Senior Ad Tech Specialist

Senior Ad Tech Specialist (Temp)

Location:
Remote, EU time zonesTeam: Product / DevelopmentContract Type: ContractorContract Duration: 6 months, with possibility of extensionEnglish Level: Professional fluency, C1/C2 mandatoryAdTech

Experience:
MandatoryReports to: CTOIMPORTANT This is a temporary 6 month contractor position, with the possibility of extension depending on business needs and performance.
Professional English proficiency is mandatory for this role.
Candidates must also have significant previous experience in programmatic AdTech.
This is a senior position and is not suitable for candidates looking to transition into AdTech without prior industry experience.
About Refinery89Refinery89 is a Dutch AdTech company headquartered in Madrid, working with premium publishers around the world to optimize their programmatic advertising performance.
Through advanced technology, data, and hands on technical support, we help publishers increase advertising revenue, improve efficiency, and gain greater transparency across their monetization stack.
Our international team operates at the intersection of technology, digital advertising, data, and publisher operations.

About The Role
We are looking for a Senior Ad Tech Specialist to join our Product and Development environment and take ownership of complex technical investigations across live publisher advertising stacks.
This is a deeply technical role focused on diagnosing issues, reproducing problems, identifying root causes, validating solutions, and translating findings into clear specifications or fixes that our Development team can act on.
You will work directly with live publisher environments, Prebid, Google Ad Manager, Amazon APS, consent frameworks, SSP integrations, browser debugging tools, and the wider programmatic ecosystem.
The objective is simple: when something is not behaving as expected, you should be able to determine what is happening, prove why it is happening, and define what needs to happen next.
The role also supports Product decisions, roadmap prioritization, and technical go or no go decisions with evidence from real publisher environments.
What You Will DoTechnical Support and EscalationsOwn complex technical issues that Operations or Development teams have been unable to resolve.
Investigate tag defects, rendering failures, consent issues, bid path problems, and unexpected revenue behavior.
Reproduce issues using live publisher inventory and controlled staging environments.
Identify root causes and distinguish structural limitations from configuration problems that can be resolved.
Produce clear technical specifications or patched tag implementations before handing work over to Development.
Live Ad Stack DebuggingInvestigate publisher implementations directly at browser level.
Use Prebid debugging, network requests, browser consoles, HAR files, and consent string inspection to understand what is happening.
Validate request ordering, consent propagation, and bidding behavior against the intended configuration.
Confirm fixes in live environments before considering an issue resolved.
Ad Stack AuditsPerform structured audits across publisher monetization stacks.
Review areas including Prebid configuration, Google Ad Manager, Amazon APS, CMP and TCF implementation, floor models, ad units, identity solutions, video, SSP health, and bidder performance.
Score findings and produce clear action plans prioritized by impact and severity.
Ecosystem MonitoringTrack technical changes across Google, Amazon APS, Prebid.
Js, SSP partners, and the IAB Tech Lab.
Assess how ecosystem changes may affect the Refinery89 stack and publisher implementations.
Translate findings into clear technical recommendations.
Escalate decisions when changes require Product or Development involvement.
Rollouts and Technical ValidationSupport phased technical rollouts using clearly defined success metrics.
Establish validation criteria and rollback conditions.
Test implementations in staging environments before Development handoff.
Monitor performance following deployment and validate results against agreed thresholds.
Must Have SkillsAt least 5 years of experience in programmatic advertising technology, preferably within publisher monetization or the supply side.
Significant hands on experience diagnosing and debugging live advertising environments.
Deep working knowledge of Prebid.
Js, including configuration, adapters, modules, identity solutions, floors, and debugging.
Ability to inspect and understand bidder adapter source code when documentation alone is insufficient.
Strong technical knowledge of Google Ad Manager, including line items, pricing rules, AdX, dynamic allocation, GPT implementations, and MCM models.
Strong understanding of IAB TCF 2.
X and GDPR consent mechanics, including how consent is propagated across Prebid, GAM, and Amazon APS.
Understanding of OpenRTB and supply chain transparency standards including ads.
Txt, sellers.
Json, and schain.
Strong JavaScript knowledge, with the abil