Tense, 1 on 1 in a middle of a big office with lights only on the table 3 people interviewing you, 1st Tech lead, 2nd Senior Dev, 3rd HR. First it starts with HR asking to introduce yourself, interests, backstory, why IT, why this company. Most of the theoretical questions are asked by a Senior Developer, asks following questions and requires an explanation to everything you mention. Tech Lead makes corrections of questions and answers, gives hints, helps, encourages, watches you in general perspective, mostly chill.