I am a back-end developer with experience in Java, JS, TS, COBOL, ABAP, and Go. I have been working full-time as a Go developer since 2022, focusing on building REST APIs and microservices. My workflow is powered by Docker, Kubernetes, and CI/CD tools like Jenkins and Gitlab CI, ensuring efficient development processes. I have experience with AWS and Cloud Foundry for deployment, while monitoring is accomplished through Prometheus, Grafana, and Datadog. I also have experience in using K6 for load testing and Litmus for Chaos Engineering. My experience extends to migrations, including successfully transitioning Java projects to Go. I've worked extensively with various databases, including MySQL, PostgreSQL, MongoDB, Redis, S3. Additionally, I've optimized system performance by migrating HTTP APIs to gRPC and have experience with diverse message brokers like RabbitMQ, Kafka, and SQS. I am excited to bring my technical background and problem-solving skills to contribute effectively to your project.

I have been in IT field for over 30 years now. I have also been developing over 25 years. I have worked with mainframes, mid size frames and servers of all sizes. I have programming language experiences in RPG, CL, Visual Basic, Visual RPG, Object Oriented programming. I have developed full ERP systems using Microsoft Access and Microsoft SQL database for backend. I have a complete understanding in accounting and finance. My strength is taken any process and making it more streamlined and efficient. I have help over thirty different manufacturers stream line their process of the production and shipping . I have worked in all areas of barcoding and scanning. I have worked and developed many EDI systems and worked with large customer and suppliers to connect them using EDI integration. I also Work a lot with QuickBooks, Sage 50, Southware ERP , Epicor, NetSuite, Odoo and multiples other ERP system. I was a IT directory of large corporations for over 15 years before starting my IT company. .

𝗦𝘁𝗼𝗽 𝘀𝗲𝘁𝘁𝗹𝗶𝗻𝗴 𝗳𝗼𝗿 "𝗱𝗲𝗺𝗼-𝗴𝗿𝗮𝗱𝗲" 𝘄𝗿𝗮𝗽𝗽𝗲𝗿𝘀. 𝗜 𝗮𝗺 𝗮 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗔𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝘀𝗰𝗮𝗹𝗮𝗯𝗹𝗲, 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻-𝗿𝗲𝗮𝗱𝘆 𝗚𝗲𝗻𝗲𝗿𝗮𝘁𝗶𝘃𝗲 𝗔𝗜 𝘀𝘆𝘀𝘁𝗲𝗺𝘀. 𝗠𝘆 𝗴𝗼𝗮𝗹 𝗶𝘀 𝘁𝗼 𝗰𝘂𝘁 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝘁𝗵𝗲 𝗔𝗜 𝗵𝘆𝗽𝗲 𝗮𝗻𝗱 𝗴𝗶𝘃𝗲 𝘆𝗼𝘂 𝗿𝗲𝗮𝗹 𝘁𝗮𝗹𝗸, 𝗿𝗲𝗴𝗮𝗿𝗱𝗹𝗲𝘀𝘀 𝗼𝗳 𝘄𝗵𝗲𝘁𝗵𝗲𝗿 𝘁𝗵𝗮𝘁 𝗹𝗲𝗮𝗱𝘀 𝘁𝗼 𝗮 𝗽𝗮𝗿𝘁𝗻𝗲𝗿𝘀𝗵𝗶𝗽 𝘄𝗶𝘁𝗵 𝗺𝗲. 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐀𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐆𝐞𝐧𝐞𝐫𝐚𝐭𝐢𝐯𝐞 𝐀𝐈 & 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭𝐬 | 𝐀𝐈 𝐂𝐡𝐚𝐭𝐛𝐨𝐭 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 I bridge the gap between complex models and user-friendly apps. As an expert AI Developer and AI Chatbot Developer, I recently architected AI Agents that reduced manual workflows by 70%. 🚀 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 ◇ 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭𝐬 & 𝐂𝐨𝐧𝐯𝐞𝐫𝐬𝐚𝐭𝐢𝐨𝐧𝐚𝐥 𝐀𝐈: I build autonomous AI Agents using LangGraph/Phidata and responsive AI Chatbot systems (LiveKit/VAPI). I am an AI Chatbot Developer focused on real-time logic and tool execution. ◇ 𝐆𝐞𝐧𝐞𝐫𝐚𝐭𝐢𝐯𝐞 𝐀𝐈 & 𝐋𝐋𝐌𝐬: Deep integration of Generative AI models (GPT-4o, Claude 3.5, DeepSeek, Llama 3) or opensource models from huggingface via vLLM and Ollama. ◇ 𝐑𝐀𝐆 & 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠: High-precision RAG pipelines using LlamaIndex/GraphRAG. As a Full Stack AI Developer, I deploy robust FastAPI/Django backends and React frontends. 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 ✔ Full Stack AI Developer for Custom SaaS ✔ AI Agent Development & Orchestration ✔ AI Chatbot & Conversational AI for Sales/Support ✔ Generative AI & RAG (Knowledgebase) Integration ✔ AI Chatbot Developer for Lead Gen & CRM Automation ✔ AI Developer for Workflow Automation (n8n/Zapier/Python) 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 ↦ Generative AI: LangChain, LlamaIndex, LangGraph, Lanfuse, RAG, Qwen3, Gemma3, Phi-4, Claude, Openai API, Openrouter, AWS Bedrock. ↦ Voice AI & Automation: Vapi, Twilio, Retell, Whisper, Deepgram, n8n, MCP. ↦ Backend and Frontend: Python, FastAPI, Next.js, SQLAlchemy, PyTorch, FAISS. ↦ Data & DBs: Supabase, Neon DB, PostgreSQL, Neo4j, Pinecone, FAISS, PySpark, Pandas. ↦ Inference: vLLM, Ollama, llama.cpp, Hugging Face, Quantization (4-bit/8-bit), CUDA. ↦ DevOps: Docker, Kubernetes, Git, CI/CD Pipelines, AWS. If this all sounds good to you, click the message button and let’s chat.

