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.
Build 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
fonio is building the AI communication suite for small and medium businesses; so no call goes unanswered, no lead gets lost, and no customer is left waiting.
What we do
SMBs lose business every day to missed calls and slow responses. fonio puts AI on the front line of customer communication — handling calls and messages automatically, 24/7, without adding headcount.
Our products
→ AI Phone Agent — answers, qualifies, and routes calls around the clock
→ AI WhatsApp Agent — keeps conversations moving on the channel your customers already use
9,000+ businesses across Europe run on fonio.
Why join us
We're a small team shipping fast from Vienna — building software that thousands of real businesses rely on every day. If you want your work to matter from day one and help define how AI changes SMB operations, fonio is the place.
We're seed-funded, scaling fast across Europe, and hiring across 35+ open roles: from engineering and product to sales and marketing. Come build with us.
