This goes back to what I said earlier: If the work environment is dysfunctional, then you should either work towards fixing it (especially if you're a senior engineer) or work towards finding a better job. Software engineers are one of the few career paths afforded the ability to do so and it would be better for us as a whole if there was less normalization of awful development practices under the guise of 'everyone else has experienced this or does this'.

This goes doubly true for startups in my opinion because rushing things like this and having a shaky foundation just adds another point of failure to your organization. Remember for every startup that succeeds, multitudes of others fall flat on their face due to a build up of problems.