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Posted June 08, 2026
Crystal Intelligence

Senior Python Engineer (DevEx Team, Remote)

Crystal Intelligence
Warsaw, Poland Remote Full Time

Position Summary:

We are looking for a talented Senior Python Engineer to join our Platform & Developer Experience team. This is a fully remote role, and we welcome applications from anywhere in Europe. As part of our Build squad, you will play a critical role in shaping the foundations of developer experience, scalability, and performance of the Crystal platform.

More details: crystalintelligence.com

Duties and responsibilities:

  • Performance improvements, database query optimisation, and scalability enhancements;
  • Monitoring and observability configuration and best practices;
  • Managing and developing internal libraries;
  • Development pipeline improvements, like code coverage tooling integration, in close collaboration with the DevOps team;
  • Maintaining code to high-quality standards;
  • End-to-end feature design and implementation;
  • Coding, debugging, testing and delivering features and improvements in a continuous manner;
  • Providing code reviews, assistance and constructive feedback to other team members;
  • Refactoring code as necessary.


Required:

  • 8+ years of commercial experience developing Python backend services and APIs for the web;
  • Solid software architecture skills;
  • Experience with distributed systems;
  • Strong knowledge of SQL/NoSQL databases and data architecture, including PostgreSQL;
  • Experience with the Flask framework;
  • Experience in performance optimisation (database query optimisation, caching);
  • Understanding of integration processes with external services;
  • Product-oriented mindset;
  • Proficiency in English.


Would be a plus:

  • Experience with ClickHouse;
  • Experience with systems operating on large data volumes;
  • Experience designing AI-enabled developer environments;
  • Experience writing raw SQL queries;
  • Experience designing and leading major reworks of complex distributed systems;
  • Experience with Rust;
  • Passion for Bitcoin and blockchain technologies.


No previous knowledge of Blockchain technology required.

Tech stack:

  • Redis, RabbitMQ, PostgreSQL, ClickHouse;
  • Kubernetes, AWS S3;
  • Python 3.14, Flask, Granian;
  • Datadog, Grafana.


You’ll get:

  • AI tool of your choice: Cursor or Claude Code.