mindset I bring to every project. From MVPs to business-critical platforms, I've helped startups, agencies, and growing businesses build products that are meant to be used, maintained, and scaled not rebuilt. Whether you need a custom web application, a SaaS platform, an internal business system, or a modern website, I can take ownership from planning to deployment while keeping communication clear, development predictable, and quality uncompromised. Here's where I can help ✔ Custom Web Application Development ✔ SaaS Product Development ✔ React.js & Next.js Development ✔ Node.js & Express.js Backend Development ✔ MERN Stack Development ✔ REST API & Third-Party API Integrations ✔ Admin Dashboards & CRM Systems ✔ AI Integrations (OpenAI, Claude, Gemini) ✔ Authentication & User Management ✔ Payment Gateway Integration (Stripe, PayPal) ✔ MongoDB & PostgreSQL Database Design ✔ WordPress & WooCommerce Development ✔ Performance Optimization, Bug Fixes & Ongoing Maintenance Why clients choose to work with me: ✔ 7,200+ hours worked on Upwork ✔ 70+ successful projects delivered ✔ Long-term partnerships with startups, agencies, and growing businesses Technologies I Work With Frontend: React.js, Next.js, TypeScript, JavaScript, HTML5, CSS3, Tailwind CSS, Bootstrap Backend: Node.js, Express.js Database: MongoDB, PostgreSQL, MySQL Cloud & Tools: AWS, Docker, Git, Vercel CMS: WordPress, WooCommerce What it's like working with me I don't measure success by the number of features delivered. I measure it by whether your product is easier to grow six months from now than it is today. I ask questions, understand your business goals, and recommend solutions that save time, reduce future development costs, and improve the overall product. If there's a better approach than the original plan, I'll explain why before writing a single line of code. You'll always know where the project stands, what I'm working on, and what's coming next. No disappearing. No vague updates. Just honest communication, clean code, and consistent progress. My goal isn't to become another freelancer on your project. It's to become the developer you can rely on whenever your product needs to evolve. If you're looking for someone who combines technical expertise with a practical understanding of business goals, I'd love to hear about your project. Let's build something that's fast, scalable, and ready for whatever comes next.

⚡️𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 ⚡️𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 ⚡️𝐉𝐚𝐯𝐚 𝐄𝐱𝐩𝐞𝐫𝐭 ⚡️𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐄𝐱𝐩𝐞𝐫𝐭 Are you ready to dive into the world of 𝐫𝐨𝐛𝐮𝐬𝐭, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞, 𝐚𝐧𝐝 𝐮𝐬𝐞𝐫-𝐜𝐞𝐧𝐭𝐫𝐢𝐜 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬? Look no further! With over 15+ years of hands-on experience, I'm here to craft software that exceeds your expectations at every turn. 🔧 Technical Expertise: On the backend, I'm a maestro with Java EE/Spring Boot, building servers that are as sturdy as a fortress. Wrangling databases is my forte; SQL is my language, and MySQL, PostgreSQL, and Oracle are my playgrounds. Frontend? Piece of cake! I whip up sleek interfaces using HTML5, CSS3, and dance with JavaScript frameworks like Angular and React. 🏢 Industry Expertise: Finance, e-commerce, healthcare, telecommunications – you name it, I've been there! I know the ins and outs of various industries like the back of my hand. Need secure payment gateways, HIPAA-compliant apps, or turbocharged telecom systems? I've got you covered! 🌟 Why Me? I don't just meet expectations; I exceed them. My commitment to excellence knows no bounds. Collaboration is my middle name. I'm all about teamwork, communication, and getting things done. I live and breathe innovation. Staying ahead of the curve is my jam, ensuring your projects are always cutting-edge. 💼 Let's Collaborate: Ready to elevate your digital presence and drive business growth? Let's team up and make magic happen! Your vision, my expertise – together, we'll create something truly extraordinary. Let's make your next project a resounding success! 🎉 𝗕𝘂𝘇𝘇𝘄𝗼𝗿𝗱𝘀: Full-Stack Development | MERN Stack | MEAN Stack | React.js | Vue.js | Angular | Node.js | Express.js | Next.js | Nuxt.js | RESTful APIs | GraphQL | MongoDB | MySQL | PostgreSQL | Firebase | Docker | Kubernetes | AWS | Azure | GCP | CI/CD | Agile Methodologies | TDD | BDD | DevOps | Microservices | Responsive Design | UX/UI Design | Web Applications | Progressive Web Apps | Single Page Applications | Serverless Architecture | Cloud Computing | Version Control | Git | Frontend Development | Front-End Development | Front End Development | Backend Development | Back-End Development | Back End Development | API Integration | Security Best Practices | Performance Optimization | Scalability | Cross-Platform Development | Mobile App Development | HTML | CSS | JavaScript | TypeScript | SASS | LESS | Bootstrap | Tailwind CSS | Webpack | Babel | SEO Optimization | User Authentication | Authorization | WebSockets | Real-Time Applications | Test Automation | Unit Testing | Integration Testing | End-to-End Testing | Code Review | Continuous Integration | Continuous Deployment | Technical Documentation | Software Architecture | System Design | Project Management | Collaboration Tools | Jira | Trello | Asana | Slack | Python | Django | Flask | Ruby | Ruby on Rails | PHP | Laravel | Symfony | Java | Spring Boot | Kotlin | Swift | Objective-C | C# | .NET | ASP.NET | VB.NET | Go | Golang | Rust | Elixir | C++ | C | Scala | Perl | Haskell | R | MATLAB | Julia | TensorFlow | PyTorch | OpenCV | Xamarin | Ionic | Apache | Nginx | Redis | Elasticsearch | RabbitMQ | Kafka | Jenkins | CircleCI | Travis CI

