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Top Rated Plus freelancer with 17+ years of experience building backend systems, APIs, and internal tools for startups and enterprises worldwide. I specialize in PHP/Symfony backend development, third-party API integrations, and no-code/low-code platforms — plus growing expertise integrating OpenAI and chatbot technology into client workflows. Core expertise: -- Backend & APIs: PHP, Symfony, CodeIgniter, REST API design & documentation (Swagger) -- No-Code/Low-Code: Bubble(Certified), Retool, Xano, Airtable (Certified) -- Databases: MySQL, PostgreSQL, Firebase, Parse, Supabase -- Integrations: Twilio, Salesforce, Xero, OpenAI API, payment gateways, Google Dialogflow Directory Platforms: Brilliant Directories, eDirectory Recent impact: -- Built and maintain a large-scale classified platform — backend, data-scraping APIs, and --performance optimization -- Delivered backend systems for a cleaning-services platform processing billions of records across web, iOS, and Android -- Integrated OpenAI into a Bubble application for automated evaluation and structured feedback generation -- Built a Dialogflow-based chatbot for a food delivery platform -- Completed multiple Retool internal tool projects integrating APIs and databases to streamline client workflows Whether you need a robust backend, a fast no-code MVP, a legacy system modernized, or AI capabilities integrated into your existing product, I deliver reliable, production-ready work — fast. Let's talk about your project.

Most AI support chatbots deflect tickets. I build the ones that resolve them. I spent three years as Engineering Lead on Upwork's own support platform — Zendesk, Help Center, and the AI support chatbot behind it. WHAT THAT WORK PRODUCED - Cut Zendesk API usage 60% by redesigning the Upwork ↔ Zendesk integration - Lifted chatbot self-service resolution 58% by wiring the bot into Upwork's GraphQL layer and Zendesk Guide — Zendesk featured the work in their own customer marketing - Built a three-way messaging model for dispute cases, so freelancer, client, and agent shared one thread instead of three (also Zendesk-featured) - Raised CS agent productivity 60% with an internal Zendesk app - Ran chatbot platform work end to end — Ada (2017–2021), Forethought (2021–2024) Engineering since 2012. 100% Job Success on Upwork. WHAT I BUILD - Zendesk implementation, migration, and cleanup of instances that grew messy - AI chatbots that resolve — RAG over your real knowledge base, connected to your real customer data, with clean handoff to agents - Zendesk ↔ product integrations: REST, GraphQL, webhooks, custom apps - Help Center / Guide theme development and information architecture - Agent-productivity apps, triggers, macros, workflow automation - LLM infrastructure: RAG pipelines, MCP servers, n8n agent workflows, evaluation and observability RECENT BUILDS - Zendesk Skills — an expert knowledge pack that gives AI coding agents real Zendesk theme-development competence - Finch — a RAG support chatbot that answers from your knowledge base, opens a Zendesk ticket when it can't, and hands off to a live agent (in development) STACK JavaScript/TypeScript, Node, React, Next.js, Python, PHP/Laravel · OpenAI, Claude, Gemini, Ollama, LiteLLM, Langfuse, MCP · PostgreSQL, Supabase + pgvector, MySQL, MongoDB · Docker, Terraform, AWS, GCP HOW I WORK I find the root cause before I write code. If your chatbot plateaued or your API bill climbed, there's a reason sitting in the architecture, and patching the symptom just moves the problem somewhere else. I'll tell you what's actually wrong — including when the answer is smaller than the project you came in asking for. Send me the messy version of the problem. I'd rather see the real thing than a tidy spec.

