Senior Software Engineer Backend at Wellhub

Senior Software Engineer Backend | BASE. We are hiring a Senior Software Engineer to join our BASE Focus Area (Tagus team) in Brazil. The Tagus team builds the heart of the Wellhub business model, helping to support millions of users, clients, and partners worldwide with a highly available, scalable platform. Challenges include building flexible systems for varied commercial conditions, managing critical flows such as client and user subscriptions, and providing accurate data across the ecosystem. Responsibilities involve developing critical services, designing and improving performance, scalability, and resilience, integrating 3rd‑party APIs, supporting existing systems, and working in a collaborative agile environment. The role also requires experience in large‑scale multi‑tier architecture, modern web application development, cloud (AWS/GCP), RESTful services, SQL/NoSQL databases (PostgreSQL, MySQL, DynamoDB), programming languages (Java, Kotlin, Go, Ruby, C++), and applying computer science fundamentals. Strong communication in English is required.