Developer Platform - Microblog & survey

A developer platform has multiple definitions but mine is this - something that enables the developer community and anyone else that's involved in writing and shipping code. It needs to live up to all the industry buzz words like - 'high quality', 'faster time to market', 'cost efficiency', 'ease of use' and such. Ultimately, all this contributes to 'developer experience' - IMHO, this is something that enables teams to make their way through various software development lifecycle phases with ease to release a product to its customers.

There are so many companies doing various things in developer experience. Ex: GitLab, Harness, AWS, Google etc. But I've been curious - What developer platforms do you or your companies prefer and why? Let me know in comments!