I applied online. The interview process was all online. The process was very fast (< 1 week). There were three rounds. The first round was with the CSO, it was a general introduction round. The second round was a Python coding round with the CTO and a photonics engineer where they test fundamentals, bug finding questions, code complexity, etc. The last interview was a photonics interview with the CSO and a photonics engineer testing photonics fundamentals. Very smooth process.