I have never worked in an environment which might be called toxic or anything that comes close. we don't do that this side of the ocean. however there are still things to keep in mind.

-if they do scrum use jira have an open plan office or talk about estimates then those are big contra-indicators. if you get freedom about work times that's good.

-scrum is there to have better control over you aka big brother is watching you. same for an open plan office (especially if the entire team sits together). this makes for an environment where you feel watched all the time.

- if they want you to come in at a specific time that's also because they want to watch your entire work-day.

- if they talk about estimates this often means a focus on efficiency and a lot of pressure.

- if they use jira then you won't have a say about what you will do and are probably just a code monkey.

- on the other hand, if they give everyone their own office, let people work from home or give you more freedom about which time you come in then this means they trust their employees and are a good choice.

- if they ask you your opinion about things that matter then this is good too (it means they are not just hiring you as a code monkey).