appstore Description Crawler Goal: Crawl 1 million App information from Huawei App Store Skill: Python, Scrapy, MongoDB, Proxy, Scrapyjs Performance: 100 pages/second Architecture Recommender Goal: Recommend ten Apps related for each App Skill: Python/Java, collaborative-filtering algorithm, cosine-similarity Performance: 1 second/app Architecture Front-end Goal: Display the list-page and detail-page Skill: Java, Spring MVC, Hibernate/ JavaScript, Node.js, Meteor, MongoDB Performance: 1k QPS Architecture