One of the fastest-growing AI-native startups that collaborates with Joppy is looking for a Senior Backend/Full-Stack Engineer (primarily backend) 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:

- Testing, logging, monitoring, performance optimization
- Data storage (SQL and NoSQL) and async message queues (Celery + RabbitMQ / Redis)
- High-throughput, low-latency systems

Full-Stack & DevOps

- 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 ope

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