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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.

𝐇𝐢, 𝐈’𝐦 𝐖𝐚𝐣, 🚀 I’m a Full Stack Developer focused on building scalable SaaS platforms, AI systems, and modern web applications using React, Node.js, JavaScript, Python, and TypeScript. I work across the entire product lifecycle from UI/UX to backend architecture, databases, APIs, cloud deployment, and AI integrations. 💻 On the frontend, I build fast, responsive, and modern interfaces using React, React Native, Vue.js, Angular, HTML, HTML5, CSS, CSS 3, Bootstrap, Tailwind CSS, jQuery, and Responsive Design. I also focus heavily on Web Design and Web Application development with strong attention to performance and usability. ⚙️ On the backend, I develop robust and scalable systems using Node.js, ExpressJS, Python, Django, FastAPI, PHP, Laravel, RESTful APIs, GraphQL, and API Integration. I design systems that are clean, maintainable, and ready for long-term scaling. 🗄️ I work with powerful databases like PostgreSQL, MySQL, MongoDB, SQL, Redis, Supabase, and Firebase, building solid Database Architecture that supports high-traffic applications and complex SaaS products. 🧠 My core strength is Full Stack Development and SaaS engineering building MVPs, multi-tenant SaaS platforms, dashboards, CRMs, admin panels, and API-driven systems using Software Architecture & Design principles that keep products scalable from day one. 🤖 I also specialize in AI Chatbots, AI Agents, and AI Automation systems that actually integrate into real business workflows. I work with Artificial Intelligence, Machine Learning, NLP, Neural Networks, Computer Vision, Data Science, and Bot Development to build intelligent systems that automate real operations. 🧩 My AI stack includes OpenAI (GPT), ChatGPT, Claude, Gemini, LangChain, LangGraph, Vercel AI SDK, MCP, CrewAI, and LLM-based systems. I also use tools like Cursor, Claude Code, Lovable, Retell.ai, Bolt.new, v0.dev, Replit Agent, and GitHub Copilot to speed up development and prototyping without compromising quality. 🔗 I build powerful automation and integrations using Make, n8n, Zapier, HubSpot, Salesforce, Airtable, Slack, Twilio, WhatsApp Business API, and webhook systems that connect your entire business ecosystem. ☁️ On the infrastructure side, I work with AWS, GCP, Azure, Docker, Kubernetes, CI/CD pipelines, GitHub Actions, serverless architecture, and cloud deployments to ensure your application is scalable, secure, and production-ready. 🔐 I also implement secure, enterprise-grade systems using OAuth, JWT, IAM, RBAC, and compliance-ready architectures like HIPAA, HL7, and FHIR where needed. 📦 I’ve delivered SaaS platforms, AI systems, booking platforms, dashboards, automation tools, and enterprise-grade applications used in real production environments. My focus is always the same: build systems that are stable, scalable, and built to last. ✅ What you get working with me: • Clear system architecture before development starts • Fast MVP delivery with scalable foundations • Clean, maintainable, production-ready code • Transparent communication and ownership mindset • Solutions focused on real business impact, not just code 💡 If you’re looking for a Full Stack Developer, React Developer, Node.js Developer, Python Developer, SaaS Engineer, AI Chatbot Developer, or AI Automation Specialist who can take your idea from concept to production let’s connect and build something powerful together. React Developer, React Native, React js, React Native Developer, React Node, React Redux, React Js Developer, React Native expert, React angular, React Front end, Full Stack Developer, Full Stack Web Developer, Full Stack Wordpress Developer, Full Stack Web, Full Stack Development, Full Stack Php, Full Stack php Developer, Full