<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://yaksheng.com</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>1.0</priority>
    <description>Richard Lee is a Product Engineer and 0-to-1 product builder based in Singapore specializing in hardware/software integration, AI/ML systems, and full-stack development. Portfolio showcasing projects, skills, and professional experience.</description>
  </url>

  <!-- Professional Identity -->
  <url>
    <loc>https://yaksheng.com/richard-lee</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.95</priority>
    <description>Richard Lee is a Singapore-based Product Engineer and 0-to-1 product builder with expertise spanning embedded systems, PCB architecture, AI/ML systems, and full-stack development. Former founder of Peasy Labs and Senior Engineer at TeleMedC.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/singapore-engineer</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>Singapore-based Product Engineer specializing in hardware/software integration, AI/ML systems, and full-stack development. Expert in PCB design, embedded systems, and building innovative solutions from concept to market.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/ai-engineer</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>AI Engineer and Orchestrator with expertise in building complex AI agent systems, model routing strategies, digital twins, and embodied AI implementations. Proficient with OpenAI Models, Vercel AI Gateway, and custom AI routing architectures.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/hardware-engineer</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>Hardware Engineer specializing in PCB design, embedded systems, sensor integration, and firmware development. Experience with Arduino platforms and custom hardware solutions for medical devices, wearables, and IoT applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/embedded-engineer</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>Embedded Systems Engineer with expertise in firmware programming, real-time operating systems, and hardware integration. Proficient in developing reliable, high-performance embedded solutions for a wide range of applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/south-korea-exchange</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Semester Exchange at Pohang University of Science and Technology (POSTECH), South Korea. Studied Computer Engineering with focus on advanced computing and international academic collaboration in engineering disciplines.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/product-engineer-singapore</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>Singapore Product Engineer specializing in bridging complex hardware and robust, scalable software. Expert in embedded systems, PCB design, AI/ML orchestration, and full-stack development using React, Next.js, and Node.js.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/hardware-software-integration</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>Hardware/software integration specialist with deep expertise in PCB architecture, embedded systems, sensor integration (IMUs, Time-of-Flight), and firmware development. Experience with Arduino and custom hardware solutions.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/ai-orchestrator</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>AI Orchestrator skilled in building complex AI agent systems, model routing strategies, digital twins, and embodied AI implementations. Proficient with OpenAI Models, Vercel AI Gateway, and custom AI routing architectures.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/systems-architect</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>Staff-level Systems Architect experienced in designing complex, scalable systems from concept to market. Specializes in R&amp;D, product development, rapid prototyping, and leading mission-critical projects across hardware and software domains.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/zero-to-one-product-builder</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
    <description>0-to-1 product builder and founder of Peasy Labs, an independent venture lab focused on hardware prototyping, SaaS, and e-commerce products. Experienced in market validation, supplier negotiations, and regulatory compliance.</description>
  </url>

  <!-- Professional Experience -->
  <url>
    <loc>https://yaksheng.com/telemedc-senior-engineer</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Senior Engineer at TeleMedC (Sep 2024 - Nov 2025) leading end-to-end development of next-generation medical devices. Responsibilities include PCB architecture, embedded systems integration, and AI-driven DevOps workflows.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/peasy-labs-founder</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Founder of Peasy Labs (Jan 2020 - Aug 2024), an independent venture lab operating in hardware prototyping, SaaS, and e-commerce. Built multiple products from concept to market, specializing in rapid iteration and market validation.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/shopee-product-manager</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Product Manager at Shopee focusing on data platforms, localization strategies, and payment integrations. Led product initiatives that improved user experience and operational efficiency across Southeast Asia's leading e-commerce platform.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/rakuten-viki-product-manager</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Product Manager at Rakuten Viki specializing in localization and international content distribution. Developed strategies to expand streaming services across multiple markets while maintaining content quality and viewer engagement.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/singapore-armed-forces-trainer</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
    <description>Specialist Trainer at Singapore Armed Forces leading technical training for over 1,000 reservists. Developed and delivered comprehensive training programs covering technical skills, leadership development, and operational procedures.</description>
  </url>

