GBBC Member Careers

Python Developer (Remote)

Crystal Blockchain

Crystal Blockchain

Software Engineering
Madrid, Spain
Posted on Thursday, November 9, 2023

Crystal is the world-leading all-in-one blockchain analytics tool for crypto AML compliance, providing blockchain analytics and crypto transaction monitoring for thousands of cryptos in real-time.

Designed for law enforcement and financial institutions, Crystal provides a comprehensive view of the public blockchain ecosystem and uses advanced analytics and data scraping to map suspicious transactions and related entities.

Whether it is tracking a bitcoin transaction to a real-world entity, determining relationships between known criminal actors, or surveying suspicious online behavior, Crystal can help move your investigation forward.

To learn more, visit:

Position Summary:

We are looking for a talented Mid to Sr Python Engineer to join our team.

More details:

Duties and responsibilities:

  • Choose technologies for backend development;
  • End-to-end feature designing and implementation;
  • Code, debug, test and deliver features and improvements in a continuous manner;
  • Provide code review, assistance and feedback for other team members;
  • Refactor code as necessary;


  • 4+ years commercial experience in developing backend services and API for Web or Mobile Apps;
  • Software architecture skills. Strong knowledge of Python programming language;
  • Experience in PostgreSQL database system;
  • Experience with a Flask framework;
  • Knowledge of Unit Testing principles;
  • Experience in developing service-oriented solutions;
  • Understanding of the process of integration with external services.

Would be a plus:

  • DevOps skills for working in development environment;
  • Practical experience in big data; Experience with NoSQL, key-value and other storages;
  • Passion for Bitcoin and Blockchain technologies;
  • Experience with distributed systems, like cryptocurrencies and blockchain technologies;
  • Experience of mentoring a team and leading a project;
  • Experience with open source solutions;