Senior Full Stack Engineer (.NET Core 8 / React)

**Join Our Team** Oowlish, one of Latin America's rapidly expanding software development companies, is seeking experienced technology professionals to enhance our diverse and vibrant team. As a valued member of Oowlish, you will collaborate with premier clients from the United States and Europe, contributing to pioneering digital solutions. Our commitment to creating a nurturing work environment is recognized by our certification as a Great Place to Work, where you will have opportunities for professional development, growth, and a chance to make a significant international impact. We offer the convenience of remote work, allowing you to craft a work\-life balance that suits your personal and professional needs. We're looking for candidates who are passionate about technology, proficient in English, and excited to engage in remote collaboration for a worldwide presence. **About the Role:** We are looking for a **Full Stack Developer with a strong Back\-End focus** to support the evolution of a large\-scale SaaS ecosystem that powers cultural, educational, and streaming platforms. This role is centered on **modernizing and scaling a mature, long\-lived codebase** , ensuring performance, reliability, and interoperability across multiple devices and platforms. You will work within a **complex, multi\-tenant environment** that supports web, mobile, and Smart TV experiences, contributing to the gradual transition from legacy technologies to a modern, scalable architecture. This is a **hands\-on technical role** , ideal for someone who enjoys solving real\-world problems in systems that are actively used by thousands of users. We are seeking a strong individual contributor who is comfortable navigating legacy systems while building forward\-looking solutions. **Back\-End (Primary Focus)** * Develop, maintain, and evolve REST APIs using .NET Core 8 * Work with Entity Framework and background workers * Maintain and improve legacy .NET Framework codebases * Optimize SQL Server (Azure) performance and queries * Implement and manage caching strategies (Redis) **Front\-End (Support Role)** * Maintain existing JavaScript and jQuery code * Contribute to new features using React * Support applications built with WebForms, MVC, and Classic ASP **Infrastructure \& Platform Support** * Work with Azure cloud services * Maintain and improve CI/CD pipelines * Support a multi\-platform, multi\-tenant (white\-label) SaaS environment **Must\-Have:** * Strong experience with .NET Core 8 and modern .NET technologies * Hands\-on experience working with legacy .NET Framework systems * Strong knowledge of SQL Server * Experience with Entity Framework * Experience implementing Redis caching * Proficiency with JavaScript and jQuery * Experience with React * Experience working in Azure environments and CI/CD pipelines **Nice to Have:** * Experience working with long\-evolving legacy systems * Exposure to multi\-tenant or white\-label SaaS architectures * Performance and scalability optimization in complex systems * Experience with content, media, or streaming platforms * Background in B2B or B2G SaaS environments **Benefits \& Perks:** Home office; Competitive compensation based on experience; Career plans to allow for extensive growth in the company; International Projects; Oowlish English Program (Technical and Conversational); Oowlish Fitness with Total Pass; Games and Competitions; **You can also apply here:** Website: https://www.oowlish.com/work\-with\-us/ LinkedIn: https://www.linkedin.com/company/oowlish/jobs/ Instagram: https://www.instagram.com/oowlishtechnology/ We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.