Senior JavaScript / Prebid Engineer (Web AdTech)

TL;DR

Senior JavaScript / Prebid Engineer (AdTech): Building and optimizing a high-performance advertising platform with an accent on Prebid.js header bidding and high-scale on-page rendering. Focus on reducing latency, improving auction efficiency, and developing dynamic React-based widgets.

Location: Remote (Brazil)

Company

hirify.global is a global technology company delivering high-impact projects for clients worldwide.

What you will do

• Architect and optimize a custom Prebid.js-based header bidding stack.
• Build and maintain high-performance JavaScript integrations for publisher websites.
• Improve latency, auction efficiency, and yield optimization across ad units.
• Develop and enhance React-based widgets for rendering dynamic local listings.
• Collaborate on bidder integrations, adapters, and demand partner connections.
• Debug complex issues across browser environments, third-party scripts, and ad exchanges.

Requirements

• 5+ years of JavaScript engineering experience.
• Strong understanding of browser performance, async loading, and script execution.
• Experience with AdTech ecosystems (Prebid, GAM, DSPs, SSPs) or high-scale real-time JS systems.
• Familiarity with header bidding concepts such as auctions, bid requests, and latency tradeoffs.
• Experience debugging third-party script conflicts and optimizing page performance.
• Must be based in Brazil.

Nice to have

• Direct experience with Prebid.js customization or bidder adapters.
• Exposure to analytics, tracking, and attribution systems.

Culture & Benefits

• 30 paid days off per year for vacation, holidays, or personal time.
• 5 paid sick days, up to 60 days of medical leave, and 6 paid days for family events.
• Partially covered health insurance after the probation period.
• Wellness bonus for gym memberships and sports nutrition.

Hiring process

• CV submission in English.
• Introductory call with a Recruiter.
• Internal technical interview.
• Client interview.