I am highly skilled at Low-level Design and High-level Design Algorithm and Data Structures. These skills are absolutely necessary to get a job at Big MNC and even startups are asking the same level of questions now. My task will be to guide you precisely key point certain materials and directions you can start from. These resources are all personally tried and tested by me. This will reduce your time to search and get lost in vast list of useless resources about the above mentioned topics.