ppstrongWant to put your job search on autopilot? Join our platform, complete a 6-minute AI screening interview, and get auto-applied to 100s of high-paying roles. /strong /ppstrongSign up now at and let the opportunities come to you. /strong /ph3The Role /h3pWe are seeking an experienced Backend Engineer who is excited to build the technical backbone of a new generation travel platform. You’ll work with Java and Spring Boot to design and implement scalable, resilient backend services, and use databases like MySQL, MongoDB, and ElasticSearch to power search, personalization, and booking flows. Familiarity with Linux systems, AWS, and microservices architecture will help you ship reliable systems at scale. /ph3Core Responsibilities /h3ulliDesign, develop, and scale backend systems using Java and Spring Boot. /liliCreate low-latency search infrastructure (ElasticSearch, caching, query optimization). /liliBuild and maintain supplier integrations across hotels, chains, and experiences, ensuring stability and fault tolerance. /liliImplement real-time personalization and ranking logic to improve customer discovery and booking conversion. /liliEnable AI-powered experiences by building APIs, data pipelines, and scalable systems that support recommendations, personalization, and conversational interfaces. /liliDevelop and maintain database schemas, queries, and stored procedures (MySQL, MongoDB, ElasticSearch). /liliDeploy and optimize services on Linux and AWS environments (EC2, S3, RDS, Lambda, API Gateway). /liliImplement and evolve microservices architecture; design APIs for communication between services. /liliMonitor backend systems in production, troubleshoot issues,



and deliver timely fixes. /liliCollaborate with product, growth, and engineering peers to translate customer needs into backend solutions. /liliParticipate in code reviews, debugging, and documentation to ensure quality and maintainability. /liliStay current with new backend and AI technologies, bringing forward ideas for innovation and scale. /li /ulh3Candidate Requirements /h3ulliBachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field. /lili2–5 years of backend development experience with Java and Spring Boot. /liliStrong knowledge of relational and NoSQL databases (MySQL, MongoDB) and ability to design efficient schemas, queries, and stored procedures. /liliFamiliarity with ElasticSearch and interest in building low-latency search systems. /liliHands-on experience with Linux systems and deploying/maintaining backend services in production. /liliExperience with AWS services (EC2, S3, RDS, Lambda, API Gateway) and cloud-native deployments. /liliUnderstanding of microservices architecture and proven experience designing and implementing APIs for service communication. /liliStrong problem-solving and analytical skills with a focus on scalability, reliability, and performance. /liliExcitement to work in an AI-first company, building systems that power personalization, recommendations, and AI-driven experiences at scale. /liliExcellent communication skills and the ability to collaborate effectively across product, growth, and engineering teams. /li /ulpstrongDisclaimer: Calyptus uses an automated assessment tool that scores applicants. /strong /p /p #J-18808-Ljbffr

📌 Backend Engineer (España)
🏢 Calyptus
📍 España