Senior Python Engineer (Remote)

Position Summary:

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.