Senior Fullstack C# and React Engineer

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Fullstack C# and React Engineer based in Brazil. Join a fully remote engineering team building scalable B2B SaaS solutions for global clients in a fast-paced, cloud-native environment. In this hands-on role, you will own application and service development from architecture and implementation through testing and deployment. You’ll work primarily across C#/.NET and React, with a backend-leaning focus and approximately 70% hands-on development and 30% mentoring. Your work will involve microservices, APIs, event-driven architectures, cloud platforms, and modern infrastructure. You’ll collaborate across teams, influence technical decisions, and help deliver reliable, secure, and high-performing solutions. This is an opportunity to combine deep technical execution with leadership and meaningful impact.