We grew from $1M to $10M ARR in under 12 months and now serve 10,000+ customers.
Fonio is Europe’s market leader for AI phone agents for SMBs. Now we’re expanding globally and into new products.
We move fast, take ownership, give direct feedback, and avoid politics and unnecessary meetings.
Join one of Europe’s fastest-growing companies.
As our Marketing Engineer, you sit at the intersection of data science and paid media. You'll consolidate scattered customer signals into a single source of truth, build ML models that score leads by their real value, and feed those insights back into our ad platforms - making our marketing smarter than the platforms' out-of-the-box optimization. It's a hands-on, build-from-scratch role with full ownership over both the models and the impact they create.
What to expectBuild our predictive CLTV modelling from the ground up: consolidate customer signals into a database, develop ML models on user behavior to score leads
Feed those scores back into the ad platforms (Meta, Google, and more) to sharpen targeting and bidding
Own tracking and conversion infrastructure: Tag Manager, Search Console, offline uploads, server-side setups
Turn raw behavioral data into measurable performance impact
Work closely with the Performance Marketing team and Go-to-Market managers
You're comfortable building data pipelines and ML models - Python, SQL, and modern ML tooling are second nature
You understand paid media well enough to know what signals matter and how platforms consume them
Experience with attribution, conversion APIs, or offline conversion uploads is a strong plus
Hardworking, analytical, structured, and a natural fit for a direct, ambitious culture
Strong English skills, as English is our company language
German skills are a big plus
Competitive Salary: €65.000-€130.000
Equity - you build it, you should own a piece of it.
Food & drinks - at our Vienna office, lunch and dinner are on us (plus all the drinks your heart desires, and yes, we have protein bars and vitamins too).
Relocation bonus (if you still need to move to Vienna)
Equipment of your choice - whatever makes you happy.
Regular team offsites.
15 min intro call
30 min skill interview
15 min Culture fit with the founders
Skills Required
- Experience building data pipelines and machine learning models
- Proficiency with Python
- Proficiency with SQL
- Familiarity with modern machine learning tooling
- Understanding of paid media and meaningful advertising signals
- Strong English skills
- Experience with attribution, conversion APIs, or offline conversion uploads
- German language skills
- Analytical and structured working style
- Hardworking and comfortable in a direct, ambitious culture
What We Do
fonio’s AI phone assistant answers calls, takes the load off your team, and ensures you’re reachable 24/7, so no lead, customer, or opportunity is missed, for businesses of any size.
