Summary: This Software Engineer role focuses on designing and scaling a platform for real-time AI voice agents in healthcare, involving low-latency speech/LLM pipelines and reliability systems. Highlights: 1. Pushing the limits of real-time AI for human-like voice agents 2. Designing and scaling low-latency speech/LLM pipelines 3. Engineering systems for high-stakes healthcare conversations **About Prosper AI** Prosper AI specializes in AI Phone Agents for healthcare, providing human\-like expertise while significantly reducing costs. Our AI Agents efficiently handle tasks for calling patients and payors such as claims status checks, benefit verification, prior authorizations, patient scheduling, and balance reminders. We aim to eliminate $200B in administrative waste, allowing healthcare professionals to focus more on healing and less on administrative tasks. **What you'll do** At Prosper, we’re pushing the limits of what’s possible with real\-time AI. We’re not just making voice agents that “talk”, we’re engineering systems that sound human, reason under strong latency constraints, and adapt instantly to messy, high\-stakes healthcare conversations. As a Software Engineer, you’ll be at the center of designing and scaling our platform, the low\-latency speech/LLM pipelines, orchestration layers, and reliability systems that make this possible. This is a full\-time on\-site role located in Barcelona with the possibility to move to the New York Office. **What we're looking for** * Bachelor’s or Master’s degree in Computer Science, Engineering, Maths, Physics or related field (or equivalent experience). * 1\-3 years of experience building complex software solutions. * Solid grasp of algorithms, data structures, and software engineering best practices, especially in Python and Javascript/React. * Experience working with LLMs, AI agents or other ML models is a plus. * Founder mindset: ownership \+ hard work. You see Prosper as a learning step for your future startup. * Be ready to handle the challenges of deploying AI voice agents to thousands of daily phone calls. **Interviewing process** * Initial conversation to understand who you are, what you want to do, and where you wanna go (30 minutes) * Work on a take\-home challenge to discuss in the following interview * Review your solution with a couple of engineers from the team (60 minutes) * Talk with the co\-founder (60 minutes) * Offer stage