Customer Solutions Engineer (Java / Full Stack)

Airlines have spent decades selling one trip at a time. At Caravelo, we help them build recurring relationships with their customers instead.

We build the technology behind airline subscription products used by carriers around the world, combining SaaS, payments, booking systems and airline integrations in one platform.

Our Product & Platform teams build the common technology. Our Professional Services team makes it work in the real world for each airline.

That is where this role comes in.

Caravelo has one platform, but no two airline implementations are exactly the same.

As a Customer Solutions Engineer in our Professional Services team, your job is to bridge that gap.

You will learn how our core platform can be configured, integrated and extended, and use those capabilities to create the implementation each customer needs... without modifying or forking the core platform!

For every airline, we build a customer plugin that wraps the specific integrations, extensions, business rules and behaviours required to make Caravelo fit naturally into that customer's technology landscape.

Working closely with Project Managers and customer stakeholders, you will understand requirements, identify the peculiarities of each implementation and decide how best to solve them: configuration, extension, integration or, when justified, a dedicated service or module.

The goal is simple: Make every customer rollout feel unique while keeping it cleanly built on top of a common, scalable platform.

• Understand customer requirements together with the Project Manager.
• Translate business and technical requirements into a concrete implementation.
• Configure and extend the Caravelo platform using the capabilities provided by our Product & Platform teams.
• Build and maintain the customer plugin that contains customer-specific logic and integrations.
• Take implementations through development, testing, launch and production stabilisation.

• Airline reservation and passenger service systems.
• Payment gateways and payment infrastructure.
• Identity and authentication platforms.
• CRM and communication systems.
• Loyalty platforms.
• Data platforms.
• Internal airline APIs.
• Third-party and legacy systems.

• Build an additional connector.
• Extend an existing workflow.
• Create customer-specific business logic.
• Develop an isolated service or module.
• Implement data transformation or migration processes.

• Investigate and debug production issues.
• Maintain customer-specific integrations.
• Upgrade connectors as external systems evolve.
• Support customers through technical migrations.
• Replace or introduce integrations while keeping the service running.
• Improve existing implementations when better platform capabilities become available.

• Implementation.
• Exploring unfamiliar code.
• Writing and extending tests.
• Debugging.
• Refactoring.
• Documentation.
• Working with APIs and integrations.
• Accelerating occasional frontend work.

• You can take a customer requirement and turn it into a clean, production-ready solution.
• Customers launch successfully without unnecessary changes to the core platform.
• Customer-specific behaviour remains well isolated and maintainable.
• Integrations are observable, reliable and understandable by engineers other than their original author.
• You can diagnose complex problems across Caravelo and customer systems.
• You understand when to configure the platform, when to extend it and when custom development is genuinely necessary.
• You become increasingly independent in understanding new customer technology landscapes.
• Migrations and changes to existing integrations can be delivered without destabilising the customer's service.

• Strong professional experience building production software in Java, with solid backend engineering fundamentals.
• Experience designing and integrating APIs, distributed services and cloud-based systems.
• Strong debugging and problem-solving skills, especially when working across multiple systems or external dependencies.
• Good understanding of testing, CI/CD, databases, observability and production software quality.
• Comfortable understanding an existing platform and extending it cleanly rather than rebuilding from scratch.
• Strong communication skills and the ability to work with Project Managers, engineers and technical customer stakeholders.

• Experience in Professional Services, implementation engineering, solutions engineering or customer-facing technical delivery.
• Experience integrating enterprise or legacy systems, particularly in complex customer environments.
• Experience with payments, payment gateways, data migrations or other business-critical integrations.
• Experience in travel technology, airlines, reservation systems or similarly integration-heavy industries.
• Familiarity with the technologies listed in our stack, especially Vue/Nuxt, Couchbase or Datadog.
• Experience working in security, compliance or reliability-sensitive environments.

You do not need to arrive knowing every technology we use.

Some of the technologies you may encounter include: Java · SpringBoot · Vue.js · Nuxt · Couchbase · PostgreSQL · AWS · Datadog · Gitlab · Docker · Opentofu · Claude Code · Cursor

More important than matching every technology is your ability to understand unfamiliar systems, investigate how things work and build reliable solutions around them.

• Competitive salary with a clear progression framework.
• Flexible working hours.
• Barcelona-based hybrid model: 4 days in the office and 1 day working from home.
• Tax-efficient benefits including private health insurance, restaurant and transport cards, and kindergarten support.
• Budget for training and conferences.
• Regular company events and celebrations.
• 23 days of annual leave.
• Exposure to complex airline technology environments around the world.
• The opportunity to work across software engineering, integrations and real customer implementations.
• Meaningful ownership: you will see the systems you build go from requirements to production.

1. Intro call (15–20 min) - A short conversation with our People team to get to know you, understand what you’re looking for and introduce Caravelo and the role
2. Hiring Manager interview (30-45 min) - A deeper conversation about your experience, the role and the problems you would be solving in our Professional Services team.
3. Practical assessment (Take-home assignment) - A short, role-specific exercise designed to understand how you approach technical problems and real-world scenarios.
4. Team interview (45-60 min). Meet 2-3 future colleagues to discuss your experience and assignment, dive deeper into technical topics and explore how we would work together.
5. Founder interview (30-45 min). A final conversation with one of Caravelo’s founders to align on expectations, ways of working and any remaining questions.