Leticia D.

$300K+ Earned on Upwork | AI, SaaS, LMS, Healthcare, Web & Mobile Development I help startups, businesses, and enterprises turn ideas into working software, launch MVPs faster, and improve existing applications without unnecessary complexity. My experience spans custom SaaS platforms, AI-powered applications, enterprise software, Moodle LMS, EHR and healthcare systems, eCommerce, and web and mobile development. Whether you need a new application, an experienced developer to take over an existing codebase, or a reliable development team for long-term work, I can help plan, develop, deploy, and maintain your solution. WHAT I BUILD • Custom SaaS and multi-tenant applications • AI-powered applications, AI agents, and automation • Moodle LMS, EdTech, and corporate training platforms • EHR, healthcare, and practice management systems • CRM, ERP, and enterprise applications • Web applications, dashboards, and client portals • iOS, Android, and cross-platform mobile applications • Marketplaces, membership, and subscription platforms • WordPress, WooCommerce, Shopify, and custom websites • REST APIs, third-party integrations, and business automation AI DEVELOPMENT & AUTOMATION OpenAI, GPT, Claude, DeepSeek, LangChain, LangGraph, RAG, AI agents, intelligent chatbots, vector databases, semantic search, document processing, and custom AI APIs. I work on AI applications that integrate with existing business systems, automate workflows, and improve operational efficiency. SAAS, CRM & ENTERPRISE DEVELOPMENT Multi-tenant SaaS, custom CRM, ERP integrations, subscription systems, role-based access, dashboards, billing, reporting, workflow automation, and API development. Our work includes SportsX, a multi-country management platform covering CRM, bookings, attendance, invoicing, and operational reporting. MOODLE, LMS & EDTECH Custom Moodle development, LearnDash, BuddyBoss, SCORM, H5P, interactive assessments, AI-powered learning, certificates, reporting, multi-tenant LMS, Zoom/BigBlueButton integrations, custom plugins, themes, migrations, and upgrades. Our EdTech experience includes Last Minute English, an AI-enabled learning platform combining exam preparation, automated assessment, and learner analytics. HEALTHCARE & EHR DEVELOPMENT Healthcare SaaS, EHR/EMR integrations, practice management, appointment scheduling, patient portals, clinical workflows, role-based permissions, and HIPAA-aware application architecture. MOBILE APPLICATION DEVELOPMENT Flutter, React Native, Swift, Objective-C, Java, Kotlin, push notifications, GPS, offline synchronization, payment integrations, and App Store/Google Play deployment. WORDPRESS, SHOPIFY & ECOMMERCE Custom WordPress themes and plugins, WooCommerce, Shopify Liquid, Elementor, Gutenberg, ACF, product migrations, payment gateways, supplier APIs, and fulfillment automation. For Cicio Performance, our development work included integrating 30,000+ products through a distributor API, automating inventory synchronization, order routing, fulfillment, and shipment tracking. CODEBASE TAKEOVERS & MODERNIZATION I also help businesses take over inherited codebases, fix production issues, implement new features, improve performance, modernize existing applications, and prepare products for launch without unnecessary rewrites. CORE TECHNOLOGIES Backend: .NET, ASP.NET Core, C#, C++, PHP, Laravel, Python, FastAPI, Node.js, Supabase Frontend: React, Next.js, Angular, TypeScript, JavaScript, MERN, MEAN, HTML, CSS Databases: PostgreSQL, SQL Server, MySQL, MongoDB, Redis Mobile: Flutter, React Native, Swift, Kotlin CMS & LMS: WordPress, WooCommerce, Shopify, Moodle, LearnDash, BuddyBoss Cloud & DevOps: AWS, Azure, Docker, EC2, S3, RDS, Lambda, CloudFront, Route 53, CI/CD APIs: REST, GraphQL, webhooks, Stripe, CRM/ERP integrations LONG-TERM SUPPORT & MAINTENANCE Alongside new development, I help clients maintain and scale existing platforms through debugging, performance optimization, application upgrades, cloud deployment, hosting migrations, security improvements, and ongoing technical support. CLIENT FEEDBACK "Great experience. Work was done brilliantly, and communication was superb. Highly recommended." "They went above and beyond expectations and delivered outstanding results." "Worked until the project was completed. A+ experience." LET'S DISCUSS YOUR PROJECT Whether you're developing an MVP, scaling a SaaS product, integrating AI, building a Moodle LMS, or improving an existing application, I'd be happy to understand your requirements and discuss the most practical approach.