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Principal/Senior Software Engineer (React.js.) - OP02041 at Dev.Pro. 🟢 We’re expanding our team and opening new remote opportunities! Review the role expectations, share your resume in English, and our team will follow up shortly.. We invite a talented and driven Senior Full-Stack Software Engineer with strong .NET and React.js skills to join our experienced, cross-functional Agile team. In this role, you’ll contribute to the modernization of a critical internal platform, transforming a complex legacy system into an efficient, scalable solution that offers improved performance and a better user experience. . 🟩. What's in it for you:. Work with a reputable S&P 500 fintech company. Modernize a critical platform with multiple dependencies, integrations, and complex logic . Join an experienced, international team using a modern tech stack (NET 6+, React.js, TypeScript, Next.js, Docker, GCP). ✅ Is that you?. 6+ years of experience with .NET 6+ and .NET Core development. 2+ years of experience with JavaScript (React.js, TypeScript). Proven experience developing APIs with .NET 6. Strong knowledge of SQL Server and stored procedures. Experience writing unit tests and producing testable code. Solid understanding of OOP principles and related concepts. Experience building n-tier enterprise applications. Strong technical judgment in selecting and applying languages, patterns, and libraries. Good knowledge of Scrum methodology. Excellent communication and teamwork skills. Ownership, accountability, and proactive problem-solving. Upper-Intermediate English level. Desirable:. Experience building AI/ML-powered frontend features. Familiarity with video encoding, FFmpeg, or annotation tools. Experience building internal tools for data/ML teams. Knowledge of Node.js or distributed systems. Experience working with Azure, Redis, or containerized environments. 🧩Key responsibilities and your contribution . In this role, you’ll help rewrite our legacy application to improve its performance and quality and introduce new features using a modern tech stack.. Develop and maintain high-quality code for new features and improvements. Participate in the release process to ensure smooth deployments. Collaborate with the team to refine the technical backlog. Conduct code reviews and provide constructive feedback. Work with the team to resolve technical challenges and implementation issues. Contribute ideas and suggestions to improve the overall application architecture. Our next steps:. ✅ Submit a CV in English — ✅ Intro call with a Recruiter — ✅ Internal interview — ✅ Client interview — ✅ Offer. Interested? Find out more:. 📋How we work. 💻 LinkedIn Page. 📈 Our website . 💻IG Page . Company Location: Brazil.