Backend Engineer (Python / FastAPI / SQL)

MarvelX AI builds specialized AI agents for complex regulated domains. They are hiring a Backend Engineer to design and build core APIs and data pipelines using Python, FastAPI, and SQL.

• Design and build backend services and APIs using Python and FastAPI
• Create and optimize database models and queries in PostgreSQL and other relational systems
• Implement and tune search and analytics capabilities with Elasticsearch
• Design data access layers and caching strategies that maintain performance at scale
• Collaborate with frontend and AI engineering teams to define clean and intuitive API contracts
• Write clear, testable code with strong reliability and observability practices
• Contribute to internal tooling and pipelines that support our data driven products

• Two to four years of experience building production backend systems
• Strong Python skills (FastAPI preferred, experience in Flask or Django is also welcome)
• Deep understanding of SQL including schema design, query tuning, and transactions
• Experience with Elasticsearch including mappings and performance tuning
• Ability to design reliable and well structured REST APIs
• Familiarity with authentication, permissions, and structured data handling
• Strength in debugging, testing, and optimizing performance