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🚀 Staff iOS Engineer (10+ yrs) — Real-time Video/VoIP & AI Integration I build and fix iOS/macOS apps fast—clean, stable, and ready to ship. Previously at Fanatics (Live & Collect), Agora (macOS Tech Lead), and RingCentral (Staff Engineer). I specialize in two high-value areas: real-time audio/video systems and production AI integration. ✅ Selected impact • Reduced crash rate 10x through systematic stability work (crash/ANR triage, threading, memory) • Improved user NPS +40% via closed-loop quality optimization • Evolved a live platform from viewer-only → full broadcaster (streaming + interactions) • Built ANR monitoring (main-thread blocking detection) → 3x faster issue resolution • Experience shipping for massive-scale consumer products (e.g., bilibili-level traffic) 🎥 Real-time audio/video & streaming (production) • Live streaming & video conferencing: LiveKit / Agora SDK / Amazon IVS • AVFoundation capture/render pipelines, recording/upload, performance tuning • CallKit + PushKit VoIP calling (background, reconnect, audio routes, reliability) • Real-time interactions: auctions, voting, chat (WebSocket / GraphQL Subscriptions) • Screen sharing: iOS App Extension + macOS plugins • Socket/IM architecture experience; solid networking fundamentals (TCP/UDP) 🤖 AI integration • OpenAI / Claude API integration for user-facing features • HealthKit + Apple Watch data pipelines (sleep/HR/activity/workouts) • Prompt & context management, on-device + cloud orchestration for personalized insights 🏗️ Architecture & engineering • Clean Architecture / SOLID, protocol-oriented DI, modular design • TCA & MVVM (migration and coexistence), Swift Concurrency (async/await, Actors) • Swift + Objective-C, pragmatic refactors, long-term maintainability 🧪 Quality & delivery • Tests: XCTest/XCUITest, snapshot tests; TDD when valuable (Quick/Nimble) • CI/CD: Fastlane, Jenkins/GitHub Actions/Xcode Cloud, TestFlight/App Store release • Logging/analytics (e.g., Firebase/Crashlytics) to locate root causes quickly 🛠️ How I work • Start with a short paid assessment → confirm scope, estimate, and risks • Milestones with demos + clear acceptance criteria • Strong communication, pragmatic testing, and maintainable Swift • Available 40 hrs/week, fluent in English, timezone-friendly and responsive 💻 Equipment: Mac Studio (M1 Max, 32GB), dual 28” 4K monitors, 1Gbps fiber. If you’re building live video/VoIP features, integrating AI into an app, or need to stabilize and scale an existing codebase, feel free to message me—happy to review your scope and propose a plan.

● From Concept to Market: Integrated Engineering via the GBA Supply Chain. I am a full-stack engineer and founder of DigiMech Studio, an independent one-man R&D consultancy based in the Greater Bay Area. With over two decades of experience leading hardware projects from PoC to mass production, I offer a unified solution for Mechanical, Electrical, and Firmware development. My studio acts as your local technical partner in China, providing the precision of an experienced R&D Lead while maintaining the agility and cost-effectiveness of a solo expert. ● Why Work With Me? 🛠️ One-Stop Decision Maker (EE/ME/FW): 20+ years of expertise rooted in my degree in Mechanical Manufacturing and Equipment Automation. I solve problems that involve hardware, casing, and code simultaneously. I make instant technical decisions on the factory floor to keep your project moving without delays. 🚀 Supply Chain & Chip Strategy (Ex-Distributor): With a background in top IC distributors(ZLGMCU), I don't just buy parts; I optimize your BOM. I specialize in chip substitution (NXP/TI/ST) to solve shortages and cut costs. I also have mature channels for sourcing X86/ARM motherboards and industrial peripherals. 🏭 Tooling & Manufacturing Oversight: I bridge the gap between design and mass production. I personally oversee injection mold opening and modifications, ensuring your mechanical parts are DFM-compliant and avoiding costly re-tooling cycles. 📡 Industrial IoT & Control Expert: Deep technical expertise in high-reliability industrial communication protocols, including CAN, RS485, Zigbee, NB-IoT, and LoRa. I design robust systems for smart grids and industrial automation. ⚡ From Prototype to Mass Production: Leveraging my local network, I deliver functional PCBA prototypes in 4 days and CNC/3D parts in 3 days. Beyond speed, I specialize in scaling to mass production (MP), providing on-site DFM support, factory auditing, and production line optimization to ensure high yield and quality. ● My "Full-Stack" Core Competencies: ⚡ Hardware Engineering (EE): Expert in Schematic & High-Speed PCB Layout (Altium Designer / Cadence OrCAD), Analog/Digital Circuit Design, and BOM Cost Optimization. ⚙️ Mechanical Design (ME): Proficient in ProE/Creo for Plastic Injection Molding & Sheet Metal Enclosures. Strong focus on DFM (Design for Manufacturing) to ensure smooth tooling processes. 💻 Embedded Firmware (FW): Deep expertise in C/C++ (Keil MDK/IAR) for ARM Cortex-M (STM32/NXP). Experienced in Industrial Protocols (CAN/RS485/Modbus). 🛠️ Production Automation & Tools: Development of custom PC-based GUI Testing Tools using VC++ / Python. I build automated solutions for Factory Acceptance Testing (FAT) to ensure mass production quality. 🚀 Product Performance & Reliability Optimization -RF Optimization: Antenna Matching(wifi/Lora/BT), Link Budget Analysis, Range Extension. -Signal Integrity: EMI/EMC Filtering, Differential Pair Routing, Noise Suppression. -Reliability Engineering: Component Derating, Thermal Management. ● My Workspace: I run a private R&D studio where I spend 12+ hours a day. It is not just an office; it is a workshop designed for rapid prototyping and deep technical analysis. This allows me to handle physical samples and manage logistics directly from my desk. ● My Commitment: I am a "Tech Geek" obsessed with solving hard problems, Note: I specialize in technical reading and writing. To avoid any potential language barriers in verbal communication and to ensure 100% accuracy in engineering specs, I communicate exclusively through text. This ensures every detail is correctly understood and executed. ⚡⚡ From Concept to Market: Whether you need New Product Development (NPI) from scratch, a quick prototype, a cost-down analysis, or a factory liaison, I bring the "China Speed" to your project. I bridge the gap between your idea and a shelf-ready product, ensuring every stage is optimized for performance and profit.

