At **belo** we are looking for a **Backend Developer Senior** to join our team. We create simple financial products so that people can focus on what really matters to them. Our company is built by industry experts and passionate entrepreneurs who are convinced that, in order to create and preserve value for both current and future generations, it is crucial that everyone around the world has access to the best and simplest financial services. Our core services are built using **Node.js, TypeScript, PostgreSQL, and MongoDB on top of AWS.** We need resourceful engineers to take the platform to the next level. If you like new challenges and you're looking to get into a new and thriving industry, this is a great chance to join a top\-tier team of passionate people. ### **What You'll Do** * Write clean, well\-documented, and maintainable code in TypeScript, conducting code reviews, refactoring code, and implementing testing frameworks to ensure reliability and efficiency * Build scalable and secure APIs to facilitate data communication between the front\-end and back\-end systems * Design architectures that meet security standards to protect user data, focusing on data encryption, authentication, and authorization * Design, manage, and optimize database schemas to ensure efficient data storage and retrieval. Handle complex queries and database indexing to maintain performance under heavy load * Work with various third\-party APIs and services for financial functions, like payment processing, identity verification, and analytics, ensuring secure and reliable integrations * Monitor and optimize server performance for high\-volume transactions, using techniques such as caching, load balancing, and microservices architecture. * Work closely with front\-end developers to design efficient data flows and DevOps to streamline deployment, CI/CD, and scalability, ensuring continuous and stable performance of the fintech app ### **What We're Looking For** ##### **Must have:** * TypeScript * Git * PostgreSQL * MongoDB * RESTful APIs * Jest * English proficiency ##### **Nice to have:** * React * Docker * AWS * Shell scripting * Experience with crypto * Portuguese proficiency * NestJs ### **What We Offer** * The opportunity to build and own the security foundation of a fast\-growing fintech platform * A passionate team focused on innovation, transparency, and impact * Competitive compensation in USDT * Six weeks of vacation * Flexible hours * A MacBook and an annual budget to invest in your professional development * Mostly remote, with at least one day a week at our Buenos Aires office * A vibrant startup culture with flexibility, autonomy, and a results\-oriented approach At **belo**, we're redefining financial services for LatAm and beyond. Join us to protect the tools people need to thrive in the modern economy.