Stack WordPress, Full Stack Web Development, Python Full Stack Developer, Python full stack developer Django, Senior full stack developer. Full-Stack Development React JavaScript HTML5 CSS 3 CSS PHP Bootstrap Vue.js HTML WordPress jQuery Python Software Architecture & Design Full-Stack Development Laravel MySQL Software Development Database Architecture API Web Application API Integration Tailwind CSS CodeIgniter SQL Angular RESTful API MongoDB React Native TypeScript Node.js ExpressJS Angular SQL Database Back-End Development AI Chatbot Chatbot Development ManyChat Chatbot Artificial Intelligence Machine Learning Neural Network Computer Vision MySQL Bot Development Natural Language Processing Data Science React PHP Node.js ExpressJS Laravel PostgreSQL SQL MySQL MongoDB Git Angular RESTful API API Integration Database Backend Development Express MongoDB TypeScript ExpressJS React Node.js MySQL MongoDB Vue.js Angular PostgreSQL Redis Firebase Supabase

🚀 𝗔𝗩𝗔𝗜𝗟𝗔𝗕𝗟𝗘 𝗧𝗢 𝗦𝗧𝗔𝗥𝗧 𝗧𝗢𝗗𝗔𝗬! 🔝Top 1% Talent on Upwork⚡️Updated daily ⚡️Fast task completion ⚡️Flexible work schedule ⚡️High-quality results ⚡️Increase in conversion 🥇 7-Years of experience as React, Next.js React Native & Expo App Dev As a successful team leader, I'm providing my technical and management skills to my team members wherever needed. I build 50+ high-performance React Native mobile apps for iOS and Android and production-ready 100+ web applications using React, Next.js, Vue.js, Angular TypeScript, Ember.js, and JavaScript, backed by scalable Node.js, AWS, and Python APIs and cloud infrastructure. Over the past 7+ years I have worked on apps that include: -AI-powered mobile and web applications using OpenAI, Gemini, and LLM APIs -Real-time apps with WebRTC, push notifications, and live updates -Scalable backend systems with Node.js, Express.js, AWS, RESTful API, and PostgreSQL -Secure authentication and KYC integrations (Clerk, Jumio, Onfido) -Payment systems with Stripe and subscription models -Mapping, location services, and logistics platforms using Google Maps & Mapbox -Responsive web dashboards, admin panels, and SaaS platforms using React, & Next.js, Vue, Ember.js -SEO-optimized landing pages and marketing sites with Next.js and TypeScript No‑code / AI‑assisted app: I transform prototypes from Base44, Bubble, FlutterFlow, Adalo, AppyPie, Glide, and Zite into fully native Android and iOS apps or high-performance web applications with push notifications, Stripe payments, API integrations, and a serverless backend. Ready for launch in just 10 days. My skills set: Mobile: React Native, iOS, Android Frontend: React, Next.js, Ember.js, Vue, Angular, TypeScript, Tailwind CSS Backend: Node.js, Express, AWS, Python, RESTful API Databases: PostgreSQL, MongoDB, Supabase, Firebase, Redis AI & ML: OpenAI API, Gemini, Anthropic, TensorFlow, Vector DBs (Pinecone, Weaviate, Qdrant) Cloud & Tools: AWS, Vercel, GitHub, CI/CD I believe myself quite an expert in programming, and I learn things very quickly. If you're building a mobile app, web platform, AI product, SaaS platform, or scalable backend, I can help you move from idea to production. Send me a message and Let's discuss how I can contribute to your project. GitHub: Awais-514

Full stack mobile app developer with 15+ years of experience in Mobile App Development, specializing in Flutter, React Native, React, IOS, Swift, Android, Python, and Java. I have successfully delivered 120+ mobile applications in different roles as flutter app developer, flutter full stack developer, flutter flow, ai mobile app developer, mobile app design, mobile ui ux designer, ios developer, android developer, react native developer, mobile game developer achieving a 5-star rating on Upwork and helping clients scale their businesses with high-performance solutions. 