With over 5 years of experience building multiple mobile apps for companies that generate 8-figures or are just starting out, and with an average rating of 4.9 stars from over 200 app reviews, our mobile apps speak for themselves.

I've been working for the California Department of Food and Agriculture for about 10 years now developing enterprise mobile apps for various state government functions. I maintain a total of 6 apps currently for the State, all of which are fairly complex projects integrating Core Data with various web services. The apps are mostly concerned with inspection services and regulatory enforcement. Most of the applications include GPS functionality, as well as bar code scanning using the device camera. I have a lot of experience working with designers to create pixel perfect implementations using Figma or other mockup tools. It's been a while since I've picked up any side work, but I'm excited to take on some new projects while I mull over my next idea for an app of my own!

I've been a Senior Full Stack Software Engineer for 15 years, deeply engaged in coding and tackling challenges. My motivation stems from a passion for solving problems and the continuous pursuit of knowledge. Throughout my tech journey, I've focused on turning ideas into reality. I work with PHP and robust frameworks like Laravel, Zend to build the foundational aspects of web applications. In addition, I leverage the power of Node.js to build scalable and efficient server-side solutions and enhance the overall architecture of web applications. I'm particularly enthusiastic about using React and Next.js, as they allow me to develop highly responsive and efficient web pages, offering a seamless user experience across all devices. For data management, I rely on databases like MySQL and MongoDB. Redis is my choice for enhancing performance through fast data access, ensuring quick and reliable data retrieval for web applications. If you have an exciting project or idea, I'm eager to hear about it. Let's collaborate and bring it to life!

