Senior Product Engineer

Longtail Technologies; Barcelona; Presencial; EUR 90.000 - 130.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Private health insurance

Pension contribution

Learning and Development budget

Childcare

Transport vouchers

Meal vouchers

Descripción de la vacante

Longtail Technologies is seeking a Senior Product Engineer: Full-stack with 80% backend and 20% frontend to build and evolve our conversational analytics and intelligent alerting platform. You will own features end to end, from customer problem to production, and work on AI-native software customers can trust.

The role demands 7+ years of engineering experience, production SaaS expertise, and strong API, database, and SQL skills.

Formación

• 7+ years of engineering experience in production systems, not just shipping code.
• Experience building and operating production SaaS products.
• Strong API, database, and SQL skills.
• Understanding of distributed systems, asynchronous processing, and failure modes.
• Focus on reliability, observability, security, and maintainability.
• Experience using AI-assisted development tools (Claude Code, OpenAI Codex) with strong engineering judgement.

Responsabilidades

• Design and build backend services, APIs, and customer-facing features, including conversational analytics and intelligent alerting.
• Own features end-to-end from problem to production.
• Develop reliable, asynchronous workflows with orchestration, error handling, and observability built in.
• Integrate with data, analytics, and AI model platforms.
• Design resilient systems that handle failures gracefully.
• Contribute to the React frontend when needed for a feature.
• Improve testing, observability, security, and performance across the platform.
• Shape engineering standards and architecture as the product grows.

Conocimientos

Backend development

APIs

SQL

Distributed systems

Observability

Security

Reliability

AI tools

Herramientas

Claude Code

OpenAI Codex

Descripción del empleo

Senior Product Engineer: Full-stack with 80% Backend

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 our new conversational analytics and intelligent alerting product, as it moves from beta to a scalable, production-ready platform.

This is a full-stack role with roughly 80% backend, 20% frontend. 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.

We’re looking for someone with 7+ years of engineering experience, including time spent operating production systems, not just shipping them.

What You’ll Do

• Design and build backend services, APIs, and customer-facing capabilities: 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

What We’re Looking For

You're a strong backend engineer who:

• Has built and operated production SaaS products
• Has strong API, database, and SQL skills
• Understands distributed systems, asynchronous processing, and failure modes
• Cares about reliability, observability, security, and maintainability
• Uses AI-assisted development tools such as Claude Code, OpenAI Codex, or similar, while applying strong engineering judgement

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. We’re committed to building a respectful and inclusive workplace where people can do their best work.

• Competitive Package with base + bonus + equity + Benefits (Private health insurance and Pension contribution, Learning and Development budget, Childcare, transport and meal vouchers…).