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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Experience - Zejiang Guo</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <nav>
        <ul>
            <li><a href="index.html">Introduction</a></li>
            <li><a href="experience.html" class="active">Experience</a></li>
            <li><a href="education.html">Education</a></li>
            <li><a href="others.html">Others</a></li>
        </ul>
    </nav>

    <header class="header-section">
        <h1>Experience & Projects</h1>
        <p>Professional Work History</p>
    </header>

    <main>
        <div class="card">
            <h2>Work Experience</h2>

            <div class="timeline-item">
                <h3>SENIOR SOFTWARE DEVELOPMENT ENGINEER</h3>
                <p class="subtitle">Amazon</p>
                <p class="date">12/2021 - Current</p>
                <ul>
                    <li>Built and maintained tier-1 service enabling no-code configuration of recommendation strategies.</li>
                    <li>Designed and implemented infrastructure for modern ML and GenAI-powered recommendation generation.</li>
                    <li>Tech leader of the recommendation quality optimization, including purchase halo and online quality guard. Also guide related science works.</li>
                    <li>Directed cross-organization collaborations with Shopping foundation AI, gateway experience, and JP marketing teams, etc.</li>
                    <li>Raised new product ideas for weblabs and was top weblab winners for more than 4 years in the org.</li>
                </ul>
            </div>

            <div class="timeline-item">
                <h3>SOFTWARE DEVELOPMENT ENGINEER II</h3>
                <p class="subtitle">Amazon</p>
                <p class="date">09/2017 - 11/2021</p>
                <ul>
                    <li>Developed configurable Recommendations service for strategy creation without coding.</li>
                    <li>Implemented ML and deep learning solutions for customer-related datasets.</li>
                    <li>Launched recommendation features in multiple marketplaces and maintained Your Store/Improve Your Recommendations pages.</li>
                </ul>
            </div>

            <div class="timeline-item">
                <h3>SOFTWARE DEVELOPMENT ENGINEER I</h3>
                <p class="subtitle">Amazon</p>
                <p class="date">10/2015 - 09/2017</p>
                <ul>
                    <li>Developed new recommendation slots for Amazon Your Store.</li>
                    <li>Maintained Tier-1 RecommendationsService for Amazon retail, Kindle, and more.</li>
                </ul>
            </div>

            <div class="timeline-item">
                <h3>C++/C# SERVER-SIDE DEVELOPER</h3>
                <p class="subtitle">Actifact Corp (Contract for United Airlines)</p>
                <p class="date">09/2012 - 10/2015</p>
                <ul>
                    <li>Developed and supported high-volume data transfer systems for Teradata databases on large server clusters.</li>
                </ul>
            </div>

            <div class="timeline-item">
                <h3>SOFTWARE ENGINEER</h3>
                <p class="subtitle">Xunlei Networking Technologies Company</p>
                <p class="date">06/2009 - 05/2010</p>
                <ul>
                    <li>Awarded 'Best Internship Student 2009' (top 5 of ~200).</li>
                    <li>Developed plugins, tools, and games using C++, LUA, and Java.</li>
                </ul>
            </div>
        </div>
    </main>

    <footer>
        <p>&copy; 2024 Zejiang Guo. All rights reserved.</p>
    </footer>
</body>
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