Hi, I’m Faisal—a senior VoIP, CPaaS, and communications systems architect with 25+ years of experience designing carrier-grade, high-availability, real-time communication platforms. I build, scale, secure, and modernize voice and video systems for telecom operators, SaaS platforms, AI startups, CPaaS providers, and enterprises around the world. If it involves SIP, RTP, WebRTC, LLMs, Linux, CPaaS, or real-time media at scale, I can build it, optimize it, or rescue it. 🔑 What I Specialize In ✅ VOIP Platform Architecture (FreeSWITCH / Asterisk / Kamailio) ✅ Linux System Engineering, Security, and Optimization ✅ SIP, RTP, WebRTC, STUN/TURN, NAT Traversal ✅ Real-Time Communication (Voice & Video) at Scale ✅ AI-Powered Voice Bots, Transcription, and TTS Integration ✅ Troubleshooting SIP Call Flows, Packet Capture & Analysis (Wireshark/sngrep) 🔑 What I Do: VOIP & Real-Time Communication Architecture; FreeSWITCH / Asterisk / Kamailio / OpenSIPS platform design Carrier-grade SIP routing, NAT traversal, media handling High-availability + auto-scaling VoIP infrastructures Multi-tenant PBX, call center, and UCaaS platform development CPaaS Development & Integrations; Twilio, Plivo, Telnyx, Vonage, MessageBird Build SMS/voice/WhatsApp automation & workflows Replace/optimize expensive CPaaS architecture with self-hosted systems AI Voicebots, LLM Automation & Speech Tech (AI Integrations); Real-time voicebots using Whisper, Riva, Deepgram, Azure, ElevenLabs SIP → AI → SIP conversational call flows Real-time transcription + diarization + TTS pipelines LLM-powered call automation (ChatGPT Voice, RAG, custom models) WebRTC Application Engineering; Build custom WebRTC softphones (browser, React, Flutter) WebRTC signaling integration (SIP, custom protocols) TURN/STUN/ICE infrastructure setup QoS optimization for video/voice over WebRTC SIP Security, Hardening & Compliance; Anti-fraud protection, SIP scanning mitigation Fail2Ban, firewall tuning, SRTP/DTLS encryption STIR/SHAKEN setup & routing compliance Carrier-grade security audits & penetration checks DevOps for Real-Time Media Platforms; Docker/Kubernetes containerized VoIP workloads Auto-scaling SIP clusters, distributed media servers Monitoring with Netdata, Homer, Prometheus, Grafana CI/CD automation for telecom systems Outbound Dialers & Contact Center Systems; Predictive/preview dialers (custom-built or integrated) CRM telephony integration (HubSpot, Salesforce, Zoho) IVR, call routing, analytics dashboards Telephony Cost Optimization & Migration; Reduce Twilio/Telnyx billing by 40–70% Move from hosted CPaaS → self-hosted SIP infrastructure SIP trunk cost optimization strategies Emergency VoIP Platform Rescue; SIP call failure resolution One-way/no-audio fixes NAT, RTP, firewall, WebRTC troubleshooting 24–48h critical system recovery 🛠️ Tools & Stack VOIP Engines: FreeSWITCH, Asterisk, Kamailio, OpenSIPS Linux Distros: Ubuntu, Debian, CentOS, Alpine Protocols: SIP, RTP, SDP, SRTP, ICE, DTLS, WebRTC Monitoring: sngrep, Homer SIP Capture, Fail2Ban, Netdata DevOps: Docker, Ansible, Kubernetes (Cloud-Native VOIP) 🧠 Why Clients Work With Me 25+ years in telecom & VOIP architecture Built and scaled platforms like VdoTok using FreeSWITCH + WebRTC Performance-tuned Linux servers to handle millions of calls securely Helped startups and enterprises launch, scale, and secure VOIP stacks Expert in carrier interoperability, DID routing, and multi-tenant PBX 🧾 Sample Engagements 🔹 Migrated a legacy PBX to FreeSWITCH with SIP trunking and HA setup 🔹 Built a custom WebRTC softphone connected to Asterisk 🔹 Hardened VOIP infrastructure for international carrier with Linux + firewall tuning 🔹 Developed voice bot with NVIDIA RIVA and integrated it with SIP via FreeSWITCH 📞 Work With Me Whether you need to: Build a complete real-time communication platform Integrate AI voice bots into SIP/WebRTC Optimize or scale a VOIP system Reduce telephony costs Rescue a failing carrier-grade deployment 📞 Let’s Connect Whether you need to optimize your VOIP system, migrate to FreeSWITCH, or troubleshoot deep Linux-based issues, I can step in quickly and deliver solutions that scale and perform. 📅 I’m available for short consultations, full system builds, and long-term projects. Let me know when you're available for a quick Zoom or chat—I'm open Monday through Friday.