I’m a Full Stack Developer with 10+ years of experience building scalable, high-quality, and user-friendly web applications. I specialize in both frontend and backend development, delivering reliable solutions from concept to deployment. 💻 Core Skills: Backend: PHP, Laravel, CodeIgniter, CakePHP, REST APIs, Node.Js Frontend: React, HTML5, CSS3, Bootstrap CMS/eCommerce: WordPress, OpenCart, mooSocial, SocialEngine 🤖 AI Integration & Automation: I have hands-on experience integrating OpenAI, Claude, xAI, Ollama, and Model Context Protocol (MCP) into real-world applications. I build AI-powered features like chatbots, AI agents, content generation tools, and smart automation workflows. 🔗 API & Payment Integrations: Experienced with REST APIs, PayPal, Stripe, Square, Pay.jp, JazzCash, PaymentWall, Facebook, and Twitter integrations. 🚀 What I Offer: Clean, maintainable, and well-documented code Smooth API and third-party integrations AI-powered solutions and automation Responsive and intuitive UI/UX Reliable communication and on-time delivery I focus on building efficient, scalable solutions that help businesses grow and stand out. Let’s connect and bring your ideas to life!

Helping companies build scalable Salesforce AI-powered solutions through architecture, custom development, integrations and automations. Hi, I'm Pavel — a Top Rated Plus Salesforce Architect and Developer with 16+ years of hands-on Salesforce experience and 200+ successfully delivered projects. I help startups, SMBs, and enterprise organizations turn Salesforce into a platform that supports real business operations — from CRM architecture and automation to complex integrations, customer portals, custom applications, and AI-powered solutions. 🔹 What I Do Best Salesforce Architecture & Consulting Scalable Salesforce architecture, data models, security, integration strategy, and technical design aligned with business requirements. Custom Salesforce Development Apex, LWC, Visualforce, Flows, asynchronous processing, custom applications, managed packages, and complex business logic. API & System Integrations REST/SOAP APIs, OAuth 2.0, webhooks, Platform Events, Bulk API, middleware, event-driven integrations, real-time and scheduled synchronization, retry mechanisms, and error handling. AI Solutions & Automation AI-powered Salesforce solutions using Agentforce, OpenAI, Claude, LLM APIs, Prompt Builder, and custom AI integrations. Experience Cloud & Custom Portals Customer, partner, employee, recruiting, education, and financial portals — both Salesforce Experience Cloud and fully custom API-based portals integrated with Salesforce. Field Service & Complex Automation Salesforce Field Service, scheduling, Dispatcher Console, custom scheduling logic, Flows, approvals, orchestrations, and operational automation. CPQ & Revenue Operations Complex quoting, pricing, approvals, product configuration, and sales process automation. Data Migration & CRM Transformation Large-scale migrations, data cleansing, deduplication, transformation, and modernization of existing Salesforce environments. 🔗 Integration Experience I have designed and implemented integrations between Salesforce and dozens of external systems, including: Marketing & CRM: HubSpot, Mailchimp, ActiveCampaign, GoHighLevel, Pardot / Account Engagement, Brevo Finance, Accounting & Payments: Stripe, QuickBooks, Xero, Plaid, MoneyThumb, ACHWorks, Actum Documents & E-Signature: DocuSign, PandaDoc, Formstack, JotForm, SharePoint, OneDrive, Box E-commerce: Shopify, Magento, WooCommerce Communication & Productivity: Twilio, Slack, Gmail, Google Workspace, Outlook, Microsoft 365 Recruiting & ATS: Indeed Partner API, Bullhorn, custom recruiting and ATS platforms Cloud, Middleware & Automation: AWS API Gateway, Zapier, custom REST APIs, webhooks, Node.js and Python middleware Other Platforms & Services: Google Calendar, Google Sheets, Looker Studio, Google PageSpeed Insights, Voiso CTI, Revenue Grid, Plauti and other specialized business platforms. For many projects, standard connectors are not enough. I design custom integration layers with authentication, field mapping, queues, asynchronous processing, monitoring, retries, idempotency, and error handling. 🤖 AI Solutions & Modern Development AI is now an important part of both the solutions I build and the way I deliver software. I have implemented AI-powered solutions for clients in recruiting, financial services, education, real estate, and marketing. These projects include AI-assisted data processing, document analysis, classification, summarization, intelligent workflows, CRM automation, and integration of Salesforce with external LLM APIs. My AI technology experience includes: Salesforce Agentforce | OpenAI API | Claude API | Prompt Builder | Data Cloud / AI grounding | Custom LLM integrations I also actively use modern AI-assisted engineering tools such as Claude and Cursor throughout development. They help accelerate architecture research, development, refactoring, testing, troubleshooting, documentation, and code review while keeping the final implementation under professional engineering control. This allows me and my team to deliver complex functionality significantly faster without sacrificing reliability or maintainability. ☁️ Salesforce Expertise Sales Cloud | Service Cloud | Experience Cloud | Field Service | CPQ | Revenue Operations | Marketing Cloud | Account Engagement (Pardot) | Health Cloud | Education Cloud | Nonprofit Cloud | Data Cloud | Agentforce 🏆 Certifications Salesforce Certified Application Architect Salesforce Platform Developer II Salesforce Platform Developer I Salesforce Administrator Salesforce Platform App Builder Integration Architecture Designer I don't see Salesforce as an isolated CRM. In most modern businesses, it is one part of a larger technology ecosystem. My job is to make Salesforce, external platforms, custom applications, data, and AI work together as one reliable system. If you need a Salesforce Architect or Developer who can handle both Salesforce itself and the complex integrations and AI solutions around it, I'd be happy to help!