I specialize in building and integrating flight booking and travel technology platforms, with hands-on experience working with real-world supplier APIs and production booking workflows. My core stack is Rust (Axum) for backend development, Next.js for frontend applications, and PostgreSQL for data persistence, with Redis and cloud infrastructure where high-performance caching and scalable deployment are required. A key area of my experience is multi-supplier flight API integration. I have worked on normalizing different supplier response structures into a unified canonical model, allowing the frontend and business logic to operate independently of individual supplier formats. What I can help you with Flight Search API Integration Fare Repricing / Revalidation Flight Booking & PNR Workflows Ticketing API Integration Multi-Supplier API Aggregation Canonical Response Architecture B2B / B2C Travel Platforms Fare, Tax & Markup Engines Booking Lifecycle & Status Management Wallet, Hold, Capture & Transaction Workflows API Caching & Performance Optimization Existing Flight API Debugging & Integration Fixes Technology Backend: Rust, Axum, REST APIs Frontend: Next.js, TypeScript Database: PostgreSQL Caching: Redis Architecture: Multi-Supplier Integration, Canonical Data Models, Booking Workflows I understand that integrating a flight API is not simply about sending HTTP requests. Real booking systems must safely handle changing fares, supplier-specific schemas, booking timeouts, duplicate requests, inconsistent supplier states, payment and wallet operations, and recovery when the supplier response is uncertain. If you are building an OTA, B2B travel portal, flight booking engine, or multi-supplier travel platform, I can help with both the implementation and the underlying system architecture.

React Native and Next.js Product Architect building cross-platform mobile apps, web SaaS platforms, Python AI backends, and full-stack cloud systems (Node.js, Supabase, Firebase, AWS). I take total technical accountability to eliminate operational friction for founders. Most tech products don't fail because the idea was bad. They fail because of operational friction. A frontend freelancer ignores backend security. A mobile developer points fingers at the API. An AI developer builds a fragile script that breaks under real traffic. You end up managing a fragmented team, burning venture capital, and missing your launch window. I eliminate that entire problem. As your single-point technical authority, I bridge the gap between UI/UX design, cloud databases, mobile apps, and custom APIs—building your platform under one unified, scalable codebase. HOW WE WIN TOGETHER (THE PLAN) - Zero-Friction Cross-Platform Architecture I build iOS and Android apps using React Native and Expo while developing web SaaS dashboards in Next.js and React. Sharing state and business logic across web and mobile cuts build times by 40% without compromising native performance. - Production-Grade AI (Not Toy Wrappers) I design context-aware AI Agent Development workflows and secure Retrieval Augmented Generation (RAG) systems. Pairing Python and FastAPI with the OpenAI API, I connect LLMs directly to your private company data using enterprise security patterns. - Hybrid Backend & Database Engineering Whether leveraging rapid BaaS tools like Supabase and Firebase for immediate MVP speed, or engineering custom Node.js microservices and high-concurrency PostgreSQL hosted on Amazon Web Services (AWS), I build backends designed for scale, offline caching, and real-time syncing. - Codebase Rescue & Refactoring If previous developers left spaghetti code, fragile APIs, or unscalable database schemas, I take over. I audit your system, patch security risks, refactor the architecture, and push your release across the finish line. EXACT TECH STACK & CORE CAPABILITIES - Mobile App Development: React Native, Expo, iOS Development, Android App Development, Offline Caching - Web SaaS & Dashboards: Next.js, React, Web Application, TypeScript, SaaS Development - AI & Machine Learning: AI Agent Development, Retrieval Augmented Generation (RAG), OpenAI API, Python, FastAPI - Backend & Cloud Infrastructure: Node.js, Supabase, Firebase, PostgreSQL, Amazon Web Services (AWS), Software Architecture, API Integration If you are putting capital, revenue, or your market reputation on the line, don't leave your product to fragmented freelancers. Click "Invite to Job" or send a message—let's review your build and map out your launch.

