Hire the Best eBay API Developers

AI tools are shipping more apps than ever. They are also shipping more bugs than ever. I fix them. I work with Claude Code and use advanced capabilities like MCP, Skills, and subagents to streamline complex workflows, automate repetitive engineering tasks, and significantly increase my development speed. I know these tools well. That is exactly why I can spot what goes wrong when they are used carelessly. I am a senior full-stack engineer with 7+ years of experience in PHP, Laravel, and VueJS. I specialize in jumping into existing codebases, finding what is broken, and fixing it properly. Not just patching symptoms. Finding root causes. Reading code I did not write is something I do fast. Whether it is a bug introduced by an AI assistant, a broken deployment, or a performance issue nobody can explain, I can diagnose it and resolve it. Here is what I work on: • Bugs and errors in PHP, Laravel, Livewire, and VueJS applications • Broken or unstable websites and web apps • Slow queries, poor database performance, and code bottlenecks • AI-generated or messy code that needs to be cleaned up and made maintainable • Server, deployment, and configuration issues on AWS My track record on Upwork: • Top Rated Plus (Top 3%) • 100% Job Success Score • AWS Certified Cloud Practitioner My Tech Stack: • Front-End: JavaScript, jQuery, VueJS, VueCli, VueX, Bootstrap, Tailwind, AlpineJS • Back-End: PHP, Laravel, Lumen, Livewire, Filament, TALL Stack, SQL, MongoDB • Third-Party Integration: PayPal, Stripe, Twilio, EasyPost, Walmart API, eBay API • Tools & Technologies: Web-Sockets, FFMPEG, MySQL, Git, n8n, OpenAI Agents SDK • Cloud Services: AWS (EC2, RDS, S3, SNS, SES, SQS, Load-Balancing) If your app is throwing errors, running slowly, or just behaving in ways it shouldn't, send me a message. Please tell me what is happening, and I will take a look.

Hi, I’m Nashit, a full-stack developer who builds custom automation systems for ecommerce sellers and agencies. I specialize in integrating Amazon, Walmart, eBay, and Shopify into powerful dashboards, scripts, workflows, and apps that save you hundreds of hours. If you sell on multiple channels and you’re tired of manual data entry, slow tools, or outdated software, I build fast, reliable, and scalable automations that simply work. ⭐ What I Build 🔹 Amazon SP-API + Ads API Solutions Orders, Listings, Feeds, Reports Ads (Sponsored Products / Brands) automation Custom dashboards (React/Node) MWS → SP-API migration Custom order data → engraving/production automation 🔹 Walmart API Integrations Item setup, inventory sync Order processing & fulfillment automation Performance metrics dashboards Price syncing 🔹 eBay API Integrations Listing creation/update Order sync → ERP/Production systems Inventory management Multi-account dashboards 🔹 Shopify App Development Custom private apps Order workflows Fulfillment connectors Bulk product automation Integration with Amazon/Walmart/eBay systems 🚀 What Clients Get ✔ One unified workflow for all marketplaces ✔ Real-time inventory sync ✔ Automated order routing ✔ Clean, modern dashboards ✔ Elimination of repetitive tasks ✔ Better decision-making with accurate data ✔ Huge time and cost savings 🧩 Tech Stack React, Node.js, Express, MongoDB, PostgreSQL, Next.js, Python, AWS, Webhooks, OAuth Systems 🌟 Why Work With Me ✔ 7+ years building production-ready ecommerce systems ✔ Worked with US/Canada multi-channel sellers & agencies ✔ Deep API experience across Amazon, Walmart, eBay, Shopify ✔ Strong communication & clear deliverables ✔ Clean code, documentation, and reliable ongoing support 📩 Let’s Build Something Message me your pain point or idea — I'll propose the best solution and get it implemented fast.

I help businesses automate repetitive work by building reliable scraping systems, data pipelines, and workflow automation tools. Over the last 15+ years, I’ve worked on projects involving large-scale web scraping, Excel/VBA automation, API integrations, eCommerce product pipelines, reporting systems, and structured data processing. Most of my recent work focuses on: • Web scraping and browser automation • Data extraction from marketplaces, directories, and dynamic websites • Backend automation workflows • Scheduled scraping pipelines • Data cleaning, normalization, and deduplication • Excel, Google Sheets, and database integrations I’ve worked on systems involving: • Ticketmaster inventory/event pipelines • WooCommerce vendor-feed automation • Marketplace monitoring and pricing workflows • Product catalog processing • Public-record and structured dataset extraction • Large CSV/database processing systems Tools I commonly work with: Python, Playwright, Selenium, Requests, BeautifulSoup, VBA, APIs, PostgreSQL, MySQL, SQL Server, Google Sheets, Excel automation. I focus on building automation systems that are stable, maintainable, and actually useful long-term — not just quick scripts that break after a few weeks. I’m comfortable working on: • One-time extraction projects • Ongoing scraping/monitoring systems • Data cleanup and processing workflows • Backend automation support • Long-term maintenance projects If you need reliable automation and clean structured data, I’d be happy to discuss your project.

