I applied online. The process took 3 weeks. I interviewed at BT Group (Darlington, North East England, England) in Aug 2022
Interview
I saw the role was advertised on Linkedin then I clicked on their official website and applied through their web. First, there was a phone screening call from HR. After that was an online interview with the hiring manager (~30 mins), followed by a face-to-face interview (~2 hours) which included technical test. The interview process ran smoothly and I got the offer after 3 weeks since applied. Good luck to whoever reads this as I did lots of research when I received a call back from HR.