WebRTC mobile apps, iOS, OTT, Smart TV, AR/VR – senior iOS, Android, and Smart TV developer. $600K+ earned across 14,700+ hours, 100% JSS, Top Rated Plus. 15 years building real-time video and AI mobile apps. I lead mobile on funded products. ⚡ 𝗙𝗿𝗲𝗲 𝗣𝗥𝗗. 𝗠𝗩𝗣 𝗶𝗻 𝟳-𝟭𝟰 𝗱𝗮𝘆𝘀. 𝗙𝗿𝗲𝗲 𝗰𝗼𝗱𝗲 𝗿𝗲𝘃𝗶𝗲𝘄 𝗼𝗿 𝗮 𝟮-𝘄𝗲𝗲𝗸 𝘁𝗿𝗶𝗮𝗹 𝗼𝗻 𝗮𝗻 𝗲𝘅𝗶𝘀𝘁𝗶𝗻𝗴 𝗰𝗼𝗱𝗲𝗯𝗮𝘀𝗲. ⚠️ Invite me to your job – I reply within 15 minutes. 𝗔𝗽𝗽𝘀 𝗜'𝘃𝗲 𝗦𝗵𝗶𝗽𝗽𝗲𝗱 → Meetric - AI sales video platform, $2.25M seed. Led 3,837 hours across iOS, WebRTC, Twilio, Node.js. Real-time speech analysis during calls and AI post-meeting reports. Automates 80–100% of CRM data entry. White-labeled by telecom and CRM partners in Europe. → Sprii - live shopping for 3,000+ European brands. iOS and Android. 72K+ live events, 21M products sold, €365M+ in sales. 20× higher conversion for sellers. → Nucleus - real-time UCaaS for 300K+ customers. Native iOS and Android with WebRTC and SIP calling. 600M+ AI call minutes a month. SOC II, GDPR, HIPAA. → TransLinguist - AI interpretation app for the UK NHS. Voice-to-voice translation in 16+ languages, captions in 22. Won the NHS national framework tender. 30,000+ certified interpreters. 𝗪𝗵𝗲𝗿𝗲 𝗜'𝗺 𝗦𝘁𝗿𝗼𝗻𝗴𝗲𝘀𝘁 → WebRTC mobile apps - real-time video and voice calling, conferencing, and low-latency streaming on iOS and Android → Smart TV and OTT/IPTV - VOD and IPTV apps for Apple TV, Samsung Tizen, and LG WebOS. DRM, EPG, low-latency tune-in → AR, VR, and spatial computing - real-time face and object overlays, AR Quick Look, visionOS, and Vision Pro → AI on mobile, on-device and cloud - object detection, face and emotion recognition, speech-to-text → AI language interpretation - voice-to-voice translation, live multilingual captions, interpreter routing → Live commerce - in-app live shopping, product overlays, in-stream checkout, output to Facebook and Instagram → Enterprise UCaaS - secure WebRTC video and voice, AI phone agents, CRM and ERP-integrated dial plans 𝗦𝗽𝗲𝗰-𝗙𝗶𝗿𝘀𝘁 𝗔𝗴𝗲𝗻𝘁𝗶𝗰 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 I work spec-first, not vibe-first. Spec and architecture come before any code. Then I drive AI agents against strict guardrails to produce production-grade output. The hard real-time work I handle or verify myself: WebRTC pipelines, sub-second video latency, and on-device ML. You get AI speed with senior-engineer stability. 𝗛𝗼𝘄 𝗜 𝗗𝗲𝗹𝗶𝘃𝗲𝗿 30-min discovery → spec, architecture, and a ±10% estimate → AI dev environment with guardrails → MVP with CI/CD and a 2-week demo cadence. App Store and Play Store submission included. 𝗛𝗼𝘄 𝗬𝗼𝘂 𝗖𝗮𝗻 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲 → New app from scratch - iOS, Android, Smart TV, or cross-platform → Senior lead on hard modules - video, AI, WebRTC, streaming → Rescue and modernize - fix unstable apps, refactor messy codebases, ship to production 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗜 𝗨𝘀𝗲 𝗗𝗮𝗶𝗹𝘆 → Mobile: Swift, SwiftUI, UIKit, React Native, Flutter, Combine, Alamofire, Kotlin, Jetpack Compose → Video and streaming: AVFoundation, ReplayKit, ExoPlayer, ARKit, SceneKit, Metal, CameraX, WebRTC, FFmpeg, Wowza, LiveKit, HLS/DASH, RTMP, DRM → AI and ML: Core ML, TensorFlow Lite, PyTorch, YOLOv8, CLIP, OpenCV, OpenAI API, Whisper, Deepgram → Backend and infra: Node.js, NestJS, Python (FastAPI), Go, PostgreSQL, MongoDB, Redis, AWS, GCP, Docker, Kubernetes → Payments and auth: Stripe, RevenueCat, PayPal, Firebase, OTP authentication → Quality and security: TestFlight, Crashlytics, Sentry, AES-256, GDPR, HIPAA 𝗪𝗵𝘆 𝗙𝗼𝗿𝗮 𝗦𝗼𝗳𝘁 The team behind me: 100% JSS · 914 jobs · $10M+ earned · 401K+ hours · 625+ projects since 2005 · 400+ clients across 17+ countries · Top WebRTC Developer 2022 and Top Telecom Developer 2024 · 1 of 400 devs passes our internal selection. 𝗖𝗹𝗶𝗲𝗻𝘁 𝗙𝗲𝗲𝗱𝗯𝗮𝗰𝗸 "We've been working together for 10 years and continue. Fora Soft planned and built our entire Wowza-based video surveillance SaaS from scratch across web, iOS and Android." — Dustin, CTO @ VALT (50,000 users, 770 orgs, 2,500 IP cameras) ⚠️ Press Invite or message me - I'll send back a PRD, architecture, and an estimate.

