about us

At telli were building the first AI-native phone system.

Since launching last year at Y Combinator weve grown >$2M in annualized revenue with a team of only 12 people.

Today most B2C companies fail in their customer communication not because they dont care but because they cant keep up. The sheer volume of calls forces them to outsource to poor-quality external call centers or have their internal teams spend hours on repetitive calls.

With telli our customers now rely on AI voice agents that handle their repetitive calls freeing human agents to focus on what matters - talking to customers when it counts. The result: higher efficiency happier teams and better customer experiences.

Weve seen firsthand that legacy phone systems are not designed for an AI-first world. That is why we are building the first AI-native phone system that lets B2C companies manage both their human and AI teams on one platform.

Our founding team knows this problem inside-out having managed a 150-person call center before. We know how painful and expensive scaling phone operations can be for companies.

There is a lot of work ahead. The opportunity is massive. We are ending an era of poor-quality external call centers.

about the role

This is the perfect role for someone with an engineering background (e.g. CS degree coding bootcamp or business informatics) who wants to apply their technical skills in a hands-on customer-facing environment.

AI voice agents are transforming how companies communicate with customers but integrating them into existing workflows is still complex.

As a Customer Engineer at telli youll sit at the intersection of customer success support and engineering. Youll help our customers design deploy and scale AI agents that handle thousands of real customer calls every day.

Youll become the go-to technical partner for our customers solving problems improving performance and bringing feedback directly to our product and engineering teams.

If youre technical communicative and thrive in fast-moving environments this role is for you.

what youll be responsible for

• Own customer success from a technical angle: act as the primary technical point of contact for our customers from onboarding to scaling

• Design and implement AI agents: build test and optimize telli agents that handle real customer conversations at scale

• Support and debug: investigate customer issues troubleshoot technical problems and work with engineering to ship fixes fast

• Enable self-service: improve our documentation templates and guides so customers can solve problems independently

• Help shape our platform: surface customer insights identify missing features and collaborate directly with product to improve our tools

• Build small proofs-of-concept: prototype integrations create example workflows and explore creative solutions for unique customer use cases

what makes you a great fit

• You have a software engineering foundation you can write and debug simple scripts understand APIs and reason about web applications

• youre an excellent communicator in both English and German (additional languages are a big plus)

• youve built AI agents and understand topics like prompt engineering and evals

• youre great at translating what customers say into what they actually mean

• youre on top of the newest AI trends and have tinkered a lot with AI

• youre still early in your career and hungry to learn

you may not make a good fit if

• you can only write code with the help of AI

• you have a pure business background but want to transition to tech

• you only like strategic work and dont want to get your hands dirty

• you dont understand how web applications & APIs work under the hood

• you want to work 95

perks

• above-market pay & equity

• access to any (AI) tool that makes you more productive

• gym subscription

• regular offsites with the team