About Longtail

Longtail is building an intelligent decision-streaming platform that helps
airlines make smarter, faster commercial decisions in real time. Combining
automation, proprietary algorithms, AI, and live data, our technology helps
airlines optimize pricing, availability, and product flexibility across
thousands of routes worldwide.

We're a fast-growing, international team solving complex, real-world problems at
scale.

The Role

You'll help build and evolve Sightline, Longtail's conversational analytics and
intelligent alerting product, as it moves from beta to a scalable,
production-ready platform.

This is a backend-focused full-stack role. You'll own features end to end:
understanding customer problems, designing solutions, building and deploying
them, and supporting them in production.

A key challenge on this team is building AI-native software customers can trust:
turning customer intent into secure, observable, explainable, and repeatable
production workflows.

We're looking for someone with 7+ years of backend/full-stack engineering
experience,



including time spent operating production systems, not just shipping
them.

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What You'll Do

* Design and build backend services, APIs, and customer-facing capabilities
across Sightline's product and platform; including conversational analytics,
intelligent alerting, reports and saved analyses, and AI-powered/agentic
workflows

* Own features end to end, from customer problem through to production

* Build reliable, asynchronous workflows with orchestration, error handling,
recovery, and observability baked in

* Integrate with data, analytics, and AI model platforms

* Design resilient systems that handle failures gracefully

* Contribute to the React frontend when a feature calls for it

* Improve testing, observability, security, and performance across the platform

* Make pragmatic technical decisions as the product evolves, and help shape
engineering standards and architecture as we grow

Our Tech

📌 Senior Full-Stack Product Engineer (Barcelona)
🏢 Longtail Technologies
📍 Barcelona