Unavailable, busy working on the ongoing project, unable to take on new work, but open to discuss something. --- Only if you prefer quality and value proactivity. Willing to take long term projects (3+ months) at lower rate (although this may depend on the project). Looking for long-term part time job during the number of hours per week your business can afford (e.g. 10, 20 or 30 hours/week). Willing to solve urgent tasks submitted in Monday, Asana, Slack (or another PM software) parallelly working on continuous improvements (e.g. security or usability improvements) or new developments for your primary project during remaining number weekly allocated hours. ----------- I am your guarantee of 100%+ completed tasks. I’m expert in Web programming with 30+ years of experience. I always focused on implementing the best engineering practices to optimize and automate processes and increase efficiency. My goal as a programmer — to automate everything as much as possible, implementing intuitive and friendly interfaces and ways of communication between humans and machines. I believe that humans should do only creative work, the routine can be done by programs and robots. I strive to complete everything ever started, not dropping on half way. Autonomous and communicative, always very proactive. Skills: Web application development (both front and back-ends) and System application development for Windows, MacOS, Linux and mobile devices (iOS and Android). Secondary skills: I can do DevOps job, set up CI/CD workflows and automation scripts, create browser extensions, Telegram bots, have some design skills with Adobe Illustrator and AfterEffects. Programming Languages: JavaScript/TypeScript (React/Redux, Node.js+Express.js), GoLang, PHP, Perl. Native system app programming in Delphi and C++ Builder. Some experience with Java, C/C++, C#, Vue.js. And of course, HTML/XML, CSS (Sass, Scss, fav CSS framework is Bootstrap, fav components library is MUI). Databases: MySQL/MariaDB, PostgreSQL, MS SQL, SQLite, MongoDB, Interbase HTTP servers: Nginx, Apache, ISS. Cloud Platforms: AWS, GCP (certified in 2018), Azure, Digital Ocean. CMS, CRM, APIs and integrations: WordPress/WooCommerce, ShopSite, SnipCart, SimpleTix (tickets), GIS / mapping (MapBox, Leaflet.js, OpenLayers), marketing CRMs (HubSpot, Zoho, Klaviyo), Twilio, BigMailer, Meta/Facebook, Bing, full set of Google APIs (incl. Google Analytics), Mixpanel, DocuSign, UPS API, Stripe, PayFlow etc. Security: PCI DSS, HIPAA, GDPR compliance. Git & workflows: GitHub, GitLab, BitBucket, Beanstalk. I prefer working with Cloud services (the most experience with AWS and GCP, some with Azure). For CI/CD workflows I prefer Azure DevOps, although I also have experience with GitLab and GitHub+Netlify. Also, although I’m focusing on software development, I have good design skills, can create user interfaces from scratch and draw vector graphic in Adobe Illustrator, etc. And if you need an old school developer, I do low-level Windows/DOS programming in Assembly language too. And can support and update legacy web-applications written in Perl. I am the author of AppControls and DiskControls packs, 2 popular sets of the VCL components for Delphi and C++ Builder (google for AppControls). Significant periods in my career: 2019 — 2024: freelancer + support, maintenance & couching for past projects (after moving to the USA in 2019) 2007 — 2018: Full Stack Web Architect + Team Leader. Founder and CEO in a small B2B-opriented business operating at the intersection of IT and brand marketing. Public opinion research with gamification. 500+ clients including Microsoft, Samsung, Asus, Mazda, P&G, J&J, Amway, Bayer etc. 1999 — 2007: Windows and Web programmer (Delphi, C++ Builder + various SQL databases + some backend web development in Perl and PHP). Remote work on US companies TeknoSurf. Advertising.com (acquired by AOL) and others. 1995 — 1999: Windows programmer for INET LLC (Kyiv, Ukraine). Energy saving and energy metering systems, development of automated workstation for energy dispatcher. 1992 — 1995: DOS programmer (Turbo Pascal and Assembly language), student’s part-time job.

