Your backend shouldn't be the reason your product fails to scale. I'm Hamza, a Backend Engineer with 5+ years building production-grade Django systems that handle real traffic, real complexity, and real business logic. I've helped scale applications from 200 to 100,000 concurrent users without rewriting everything from scratch. What I've delivered: ✅ Rebuilt an entire legacy platform (v1 to v2) with zero-downtime migration, running both systems in parallel using automated daily data sync until the new version was fully live ✅ Built a real-time ride-sharing platform using Django Channels and WebSockets with live driver tracking, rider-driver matching, and socket-based location updates ✅ Designed RAG-based AI chatbots trained on company knowledge bases with seamless live agent escalation via Twilio Flex ✅ Built multi-path SMS and voice automation (Twilio Studio, Flex, TaskRouter) handling service requests, onboarding, and real-time agent routing through a single number ✅ Integrated Stripe programmatic invoicing, subscription billing with off-session renewals, and 3D Secure authentication ✅ Architected multi-tenant SaaS systems with row-level isolation, custom middleware, and shared database architecture serving multiple client segments What I built for you: → REST APIs with Django REST Framework (clean, documented, versioned) → SaaS backend architecture and multi-tenant systems → Real-time features with Django Channels and WebSockets → AI integrations, RAG chatbots, LLM workflows, automation pipelines → Twilio (Flex, Studio, IVR, SMS, WhatsApp) communication systems → Stripe and payment gateway integrations → Database design and query optimization → Celery task queues, cron jobs, and background automation → Legacy system refactoring and zero-downtime migrations I don't do quick fixes. If you're building something serious and need a backend engineer who focuses on long-term architecture, not just closing tickets, send me a message with your project details and I'll get back to you within 24 hours.

I'm a Frontend Developer with 4+ years of experience building fast, responsive, and scalable web and mobile applications using React.js and React Native. What I bring to your project: ✅ Frontend Development — Building clean, performant UIs with React.js, JavaScript (ES6+), HTML5, and CSS3 ✅ Mobile App Development — Cross-platform apps using React Native ✅ State Management — Redux Toolkit, Redux Saga, and MobX for predictable, scalable app architecture ✅ Styling — Tailwind CSS, Sass, and Bootstrap for pixel-perfect, responsive design ✅ Backend Integration — Node.js and REST APIs for seamless frontend-backend connectivity ✅ Database — MongoDB and Firebase for data storage and real-time syncing ✅ Real-Time Features — PubNub SDK integration for live chat, notifications, and real-time updates ✅ Performance Optimization — Code splitting and lazy loading for faster load times and better UX ✅ Design Collaboration — Figma to code, working closely with designers for accurate implementation ✅ Version Control — Git/GitHub for clean, collaborative workflows I focus on writing maintainable code, meeting deadlines, and clear communication throughout the project. Whether you need a complete web app, a mobile app, or just frontend support on an existing project, I'm ready to help bring your idea to life. Let's discuss your project — message me anytime!

𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐑𝐞𝐚𝐜𝐭 | 𝐍𝐨𝐝𝐞.𝐣𝐬 | 𝐏𝐲𝐭𝐡𝐨𝐧 | 𝐒𝐚𝐚𝐒 | 𝐀𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 𝐄𝐱𝐩𝐞𝐫𝐭 I’m a full-stack developer with a passion for turning ideas into clean, functional web and mobile apps. Whether it’s an iOS/Android app or a fast, scalable web platform. I can help you build it from the ground up or jump in mid-way and bring it to the finish line. I work with modern stacks like React, Next.js, Node.js, Django, React Native, Firebase, and AWS. From dashboards to marketplaces and real-time tools, I’ve built a range of products as per client needs. If you have an idea, a rough draft, or an unfinished build. I can help shape, refine, and launch it. I don’t just execute tasks I bring suggestions, think ahead, and care about the end result. Looking for a Full Stack Developer who blends technical excellence with a strategic, business-first mindset? I specialize in building robust, high-performance apps—whether you need a cross-platform mobile app, AI-integrated chatbot, SaaS dashboard, or scalable backend API. 👉 Services Offered: 𝟏. 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React.js, Next.js, Vue.js, Angular, TypeScript, Svelte Node.js, Nest.js, Python, Express.js, Django, Flask, GraphQL, REST APIs 𝟐. 𝐀𝐈/𝐌𝐋 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 & 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧: OpenAI (GPT), LangChain, Zapier, AI-powered chat interfaces, automation workflows, personalized recommendation engines 𝟑. 𝐒𝐚𝐚𝐒 𝐏𝐫𝐨𝐝𝐮𝐜𝐭 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: CRM, ERP, healthcare portals, job boards, inventory & logistics solutions 𝟒. 𝐂𝐫𝐨𝐬𝐬-𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩𝐬: React Native, PWA, Bluetooth apps, real-time features, location tracking 𝟓. 𝐑𝐞𝐚𝐥-𝐓𝐢𝐦𝐞 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬 & 𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐓𝐨𝐨𝐥𝐬: Firebase, Twilio, PubNub, WebSockets, in-app notifications 𝟔. 𝐏𝐚𝐲𝐦𝐞𝐧𝐭 𝐆𝐚𝐭𝐞𝐰𝐚𝐲𝐬 & 𝐄-𝐜𝐨𝐦𝐦𝐞𝐫𝐜𝐞 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬: Stripe, Razorpay, PayPal, secure checkout flows, scalable product architecture 𝟕. 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐂𝐥𝐨𝐮𝐝 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭: CI/CD pipelines, AWS (Lambda, Cognito, EC2, S3, Amplify), GCP, Docker, scalable cloud architecture 𝟖. 𝐌𝐨𝐧𝐢𝐭𝐨𝐫𝐢𝐧𝐠 & 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧: Sentry, Rollbar, Datadog, Honeybadger, speed and reliability enhancements 𝟗. 𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: MongoDB, PostgreSQL, MySQL, MariaDB, DynamoDB – optimized schema & querying 𝟏𝟎. 𝐒𝐨𝐜𝐢𝐚𝐥 𝐌𝐞𝐝𝐢𝐚 & 𝐓𝐡𝐢𝐫𝐝-𝐏𝐚𝐫𝐭𝐲 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: YouTube, Facebook, Instagram, GPS, Maps, QR/Barcode scanning 🎯 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: 1 ) I write clean, maintainable code not quick fixes 2 ) I’m easy to work with, communicate clearly, and respect deadlines 3 ) I can jump in at any stage: from scratch, mid-project, or for post-launch improvements 4 ) I stick around if you need future updates or features, I’ve got your back 📌 𝐓𝐨𝐩 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: React Developer, Full Stack Engineer, Node.js Expert, SaaS Specialist, Python Developer, AI Chatbot, GPT Integration, Zapier Automation, CRM/ERP Developer, Stripe Integration, Cloud DevOps, Fintech & Healthcare Software, Reusable Component Developer Ready to transform your idea into a high-performance product? 📩 Let’s connect and build something great starting today!

I help mobile game and real-time product teams build backends that survive launch-day spikes, shut down cheaters, and keep in-app revenue airtight. 8+ years building and operating live game servers on Python/Django and AWS, for a title with millions of players. What I can do for you: High-scale game backend: matchmaking, leaderboards, real-time state sync (PubNub/WebSocket), low-latency APIs Revenue & economy integrity: IAP receipt validation (Apple/Google), virtual currency ledgers, anti-cheat & fraud detection LiveOps systems: events, A/B configs, player segmentation, live config changes without redeploys AWS architecture: EC2, DynamoDB, SQS, ALB, auto-scaling — designed for cost and P99 latency, not just "it works" Observability & on-call: Datadog/Sumologic dashboards, alerting, production incident response Why me: 8 years on a live, top-grossing mobile game means I've already debugged the problems that only appear at scale — currency-duplication exploits, receipt-replay fraud, traffic spikes that melt naive architectures. I ship production-ready code (Python, .NET), obsess over idempotency and data integrity, and communicate clearly in writing. Stack: Python · Django · .NET · AWS (EC2, DynamoDB, SQS, ALB) · Redis · PubNub · MySQL · Datadog · Sumologic Tell me what's breaking or what you're launching — I'll reply with a concrete plan, not a sales pitch.

