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.