Senior Python Engineer (DevEx Team, Remote)

Role 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.

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.

You’ll get

AI tool of your choice: Cursor or Claude Code.

Requirements

• 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.