Barcelona, Catalonia, Spain · Hybrid
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, …
Skills: Java, Spring Boot, Python, FastAPI, React
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You will design and build backend services, APIs, and customer-facing capabilities for the Sightline platform while owning features from conception to production. You will also integrate AI-powered workflows and ensure system reliability, observability, and security across the platform.
The role requires 7+ years of backend or full-stack engineering experience with a strong background in operating production SaaS systems. Candidates must possess deep expertise in API development, database management, and distributed systems, along with the ability to turn ambiguous problems into technical solutions.
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.
\nWhat 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 Stack
Backend: Java, Spring Boot, Python, FastAPI, MCP
Frontend: React, Vite, Zustand, Vitest, Nginx
AI & Data: Anthropic, OpenAI, OpenRouter, Databricks, PostgreSQL, Amazon Aurora
Infrastructure: AWS, Kubernetes, Docker, Terraform, Kong, Keycloak, OpenTelemetry, New Relic
What We're Looking For
You're a strong backend engineer who:
Has built and operated production SaaS products
Is comfortable contributing across the stack
Has strong API, database, and SQL skills
Understands distributed systems, asynchronous processing, and failure modes
Cares about reliability, observability, security, and maintainability
Enjoys owning features end to end and takes ownership of software beyond deployment
Can turn ambiguous customer problems into pragmatic technical solutions
Uses AI-assisted development tools such as Claude Code, OpenAI Codex, or similar, while applying strong engineering judgement
Nice to have: experience with AI-native products, LLM applications, agents, or workflow orchestration; and/or experience in analytics, enterprise SaaS, pricing, travel, or aviation. Experience building AI agents is a plus, but strong engineering fundamentals matter more.
What Success Looks Like
Within your first few months, you'll:
Ship a meaningful customer-facing capability
Take ownership of a defined area of Sightline
Improve the reliability or observability of an existing workflow
Build a strong understanding of our architecture and customer needs
Working at Longtail
We're a collaborative, distributed team that values transparency, ownership, clear communication, and sustainable ways of working. You'll have the autonomy to make meaningful technical decisions, the context to understand why your work matters, and the responsibility to see what you build succeed in production.
We're committed to building a respectful and inclusive workplace where people can do their best work.
Compensation & Benefits
Competitive Package with base + bonus + equity + Benefits (Private health insurance and Pension contribution, Learning and Development budget, Childcare, transport and meal vouchers…).
Interview Process
Intro call → Coding interview → System Design → AI-Assisted Coding Exercise → Behavioural interview → Offer.
Ready to Build Something That Matters?
If you want to build AI-powered products that turn complex airline data into better commercial decisions — and solve the engineering challenges required to make AI reliable at enterprise scale — we'd love to meet you.
Longtail is an airline-industry first. An intelligent, autonomous pricing platform that increases an airline's revenue by growing their network footprint. It makes more journeys available at the right price for every customer search. Better still, it’s fully dynamic, staying up to date with the one billion price changes and the 150,000 schedule changes that the airline industry makes every day - so they're never out of step. All of this with no day-to-day human intervention.
Offices: Palo Alto, California, US · New York, New York, US · Toronto, Ontario, CA · Barcelona, Calalunya, ES
Longtail is an airline-industry first. An intelligent, autonomous pricing platform that increases an airline's revenue by growing their network footprint. It makes more journeys available at the right price for every customer search. Better still, it’s fully dynamic, staying up to date with the one billion price changes and the 150,000 schedule changes that the airline industry makes every day - so they're never out of step. All of this with no day-to-day human intervention.
Offices: Palo Alto, California, US · New York, New York, US · Toronto, Ontario, CA · Barcelona, Calalunya, ES
