Senior Software Engineer

Prosper AI

Senior Software Engineer designing and scaling AI Phone Agents for healthcare at Prosper AI. Leading the engineering of systems that handle high-stakes healthcare conversations and tasks.

Posted 4/12/2026full-timeBarcelona • 🇪🇸 SpainSeniorWebsite

Tech Stack

Tools & technologies

Distributed SystemsPythonReactTypeScript

About the role

Key responsibilities & impact

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.

Requirements

What you’ll need

3-5 years of experience building products end-to-end
A strong understanding of the technologies that power our stack or their equivalents in other languages: FastAPI (Python) backend with a React (TypeScript) frontend.
Experience managing large scale distributed systems with asynchronous workload orchestration.
Familiarity with LLMs, AI agents or other ML models is a plus. We use Pipecat for our voice agents.
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.
Bachelor’s or Master’s degree in Computer Science, Engineering, Maths, Physics or related field (or equivalent experience).

Benefits

Comp & perks

Flexible work arrangements
Professional development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

FastAPIPythonReactTypeScriptdistributed systemsasynchronous workload orchestrationLLMsAI agentsML modelsvoice agents

Soft Skills

ownershiphard workfounder mindset

Certifications

Bachelor’s degree in Computer ScienceMaster’s degree in Computer ScienceBachelor’s degree in EngineeringMaster’s degree in EngineeringBachelor’s degree in MathsMaster’s degree in MathsBachelor’s degree in PhysicsMaster’s degree in Physics