Hi, Ready to join full time or open to offers, Please Offer me!! Eagerly looking for an offer to get started... Senior Nodejs/nestjs/React/Vue/angular/graphql/react-native/aws/webrtc developer available for fulltime/part-time/contract/project. I call myself as full-stack web engineer, having B.Sc Engineering Degree in Computer Science and Engineering, have been working on web-based technologies for about 7+ years. Have worked on varieties of projects. Looking for Full-time Position. The main thing is, I am a good learner/very honest person/very much motivated and I have enthusiasm and want to learn technologies and gather experience by joining to a global team and dedicate myself. University Courses C, C++, Java, PHP, Machine language, Visual prolog etc Artificial intelligence, Data structure, Database architecture, Compiler Design, Neural network Mysql database, Oracle, PL/SQL Software Engineering, Software management, Software Architecture, Academic projects, Thesis Participating couple of programming contests(including ACM ICPC) and got good results.(1st place amongst classmates) Built varieties of web apps using php and using node.js socket.io webrtc nosql based db. Reliability, hard work, good communication, good work ensured here. I am looking for part time job as a Node.js/javascript app developer. I have expertise in peer to peer communication i.e WEBRTC... Currently Looking for a Part Time/ long term work relationship. Thanks Regards Mustak Full stack web engineer

Senior Laravel Developer with 8+ years building high-performance APIs, scalable web apps, and leading full-stack teams for startups and global companies. Hi, I’m Md Rasel Ahmed — a results-driven Senior Back-End Developer with over 8 years of experience building robust, scalable Laravel applications, architecting secure APIs, leading development teams, and managing projects from concept to deployment. I bring both technical depth and business understanding to deliver solutions that solve real problems — fast, clean, and production-ready. ✅ Core Skills & Strengths 🔹 Laravel & API Engineering • Advanced Laravel application architecture • RESTful APIs for SaaS, mobile apps, CRMs • Complex backend logic, modular systems, microservices • Authentication: JWT, Passport, OAuth, RBAC • Vue.js or Inertia.js integration with Laravel 🔹 DevOps & Infrastructure • Deployment on AWS, DigitalOcean, Linode, and custom VPS • Jenkins-based CI/CD pipelines • Server setup: NGINX, Apache, Supervisor, Cron jobs • SSL with Let’s Encrypt, performance optimization, load balancing 🔹 Frontend Collaboration • Responsive UI from Figma to HTML/CSS • Tailwind CSS, Blade templates, Vue.js • SEO-ready and mobile-friendly interfaces 💡 Complex Problem Solver • Multi-tenant SaaS systems • Realtime APIs & websocket support • Payment integrations (Stripe, PayPal, etc.) • 3rd-party API integrations (Twilio, SendGrid, etc.) • Data migration & large-scale optimization 👨‍💼 Leadership & Management Experience • Led remote and cross-functional development teams • Acted as Team Lead, Project Manager, and Product Manager • Experienced in Agile/Scrum, sprint planning, and roadmap delivery • Successfully delivered complex projects for multinational clients across the UK, USA, Japan, UAE, Australia, Canada, and other countries in Europe and Asia. 🏢 Industry Domains Healthcare | FinTech | E-commerce | ERP | CRM | Logistics | Booking Platforms | Education | Social Platforms 🎁 Client Benefits • FREE 2 Months Support After Project Completion • FREE Bug Fixing & Warranty Period • Clear Documentation & Long-Term Maintenance Option • 100% On-Time Delivery & Open Communication 🛠 Tools & Tech Stack Languages & Frameworks: • PHP (Laravel, Symfony, Yii2), Node.js, Python (Django – intermediate) • JavaScript, Vue.js, React (basic) DevOps & Infra: • Jenkins, GitHub Actions, Docker (basic), AWS, DigitalOcean • NGINX, Apache, Supervisor, Cron, SSL Databases: • MySQL, PostgreSQL, MongoDB, MariaDB, MS SQL Other Tools: • Figma, Postman, Bitbucket, Jira, Trello, Slack, ClickUp 🔍 Keywords Laravel Expert, PHP Backend Developer, API Integration, DevOps AWS, DigitalOcean VPS, CI/CD Jenkins, SaaS Architecture, Team Leader, Project Manager, Product Manager, Figma to UI, Tailwind CSS, Vue.js, Full Stack Laravel, JWT OAuth, UK Company Experience, Japanese Clients 📩 Looking for a senior Laravel engineer who can own the entire lifecycle — code, deploy, lead, and manage? Invite me today. Let’s build something great.