I turn complex problems into products that make money. 15 years building SaaS and B2B. Preferred tech stack: * React * Next.js or tRPC * TailwindCSS * shadcn * Kysely (Drizzle, Prisma) * PostgreSQL (Supabase, Neon) * Python for heavy backend tasks / ML

🚀 Helping Amazon & Ecommerce Brands Scale Through Automation & System Design 🚀 I work with established Amazon sellers, DTC brands, and agencies who’ve outgrown manual processes, fragile spreadsheets, and disconnected tools. My role isn’t just to “integrate an API” — it’s to design reliable systems that reduce operating costs, eliminate data blind spots, and support scale without chaos. What I Do Amazon Systems & Automation Design and implement productiongrade solutions using Amazon SPAPI for orders, inventory, settlements, reimbursements, and financial reconciliation Migrate legacy MWS workflows to modern, scalable SPAPI architectures Handle throttling, retries, rate limits, and longrunning pipelines correctly Advertising & Growth Data Integrate Amazon Ads API and Marketing Stream Unify PPC, sales, and financial data into a single source of truth Enable ROIdriven decision making, not vanity dashboards Omnichannel & BackOffice Integration Connect Amazon with Shopify, WooCommerce, ERPs, accounting tools, and BI systems Replace manual exports and reconciliations with automated, auditable workflows Problems I Help You Solve Fragmented systems that don’t talk to each other High operating costs caused by manual processes Inconsistent or unreliable Amazon data “Black box” integrations no one fully understands Scaling pain once you pass 6–7 figures in revenue I design systems that keep working as volume, regions, and complexity increase. How I Work Architecture first — process clarity before code Profitfocused — every automation must justify itself Productionready — logging, monitoring, retries, and failure handling included Collaborative — clear communication with founders, ops teams, and devs As a PII approved Amazon developer, I operate with enterpriselevel security and compliance from day one. Technical Scope Backend: Python, PHP (Laravel), Java (Spring Boot), Node.js, C Data: MySQL, Postgres, DynamoDB, Redshift, MongoDB, Redis Infrastructure: AWS, Docker, CI/CD (GitHub Actions, Jenkins) Integrations: Amazon SPAPI & Ads, Shopify, WooCommerce, Walmart, eBay, QuickBooks Tools are interchangeable — correct architecture is not. Client Feedback “Leo balances deep Amazon SPAPI expertise with real business understanding. Communication was clear, delivery was solid, and the system held up even as scope grew.” “Leopoldo provided expert guidance on SPAPI, answered complex questions clearly, and helped us move forward with confidence. Fivestar experience. ⏳ If You’re Scaling and Need Systems That Won’t Break — Let’s Talk ⏳ Whether you need a full architecture, a migration, or a second opinion, I can help you move forward with clarity and confidence.

With over 14 years of experience, I specialize in transforming complex business requirements into scalable web applications that drive real revenue growth. My expertise spans full stack development, AI integration, and payment solutions, ensuring that every project I undertake is both innovative and robust. Core Expertise & Skills Backend Development 1. PHP: Developing robust applications since 2007 2. Laravel: Building enterprise-grade applications since 2012 3. Livewire: Real-time interfaces for modern web apps 5. API Development: RESTful services handling millions of requests 6. Database Design: MySQL optimization for high-traffic systems AI & Code Auditing 1. AI-driven code verification for enhanced accuracy 2. Comprehensive code reviews to ensure quality and security 3. Migrating legacy systems to AI-driven platforms for modern business needs Payment Solutions 1. Stripe / Stripe Connect: Certified expert with 50+ marketplace integrations since 2014 2. Payment Orchestration: Designing and implementing complex payment systems 3. E-commerce: Complete online store development and optimization Frontend & UI/UX 1. WordPress: Crafting dynamic websites since 2010 2. Modern CSS: Tailwind CSS, Bootstrap responsive design 3. Figma: Mastery in creating intuitive UI/UX designs 4. JavaScript: Dynamic interfaces and real-time functionality 6. Performance: Sub-3-second load times on complex applications MCP Experience 1. Figma, WordPress, Laravel: Mastery in creating and managing complex projects Additional Technologies 1. React.js, Python, Vue.js: Proficient in understanding and coding with AI assistance Data Analysis & Visualization 1. Analytical insights for data-driven decision making 3. Creating visualizations to simplify complex data sets Enterprise Integration 1. CRM Systems: Zoho CRM, custom business workflows 2. Marketing Automation: Email sequences, customer lifecycle management 3. Third-party APIs: Google services, social authentication, AI chatbots Cloud & DevOps 1. AWS & Digital Ocean: Scalable infrastructure deployment 2. Laravel Forge: Automated deployment and server management 3. Git/GitHub: Version control and collaborative development Professional Experience 1. Built 100+ web applications across various industries 3. Specialized in SaaS platforms and e-commerce solutions 4. Led development teams and mentored junior developers 4. Consulted for Fortune 500 companies and funded startups Key Achievements 1. Generated $50M+ in client revenue through platforms I've built 2. Maintained 99.99% uptime across all production applications 3. Improved client conversion rates by 30-50% consistently 4. Recognized by Stripe as integration methodology contributor 5. My Development Approach I focus on building solutions that scale with your business growth. Every project includes: 1. Future-proof architecture designed for expansion 2. Security best practices with PCI compliance when needed 3. Performance optimization for exceptional user experience 4. Comprehensive documentation for long-term maintainability Ideal Project Types 1. SaaS application development and migration 2. E-commerce platforms with complex requirements 3. Payment system integration and optimization 4. Custom web applications for growing businesses 5. API development and third-party integrations I work best with ambitious businesses ready to invest in quality solutions that drive measurable results. Ready to discuss your project? Let's build something exceptional together.