Unscheduled pay bumps, executive-level poaching, and employees that quit for a better offer on the first day of a new job: ad tech employees are reaping the benefits of an overheated job market — and companies are struggling to keep up. The industry is flooded with job openings as the industry prepares for the demise of the third-party cookie, an opportunity that’s leading to a surge in public offerings and creating cash-flush ad tech firms looking to put the money to work with new hires.