XCAInternational is a leading company in the information technology sector, with a strong market presence and a dynamic, collaborative work environment. Our focus on innovation and technological development has enabled us to establish ourselves as industry benchmarks. We offer our employees opportunities for professional growth and skill development within a stimulating and continuously evolving environment. Location: Mexico City. We are seeking a **Back End Developer with AWS experience** to build microservices supporting linkage, delinkage, and data query logic, integrating multiple external data sources and handling massive volumes of data. You will work with AWS services (API Gateway, Lambda, RDS/DynamoDB, S3) in a high-security environment featuring end-to-end encryption and 24x7 operations. **Key requirements:** +4 years in back-end development, +2 years with AWS, proficiency in Java/Node.js/Python, API design experience, and experience with highly available and auditable systems. Position type: Full-time, Project-based or fixed-term contract Contract duration: 6 months Salary: Up to $40,000.00 per month Education: * Completed bachelor’s degree (Mandatory) Experience: * Development: 1 year (Mandatory) Language: * English (Desirable)