  <!-- Core Competencies -->
  <url>
    <loc>https://yaksheng.com/pcb-design</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>PCB design expertise including schematic capture, component selection, board layout, and manufacturing oversight. Experience designing embedded systems for medical devices, wearables, and IoT applications with focus on reliability and regulatory compliance.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/embedded-systems</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Embedded systems development including firmware programming, real-time operating systems, sensor integration, and low-power optimization. Proficient with Arduino platforms and custom embedded solutions for hardware products.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/ai-agent-orchestration</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>AI agent orchestration expertise building multi-agent systems with intelligent routing, task delegation, and context management. Developed frameworks for coordinating AI workflows across different models and use cases.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/full-stack-development</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Full-stack development using React, Next.js, TypeScript, Node.js, and serverless architectures. Built scalable web applications with Neon Postgres, MongoDB, and Prisma ORM for data persistence and management.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/serverless-architecture</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Serverless architecture design using Vercel Functions, AWS Lambda, and cloud-native services. Built cost-optimized, scalable applications with automatic scaling, built-in availability, and reduced operational overhead.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/product-strategy</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Product strategy expertise including market validation, competitive analysis, supplier negotiations in Mandarin, and regulatory compliance navigation. Led products from initial concept through market launch and iteration.</description>
  </url>

  <!-- Technical Skills -->
  <url>
    <loc>https://yaksheng.com/react-nextjs</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Frontend development with React and Next.js using modern tooling including Tailwind CSS, Radix UI, and Zustand for state management. Built responsive, performant web applications with excellent developer experience and user interfaces.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/python-typescript</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Programming proficiency in Python and TypeScript for backend services, AI/ML pipelines, data processing, and full-stack applications. Experienced in building type-safe, maintainable codebases with comprehensive testing coverage.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/nodejs-backend</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Backend development with Node.js and Express creating RESTful APIs, webhook integrations, and real-time services. Built scalable server-side applications with Telegraf.js for Telegram bot development and third-party API integrations.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/telegram-bot-development</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Telegram bot development using Telegram Bot API, webhooks, and serverless deployment. Built AI-powered companion bots with three-layer memory systems, multimodal input support, and cost-optimized model selection strategies.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/cloud-data-processing</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Cloud-based data processing pipeline development with error resilience, cost optimization, and monitoring. Built ETL pipelines handling large-scale data transformation and integration across multiple sources and destinations.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/database-design</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Database design and implementation using Neon Postgres, MongoDB, and Prisma ORM. Built scalable, performant database schemas with proper indexing, query optimization, and data modeling for complex applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/aws-lambda</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>AWS Lambda expertise in building serverless functions for scalable, cost-optimized applications. Experience with event-driven architectures, automatic scaling, and integration with other AWS services for end-to-end serverless solutions.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/vercel</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Vercel platform specialist for deploying and scaling Next.js applications, serverless functions, and AI-powered services. Proficient with Vercel AI Gateway and optimized deployment workflows for maximum performance and minimal latency.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/ros-robot-operating-system</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>ROS (Robot Operating System) expertise for building autonomous robotic systems, sensor integration, and navigation algorithms. Experience with differential drive kinematics and real-time obstacle avoidance in embodied AI applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/computer-vision</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Computer vision expertise including object detection, image processing, and integration with AI models for real-time applications. Applied in autonomous robotics, embodied AI systems, and hardware platforms for enhanced environmental awareness.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/3d-printing</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>3D printing proficiency for rapid prototyping, custom enclosures, and manufacturable designs. Experience with creating complete hardware solutions including PCB integration, 3D printed housings, and end-to-end product development.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/firmware-development</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Firmware development expertise for embedded systems, microcontrollers, and IoT devices. Proficient in low-level programming, real-time operating systems, and integration with hardware components for reliable, high-performance devices.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/tailwind-css</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Tailwind CSS specialist for building modern, responsive user interfaces with utility-first styling. Experience with component design systems, responsive layouts, and optimized styling for performance and accessibility across devices.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/radix-ui</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Radix UI expert for building accessible, composable UI components. Proficient in using unstyled components to create custom design systems with consistent behavior, accessibility features, and optimal performance for web applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/zustand</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Zustand state management specialist for React applications. Experienced in building lightweight, scalable state solutions with minimal boilerplate, enabling efficient state sharing and management across complex application architectures.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/prisma-orm</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Prisma ORM expert for database access and management. Proficient in schema design, type-safe queries, and database migrations across multiple database systems including PostgreSQL, MongoDB, and Neon Postgres for web applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/neon-postgres</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Neon Postgres specialist for serverless, scalable database solutions. Experience with branchable, globally distributed databases that enable efficient development workflows, automatic scaling, and high availability for web applications.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/mongodb</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>MongoDB expert for document database design and implementation. Proficient in flexible schema design, query optimization, and scaling NoSQL databases for applications requiring high throughput, flexible data models, and horizontal scalability.</description>
  </url>

