Location : mexico-monterreyjob type : contractor - onsite monday to fridayprofile: 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.