During my 25 years career I had the possibility to define, develop and manage several IT proyects for different companies in different countries (Argentina, USA, Ireland ,Mexico, Uruguay, Chile ). I also gain expertise in many different sectors and industries (Advisory , finance, health care , wholesale/retail, marketing, insurance, pharmaceutical). I am a pro-active professional and highly involved person, caring for projects and organization objectives.

My name is Alejandro Martin. I am Systems Enginering. I have more than 7 years of experience developing in .net c# and three years leading teams in new projects. I have experience using winform, webform, wpf, .net mvc, webapi, swagger, azure, sql server, mysql, javascript, jquery, vuejs, angular, react and git

I'm an Upwork member with 100% Job Success and Top Rated Plus Python and C++ programmer with extensive experience in sound, image and video processing. I have been working for a long time with the OpenCV, GStreamer and NVIDIA Deepstream SDK libraries, using GPU hardware with CUDA and other HPC libraries. My work experience includes professional video players & editors, transcoders (using different types of inputs, such Blackmagic Decklink capture cards and all the video formats: HLS, SRT, fMP4, WebRTC), DSP systems, JUCE framework, object detection and tracking, Deep Learning systems (YOLO, Pytorch, Tensorflow, TensorRT), AI hardware like NVIDIA Jetson Orin and Raspberry Pi devices. I have also experience in ultrasound signal processing. In ML and LLM models I'm working training Reinforcing Learning PPO models and LORA fine tuning methods on AI. Also I have experience with TTS and Speech Recognition systems using models like Whisper, WhisperX and PiperTTS. In Hardware and PCB design I have good experience in Arduino and IDF Espressif systems, based on ESP32, ESP32s2 and ESP32s3 chips with standard thermal cameras and ESP32 Drones, using MQTT messaging and SSL certificates (WiFi, Bluetooth and external sensors). I can design and build a custom PCB board. I like to choose projects that interest me and that match my skills and give me a challenge or bring something new.

I am a passionate developer with specialized experience in technologies such as React, NextJs, React Native, Redux, Zustand, and Context. My dedication revolves around creating seamless and efficient digital experiences. Throughout my professional journey, I have gained solid expertise in server-side development using Node.js and Express.js. My experience extends to various databases, including MongoDB, Firebase, MySQL, and SQLite, enabling me to approach projects with versatility and effectiveness. In addition to my technical skills, I have a proactive approach to problem-solving and performance optimization. My goal is to contribute to project success by developing innovative and scalable solutions. I am always eager to learn and grow in the world of software development, and I am open to new opportunities and challenges. Connect with me to explore potential collaborations and share insights in the exciting realm of technology!

