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Sebastian Stein
Sebastian Stein Sales Engineering Leader · Stuttgart

Blog

Thoughts on Zero Trust, Sales Engineering, and building a career in enterprise tech.

7 posts

Understanding your equity offer

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"We're offering you 10,000 stock options" sounds great. But what does it actually mean? Here's how to evaluate what your equity package is really worth.

What I wish I'd known about startup funding

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After 8 years at a public company, I started evaluating startups as potential employers. I quickly realized: I had no idea how their financing actually works. Here's what I learned.

Zero Trust is not a product

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There's a slide I've seen hundreds of times. It shows a before-and-after: castle-and-moat on the left, Zero Trust on the right. The implication is clear - buy this product, get Zero Trust. It's a good slide. It's also misleading.

Why I left after 8 years

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Eight years is a long time at one company. Especially in tech, where two years feels like a career. I joined Zscaler in 2018 as an individual contributor. Left in late 2025 as Major Accounts Manager. So why leave?

Notes on being a Sales Engineer

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I've been a Sales Engineer for most of my career. It's a role that's often misunderstood, sometimes by the companies that hire for it. These are some notes on what the job actually is.

VPN is not dead

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I've spent years selling Zero Trust solutions. Part of the pitch was always: VPN is dead. Legacy. Here's the uncomfortable truth: VPN is not dead. And pretending it is creates problems.

The POC trap

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"Let's do a POC." Four words that can save a deal or kill it. In enterprise software, the proof of concept has become reflexive, requested by default, granted without question. That's a problem.