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Senior Backend Developer at Freelance Latin America. We are seeking an experienced Senior Backend Developer to support a U.S.-based organization in building, maintaining, and optimizing scalable backend systems. This role is ideal for someone with strong database expertise, solid backend frameworks experience, and a proactive mindset focused on performance, security, and reliability.. Duties / Tasks to perform. Design, optimize, and maintain relational database structures, including indexing and query performance tuning . Develop and maintain backend services using Python and Django / Django REST Framework . Work with PostgreSQL databases to ensure data integrity and scalability . Implement logging and monitoring solutions using the ELK stack . Support containerized environments using Docker . Collaborate on cloud-based infrastructure with AWS (general working knowledge required) . Apply encryption and authentication best practices to ensure application security . Support asynchronous processing and background tasks (Redis, Celery – plus) . Contribute to real-time features using WebSockets (nice to have). Strong experience with SQL and relational database design . Advanced proficiency in Python . Hands-on experience with Django and Django REST Framework . Solid understanding of PostgreSQL . Experience with logging and monitoring tools (ELK stack) . Working knowledge of Docker-based environments . Familiarity with cloud infrastructure concepts (AWS) . Knowledge of encryption, authentication, and security best practices . Strong attention to detail and ability to meet deadlines . Professional proficiency in English; Spanish is a plus. Schedule: Monday to Friday, 6:00 AM – 2:00 PM (GMT -5, Eastern Time – US & Canada). Company Location: Colombia.