I build computer vision, mobile AI, and LLM agent systems that run in production — not proof-of-concepts. $600K+ earned · 100% Job Success · Top Rated Plus · 50+ apps shipped · 10+ years.   🎥 Computer Vision & Video AI Real-time detection, tracking, and video pipelines built for live production. - Built real-time tracking for a US sports company — processing live camera feeds frame-accurate for automated broadcast. - Image registration & feature matching (homography, SIFT/ORB) for frame alignment and multi-frame processing. - Edge & on-device optimization: quantization, ONNX / TFLite / CoreML export, low-latency real-time inference. Stack: YOLO, OpenCV, C++ inference, homography, SIFT/ORB, FFmpeg, ONNX, CoreML, TensorFlow Lite.   📱 Mobile AI — iOS & Android Where mobile meets ML: I ship AI that runs on the device, not just calls to a server. - On-device inference with CoreML & TensorFlow Lite — quantized, optimized models running in real time, offline, no backend round-trip. - Real-time computer vision on phones — live camera detection & tracking running directly on iOS/Android hardware. - AI embedded in the core product flow — vision and ML features, not a bolted-on toggle. - 50+ apps shipped over 10+ years across healthcare, fintech, wellness, and sports. Swift, SwiftUI, Kotlin, Jetpack Compose, Flutter, React Native.   📊 Data & ML Pipelines - Built a PySpark clustering pipeline for a US energy AI company — segmented ~1M households into 50–200 cohorts, production-grade with a validation framework. 🛠 Stack Vision: YOLO, OpenCV, C++ inference, homography, FFmpeg, CoreML, TensorFlow Lite Mobile: Swift, SwiftUI, Kotlin, Jetpack Compose, Flutter, React Native AI/LLM: Claude, GPT, Gemini, LangChain, LangGraph, RAG, vector DBs, n8n ML/Data: Python, PyTorch, TensorFlow, PySpark, Pandas, scikit-learn Cloud: AWS Bedrock, Azure OpenAI, Vertex AI, Firebase 🌎 Based in Buenos Aires (GMT-3) — solid overlap with US & EU business hours. English: Fluent. Weekly updates, clear timelines, honest scoping — if something needs to change mid-project, you hear it early, with options. Send me the problem — I'll tell you how I'd approach it and how long it'll take. Message me to start

Serfe is an ISO 9001:2015 certified company that provides consulting and development services in information technology oriented to Internet. We specialize in the development of (1) websites with Wordpress, (2) E-Commerce stores with Magento, WooCommerce and PrestaShop, (3) develop and maintain large online systems using the latest available technologies (ie: React Native, Angular, NodeJS, PHP, Laravel, Ruby, Python, MySQL, PostgreSQL). Since 2003, we have served as a web and mobile development team to hundreds of companies all over the world, being repeatedly recognized for developing innovative solutions. We are responsible for full lifecycle development of next-generation software, from initial requirement gathering to design, coding, testing, documentation and implementation, merging business and user needs into high-quality, cost-effective solutions while keeping within budgetary constraints. We also known the importance of an effective communication. As we are in Argentina, we have a similar timezone with America and Western Europe, allowing us to take advantages of phone calls and video-conferences to be sure that we are always on the same page on every step we take. Please, contact us if you have any questions, we would be glad to help you.

To deliver quality software and value to our customers. At your services.