🟢 Available for new projects & consultations 📍 Located in Phoenix, Arizona (MST) — working with clients worldwide I’m a full stack developer and UI/UX designer with a decade of experience turning complex ideas into clean, scalable, conversion driven products. I blend engineering precision with design first thinking to build apps that feel great to use, look sharp on every screen, and perform reliably under real world pressure. I also integrate modern AI capabilities such as intelligent automation, custom chat assistants, and data driven user experiences to help teams launch smarter, faster, and more adaptive products. From custom dashboards to e-commerce builds, AI-powered automations, brand-new MVPs, and full redesigns, I handle the entire product lifecycle end-to-end. My approach is straightforward: understand the goal, design with intent, and engineer with future scale in mind. Core Expertise • Frontend/Backend: Next.js, JavaScript, Python, PHP ecosystems • Databases: NoSQL & RDBMS schema design, optimization, and integration • CMS/CRM: WordPress, NationBuilder, Wix • E-commerce: Shopify, BigCommerce, WooCommerce • Cloud: AWS, Azure, GCP • UI/UX: Figma & Adobe, brand-aligned, conversion-focused • AI Development: OpenAI / Anthropic API integrations, custom AI assistants, RAG systems, embeddings, vector databases, NLP pipelines, LangChain/LlamaIndex • AI Automation: AI-driven workflow automation, intelligent data extraction, AI-powered CRM & e-commerce automation • Automation: Custom scripting & AI integrations • Security: Best-practice implementation and hardening If you need a developer/designer hybrid who can elevate your product while keeping an eye on performance, brand, and measurable results, I’m your partner. Let’s build something that stands out and scales.

