Location : mexico-monterreyjob type : contractor - onsite monday to friday profile: backend developer (knowledge of .net migrations) the objective of this position is to execute the technological transition of legacy applications developed in .net framework 4.0 towards a modern architecture based on .net 8, ensuring data integrity, system security and scalability through microservices. Key responsibilities: application modernization: refactoring and migrating legacy code to .net 8 using best practices and design patterns. Architecture design: implementing and optimizing ecosystems based on microservices. Data management: optimize queries and schemas in sql server to ensure optimal performance post-migration. Security: implement bank/enterprise grade security standards (oauth2, openid connect, data encryption, etc.). Automation: collaborating with the development lifecycle through ci/cd in devops environments. Technical requirements (must-have): solid experience: minimum 5-6 years in backend development. .net proficiency: proven experience migrating projects from older versions (4.0/4.5) to .net core or .net 8. Databases: advanced sql server (stored procedures, tuning, relational design). Microservices: real-world experience working with containers (docker), api gateways, and asynchronous communication. Devops: fluent use of azure devops, jenkins or github actions. ### desirable: experience in the financial sector or handling of sensitive data.