Social Advertising Specialist

We are looking for a Social Advertising Specialist to help us scale customer acquisition through high-performing paid social campaigns.

In this role, you will build, test, and optimize campaigns across channels such as Instagram, Facebook, Tik Tok, Linked In, and other relevant platforms. Your work will directly contribute to qualified demand, stronger creative performance, better conversion quality, and improved marketing efficiency.

This is a good fit for someone who combines performance marketing expertise with creative judgment, analytical thinking, and a structured experimentation mindset.

Wellis is a fast-growing healthtech scale-up reinventing healthcare. We are building the first truly integrated health platform in the Netherlands, offering on-demand care for everyday health needs such as weight loss, hair loss, sexual health, and more.

Our platform covers the full journey: from diagnosis and medical assessment to prescription and delivery  combining medical expertise, technology, and data, we make healthcare smarter, more accessible, more personal, and easier to use.

We are growing quickly, which means we are building the structures, teams, products, and processes that will help us scale responsibly. You will join an ambitious, international team where ownership is encouraged, collaboration is key, and impact is visible from day one.

As our Social Advertising Specialist
, you will join our Marketing team and report directly to the Performance Marketing Lead.

You'll collaborate cross-functionally—with Content, Design, Data, CRM, Medical, and Customer Care—to ensure our campaigns are engaging, compliant, and tightly integrated into the customer journey.

Your immediate focus will be optimizing paid social performance, building a structured creative testing framework, and refining funnel strategies. Over time, you'll help establish a scalable, data-backed performance playbook. Your ultimate goal is simple:
drive high-quality customer acquisition while keeping CAC, POAS, and Profit contribution on track.

• Paid Social Management: Build, optimize, and scale campaigns across Instagram, Facebook, Tik Tok, Linked In, and other social channels.
• Full-Funnel Strategy: Translate commercial goals into smart campaign structures, audience targeting, budgets, and bidding strategies from awareness down to conversion.
• Funnel Optimization: Partner with CRO, Data, and Marketing teams to improve landing page conversion rates and post-click journeys.

• Creative Briefing & Development: Collaborate with Content and Design to brief, test, and iterate on winning hooks, formats, and ad angles.
• Structured Experimentation: Build and manage a rigorous testing roadmap spanning creative formats, landing pages, value propositions, and bidding setups.
• Audience Segmentation: Define and refine high-intent audiences using customer behavior, performance data, and strategic segmentation.

• Performance Management: Monitor key business metrics (CAC/CPA, conversion rates, POAS, Profit) and take swift action to maintain profitability.
• Reporting & Learnings: Translate performance data into clear, actionable insights, risks, and next steps for the broader business.

• Salary range of € 3.800 – €5.200 gross per month, depending on experience
• 8% holiday allowance.
• Pension plan.
• Learning budget.
• Monthly personal budget via Alleo.
• Hybrid working: partly from our Rotterdam office, around 2 days per week.
• 20 remote-working days per year.
• Working from home allowance.
• 25 holidays.
• A culture of short lines, speed, ownership, and continuous improvement, where pragmatism and impact matter.
• The opportunity to help build a fast-growing healthtech scale-up from the inside.

• Paid Social Expert: Deep hands-on experience structuring, scaling, and optimizing paid social campaigns against strict commercial targets.
• Creative & Commercial Thinker: Possess sharp creative judgment—you intuitively know which hooks and messaging build trust and drive action.
• Data-Driven & Analytical: Fluent in CAC/CPA, POAS, and conversion metrics, using data…