I've been working at my current job at a software company of just over 100 employees, for just over a year now, as my first job out of university here in the UK. I'm employed as an Operations Engineer so supposed to be doing Tech/Dev Ops but, for the first few months I was basically just doing second/third-line support
The past six months or so, I started working more closely with our SysAdmin and doing pretty much all the Internal IT and some management of our VMs and other servers. This culminated about a month ago when the SysAdmin left leaving me the sole person responsible for all the internal IT and management of our VMs and servers, some of which I have very little experience with and don't feel especially comfortable being solely responsible for. As a result, I have become a single point of failure and come under what seems to me an unreasonable amount of pressure
In that time we've had a couple of systems fail, need emergency maintenance, or new systems to be set up urgently. This past week, I ended up staying late a total of 8 hours, i.e. a whole extra day. Per my contract, this overtime comes with no extra pay (although when I became the sole SysAdmin, I did get a substantial pay rise), being told things like "you're not allowed to go home until this is working". This was also after a week where, the day of the Office Christmas Party when I was supposed to leave at 2 I ended up working until 4 before eating which left me ill enough that I had to skip the party and was off sick for the remaining 3 days that week
I understand that as SysAdmin I will occasionally have to work overtime, possibly at short notice, but this amount is clearly unsustainable for my health, and strikes me as unreasonable. I should also note that several other Devs who've left recently have done so largely due to the expectation of unreasonable hours
So my question is, how best do I handle this? I had planned to stick around for another year or so before moving on, my coworkers are great, and up until this month, I've generally enjoyed the work but this doesn't seem sustainable. Should I talk to the CTO (who's also my manager) to try and get someone else with a bit more experience on board, or should I focus on updating my CV and looking for somewhere likely to be more reasonable/understanding?