Looking to build stable, production-ready AI applications backed by high-performance architecture? I am a Senior .NET Developer and AI Engineer with over a decade of hands-on experience designing robust backend architectures for high-transaction industries like Banking and Crypto Exchanges. I specialize in building the secure infrastructure required to run reliable AI applications—focusing on advanced Retrieval-Augmented Generation (RAG) pipelines, LLM integration, and multi-agent systems. By leveraging C# .NET Core and Docker-distributed environments, I ensure your AI initiatives move seamlessly past the prototyping phase and scale safely in production. 🛠️ CORE AI & BACKEND CAPABILITIES: • AI Orchestration & RAG: Architecting advanced Retrieval-Augmented Generation (RAG) pipelines, semantic data strategies, and multi-agent systems using modern LLM frameworks. • Enterprise .NET Architecture: Designing secure, high-throughput C# .NET Core microservices, WebAPIs, and robust transaction layers. • Database & Query Optimization: Advanced T-SQL data modeling and performance tuning to handle complex underlying datasets efficiently. • Containerization & Deployment: Building and isolating AI workloads across robust Docker-distributed infrastructure environments. 💼 INDUSTRY-GRADE RELIABILITY: • FinTech & Banking Foundations: A proven track record of engineering multi-tenant banking products and crypto-fiat exchange platforms under strict delivery standards. • Production-First Mindset: Your proprietary business data remains secure, token usage stays optimized, and your AI systems are built to scale rather than break. Let’s move your AI project beyond a simple template and into a resilient production system. Click "Invite to Job" to discuss your project!

I build production-grade AI systems: LLM applications, RAG pipelines, AI agents, enterprise knowledge graph and expert systems, and the backend infrastructure required to make them reliable. I’m a senior software engineer with 20 years of professional experience across full-stack development, distributed systems, real-time applications, cloud infrastructure, and complex integrations. Over the last several years, my work has focused on LLM infrastructure, LangChain/LangGraph, OpenAI APIs, semantic systems, RDF/JSON-LD, Neo4j, vector search, and production AI workflows. My strength is not just building AI demos. It is turning ambiguous product ideas into maintainable, scalable systems with clear architecture, reliable data flow, strong backend foundations, and production-ready implementation. Recent work includes: architecting AI orchestration systems with LangGraph, building RAG pipelines with structured retrieval and tool execution, designing graph-based knowledge systems using RDF, JSON-LD, and Neo4j, creating scalable event-driven backends on AWS, developing real-time AI-powered applications, integrating complex third-party APIs and data sources, improving reliability, performance, and maintainability of existing systems. Clients typically bring me in when they need: AI agents and autonomous workflows, Retrieval-Augmented Generation, LangChain/LangGraph architecture, LLM orchestration and tool execution, knowledge graphs and semantic data models, graph and vector-based retrieval systems, AI workflow automation, scalable Node.js/TypeScript backends, real-time and event-driven systems, AWS serverless and cloud-native infrastructure, technical leadership on complex or ambiguous projects. I have worked exclusively as a full-time freelancer for more than 10 years. I’m used to taking ownership, communicating clearly, adapting quickly to existing teams, and delivering reliable systems without heavy supervision. Best fit: complex AI/backend projects where architecture, reliability, and long-term maintainability matter more than quick demos. ⸻ Core Expertise AI & LLM Systems: LangChain, LangGraph, LangSmith, OpenAI APIs, AI agents, tool orchestration, RAG pipelines, vector search, structured outputs, prompt engineering, streaming LLM applications, AI workflow automation. Knowledge Graphs & Semantic Systems: RDF, JSON-LD, Neo4j, graph databases, semantic data modeling, knowledge graph architecture, graph and vector retrieval, entity modeling, data integration. Backend & Infrastructure: Node.js, TypeScript, Python, NestJS, Express, Koa, GraphQL, REST APIs, WebSockets, PostgreSQL, Redis, DynamoDB, Elasticsearch, RabbitMQ, AWS, Docker, Kubernetes, Terraform. Frontend: React, Next.js, Redux, Apollo GraphQL, Relay, Storybook, real-time collaborative interfaces. ⸻ Technology Stack TypeScript, JavaScript, Python, Node.js, React, Next.js, NestJS, Express, GraphQL, REST, WebSockets, PostgreSQL, MongoDB, Redis, DynamoDB, Elasticsearch, RabbitMQ, AWS Lambda, API Gateway, S3, IAM, CloudFormation, Docker, Kubernetes, Helm, Terraform, LangChain, LangGraph, LangSmith, OpenAI APIs, RDF, JSON-LD, Neo4j, vector search, Jest, Cypress, Selenium, Puppeteer.