Full Stack Developer (Back-end focused)

About Caravelo At Caravelo , we are revolutionizing the travel industry with subscription-based solutions that help airlines and travel companies unlock new revenue streams while enhancing customer loyalty. Our SaaS platform enables seamless subscription management, dynamic pricing, and automation , helping airlines transition from traditional ticket sales to more sustainable, customer-centric models.

With a team of passionate innovators, engineers, and industry experts , we are building the future of travel technology. Headquartered in Barcelona , we operate globally, partnering with some of the world’s leading airlines to drive digital transformation and create frictionless, modern travel experiences .

The mission We're looking for a Full Stack Developer who is analytical, results-driven, and grounded in Java backend development. Your center of gravity will be the backend: designing, building and maintaining the robust, scalable systems that power our SaaS platform in a high-transaction fintech and traveltech environment. That said, this isn't a purely backend role. You don't need to be a frontend expert, but you need to be sharp enough to pick up a ticket that touches the UI, lean on AI to vibe-code your way through the Vue side of it, and get it done properly rather than handing it off. Most of your work will be backend; some of it won't be, and you should be able to move between the two without friction. What you ll do Architecture and APIs

• Design, develop and maintain scalable backend systems using Java
• Build and evolve public and internal APIs, applying best practices in API security and data handling to meet stringent compliance requirements
• Apply Hexagonal Architecture principles to keep systems modular, maintainable and testable

Data and performance

• Work across relational and non-relational databases, including Couchbase, to design efficient, high-availability data models and queries for high-transaction workloads
• Proactively identify and resolve performance bottlenecks, using observability tools like Datadog to monitor system performance

Quality and reliability

• Ensure high-quality code through rigorous unit, integration and automated testing, and lead by example in code reviews
• Implement observability practices (metrics, logging, tracing) to monitor system health and catch issues before they become incidents
• Proactively identify technical debt and drive the improvements needed to keep the codebase clean

Frontend collaboration

• Pick up frontend work in Vue.js when a feature calls for it, leaning on AI to vibe-code the UI side and working end-to-end rather than only on the backend half of a ticket
• Collaborate with the frontend team to keep the product consistent across the stack

AI-assisted engineering

• Use AI coding assistants (Claude Code, GitHub Copilot and similar) as part of your daily workflow in implementation, testing, debugging and documentation
• Apply Spec-Driven Development: write clear specs up front and use them to guide and validate AI-assisted implementation, so AI-generated code stays reliable and maintainable

Documentation and collaboration

• Create and maintain technical documentation that supports backend operations and team collaboration
• Work across disciplines to keep the product consistent and the customer experience solid

What you bring Must have:

• Extensive experience in Java backend development, with a solid understanding of the broader product development process
• A track record designing and implementing large-scale backend solutions in cloud environments, particularly AWS
• Sharp enough with frontend concepts (Vue.js) to use AI to build or modify a UI feature and know if what comes out is right. You don't need to be a Vue expert, but you can't be lost in it either
• Strong experience building RESTful APIs and microservices architectures
• Proficiency with both relational and non-relational databases (e.g., Couchbase)
• Expertise in automated testing (unit, integration, E2E), TDD, and CI/CD pipelines
• A solid grasp of observability tools and practices (e.g., Datadog): metrics, logs, traces
• Familiarity with build automation tools (Maven, Gradle) and Git-based workflows, including branching, merging and code review
• Strong debugging and troubleshooting skills, including with asynchronous callbacks, multi-threaded environments and parallel computing Hands-on daily use of AI coding assistants — writing prompts, reviewing AI-generated code, and using them to speed up real work
• An analytical mindset, good time management, and a genuine curiosity about new technologies
• Bachelor's degree in Computer Science, Software Engineering or a related field

Good to have:

• Experience with Nuxt, beyond core Vue
• Advanced performance tuning, caching and resource management, including Couchbase indexing and query optimization
• Experience in security, compliance or enterprise SaaS environments
• Ability to mentor other engineers, run code reviews, and facilitate technical workshops

What we offer

• Competitive salary structure with a clear progression framework.
• Tax-free benefits: private health insurance, restaurant and transport cards, and kindergarten subsidies.
• Flexible working hours and locations for a healthy work-life balance.
• Hybrid work model with a vibrant Barcelona office.
• Generous budget for training and conferences.
• Regular company events and celebrations.
• 23 days holiday.