Sandeep Kundu (Mr. S) | Senior Fullstack Developer With over 15+ years of extensive experience in web and mobile development, I specialize in delivering high-quality solutions that meet clients' needs while ensuring efficiency, scalability, and maintainability. My expertise spans various technologies and frameworks, allowing me to approach complex challenges with innovative solutions. Core Expertise: - Backend Development: Node.js, Next.js, Nest.js, Laravel, Django, CakePHP, Flask, Big Data, ElasticSearch, and more. - Frontend Development: React, Angular, Vue.js, HTML5, CSS3, JavaScript (ES6), TypeScript. - CMS Development: WordPress, Magento, PrestaShop, Shopify, Joomla. - Mobile App Development: Native iOS (Swift, Objective-C), Android (Java, Android SDK), React Native, Flutter, Hybrid apps with back-end integration (Node.js, Laravel, CakePHP). - Cloud Services: AWS EC2, payment gateway integration, and various API integrations (REST, SOAP, XML, JSON). - Database Management: SQL, NoSQL (MongoDB), performance optimization, and tuning. - Version Control & Collaboration: Git (GitHub, SVN), Jira, Trello, Basecamp. Technical Contributions: 1. MERN Stack Proficiency: Developed API servers using Node.js and Express with MongoDB, complemented by frontend development in React.js with TypeScript, ensuring seamless, responsive web applications. 2. Nest.js & Next.js Mastery: Built scalable, secure, and optimized server-side applications using Nest.js, while leveraging Next.js for server-side rendering (SSR) and static site generation (SSG) for improved performance and SEO. 3. Modular Architecture: Adopted a modular approach for both backend and frontend developments, enhancing scalability, ease of maintenance, and ensuring smooth integration of various features. 4. State Management & Middleware: Expert in using Redux with Next.js for efficient state management and Redux-Saga for handling complex side effects in applications. 5. Performance Optimization: Focused on optimizing both frontend and backend performance to ensure fast, responsive user experiences. 6. Advanced UI/UX Design: Skilled in styling with CSS Modules, SCSS, LESS, and AntDesign, delivering modern, responsive, and visually appealing web designs. Work Ethic and Approach: - Client Satisfaction: I ensure clear communication and client approval at every project phase, including scope, design, and development, ensuring alignment with client expectations. - Attention to Detail: I pride myself on my meticulous approach to development, focusing on quality and scalability while delivering results on time and within budget. - Continuous Improvement: Always eager to learn and stay updated with emerging technologies, I apply this knowledge to solve complex technical challenges efficiently. - Availability: I am available 24/7 via Skype/Slack/Email, ensuring constant communication and prompt resolution of any project-related issues. Feel free to reach out to me via Upwork messaging, Skype, Slack, or Email for any inquiries. I look forward to collaborating on your next project.

🚀 Expert AI/ML Engineer with 5+ years in AI & Machine Learning, specializing in NLP, Computer Vision, AI Agent Development, Python, Chatbot Development, Natural Language Processing, AI ChatbotRAG, n8n and Generative AI. Skilled in designing, optimizing, and deploying scalable ML solutions across industries and proven track record in Healthcare, Finance, & E-commerce AI Solutions 🎖My approach to creating high-quality software is always based on the following standards🎖 ⚡I always follow clean code (MVVM) principles. ⚡A responsive code ensures a good user experience. ⚡Using version control systems effectively is one of my strengths. ⚡Each step of the development process is committed separately. ⚡Creating CI and CD pipelines to improve the development experience. ⚡For E2E and unit testing, I always use Selenium and Cypress. 👨‍💻 What I Offer: ✅ AI-Powered Chatbots & Virtual Assistants (GPT, LLMs, OpenAI, Hugging Face) ✅ Natural Language Processing (NLP) & Automatic Speech Recognition (ASR) ✅ End-to-End AI/ML Model Development & Deployment (MLOps, MLFlow, Airflow) ✅ Recommendation Systems & Predictive Analytics (PyTorch, TensorFlow, Scikit-Learn) ✅ Cloud & Scalable AI Solutions (AWS, GCP, Azure ML, Docker, Kubernetes) 🔍 Recent AI/ML Projects: ✔️ Conversational AI Bot: Fetched Zoom calls, transcribed using Whisper Model, extracted insights using NLP & LLMs, and generated abstractive summarization. ✔️ AI-Powered Email Automation: Leveraged GPT Models to generate dynamic lead emails based on custom data. ✔️ Fraud Detection System: Built ML-based fraud detection models for financial services, increasing fraud detection accuracy by 30%. ✔️ Healthcare AI: Developed Medical Image Classification models for diagnosing conditions from X-rays. 🎖Technical Skill Set 🎖 ✔Machine Learning & Deep Learning Frameworks: TensorFlow, PyTorch, Scikit-Learn, Keras, XGBoost and many similar other ✔Data Manipulation & Analysis: Pandas, NumPy, SciPy ✔APIs & Web Development: FastAPI, Flask/Django, REST API/RESTful APIs, Docker, Kubernetes. ✔Programming Languages: Python, R, JavaScript/TypeScript. ✔Database: MySQL, SQL, NoSQL. ✔Cloud Platforms: Google Cloud Platform (GCP), Microsoft Azure ML, AWS SageMaker ✔Natural Language Processing & Big Data: Apache Spark, Apache Flink, Hadoop, Databricks ✔Project management tools:- Slack, Twilio, Jira. Trello, GitHub, Bitbucket, Azure DevOp 📩 Let’s Discuss Your AI/ML Project! 🚀