Over 22 years of experience working on enterprise class systems. Variety of projects and customers. Always focused on performance and reliability. Always on cutting edge of technology. Keeping in mind business objectives and customers interests. Competencies: • Solution Selection, Architecture Design, Implementation, Customization, Migration, Internal Adoption - Freelance Consulting & Audit BigData & Machine Learning Expertise: • Machine Learning Models adoption from business use-case until production maintenance • Data Collection, Data pipelines, Data Workflows • Big Data ETL & Mining • System Integration I have a solid portfolio of enterprise level, successfully implemented solutions as well as ad-hoc optimizations of existing systems in large, global organizations.

I am a Full Stack Developer, Author, Part-Time Consultant, and a Full-Time Learner, working on applications that scale. I've close to 10 years of experience in the Software Industry with immense experience in Java, JavaScript, Spring, Spring boot (micro-services), AWS (Cloud, dynamo db, Cognito, pinpoint.. etc) PubNub, Redis, React(Hooks, Redux, Redux-Saga, Redux-Form, React-hook-forms, React Queries, StorybookJS, nextJS, nodeJS). Areas of Expertise: 1. Data Structures and Algorithms 2. Java, Javascript Programming. 3. Jive SBS(Social Business Software) - 4.x, 6.x, 7.x, 8.x, and 9.x versions. (Jive on-premise, Jive Cloud & Jive Hosted) 4. Jive Addons, Tiles, Plugins, widgets, Integrations, SAML, themes & upgradations 5. Spring MVC / Spring Batch, Spring Boot 6. Professional JavaScript and node.js developer. 7. React, Redux, Thunk, etc.. HTML5, CSS 8. Webpack, Babel, pm2, Unix, PostgreSQL, MongoDB 9. Digital Collaboration/Social-Media Domain, Educational Domain. 10. Versioning Systems: GIT

I enjoy the challenge of solving complex problems—much like a game of chess where every move matters. With 19+ years of experience in software engineering, I have worked across a wide range of technologies, helping organizations design, build, and scale reliable software systems. Over the years, I’ve held senior engineering and leadership roles, guiding development teams, defining technical strategy, and delivering high-impact solutions for businesses in e-commerce, government, healthcare, and fintech. My focus is not only writing high-quality code but also building sustainable architectures, strong engineering practices, and scalable systems. In recent years, my work has increasingly involved modern data-driven and intelligent software systems, helping organizations integrate advanced technologies into practical, production-ready platforms. I focus on bridging the gap between emerging technologies and real-world business applications, ensuring systems are reliable, maintainable, and built to scale. I’m passionate about clean architecture, engineering leadership, and continuous learning, and I enjoy collaborating with teams that aim to build meaningful technology. Areas of Expertise • Software Architecture & System Design • Distributed Systems • Web & Platform Development • Mobile & Desktop Applications • DevOps & Cloud Infrastructure • Software Quality & Testing • Technical Leadership & Engineering Strategy Research Publication Incremental Symbolic Execution for Automated Test Suite Maintenance IEEE/ACM International Conference on Automated Software Engineering (ASE 2014) If you’re working on something ambitious and need experienced technical leadership or architecture guidance, I’d be glad to help.

