Really interesting article about enabling longevity and success as a software developer, but it matches my view on all kinds of skilled work: whatever your employment arrangement, treat yourself as an old-fashioned professional.
Like a doctor or barrister, more tied to your profession than to one job. You need to be effective in your role, build your reputation by demonstrating your skills are beyond the bare minimum, and continually develop yourself as you go along. Ideally you get lots of win-wins: your 'extra' is a win for the company in the long run, and you come out of it a little wiser, and over time you're more effective due to the effects of past 'extra'. The benefits of these win-wins can be pretty intangible, but they do build up over time.
Like a doctor or barrister, more tied to your profession than to one job. You need to be effective in your role, build your reputation by demonstrating your skills are beyond the bare minimum, and continually develop yourself as you go along. Ideally you get lots of win-wins: your 'extra' is a win for the company in the long run, and you come out of it a little wiser, and over time you're more effective due to the effects of past 'extra'. The benefits of these win-wins can be pretty intangible, but they do build up over time.