Jupiter in Scorpio tends to build its sense of purpose around the very subjects most people instinctively turn away from. Finance in its more complicated forms is a natural home: investment, debt restructuring, insolvency work, risk and insurance. Curiously, working with other people's money often goes more smoothly than handling their own, and that frequently becomes the actual job — banking, capital management, investment consulting.
The second broad zone is the mind under strain. Psychotherapy, crisis counselling, hospice care, rehabilitation after trauma. I've known several practitioners with this placement, and they all tend to say the same thing: they're simply comfortable being in the room where another professional would struggle. The dark material a client brings doesn't unsettle them, and they tend to hold the pace of long, slow processes without the burnout that's almost an occupational hazard in that work.
The third direction is the investigation of closed and hidden subjects. Investigative journalism, forensics, the esoteric, the history of secret societies, the diagnosis of rare medical conditions. Anywhere the task is to dig all the way down rather than settle for a comfortable surface, this placement tends to feel at home — and tends to outlast the people who give up halfway.
Authority here tends to come neither from charisma nor from diplomas, but from results in the situations where others quietly backed off. From what I've observed, by around forty the people with this Jupiter have usually built a reputation as the person you go to in the hard moment — not for inspiration, but to untangle the thing that looked unsolvable. And that reputation tends to keep paying them back for the rest of their working life.