🚀 Flutter Mobile App Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer for Mobile app development project. Expert in Flutter mobile app development, delivering 30+ high-performance apps with pixel-perfect UI and smooth animations. Skilled in clean architecture and comprehensive testing for robust solutions. Experienced Mobile App Developer. 🔹 Applied game mechanics for engaging experiences in mobile development where I was a Mobile Game Developer. 🔹 Integrated real-time features, secure authentication, and cloud functions as Flutter Firebase Developer. 🔹 Built seamless API integrations and data synchronization in mobile development in Flutter mobile app development as a Flutter Laravel Specialist. 🚀 iOS app developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development: Developed and optimized 40+ iOS apps using Swift. Implemented complex features as iOS app developer, maintaining clean architecture and best practices. Leveraged extensive experience as iOS developer Swift to create intuitive user experiences and solve challenging technical problems. Collaborated with cross-functional teams as Swift iOS developer, utilizing Kotlin Swift expertise to deliver high-quality applications on time and exceed client expectations on iOS Swift smartphone platforms. 🚀 Android Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development: Built 30+ Android apps with adaptive UI, material design, and battery-friendly performance. Expert in Android Kotlin developer, leveraging Kotlin Swift and Kotlin Multiplatform for cross-platform solutions. Optimized security as Android reverse engineer and streamlined releases as Android app publisher, enhancing engagement and update efficiency. 🚀React Native Developer | Mobile UI/UX Designer | Mobile Game Developer | Mobile Web Developer in mobile app development: Built 20+ cross-platform apps with responsive UI and seamless sync. Expert in React Native mobile, React Native Expo, and React Native Firebase for real-time features. Optimized communication with React Native WebRTC. Crafted interactive experiences as React JS and Front End React specialist. Developed hybrid solutions as Java React expert, maximizing code reuse. 📱 Performance & Scalability: Built apps supporting 1M+ users, integrating real-time updates, gamification, and video streaming. 💰 Business Impact: Helped startups and enterprises generate $10M+ in revenue through well-optimized and engaging mobile applications. iOS App Development Case Study 📱 Developed a high-performance iOS app using iOS Swift that achieved 5 star rating and featured status in the App Store. Implemented Flutter iOS compatibility for future cross-platform expansion while maintaining native performance and security. Supported iOS app marketing efforts with analytics implementation and App Store optimization, resulting in 35% higher user retention than industry average. I am currently not accepting WordPress projects as I'm focusing exclusively on mobile app development. Professional Achievements 🚀 Rewarded as 🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 𝗣𝗟𝗨𝗦 🏆 🚀 4154 mobile app development hours on Upwork and still counting 🚀 100% Job Success in mobile app development (Client Satisfaction Ratio) 🚀 54+ mobile app development jobs completed successfully ✅ 98% of Clients Recommended working with me as with AI Mobile App Developer ✅ 80% Long-term Repeat Clients ✅ 15+ Years Of Experience in mobile app development, 6 years experience in Flutter mobile app development, 7 years experience in Swift and Kotlin, 4 years experience in React Native. ✅ High-Quality Work ✅ Cost-Effective AI Mobile App Developer ✅ Fluent English Verified ✅ 93% on-time delivery rate across all mobile app development milestones Got an app idea that you think is ready to make a splash? Let's dive in and explore it together in a free intro call