♛ Upwork Certified All-Star QA Freelancer Gold Club Member with "TOP RATED PLUS" Badge ♛ Worked with many Fortune 500 companies, including Gametime Inc., Halo Neuroscience, Stella & Dot, Sortly Inc., PJA Agency, Doxo Inc., etc... ♛ So far, I have delivered over $2,000,000 in savings to my clients through my exceptional quality of service. ♛ Key Achievements: 6x revenue growth, 30% increase in margin, 250% increase in monthly active users, 100% increase in paid/unpaid conversion to active users ♛ Listed among TOP 1% of Successful Upwork Freelancers with a perfect "100% Job Success." ★ Completed more than 120 Jobs with 39000 hours and a 5-star rating all together ★ Logged 40000+ valid defects overall ★ Result-oriented full-time freelancer & Certified Software Test Engineer ★ 15 years of extensive experience in software testing ★ Plenty of experience in Agile/Scrum/Kanban/Lean methodologies ★ 100% client satisfaction ratio with 90% of repeated clients ★ The apps I have tested are in All-Time Great/Award-winning categories like Gametime, Beachbody, Color Splash, Brainscape, Sortly Inventory, ScreenShopIt, Katya Workout, FitNation, Doxo, Timeline 3D etc. ★ Upwork Top 10% in : - Software Testing Test, SQL/MS SQL Server Test - US/UK English Basic Skills Test, English Spelling/Vocabulary Tests - WordPress Test, and many more... ★ Sound experience in the following Applications: Web, Desktop and Mobile applications. Business applications and services: B2B, B2C, C2C, SaaS. More skilled in CRM applications, e-commerce, medical software, real estate, legal and banking services, integration with social networks • Physical Devices available for Testing • iPhone 13 Pro Max (iOS 16) iPhone 11 Pro Max (iOS 15) iPhone 12 mini (iOS 17) iPhone X (iOS 14) iPhone XR (iO 14.6) iPhone 6s+ (iOS 12.1.4) iPhone 6 (iOS 12.1) iPhone 5 (iOS 10.3) iPhone SE (iOS 13) iPad Air 2 (IOS 11) iPad Pro 10.5 inch (iOS 13) Samsung Galaxy 21 Ultra (Android 12) One Plus Nord (Android 11) Samsung Galaxy S7 edge (Android 8.0) Motorola One Power (Android 10) Huawei Prime Y9 2019 (Android 9.1) Lenovo K8 Note (Android 7.1.1) LG Nexus 5 (Android 6.0) Windows XP/7/8/10 (All Browsers), Mac OS X (12.6 and 13) • I work uniquely: You don't have a clear requirement! No problem, I can still work without it. You are still preparing the specification! No problem, I don't wait for that. You have a budget constraint! No worries, I would fit into it. You don't have any test cases/test plans/documents in place! No problem, that's where I come into the picture. • Give me your application and I'll give you the defects in it • Let me go through your product, and I would provide how to proceed with the testing & how effectively your application can be tested. I will come up with the best test cases/comprehensive test plans, important use cases and most importantly unique and incredible application improving and business fetching suggestions. My job just doesn't end here. Once I verify the defects in all major browsers/OS, I log them in whatever format/tool you choose along with the screenshots & videos. I will be there to verify the resolved defects. So if you are looking for above skills and qualities then your search ends here! If you still have some doubts, please take a look at the feedbacks provided my valuable clients. I deliver what I promise, I do not promise which I can not deliver. Being a true professional, I dare to do whatever it takes to make my client's business successful with improved customer conversation. I am sure we can do some business. Cheers!

Key Responsibilities: Project Management: Assisted in planning, executing, and monitoring projects, ensuring milestones were met on time and within budget. Coordinated with team members to streamline workflows, manage deliverables, and maintain project documentation. Administrative Support: Managed executive calendars, scheduled meetings, and coordinated travel arrangements, ensuring efficient time management and prompt communication. Organized and maintained electronic files, prepared documents, and managed correspondence via email and other communication platforms. Customer Support: Provided first-line customer service support, answering inquiries, resolving issues, and escalating complex cases to appropriate departments. Monitored and responded to client emails and messages, ensuring a high level of satisfaction and timely resolution. Social Media Management: Managed social media accounts, scheduled posts, responded to comments and messages, and monitored engagement analytics. Developed content strategies and assisted in creating and curating content to enhance online presence. Data Entry & Management: Inputted and updated data in various databases and CRM systems with high accuracy. Compiled reports and analyzed data to provide insights and support decision-making. Financial Management: Handled invoicing, payment tracking, and expense reporting, ensuring accurate financial records. Assisted in budget planning and monitored expenditures to stay within allocated budgets. Research: Conducted online research for various tasks, including market research, competitor analysis, and sourcing vendors. Compiled findings into reports and presentations to support business strategies. Client Relations: Built and maintained positive relationships with clients by ensuring their needs were met with professionalism and efficiency. Scheduled and attended client meetings, taking detailed notes and following up on action items. Key Achievements: Streamlined scheduling processes, reducing appointment conflicts by 30%. Improved customer response times by 50%, leading to a 20% increase in client satisfaction ratings. Developed a content calendar that increased social media engagement by 40% over six months. Successfully managed multiple projects simultaneously, leading to the timely completion of all projects with a high level of client satisfaction.