  <!-- Hackathon Projects -->
  <url>
    <loc>https://yaksheng.com/protoai-hardware-platform</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>ProtoAI (Cursor x Anthropic Malaysia Hackathon): AI-powered platform generating manufacturable hardware designs. Open-sourced wearable air quality pendant with complete PCB, 3D printed enclosure, and firmware. Recognised by CNBC and DeepMind for innovative hardware-to-software implementation.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/digital-twin-ai-assistant</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
    <description>Digital Twin AI Assistant: Context-aware AI with unified memory, intelligent chunking and querying via high-context models. Serverless deployment on Vercel integrated with Telegram for seamless conversational experiences across platforms.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/travel-insurance-agent</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Travel Insurance Assistant: AI-powered personal insurance purchasing and claims analytics platform. Features intelligent agent orchestration for policy comparison, claims processing, and personalized recommendations based on travel patterns.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/embodied-ai-rover</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Embodied AI Rover: Autonomous navigation system featuring computer vision, sensor fusion, and differential drive kinematics. Demonstrated real-time obstacle avoidance and path planning capabilities with ROS integration.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/gamified-personal-coach</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Gamified Personal Coach: Progressive Web App featuring interactive 3D avatars, gamification mechanics, and personalized maps. Includes cross-device synchronization, progress tracking, and engaging user experience design.</description>
  </url>

  <!-- Personal Projects -->
  <url>
    <loc>https://yaksheng.com/etl-data-pipeline</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Cloud-based ETL Data Pipeline: Production-ready data processing system with robust error handling, cost optimization strategies, and comprehensive monitoring. Handles data transformation, validation, and delivery across multiple destinations.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/telegram-ai-companion-bot</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Serverless Telegram AI Companion Bot: Features three-layer memory system (short-term, long-term, semantic), multimodal input support (text, images, voice), and intelligent model routing for cost-optimized responses across different query types.</description>
  </url>

  <!-- Education -->
  <url>
    <loc>https://yaksheng.com/sutd-computer-engineering</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
    <description>Bachelor of Engineering in Computer Engineering from Singapore University of Technology and Design (2015-2020). Coursework covered embedded systems, software engineering, digital logic, and computer architecture with hands-on project experience.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/postech-exchange</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
    <description>Semester Exchange at Pohang University of Science and Technology (POSTECH), South Korea (2017). Studied Computer Engineering with focus on advanced computing and international academic collaboration in engineering disciplines.</description>
  </url>

  <!-- Awards -->
  <url>
    <loc>https://yaksheng.com/best-soldier-award</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.65</priority>
    <description>Best Soldier Award recipient from Singapore Armed Forces recognizing exceptional performance, leadership, and dedication to duty during national service. Demonstrated excellence in technical training and team coordination.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/non-mihi-solum-award</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.65</priority>
    <description>Non Mihi Solum Award recipient for service beyond self, recognizing contributions to community and organization during Singapore Armed Forces service. Awarded for leadership, mentorship, and organizational impact.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/robot-performance-award</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.65</priority>
    <description>Best Robot Performance Award (Third Placing) from robotics competition demonstrating expertise in hardware design, sensor integration, and autonomous navigation systems. Showcased innovative solutions in robotic system implementation.</description>
  </url>

  <!-- Skills Summary -->
  <url>
    <loc>https://yaksheng.com/skills</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
    <description>Comprehensive technical skills overview including hardware integration (PCB, Arduino, sensors), AI/ML systems (OpenAI, agent orchestration), full-stack development (React, Next.js, Node.js), and cloud technologies (Vercel, AWS Lambda, Neon Postgres).</description>
  </url>
  <url>
    <loc>https://yaksheng.com/experience</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
    <description>Professional experience timeline spanning Senior Engineer at TeleMedC, Founder of Peasy Labs, and Product Management roles at Shopee, Rakuten Viki, and Photobook. Expertise in hardware startups, medical devices, and consumer-facing products.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/projects</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
    <description>Portfolio of projects including hackathon achievements (ProtoAI, Digital Twin, Travel Insurance Agent, Embodied AI Rover) and personal projects (ETL Pipeline, Telegram AI Bot). Demonstrates expertise in AI/ML, hardware, and full-stack development.</description>
  </url>
  <url>
    <loc>https://yaksheng.com/contact</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
    <description>Contact information and professional links for Richard Lee including LinkedIn profile, GitHub repositories, and portfolio website. Connect for collaboration opportunities in AI/ML systems, hardware integration, and product development.</description>
  </url>
  
  <!-- AI/LLM Documentation -->
  <url>
    <loc>https://yaksheng.com/llms.txt</loc>
    <lastmod>2026-01-06</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.5</priority>
    <description>LLMs.txt documentation for AI language models and crawlers. Contains comprehensive profile information, professional experience, technical skills, and guidelines for understanding this portfolio site.</description>
  </url>
</urlset>