Full stack developer w/ 12 years experience and focusing on WordPress development and giving clients what they want. Task oriented. Clear communicator. Loves the work, takes ownership of every project. I make myself readily available to my clients 5 days a week and sometimes 6. 'Randall is an honest and available developer. Most developers do not make themselves available to discuss requirements with the client and with the team but randall goes above and beyond the expectation' - Jonathon Bridges 'We really enjoyed working with Randall to complete a rush project. He was easy to work with, in communication regularly and helped us get the job done right.' - Kat Bundy -WordPress -PHP -JavaScript -jQuery -CSS3 -WooCommerce -SASS -mySQL Beyond just tweaking themes, I can offer a high level of WordPress customization, including but not limited to: custom plugins, custom widgets, custom post types and just about any kind of custom functionality you need. If I am one thing it's flexible, client have different methods and needs, no 2 clients are exactly alike. Listening to clients and giving them what they want is what I do. Sometimes a client need an advisor as well as developer, in those situations, I'm adept at providing these kinds a clients a road map to success. 'This was my first experience with Upwork. I couldn't have picked a better partner to help me with my task.' - Joe Cotellese "Randall is super easy to work with, he anticipates issues and is very timely in bringing them up. His skill and cooperation are excellent and he is very accessible. He gets the work done quickly, follows direction and does a great job! He can also think for himself and isn't shy about researching issues. I will happily continue to use Randall for my WordPress development. - Merry Gray "Randall is nothing short of amazing! He is the best developer I've ever worked with. He really came through for us." - Don Slepien

I help eCommerce businesses launch, migrate, and automate their stores, on Magento / Hyva / Adobe Commerce, Shopify, and WooCommerce, having Adobe Certification and with 13+ years of hands-on delivery across FinTech, Fashion, Jewellery, and Healthcare. From a 300K-product Magento marketplace, Chatbots on WooCommerce, to AI voice agents on Shopify, I build systems that work, not just websites. Have a project in mind? Drop a message and let's map it out. - - - - - - - - - - - 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀 Magento, Shopify, WooCommerce, PrestaShop, BigCommerce 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 FinTech, Fashion, Jewellery, Healthcare 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 Stripe, PayPal, Klarna, Apple Pay, Google Pay, BNPL, Paylike, Moneris, SagePay, Humm, Tabby, SEPA, iDEAL, STC Pay, Tamara, Authorize.net 𝗦𝗵𝗶𝗽𝗺𝗲𝗻𝘁 & 𝗠𝗮𝗿𝗸𝗲𝘁𝗽𝗹𝗮𝗰𝗲 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 ShipStation, FedEx, UPS, USPS, DHL, SMSA, Aramex, DPD, Canada Post, Royal Mail 𝗢𝘁𝗵𝗲𝗿 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 & 𝗠𝗮𝗿𝗸𝗲𝘁𝗶𝗻𝗴 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 MS Dynamics 365, Oracle NetSuite, Odoo, HubSpot, Salsify, Klaviyo, Mailchimp, Google Analytics, Zoho 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 Backend: Node.js, Next.js, TypeScript, Laravel, PHP, CodeIgniter Frontend: React.js / React Native, Angular, JavaScript, HTML/CSS, Hyva, PWA Databases & Tools: MySQL, MongoDB, Firebase, REST APIs Design: Figma, Adobe XD Automation & AI: Retell.ai, N8N - - - - - - - - - - - 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 I partner with startups and scaling businesses to build eCommerce infrastructure and AI-powered automation that cuts operational costs and drives revenue. Whether you need a store built from scratch, a painful migration rescued, or your workflows automated with AI. I've done it, and I can do it for you. - - - - - - - - - - - 𝗛𝗲𝗿𝗲'𝘀 𝗵𝗼𝘄 𝗜'𝘃𝗲 𝗵𝗲𝗹𝗽𝗲𝗱 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝘀𝘂𝗰𝗰𝗲𝗲𝗱: 𝟭. MySpareParts - Startup Brought to Life Built from scratch on Magento, 300K+ SKU catalog live on day one, multi-vendor marketplace architecture, DHL shipping integrated end-to-end. 𝟮. AI-Based Pocket Coach WordPress platform with industry-specific AI chatbots powered by curated datasets, dynamic agents that adapt to each client's domain. 𝟯. Miraiclinical - Where eCommerce Meets AI Shopify store integrated with Retell AI, a voice agent handling order and product queries, plus a custom app delivering pre-shipment photos to customers automatically. Every project I take on gets my full attention, from the first scoping call to the final deployment. If you're looking for someone who can hit the ground running, communicate clearly, and deliver without hand-holding, LET'S TALK!.