I've been developing and designing native iOS and Android apps since 2012. I've helped businesses, organizations, and individuals build their ideas and reach their goals. I've built variety of apps with wide range of technologies on iOS and Android. I'm looking forward to help you and work with you to bring your vision to reality. Here is an outline of type of work and technologies I've used in apps: - UI Designs, wireframes, and mockups. - IoT and interfacing consumer devices to mobile applications via Bluetooth (BLE) for iOS and Android. - Design Firebase and Firestore backend database. - Firebase Cloud Functions and Messanging. - AWS AppSync and GraphQL APIs. - AWS Amplify backend integration. - Amazon Cognito for identity and access management. - iOS Shortcuts, app intents, and App Clips. - iOS and Google Wallet and Passes. - (Android) SQLite and Room: database to store data locally - (iOS) Swift Data, Core Data, and Realm databases to store data locally - RESTful APIs - SOAP APIs, a secured, reliable, and robust networking protocol for bank and enterprise communications. - Machine Learning and AI features. - AR and Vision features to show interactive objects and apps in your vision device or phone. - Image editing. - Chats and related social features. - Device motion censoring. - Restaurant/Cafe Menu. - Social media integration and authentication. - In-app purchases. - Payment processors. - Android Widgets. - Push Notifications. - Map APIs - Geofencing and geolocation features. Such as, setting a reminder point on the map, searching parking spots, and storing location based media or memos. - Building a location-based marketplace.

I help teams turn AI ideas into working, evaluated, product-ready workflows. If you need an LLM app, RAG workflow, agentic prototype, AI product strategy, or a practical build/no-build recommendation, I can help you move from "we should use AI" to a working plan, prototype, and next decision. I bring an uncommon mix of product leadership, UX judgment, and hands-on build fluency: - VP Product Manager, AI in MLIO at JPMorgan Chase - Former VP User Experience, AI across regulated banking workflows - Former Microsoft AI product designer during the Microsoft/OpenAI partnership era - Microsoft Global Hackathon winner - 60 Upwork projects, $200K+ earned, Expert-Vetted - Portfolio across enterprise AI, healthcare AI, financial services, marketplaces, SaaS, and product systems What I can help with: - LLM product strategy and opportunity assessment - RAG workflow design and prototype planning - Agentic workflow design with human-in-control guardrails - AI evaluation plans, success criteria, and readiness checklists - OpenAI / Anthropic / LangChain-style prototype direction - Product UX for AI assistants, copilots, dashboards, and internal tools - Executive-ready AI roadmap, risk, and implementation recommendations Typical deliverables: - AI workflow audit - Use-case prioritization matrix - LLM/RAG architecture sketch - Prototype scope and build plan - Prompt/system design recommendations - Evaluation and quality checklist - Product requirements and implementation roadmap - Working MVP or prototype when the scope is clear I am especially useful when a team has a real business workflow, messy requirements, security or governance concerns, and needs someone who can bridge product, design, engineering, AI capability, and executive decision-making. Best fit projects: - AI prototype or MVP for a defined workflow - RAG or LLM feature inside an existing product - Agentic workflow planning before build - AI readiness review for a product, team, or operation - Product strategy for AI-enabled SaaS, CRM, internal tools, or service operations If you want a flashy demo with no operational thinking, I am probably not the right fit. If you want practical AI work that can survive real users, real constraints, and real decision-makers, I can help.

