About telli
telli is a Berlin-based Y Combinator-backed startup (Fall ’24 batch) building AI voice agents that transform how businesses communicate with their customers. We believe voice is the most natural way humans communicate, but high-quality voice interactions have historically struggled to scale. Our mission is to help businesses bring their customer communication channels into a new AI-first era with simple, tailored tools.
In just a few months since our founding in 2024, we’ve grown to six-figure ARR and raised a $3.6M seed round from top-tier investors including Y Combinator and a leading European seed fund.
The Role: Founding Product Engineer
We’re seeking a driven founding product engineer with high agency to join our growing team in Berlin. As one of our early engineering hires, you’ll have significant impact on our product direction and technical foundation.
Your Responsibilities
- Work closely with customers to understand their problems and develop innovative product features
- Build scalable backend infrastructure capable of handling thousands of AI phone calls daily
- Design intuitive customer experiences for non-technical users
- Contribute to our full technology stack including TypeScript, React, TanStack, Node, Postgres, and temporal.io
- Shape the technical direction of a fast-growing AI startup
What Makes You a Great Fit
- Strong product mindset with ability to deliver end-to-end features
- Experience working in fast-paced environments with high ambiguity
- Technical skills overlapping with our stack (frontend engineering, server development, databases, cloud providers)
- Interest in LLM and Voice AI technologies
- Collaborative approach with desire to make an impact from day one
- Preference for in-person work in our Berlin Mitte office
- Drive to go beyond the standard 9-5 mindset
Compensation & Benefits
- Salary range: €70,000 – €120,000
- Equity range: 0.3% – 1.3%
- Access to cutting-edge AI tools that enhance productivity
- Gym subscription
- Beautiful office in central Berlin (Mitte)
- Company trip to San Francisco planned for fall 2025
- Opportunity to work with a small, high-performing team in a low-ego environment