Workload I was shouldering myself was too much at times. This is partly on me for not saying 'no' enough (those also like this at work, you know what I'm talking about). But often there were tasks that no-one else was able to cover and I therefore had to take up to ensure they were completed on time.
Sometimes general operations could be quite disorganised and require just graft to get things done. Some of the things I've done for Toast, such as literally crumbing/drying bread for brews in a bakery when things got desperate, definitely weren't in the job description. But that's startup life I guess!