Offer: 320k gross (~280k net) + quarterly bonus of 20%. How do you find the conditions?

Conditions with an offer of 320k gross (~280k net) plus a quarterly bonus of 20% seem competitive for a senior Golang developer, especially when considering the bonus as an additional reward to the stable part.

It is important to clarify the details of the bonus: what criteria it is paid based on, how achievable the goals are, and whether there is an opportunity for salary growth. Also, attention should be paid to the social package, training and development opportunities, as well as the corporate culture.