It was a long process that took nearly 3 months. The recruiter reached out to me after 2 months of application and there was 2 levels after that lasted around 1.5 months. The total interview process was included a hiring manager review and technical session at london office. Both went well and the manager promised to give a callback within 1 week. But they ghosted me after the whole process without updating about the outcome. I always thought siemens as a company with integrity but turned out a disappointing one.