I have over 15 years of software development experience, specializing in audio and video processing and media streaming development. 🎯 Services I Offer • FFmpeg & GStreamer Development & Integration • Video Editing & Post Effects (Overlays, Watermarks, Transitions) • Cross-Platform Media Player Development (Windows, macOS, iOS, Android) • Live / VOD & Adaptive Streaming (HLS, DASH, ABR) • WebRTC Development (Real-time Communication) • Video Processing Performance Optimization & Hardware Acceleration • Audio/Video Codec Development & Optimization • Troubleshooting (C/C++) • Cross-Platform Client App Development (Qt / VC++ / Windows / macOS / Mobile) • Full-Stack Media System Development 💻 My technical stack includes: ✔ Open-Source Projects: FFmpeg, GStreamer, OBS Studio, ExoPlayer, IJKPlayer, WebRTC, SRS ✔ Programming Languages and Frameworks: C/C++ (11, 14, 17, 20) , Python, NodeJS, Objective-C, Java, JavaScript, Qt 4.x – 6.x, WinAPI, MFC ✔ Streaming Protocols: HLS, FLV, DASH, RTMP, RTP ✔ Codecs and Container Formats: H.264, H.265, AAC, MP3, AV1, MP4, MKV, MPEG-TS ✔ Hardware Acceleration and Rendering Technologies: MediaCodec, VideoToolbox, Metal, OpenGL, OpenGL ES, Direct3D, Vulkan ✔ Networking Technologies: HTTP, TCP, UDP, QUIC, Cronet, CURL ✔ Operating Systems: Windows, macOS, iOS, Android ✔ IDEs: Visual Studio, Visual Studio Code, Xcode, Android Studio, Qt Creator ✔ Version Control Systems: Git, SVN, Mercurial I have worked at major technology companies such as Alibaba, gaining extensive project experience. I pay great attention to detail, am proactive in learning and problem-solving, and can quickly adapt to different project requirements. Feel free to contact me anytime!

I am a Senior Full Stack Developer dedicated to engineering high-impact web and desktop applications. With a robust technical foundation, I specialize in building scalable architectures and sophisticated multimedia solutions. My expertise lies in bridging the gap between complex backend logic and seamless user experiences. I have extensive experience in FFmpeg-based video/audio processing, real-time audio visualization, and developing custom social media integrations. I am passionate about transforming intricate business requirements into clean, maintainable, and high-performance code. Core Technical Stack: Backend: Node.js, Python (Specializing in RESTful APIs & Scalable Microservices) Frontend: Vue.js, React, HTML5, CSS3 (Modern, Responsive & High-performance UI) Multimedia: FFmpeg (Advanced Transcoding & Processing), Web Audio API (Voice Features & Visualizations) Desktop: Electron (Cross-platform Desktop Application Development) Integrations: Social Media APIs, OAuth, and Third-party Data Services What I Bring to Your Project: Multimedia Excellence: Expert handling of media workflows and audio-visual data. Full-Stack Vision: A holistic approach to architecture, ensuring performance and security from database to UI. Business Alignment: A deep focus on delivering tools that drive real-world results and user engagement. Whether you need a high-performance multimedia tool, a custom desktop application, or a scalable social platform, I am ready to help you turn your vision into reality. Let’s connect!

Results-driven Full Stack Developer with 12 years of specialized expertise in interactive 360° media development, particularly in creating captivating panoramic tours and seamless video streaming solutions. As a top-level expert in KRpano, I excel in end-to-end customization of immersive experiences, demonstrating exceptional proficiency in developing plugins and tailoring functionalities to meet precise project requirements. My skill set includes modern web technologies such as React, TypeScript, Next.js, Node.js, and Tailwind CSS, along with substantial experience in WebGL through React-three-fiber for advanced 3D web applications. Additionally, I am well-versed in essential tools like Git, Vercel, and FFmpeg, and possess strong non-development skills, including image processing, video editing, and panorama stitching, ensuring the delivery of polished and innovative multimedia solutions.