One of the fastest-growing AI-native startups that collaborates with Joppy is looking for a Senior Backend/Full-Stack Engineer (primarily backend) with +8 years of experience to help build our conversational, agentic AI platform, integrations and APIs. You'll architect and scale production-grade systems supporting hiring, onboarding, and employee experiences in real enterprise environments, working with LLMs and autonomous agents as part of the stack.

What You'll Do:

- Build and scale production-grade backend systems
- Implement end-to-end features
- Make pragmatic technical decisions balancing innovation with reliability
- Collaborate with product and business stakeholders
- Ship reliable software that performs at scale

Technical Skills:

Backend

- Strong Python expertise: async programming, API development, real-time ASGI (Django/Channels)
- Testing, logging, monitoring, performance optimization
- Data storage (SQL and NoSQL) and async message queues (Celery + RabbitMQ / Redis)
- High-throughput, low-latency systems
- Production-grade application development

Full-Stack & DevOps
- JavaScript frameworks (React preferred)
- CI/CD pipelines and cloud platforms
- Deploying and scaling systems in production

AI (working knowledge, willingness to go deeper)
- Basic understanding of LLMs: prompt engineering, RAG, function calling
- Familiarity with agentic patterns and orchestration
- Awareness of LLM cost, guardrails, and evaluation




- Exposure to conversational/voice AI (STT/TTS, telephony) a plus

What Success:

- Core backend and agentic systems run reliably in production at enterprise scale
- AI workflows meaningfully reduce operational friction for customer teams
- The platform compounds: new deployments get faster and more robust over time
- Technical foundations support autonomy, observability, and safe decision-making
- Engineering velocity stays high without sacrificing reliability

Culture: We optimize for impact, speed, and ownership — not comfort. We operate as one team, with a flat structure and extreme ownership. We ship fast, learn from production, and challenge each other directly because we care about building something that lasts. Titles matter less than outcomes. Customers come first. Momentum matters.

About Joppy

Joppy es una plataforma de reclutamiento tecnológico construida para developers por developers.

✅ No se requiere CV. Solo di lo que sabes y lo que quieres.

✅ Perfil anónimo por defecto.

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Echa un ojo a las oportunidades de empleo tecnológico de forma anónima y encuentra el trabajo que te haga feliz.

📌 Software Engineer – AI Product (Madrid)
🏢 Joppy
📍 Madrid