Jr. Web Technical Specialist (Intern)

Junior Web Technical Specialist Intern

Location: Madrid Spain Onsite

Team: Publisher Success

Position Type: Internship

Refinery89 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.

We are looking for a Junior Web Technical Specialist Intern to join our Publisher Success team in Madrid.

This internship is designed for a student recent graduate or early career candidate who already has a foundation in HTML CSS and JavaScript and wants to gain practical professional experience working with websites technical troubleshooting data and advertising technology.

You do not need previous AdTech experience. We will train you on the AdTech side from zero.

During the internship you will work with real publisher websites browser developer tools HTML CSS JavaScript advertising technologies reporting platforms and technical diagnostics while receiving support and guidance from experienced members of the team.

The internship is ideal for someone who wants to develop practical technical skills and explore a career around web technologies troubleshooting data publisher support and Technical Account Management.

Website Troubleshooting

Support the investigation of technical issues affecting publisher websites.

Use browser developer tools to inspect HTML CSS JavaScript scripts network activity and browser errors.

Help identify issues related to page structure styling scripts advertising tags or website configuration.

Reproduce technical problems and investigate their likely cause.

Review browser console errors and network requests when diagnosing issues.

Gather the technical information needed before escalating more complex problems to senior team members.

Publisher Monitoring

Support the monitoring of publisher websites and identify unusual behavior.

Perform regular technical health checks.

Help spot problems affecting advertising performance or website functionality.

Investigate whether changes on a website may be affecting advertising delivery.

Learn how different components of a publisher website interact with advertising technology.

Data and Performance

Learn to interpret advertising metrics such as CPM RPM fill rate impressions and revenue.

Identify unusual changes in performance.

Support investigations into whether an issue may be technical commercial or related to traffic.

Use data to support technical investigations.

Work with spreadsheets and internal reporting tools.

Technical Communication

Create clear technical handoffs including screenshots URLs browser information and descriptions of the issue.

Learn to explain technical findings in simple and understandable language.

Support communication with publishers in English about technical issues and their resolution.

Collaborate with Technical Account Managers developers advertising specialists and other internal teams.

You will receive structured onboarding and gradually develop knowledge in areas including:

Advanced website troubleshooting.

Browser developer tools.

JavaScript troubleshooting.

Network requests and browser debugging.

APIs and web technologies.

Google Ad Manager.

Prebid.

SSPs.

Programmatic advertising.

Advertising tags and website integrations.

Publisher monetization.

Reporting and performance analysis.

Technical Account Management.

You are not expected to know AdTech before joining.

Fluent professional English.

Practical knowledge of HTML CSS and JavaScript.

Basic understanding of how websites are structured and how front end technologies interact.

Some experience using browser developer tools to inspect websites troubleshoot issues or understand page behavior.

Strong technical curiosity.

Strong problem solving skills.

Comfort investigating unfamiliar technical problems.

Clear written and verbal communication.

Basic numeracy and confidence working with percentages and data.

Reliability and attention to detail.

A genuine eagerness to learn.

The confidence to say I dont know yet but I can investigate.

Professional experience is not required.

Your experience can come from university projects bootcamps internships freelance work personal websites GitHub projects or technical side projects.

We are particularly interested in students recent graduates or early career candidates from areas such as:

Computer Science.

Software Engineering.

Web Development.

Programming.

Information Technology.

Telecommunications.

Data.

Engineering.

A formal technical degree is preferred but not required if you can demonstrate practical technical experience.

To participate in this internship you must be legally eligible to complete an internship in Spain.

Candidates should be enrolled in an educational program or otherwise be eligible to complete an internship agreement through a university educational institution or training provider.

Please confirm your internship eligibility when applying.

Experience building or maintaining websites.

Experience troubleshooting JavaScript errors.

Familiarity with the browser console.

Familiarity with network requests.

Experience working with APIs.

Basic understanding of HTTP requests responses and browser behavior.

Exposure to databases.

Git or GitHub experience.

Personal technical projects.

Experience helping users solve technical issues.

Basic spreadsheet skills.

Spanish language skills are considered a plus but are not required.

Dutch language skills are considered a plus but are not required.

This internship could be a strong fit if:

Something on a website stops working and your instinct is to investigate why.

You are comfortable opening browser developer tools and inspecting what is happening behind a page.

You have worked with HTML CSS and JavaScript through your studies personal projects or previous experience and want to apply that knowledge in a real business environment.

You see an error in the browser console and want to understand what caused it.

You enjoy solving technical problems even when you do not immediately know the answer.

You like working with both technology and people.

You want to gain professional technical experience without necessarily following a traditional software engineering path.

This is not a traditional software development internship.

You will not spend your internship building applications developing product features or working as part of a software engineering team.

The internship focuses primarily on web troubleshooting technical investigation publisher support advertising technology performance monitoring and Technical Account Management.

You will use HTML CSS JavaScript browser developer tools and other web technologies to investigate and understand technical issues but the core focus is troubleshooting learning and technical support rather than software development.

Our interview process consists of three stages.

1. Initial Screening

A short introductory conversation with our recruitment team to understand your background motivation English level internship eligibility and technical experience.

2. Team Interview

A conversation with the Hiring Manager or Technical Account Management team focused on your technical curiosity web knowledge problem solving approach and how you investigate unfamiliar problems.

3. Practical Technical Exercise

A practical exercise designed to understand how you approach website related technical problems and learn unfamiliar concepts.

You are not expected to know AdTech before completing the exercise.

We care about your existing web fundamentals your reasoning process your willingness to learn and how you approach technical problems.

This is an onsite internship based in Madrid Spain.

If you are studying or starting your technical career already have experience with HTML CSS and JavaScript through your studies or personal projects enjoy understanding how websites work and want to gain practical professional experience across web technologies troubleshooting data and AdTech we would love to hear from you.