𝗔𝗩𝗔𝗜𝗟𝗔𝗕𝗟𝗘 𝗡𝗢𝗪 ✅ 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 𝗺𝗲 𝗮𝗻𝗱 𝗜'𝗹𝗹 𝗿𝗲𝗽𝗹𝘆 𝘄𝗶𝘁𝗵𝗶𝗻 𝗮 𝗳𝗲𝘄 𝗵𝗼𝘂𝗿𝘀. 🏆 Top Rated Plus | 95% Job Success Score 🏆 59 contracts completed | $200K+ earned on Upwork 🏆 50+ software products shipped since 2017 🏆 6 production AI products built in the last 2 years 🏆 Best Employee Award | won twice at the same company 💎 𝗜 𝗕𝗨𝗜𝗟𝗗 𝗣𝗥𝗢𝗗𝗨𝗖𝗧𝗜𝗢𝗡-𝗥𝗘𝗔𝗗𝗬 𝗔𝗜 𝗠𝗩𝗣𝗦 𝗔𝗡𝗗 𝗔𝗜 𝗔𝗚𝗘𝗡𝗧𝗦 𝗧𝗛𝗔𝗧 𝗦𝗛𝗜𝗣 𝗙𝗔𝗦𝗧, 𝗦𝗖𝗔𝗟𝗘 𝗖𝗟𝗘𝗔𝗡𝗟𝗬, 𝗔𝗡𝗗 𝗦𝗢𝗟𝗩𝗘 𝗥𝗘𝗔𝗟 𝗕𝗨𝗦𝗜𝗡𝗘𝗦𝗦 𝗣𝗥𝗢𝗕𝗟𝗘𝗠𝗦 💎 I'm Rehan, an AI Engineer based in London with 10+ years building SaaS platforms, mobile apps, and AI products for clients across the US, UK, and globally. Most founders don't need another prototype. They need a working AI product in users' hands. I take you from idea to live MVP: agent architecture, LLM integration, RAG pipelines, automations, and the full build, then iterate on real usage. 𝗪𝗵𝗮𝘁 𝗜 𝗯𝘂𝗶𝗹𝗱: ✔️ 𝗔𝗜 𝗠𝗩𝗣𝘀 - Idea to production in weeks. Full-stack build, LLM integration, deployment, and iteration on live user feedback. ✔️ 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁𝘀 - Autonomous and multi-agent systems with tool calling, MCP integrations, and memory. Voice, chat, and workflow agents that run unattended. ✔️ 𝗥𝗔𝗚 & 𝗟𝗟𝗠 𝗔𝗽𝗽𝘀 - Retrieval pipelines, vector search, structured outputs, evals, and guardrails wired into apps your users actually trust. ✔️ 𝗪𝗼𝗿𝗸𝗳𝗹𝗼𝘄 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 - n8n, Make, and custom agentic pipelines that cut manual work from weeks to minutes. ✔️ 𝗩𝗼𝗶𝗰𝗲 𝗔𝗜 - Real-time voice agents that qualify leads, book appointments, and handle inbound calls with zero human involvement. ✔️ 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 - Drop AI into your existing stack: CRMs, ERPs, payroll, invoicing, support, and internal tools. 𝗔𝗜 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝘀 𝗜 𝗵𝗮𝘃𝗲 𝘀𝗵𝗶𝗽𝗽𝗲𝗱: 🌟 𝗖𝗶𝘃𝗲𝘁𝘁𝗮 𝗣𝗿𝗼𝗽𝗲𝗿𝘁𝘆 𝗚𝗿𝗼𝘂𝗽 - Built an AI voice agent that qualifies inbound leads and books appointments automatically. Zero human involvement. Live in production. 🌟 𝗔𝗜 𝗦𝗮𝗻𝘁𝗮 𝗖𝗵𝗮𝘁 - Real-time conversational AI for children. Sub-second response, child-safety guardrails on every turn, parental oversight layer. Live on iOS and Android. 🌟 𝗶𝗤𝗛𝗥 - AI-first HR SaaS platform. Built core AI features against shifting, multi-stakeholder requirements and kept delivery on track. 🌟 𝗨𝗧𝗦𝗔 - University healthcare research tool. Built a side-by-side evaluation workflow comparing GPT, Claude, and Gemini outputs. 🌟 𝗧𝗿𝗶𝘃𝗮𝗻𝘁𝘂𝘀 - Replaced a manual Excel-and-email payroll process with automation that cut cycles from weeks to days. 🌟 𝗔𝗯𝗲𝗲𝗿𝗮 𝗟𝗶𝗺𝗶𝘁𝗲𝗱 - Shipped two live AI systems for a London tech firm: a front-desk voice agent and a QuickBooks invoice automation. 🌟 𝗕𝗹𝗲𝘀𝘀𝗻 - Faith-based creator SaaS. Built from concept to launch with Sightengine AI content moderation. 𝗦𝘁𝗮𝗰𝗸 𝗜 𝗯𝘂𝗶𝗹𝗱 𝗼𝗻: 🌟 Languages: Python, TypeScript, JavaScript, SQL 🌟 AI/ML: LangChain, LlamaIndex, OpenAI SDK, Anthropic SDK, Hugging Face, PyTorch 🌟 LLMs: Claude, GPT, Gemini, Grok, DeepSeek 🌟 RAG & Data: Pinecone, Weaviate, pgvector, ChromaDB, embeddings, vector search 🌟 Agentic: Claude Code, MCP, Replit, Lovable, Cursor 🌟 Voice AI: Vapi, Bland, Twilio 🌟 Automation: n8n, Make, custom Python pipelines 🌟 Backend: FastAPI, Node.js, REST APIs, webhooks 🌟 Frontend: React, Next.js, Tailwind 🌟 Cloud & Infra: AWS, GCP, Docker, Vercel, Firebase 🌟 Databases: PostgreSQL, MongoDB, Redis, Supabase 🌟 Integrations: Stripe, Sendgrid, QuickBooks, ERPNext, HubSpot 🌟 PM: ClickUp, Jira, Notion, GitHub, Figma, Linear 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀: Certified Scrum Master (CSM) | PME MSc Project Management | BSc Computer Science Available up to 30 hrs/week. Flexible timezone. What are you building? Send me a message and let's scope it.

