Working with Prof. Yoo, the successful candidate will work on modeling galaxy clustering and cosmic microwave background (CMB) anisotropies to develop applications to measurements from the Dark Energy Spectroscopic Instrument (DESI) and the Planck satellite. These surveys deliver unprecedent amount of precision measurements of the large-scale structure of the Universe. It is therefore timely to revisit our theoretical modeling of galaxy clustering and CMB anisotropies in detail and ensure that the theoretical predictions for cosmological interpretation of data are as accurate as the measurement precision demands. Going beyond the standard modeling, we will investigate the impacts of systematic errors in theoretical modeling such as a non-zero spatial curvature, relativistic effects, modification of gravity and so on. The successful candidate is expected to have good understanding of theoretical cosmology and working knowledge in numerical computation. Applicants are expected to have a master degree in physics, astronomy, or any other related area. Application material should include cv, a letter of intent, transcripts (undergraduate and master), and master thesis. The applicants should provide at least two names of academic personnel (no reference letter is needed at this stage) who would send reference letters upon request from Prof. Yoo. All the application material should be sent electronically to the address below in one pdf file. The successful candidate can start anytime between Summer and Fall 2024. The position is open until filled. Prospective students are encouraged to apply early and set up a meeting with Prof. Yoo. The applicants will be notified in no later than three weeks, after application is received.