Senior Python Engineer (Remote)

We are looking for a talented Senior Python Engineer to join our team responsible for transaction monitoring and exploration. This is a fully remote role, and we welcome applications from anywhere in Europe. As part of our Nexus squad, you will play a critical role in streamlining clients’ operations and smoothing their investigations on the Crystal platform.

More details: crystalintelligence.com

Duties and responsibilities

• Owning the transaction monitoring part of the Crystal platform;
• Improving stability and observability of the owned services;
• 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;
• Performance optimizations (including database queries optimizations);
• Refactoring code as necessary.

Required

• 8+ years of commercial experience developing Python backend services and APIs for the web;
• Solid software architecture skills;
• Strong knowledge of SQL/NoSQL databases and data architecture, including PostgreSQL;
• Knowledge of testing principles at different levels of the system;
• Experience in developing client-facing solutions;
• Experience with distributed systems;
• Product-oriented mindset;
• Proficiency in English.

Would be a plus

• Experience with scalability and performance optimizations of large distributed systems.
• Experience with systems operating on large data volumes;
• Experience with the Flask framework;
• Passion for cryptocurrencies and blockchain technologies.

No previous knowledge of Blockchain technology required.

Tech stack

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

You’ll get

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