Website loads slowly, crashes or hosting requires updates

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I work with websites that are already running — I step in when there is a problem with site performance or hosting, examine the previous developer's code and server settings, find the exact source of the issue and fix it. The previous developer and documentation are not needed. Typical situations: — website loads slowly, especially on mobile — website crashes when ads or newsletters are launched and traffic spikes — hosting says PHP or database needs updating, and after the update the site stops working — received a hosting notification about a virus, spam or site being blocked — SSL certificate expired, browser says the site is not secure — hosting is running out of space and the hosting bill is growing — need to migrate the site to another hosting or server without losing data or Google rankings — need backups and updates so the site does not disappear after a failure Stack: MySQL, PostgreSQL, Docker, PHP (WordPress, WooCommerce, Symfony, Laravel), TypeScript, Next.js. Ten years in commercial development, currently a backend developer at a product IT company. Based in Riga, working remotely.