Good day! I'm a java development expert with a strong experience at server side field. In recent years I have participated in many projects related to telecommunications and banking sector, advertising and data management. I try to use different software development approaches to keep balance between complicated technologies and reliability of software product. I am a well communicative, easy teachable and responsible person with analytical mind. My specialties: innovation software development, biometric security systems, cloud based payments, complex software design, distributed systems, server-side development.

I’m a veteran IT professional, most recently executing Wordpress website edits and maintaining event registrations on a CMS platform for a large, local, multi-campus church. Prior to this, I was involved in enhancing, maintaining, troubleshooting, and administrating Drupal & Wordpress websites for a volunteer organization, a startup company, and as a freelancer for clients. While seeking projects that involve building new websites or enhancing the functionality of existing websites using the Wordpress CMS platform, my career focus is still on programming in COBOL. Here’s just some of the positive feedback received for past projects: “This was our first time using Upwork and it was absolutely a great experience. We will certainly use Ronnie for future projects. This could not have gone better.”

Legacy System Modernization | Enterprise Integration | Digital Transformation With over a decade of hands-on experience in IBM i (AS400/iSeries) development, I specialize in building, modernizing, and integrating enterprise-grade applications across sectors such as finance, retail, manufacturing, and healthcare. I bring a rare blend of core IBM i expertise, modern web technologies, EDI integration skills and AI-assisted development, enabling seamless digital transformation while preserving business-critical operations. Core Competencies- IBM i Development: Expert in RPGLE (Free Format), SQLRPGLE, COBOL, CL, SYNON, ADELIA, and Visual LANSA Web Development: Skilled in PHP for building modern web interfaces and services that interact with IBM i systems Database : Deep knowledge of Db2 for i (DB2/400) and MS SQL, with specialization in query optimization and performance tuning System Modernization & Migration: Proven track record of modernizing legacy RPG/COBOL/Mainframe systems and migrating critical workloads to hybrid environments with minimal disruption EDI & Integration- Standards: ANSI X12, VDA, Positional Tools: IBM Sterling B2B Integrator, EDI Mapping, BPA Connectivity: AS2, FTP/SFTP | VANs: OpenText, Liaison, GHX, SPS, TrueCommerce Transactions: 850, 855, 856, 810, 820, 830, 834, 835, 837, 204, 210, 940, 945, 947, 844, 845 (and others) AI‑Augmented Development- Daily use of GitHub Copilot and Claude for RPG/PHP development, legacy code analysis, SQL optimization, documentation, test case generation, and modernization planning—driving faster delivery, cleaner code, and reduced risk with enterprise compliance. What I Bring to the Table- Strong grasp of IBM i architecture and how to securely integrate it with cloud, web, and third-party systems Ability to analyze, refactor, and modernize legacy codebases for long-term maintainability Experience delivering robust, scalable, and secure solutions for Fortune 500 enterprises Let’s Connect If you’re looking for an experienced professional who can modernize IBM i systems, streamline EDI operations, and accelerate delivery using AI‑assisted development, I’d be glad to discuss how I can support your next initiative. Keywords- #IBMi #AS400 #RPGLE #Synon #COBOL #DB2fori #LegacyModernization #DigitalTransformation #PHPWebIntegration #EDIMapping #EDIIntegration #SterlingIntegrator #VAN #AS2 #ERPIntegration #HybridArchitecture #MainframeMigration #EnterpriseIntegration #WebAndCloudBridge #EDITransactions #NetSuite #Prelude #P21 #WMS #TMS #SecureDataExchange #SQLRPGLE #CLProgramming #VisualLANSA #BusinessProcessAutomation #Fortune500 #iSeriesDeveloper #LegacyCodeRefactoring

Java developer with bootcamp hands-on experience with Java, Spring, SQL, and frontend development. Previous experience in development using COBOL programming, database management using SQL, and maintaining an existing system for a life and general insurance company. Ample exposure on collaborating with internal teams, clients, and end users to quickly and efficiently gather requirements and execute product acceptance testing.