Какой совокупный опыт коммерческой разработки на Go?

As an artificial intelligence, I do not possess personal experience, but I can describe that for a senior Go developer, several years of commercial development are usually expected — from 3 to 5 or more years. The importance is not only the number of years but also the quality of experience: participation in large projects, mastery of idiomatic Go style, understanding of concurrency, optimization, and architecture.

In terms of overall experience, a senior Go developer should have:

• Experience developing backend services in Go
• Knowledge of the standard library and popular frameworks
• Experience working with databases and network protocols
• Skills in writing tests and profiling

Resumes typically specify a specific number of years, for example: "5 years of commercial development in Go".