Senior Full-Stack Developer • Performance Optimization Expert Java, Kotlin, JavaScript (frontend/backend), C++, Python, PHP, Perl SQL/NoSQL, Web/Desktop apps, Automation, Web Scraping I help companies make their software faster, lighter, and more efficient. 20+ years of hands-on experience in system performance tuning, profiling, solving bottlenecks, and refactoring legacy systems. If your application is slow, unstable, memory-hungry, or needs deep analysis — I can fix it. ⸻ 🧩 My Core Expertise • Performance optimization (Java/JVM, databases, backend services) • Query optimization, memory leak detection, code profiling • Refactoring legacy code, stabilizing old systems • Full-stack development (Java/Kotlin + JS, Python, PHP, Perl, C++) • Web automation & scraping • Systems analysis, debugging, complex issue resolution ⸻ 🚀 What I Deliver • Faster request processing • Reduced memory & CPU usage • Significantly improved database performance • Clean, maintainable, well-structured code ⸻ 🤝 Availability Open to long-term or part-time collaboration (30–40 h/week). Also interested in innovative startups: your idea — my implementation. ⸻ Let’s make your software fast, stable, and scalable!

- 🛠️ macOS/iOS Development: 10+ apps shipped using Swift/Swift UI/Objective-C - 🤖 VBA Automation: Delivered various macros/automation for clients. - 🚀 Full-Stack Capability: Type Script & Python (Flask/Django) & C++ backend integration Technical Arsenal: 🖥️ macOS/iOS Development - Swift/Swift UI: 10+ years, 10+ apps shipped - Objective-C: Legacy system migration expertise - Core Frameworks: AppKit, Core Data, Combine - macOS Code Signing and Notarization 🤖 Automation Engineering - VBA: 10+ years, enterprise-grade solutions - AppleScript: Seamless macOS integration - Python Automation: Selenium, Pandas integration ⚙️ Backend & Integration - Python: Flask/Django REST APIs - C++: High-performance computing modules - Cloud Integration: AWS S3, iCloud Sync My Commitment to Clients: I don't just write code - I deliver solutions that drive real business results. Whether it's automating tedious workflows or building mission-critical macOS/iOS applications. Let's build something extraordinary together.

I've been working with WordPress for over 10 years. No matter the theme, no matter the page builder, I can handle it. I also have great UI/UX skills to complement that. A lot of other freelancers are specialists that either know how to code or know design. I'm a rare blend of both. Here's what I can help with: - WordPress websites -- Working with any template or page builder you may be using -- ACF and custom post types -- Gutenberg blocks -- Email deliverability (make sure your website email doesn't go to SPAM) - New websites - Site redesign - Site migrations - Hosting, email and DNS setup - Google Analytics measurement and reporting - Logo design - Page template design - Landing pages I always act as a true partner and consultant, and not just an "order taker". This is a good thing! If you ask me to do something that doesn't make sense for your business, I will ask clarifying questions to discover what you truly *want* to accomplish and make recommendations that will make an impact. Finally, I have my Google Analytics individual qualification which means I can make sure you can accurately measure the performance of your site.