You may be on to something. Of the companies in your query, only Microsoft has results on the same scale as the 'engineer' query (6-8% of jobs posting). And,

You may be on to something. Of the companies in your query, only Microsoft has results on the same scale as the 'engineer' query (6-8% of jobs posting). And, Microsoft has a downturn that is visually similar as the 'engineering' query. So, it could be that another big player or major deal recently landed and increased the job mix. Or, it could be an effect of Microsoft's recent recruiter layoff (I only know about this because a friend was affected -- no idea how widespread, etc.). I don't know, but your data has a reasonable narrative.