7+ years of UX/UI design experience across SaaS platforms, B2B & B2C products, enterprise admin dashboards, and mobile apps, including big clients such as Trimble, Nestle, and Mondelez. 💎 Top 1% Rated Designer on Upwork ✅ 140+ projects across SaaS, e-commerce, fintech, healthcare and enterprise products ⏳ 2,232 hours delivered – consistent quality, clear communication, and reliable results 𝗪𝗛𝗬 𝗠𝗘? I design products that are not just visually sharp but strategically built to convert, retain, and scale. 🌍 Location: Barcelona, Spain (Local time: GMT +2) 𝗪𝗛𝗘𝗥𝗘 𝗠𝗢𝗦𝗧 𝗗𝗘𝗦𝗜𝗚𝗡𝗘𝗥𝗦 𝗦𝗧𝗢𝗣, 𝗜 𝗞𝗘𝗘𝗣 𝗚𝗢𝗜𝗡𝗚 Most designers hand you a Figma file and wish you luck. I don't stop there. I own the full loop — research, IA, high-fidelity UI, and what happens after ship — because my focus isn't "does it look good," it's "did it move the business forward." And I build, not just design. Need a website live? I design it and launch it myself — Webflow, Framer, WordPress, Shopify, Squarespace, or Wix — no handoff to a separate developer, no gap where things get lost in translation. Need a working prototype fast, not just clickable screens? I use Cursor and Claude Code to turn designs straight into functioning code. One person, one process, no bottlenecks between design and something real in your hands. 𝗖𝗢𝗥𝗘 𝗙𝗢𝗖𝗨𝗦 The clients I work best with are product teams and founders who need a UX/UI designer operating at both strategic and execution levels. I am equally comfortable running a UX audit, building a design system from scratch in Figma, or owning the full web design process from brief to handoff. My creative direction background means I think about brand, narrative, and conversion alongside usability. 𝗠𝗬 𝗦𝗘𝗥𝗩𝗜𝗖𝗘𝗦 𝗜𝗡𝗖𝗟𝗨𝗗𝗘 🔍 UX research & flow mapping 🖥️ SaaS & B2B admin dashboards — filters, data tables, permission flows 📱 Mobile app UX/UI (iOS & Android) 🌐 Website design & full builds (Webflow, Framer, WordPress, Shopify, Squarespace, Wix) 🧩 Design systems — Figma variables + dev handoff docs 📋 UX audits — prioritized, written reports 𝗧𝗢𝗢𝗟𝗦 𝗧𝗛𝗔𝗧 𝗜 𝗨𝗦𝗘 🎨 Design & No-Code: Figma (expert) · Adobe XD · Illustrator · Photoshop · Miro · InVision · Zeplin · Axure · Webflow · Framer · WordPress · Shopify · Squarespace · Wix 🤖 AI: Figma Make · ChatGPT · Claude · Midjourney · Cursor · Claude Code 💬 Communication & Workflow: Slack · Notion · Loom · Zoom · Google Meet · Jira Based in Barcelona, working in English, Spanish, Russian and Ukrainian — easy overlap with EU and US hours. Tell me about your project — I'll reply shortly!

Hi there! I’m Mujtaba Kiani, a Project Manager and Technical Lead with over 13 years of experience helping businesses bring their ideas to life through smart, scalable technology. I started my journey as a developer, which gave me a solid technical foundation. Over time, I moved into project leadership and operations, where I’ve managed cross-functional teams across SaaS, enterprise software, and AR/VR projects delivering more than 25 successful products worldwide. My strength lies in bridging business goals with technical execution making sure projects are delivered on time, within budget, and with clarity at every step. I use Agile and Scrum methodologies, and I’m experienced with tools like Jira, Asana, Monday.com, and Azure DevOps to keep projects running smoothly. I’m passionate about process optimization, automation, and clear communication because great results come from structure and teamwork. If you’re looking for someone who can lead your project end-to-end, align your teams, and deliver quality results, let’s connect. I’d love to help you turn your vision into a successful, working product.