Senior Python Engineer (DevEx Team, Remote)

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.