A passionate and detail-oriented Full Stack Developer with over 6 years of experience building fast, scalable, and reliable applications across web and mobile platforms. I specialize in modern technologies like Ruby on Rails, Laravel, React, Next.js, and React Native, delivering solutions that are not only technically sound but also user-centric and performance-optimized. From SaaS platforms to AI-powered mobile apps and custom WordPress plugins, I’ve worked with both startups and established businesses — remotely and onsite — to turn ideas into fully functional products. 🛠️ Tech Stack: ܍ Frontend: React, Next.js, Tailwind CSS, Bootstrap ܍ Backend: Ruby on Rails, Laravel ܍ Languages: JavaScript, TypeScript, Ruby, PHP ܍ Mobile: React Native, Expo ܍ Databases: PostgreSQL, MySQL ܍ DevOps & Tools: Heroku, AWS, Git, GitHub, Bitbucket ܍ Testing: RSpec, Capybara ܍ Integrations: Stripe Connect, Twilio, PubNub, QuickBooks, One Signal, WildApricot (SSO) ܍ Others: WordPress Plugin Development, RESTful APIs, Third-party API Integrations, CI/CD Pipelines 💬 Let’s Work Together If you're looking for a reliable, technically skilled, and business-aware developer, I’d love to hear more about your project. Whether you need backend architecture, frontend polish, or API magic, I’ve got you covered. 📩 Let’s connect and build something great together!

✅ Top Rated Mobile App Developer ✅ 100% Job Success ✅ Money Back Guarantee ✅ Fluent English Dear Visitor. Greetings of day! I'm Alan Schulz based in Zwickau who has rich experience in software development. Over the last 7+ years, I've built 60+ iOS, Android apps and they were published to Apple store and Google play store as well as high-ranked. I am working as an individual or with working mates, supporting full time. Rough quote will be ready within an hour, If it is acceptable for you, I will prepare detailed project development plan indicating timeline and budget. My Skill area : - iOS 8, 9, 10, Android, Apple TV, Apple Watch - Ionic/Ionic 2/Phonegap/Cordova/Titanium/Xamarin/Cordova/React Native - Familiar with Objective-C, Swift, Java, JSON, PHP, Javascript, MySQL - 3rd Party SDK (Facebook, Twitter, Google Map, Instagram, LinkedIn, Paypal & Credit Card, Parse, Gracenote, Deezer, Quickblox, Firebase, PubNub) - Github, Bitbucket, Jira, Trello, Testflight I always make sure to bring you upon successive to results of highly and creatively qualified results before your deadline and guarantees refunding for any unsuccessful results or issues which are responsible for me. I am seeking an opportunity to become a business partner with long-term relationship. Best with Regards, Alan.

Hi Thank you for visiting my profile. I have been developing iOS/Android Apps for over 6 years in great Mobile Company in Ukraine. Main focused on the Tinder like Dating apps, WhatsApp like Chatting apps, Video conference Apps and web-based mobile applications with XMPP, Openfire, OpenTOK, PubNub, Quickblox, WebRTC, RTMP/RTSP/HLS, Restful Web services, MapKit, JSON data encoding/decoding and web backend apis. My main skills: - Media Streaming: Wowza, SoundCloud, HLS, RTMP, FFMpeg, H.264, H.323, VP8, MPEG-4, Speex, G.723, G.729, gstreamer, vlc, JWPlayer, ExoPlayer - Social Network: Facebook, Twitter, LinkedIn, Instagram, Youtube, Pinterest, Vimeo, Google+ - Chat & Messaging Engine: XMPP, Jabber, Openfire, OpenTok, WebRTC, Quickblox, Jabber, Ejabberd - Video Conference: VOIP, SIP, Asterisk, FreePBX, VicDial, OpenSIPS, Kamailio, Freeswitch - Video/audio/image processing: OpenCV, GPU Image, CoreAudio, EZAudio, Pitch Control, Bass, AVFoundation - Web Service: XML/JSON, REST/SOAP - Cloud backend: Parse.com, Parse SDK, Parse REST, Parse Cloud Code, Amazon S3 EC2 AWS, Firebase, Twillio - Place Service: Google Map, Foursquare, Yelp, Geolocation, GPS - Cloud services: iCloud, Rackspace, Azure, AWS, EC2, Dropbox - Back-end: RESTful API, Parse.com, Amazon Web Service & Amazon S3, GAE, XML, JSON - Source control: Mantis, BaseCamp, Huddle, Git, Github, Bitbucket I am always looking forward to long-term relationship based on client satisfaction!