Customer Engineer

About UsAt telli, we're building the firstAI-native phone system.Since launching last year at Y Combinator, we've grown>$2M in annualized revenuewith a team of only 12 people.Today, most B2C companies fail in their customer communication not because they don't care, but because they can't 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.We've 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 RoleThis 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 aCustomer Engineer at telli, you'll sit at the intersection ofcustomer success, support, and engineering. You'll help our customers design, deploy, and scale AI agents that handle thousands of real customer calls every day.You'll become the go-to technical partner for our customers - solving problems, improving performance, and bringing feedback directly to our product and engineering teams.If you're technical, communicative, and thrive in fast-moving environments, this role is for you.*what you'll be responsible for*Customer success from a technical angle: act as the primary technical point of contact for key account customers, from onboarding to scalingDesign and implement AI agents: build, test, and optimize telli agents that handle real customer conversations at scaleSupport and debug: investigate customer issues, troubleshoot technical problems, and work with engineering to ship fixes fastEnable self-service: improve our documentation, prompt templates, and guides so customers can solve problems independentlyHelp shape our platform: surface customer insights, identify missing features, and collaborate directly with product to improve our toolsBuild PoCs, Integrations & Workflows: prototype improvements, create internal workflows, and help build integrations to 3rd party systems*what makes you a great fit*You really enjoy working with customers and help them succeedYou have a good software engineering foundationyou're an excellent communicator in both English and German (additional languages are a big plus) - especially writingyou've built AI agents and understand topics like prompt engineering and evals*you may*notmake a good fit if…****you can only write code with the help of AIyou have a pure business background but want to transition to techyou only like 'strategic' work and don't want to get your hands dirtyyou don't understand how web applications & APIs work under the hoodyou want to work 9–5*perks*above-market pay & equityaccess to any (AI) tool that makes you more productivegym subscriptionregular off-sites with the team