How did you figure out initial grant sizes at your startup?

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We're a seed-stage startup with around 25 employees, and we're in the process of scaling up our team significantly. As part of that, we're trying to formalize our equity grant guidelines, and I'd love to hear how others approach grant sizing.

How are you determining initial equity amounts across different roles and seniority levels? Do you lean more on percentage-of-company benchmarks, dollar value ranges, or another methodology entirely? Also, how do you think about the balance between technical and non-technical roles when equity expectations can differ widely?

Would appreciate any frameworks, resources, or rules of thumb that have worked well for you, especially pre-Series A teams.