Backend Engineer (Python / FastAPI / SQL)

MarvelX 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.

De volledige functieomschrijving omvat alle bijbehorende vaardigheden, eerdere ervaring en eventuele kwalificaties die van sollicitanten worden verwacht.
We 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.

In 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.

This 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.

Mission
As 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.

What you will work on

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• 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

What you bring

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• 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 xgiwjmb 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

• Experience with async Python, caching layers, or message queues

• Understanding of data engineering or ETL workflows

• Familiarity with Docker and deployment pipelines

• Previous startup experience and comfort working in fast moving environments

If you are excited by building real systems that power AI in production, we would love to meet you.