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Senior Fullstack Engineer

fonio • German • English: C1 • Conversational AI • AI Agents • JavaScript • TypeScript • Node JS • 9 months ago
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Salary
$89k – $134k per year
Location
Remote (EU)
Seniority
Senior
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 27, 2026. First seen by Alion on Jan 20, 2026. fonio scores A on the Alion truth index.

Overview
Company
Impact
Profile match

fonio

fonio is a Vienna-based software company that builds AI phone agents which answer calls around the clock for small and medium-sized businesses, qualifying callers, booking appointments and sending call summaries. The company reports growing from 1 million to 10 million US dollars in annual recurring revenue within a year, serves more than 10,000 customers and has entities in Europe and the United States as it expands into new markets. It hires account executives, sales development representatives and partner managers for German, French, Italian, Spanish, Polish, Dutch and UK markets, plus product, fullstack and forward deployed engineers and growth and finance staff.
fonio.ai • HQ: Vienna, Austria • AI Agents • Conversational AI • 501-1000 employees • Est. 2024
Tech stack of fonio
Backed by Angel Invest

Über fonio

Wir sind in weniger als 12 Monaten von 1 Mio. auf 10 Mio. US Dollar ARR gewachsen und haben bereits jetzt über 10.000 Kunden.

Fonio ist der europäische Marktführer für KI-Sprachagenten für SMBs. Nun expandieren wir weltweit und in neue Produktbereiche.

Wir agieren schnell, glauben an ein hohes Maß an Ownership, leben direktes Feedback und verzichten auf Company-Politics und unnötige Meetings.

Werde Teil einer der krassesten Wachstumsstories in Europa.

Deine Rolle

Als Senior Fullstack Engineer übernimmst du End-to-End Ownership: von der Idee über den Prototyp bis hin zum fertigen Feature, das von tausenden Unternehmen europaweit genutzt wird.

Wen wir suchen

Senior Fullstack Engineers bei fonio haben volle Ownership über den value, den sie für unsere Kunden stiften. Es gibt bei uns niemanden, der dir sagt was Du bauen sollst - das definierst Du selbst.

  • Extremes Growth Mindset

  • Viel Erfahrung mit TypeScript, React und Node.js (idealerweise NestJS) in einem SaaS-Produkt

  • Pragmatismus: Du zerlegst Features in die essenziellen Teile, die sofort Kundennutzen schaffen - und entwickelst sie mit neuen Erkenntnissen weiter

  • Deutsch als Muttersprache, um unsere KI aktiv mitzugestalten, sowie fließend Englisch.

Deine Aufgaben

  • Weiterentwicklung unserer Plattform in NestJS & React

  • Direkter Austausch mit Kunden (Support, Feedback, User-Tests)

  • Mittelfristig: Übernahme der Feature / Opportunity Priorisierung unserer Voice AI

Was wir dir bieten

  • Kompetitives Gehalt: €80.000-€120.000 pro Jahr

  • 100% Remote: Falls du aber Lust auf Office hast, haben wir eines der coolsten Offices im 7. Bezirk in Wien (Lunch & Dinner included)

  • 100% Focus Time (keine regulären Meetings)

  • Unlimited Budget, wenn der ROI stimmt

  • Extremer Speed (wir shippen fast täglich)

  • Tausende begeisterter Kunden, die das Produkt gemeinsam mit uns entwickeln.

Bewerbungsprozess

  • 15 min Kennenlernen

  • 30 min Deep Dive mit CTO & Co-Founder Matthias

  • 90 min Technical Interview mit Case Study / Live Coding

  • 20 min Culture Fit mit den Gründern

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