Dishwasher
Cook
Fitness instructor
Graphic artist / proofreader
Graphic art dept. supervisor
Systems administrator
Web developer
Retail clerk
Data entry clerk (ugh, graveyard shift)
Database administrator/Data architect
Systems developer/Software developer
Web developer
IT manager
Army officer
Scientist
Musician/Composer (there’s at least one person who would disagree that I’m competent 
)
I think that’s it.
I could do a reasonably competent job as:
High school math tutor (high school)
Foot soldier (army service)
Waiter (army service later on)
Construction site monkey (student job)
Web developer (student job and previous employment)
Translator (student job)
CS researcher (well, that’s my degree so at least academic officials think I’m competent)
System administrator (current employment)
Chef (hobby)
Winemaker (hobby).
Paid work? Other than after school and summer jobs (book store worker, condominium unit finisher, medical researcher) my job titles (as occurred chronologically) were:
Resident physician
Physician
Physician supervisor
Associate medical director
Acting medical director
Physician (a wonderful ‘demotion’ where I finally gave up management after 17 years of it)
Retired relatively inert person
As a physician, I was quite competent. I was less good being a supervisor/director, mainly because I came to loathe administration. But it was amazing (and scary) how most folks (above and below me) thought I was great at running things.
I’m not much good for any other sort of employment, frankly. Within the scope of medicine, I’m more of a jack of all specialties but master of none. Yet so much better (for me) than being a master of one.
I’m not sure I can do much of anything without being a self-aggrandizing dick, but…
• home health aide / nursing assistant
• dishwasher and cook, small restaurants
• auto mechanic
• janitor
• copy editor / essay & term paper ‘mechanic’
• worked on a roadbed cutting crew
• FileMaker developer: vertical-market, corporate in-house dev & support, and other
• Panorama developer (one stint)
• Tango/Witango developer
• office manager
• typist
• sound editor
• social worker (advocacy work, elder abuse)
• social work (community building, personal counseling)
• data entry technician
• php, SQL, FileMaker, web-database integrator
• receptionist
I had “risen” to supervising 20+ people over three layers of management, twice in my career. I found it terrifying and stressful. But I got good reviews and my LinkedIn page has a bunch of people saying I’m a great boss.
If you’re very personally invested in your results, I think management is draining.
Newspaper Collation
Fast Food (various mundane tasks)
Retail (stocking, cashier, etc)
Retail Management
Television Master Control Operator
Insurance & Inventory data entry (different jobs but same deskbound wage-slave tasks)
Landscaping
Commercial Landscape Estimating
The newspaper collation is sort of amusing since it was a shitty high school job but probably in the top three jobs I’ve done that anyone finds interesting to hear about.
Usual assortment of high school jobs
Mormon missionary. Although not paid, it was full time, and I have talked about that experience here.
Campus security full time for three years. I
Translation, editing and sales in a small translation / documentation company in Japan.
Importing / sales / management in importing in Japan.
Teaching in Taiwan / Japan with a range of jobs from adults, bilingual schools, regular schools and even taught kindergarten
These posts tell some interesting career paths. I suspect there are some good stories to be told. My path less interesting.
Runner at the Board of Trade between High School and college.
Dishwasher/busboy/server while in college.
Not sure if I can count diener in the morgue and balloon pump technician, part time jobs during med school. I was competent and they were jobs?
Pediatrician with some administrative roles for periods of time. Same group for 35 years now even as we joined up with other practices and became over the years a large thing.
Similar sentiments. The administration role, done more to try to have positive impact than for its pittance of compensation, ended up being an exercise in futility and frustration as the company grew. I got worn down. But I still love what I do in the office day to day and cannot imagine that I’d be much good at much else.
Let’s see which jobs I’ve been paid for for more than 6 months at a time…I’m including significant self-employment there:
Mailroom clerk
Digitizer/GIS clerk
Film Extra
Survey-taker
Mine Geologist
Barman
Software Developer (I’m including all kinds of software, from web development to front-end to SQL to embedded systems)
Business Analyst
Graphic Designer
Trainer (in systems, not body)
Copywriter
Leatherworker
That’s an even dozen jobs I’d say I was competent at. I’d only consider myself a “professional” at 4 of those, though - geologist, designer, developer, trainer. And of those, geology is the only one I consider myself to have enough different experience from most people to mean anything.
In HS, soda jerk and then stock boy in auto parts store
In college, technician in biophysics lab
Then Instructor, Asst. Prof, Assoc. Prof, Prof in mathematics. Successfully avoided being chair (it was close) or higher administrator, that I would not have been competent to do.