Backend Engineer (Python / FastAPI / SQL)

pMarvelX builds specialized AI agents for complex and highly regulated domains such as insurance claims, compliance, and enterprise support. Our systems are designed to work in real world environments where accuracy, reliability, and clarity matter. The market is enormous and we are growing quickly. /pbrDe volledige functieomschrijving omvat alle bijbehorende vaardigheden, eerdere ervaring en eventuele kwalificaties die van sollicitanten worden verwacht.brpWe are searching for a Backend Engineer who enjoys working close to the data and creating systems that are fast, stable, and thoughtfully structured. You understand how to design services that move and transform data cleanly, and you care about readability as much as performance. /pbrpIn this role you will collaborate directly with the founders and engineering leads to shape the core APIs and data pipelines that power our platform. If you like solving intricate problems and building tools others rely on every day, this is a strong fit. /pbrpThis is not a maintenance role. It is an opportunity to help shape a product at an early and meaningful stage. If that sounds exciting, we would love to talk. /pbrMissionbrpAs Backend Engineer, you will design and build the foundational services behind MarvelX. This includes clean API design, efficient data access layers, and search capabilities that scale. You will work with SQL and Elasticsearch at significant volume, use Python and FastAPI to structure services, and ensure our AI systems have the right data with low latency and high reliability. /pbrWhat you will work onbrullibr/liliDesign and build backend services and APIs using Python and FastAPIbr/liliCreate and optimize database models and queries in PostgreSQL and other relational systemsbr/liliImplement and tune search and analytics capabilities with Elasticsearchbr/liliDesign data access layers and caching strategies that maintain performance at scalebr/liliCollaborate with frontend and AI engineering teams to define clean and intuitive API contractsbr/liliWrite clear, testable code with strong reliability and observability practicesbr/liliContribute to internal tooling and pipelines that support our data driven productsbr/li /ulbrWhat you bringbrullibr/liliTwo to four years of experience building production backend systemsbr/liliStrong Python skills (FastAPI preferred, experience in Flask or Django is also welcome)br/liliDeep understanding of SQL including xgiwjmb schema design, query tuning, and transactionsbr/liliExperience with Elasticsearch including mappings and performance tuningbr/liliAbility to design reliable and well structured REST APIsbr/liliFamiliarity with authentication, permissions, and structured data handlingbr/liliStrength in debugging, testing, and optimizing performancebr/liliExperience with async Python, caching layers, or message queuesbr/liliUnderstanding of data engineering or ETL workflowsbr/liliFamiliarity with Docker and deployment pipelinesbr/liliPrevious startup experience and comfort working in fast moving environmentsbr/li /ulbrpIf you are excited by building real systems that power AI in production, we would love to meet you. /pbr