Free Consultation – Let’s Build a Stunning Cross-Platform App Together! Hi there! I'm a Senior React Native and Flutter Developer with 5+ years of proven success building high-performance, scalable mobile apps for iOS and Android — including apps with 1M+ users. Whether you're looking to launch an MVP, scale an existing mobile product, or need help fixing complex bugs — I'm here to deliver clean, maintainable code and a rock-solid user experience. 🚀 What I Deliver ✅ Cross-Platform Mobile Apps (iOS + Android) using React Native / Expo/ Flutter ✅ Scalable & Maintainable Code Architecture (TypeScript + Modular Components) ✅ Performance Optimization, Debugging & CI/CD Pipelines ✅ App Store / Play Store Publishing & Post-Launch Support ✅ Seamless API Integration (REST / GraphQL / Firebase / Supabase) ✅ Real-Time Features: Chat, Video Streaming, Push Notifications, Maps & Geolocation ✅ Clean UI/UX Implementation from Figma or Adobe XD ✅ Ongoing Maintenance, Refactoring, and Feature Expansion 🔧 Tech Stack & Tools Frameworks & Languages: React Native • Expo • TypeScript • JavaScript • Redux • Zustand • Next.js Back-End & API: Node.js • Express • Firebase (Auth, Firestore, Cloud Functions) • Supabase • REST • GraphQL DevOps & Testing: Git • GitHub Actions • Fastlane • Crashlytics • Sentry • Jest • Detox Databases: PostgreSQL • MongoDB • MySQL Design: Figma • Adobe XD • Tailwind CSS • Styled Components 📲 Types of Apps I Specialize In • E-commerce & Marketplace Apps • Booking & Appointment Systems • Fintech & Wallet Integrations • Health & Fitness Tracking • Education & EdTech Platforms • Real Estate Listings & PropTech • Social & Community Apps (Chat, Video, Notifications) • MVPs for Startups & SaaS Platforms 🤝 Why Clients Choose Me ✅ On-Time Delivery, Every Time ✅ Smooth Communication (Clear, Prompt, Transparent) ✅ Hands-On Guidance from Idea to Launch ✅ Focused on ROI-Driven Features ✅ 100% Client Satisfaction with Ongoing Support ✅ Strong Collaboration with Designers, PMs, and Backend Teams ✅ Ability to Scale Projects and Lead Other Developers if Needed 💬 Let's Talk – Free Initial Consultation! Have an app idea or need help scaling your current mobile solution? I offer a free consultation to discuss your goals, technical needs, and timelines. Let’s turn your concept into a high-quality product your users will love. Click “Invite to Job” or “Message” — I usually respond within 1–2 hours. React Native Developer | Cross-Platform Apps | Mobile App Development | TypeScript Expert | Firebase | Expo | Android & iOS | MVP App Developer | UI/UX | Performance Optimization | API Integration | Top React Native Freelancer