Sequoia Capital focuses on investments in the energy, financial services, healthcare, Internet, mobile and technology sectors. Within the energy sector, the firm seeks to partner with start-ups focused on the alternative energy, conventional energy, energy efficiency, energy storage and energy services markets. Sequoia Capital teams with financial services start-ups that specialize in banking, brokerage, payment and enabling technologies. The firm works with healthcare start-ups that enable diagnostic services, healthcare IT, patient services, pharmaceuticals, product development services and enabling technologies. Within the Internet sector, Sequoia partners with start-ups that develop advertising, communications, ecommerce, gaming, media, search, social networking and enabling technologies. The firm interests within the mobile industry include start-ups that program applications, communications, devices, gaming, monetization and enabling technologies. Sequoia Capital seeks to invest in technology start-ups that engineer carrier infrastructure, data, enterprise infrastructure, open source, SaaS, security, semiconductors, services and storage.