<h3>Position Summary:</h3><p>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.</p><p>More details: <a href="https://crystalintelligence.com" rel="nofollow ugc noopener noreferrer" target="_blank">crystalintelligence.com</a></p><h3>Duties and responsibilities:</h3><ul><li><p>Owning the transaction monitoring part of the Crystal platform;</p></li><li><p>Improving stability and observability of the owned services;</p></li><li><p>Maintaining code to high-quality standards;</p></li><li><p>End-to-end feature design and implementation;</p></li><li><p>Coding, debugging, testing and delivering features and improvements in a continuous manner;</p></li><li><p>Providing code reviews, assistance and constructive feedback to other team members;</p></li><li><p>Performance optimizations (including database queries optimizations);</p></li><li><h3>Refactoring code as necessary.</h3></li></ul><h3>Required:</h3><ul><li><p>8+ years of commercial experience developing Python backend services and APIs for the web;</p></li><li><h3>Solid software architecture skills;</h3></li><li><p>Strong knowledge of SQL/NoSQL databases and data architecture, including PostgreSQL;</p></li><li><p>Knowledge of testing principles at different levels of the system;</p></li><li><p>Experience in developing client-facing solutions;</p></li><li><h3>Experience with distributed systems;</h3></li><li><h3>Product-oriented mindset;</h3></li><li><h3>Proficiency in English.</h3></li></ul><h3>Would be a plus:</h3><ul><li><p>Experience with scalability and performance optimizations of large distributed systems.</p></li><li><p>Experience with systems operating on large data volumes;</p></li><li><h3>Experience with the Flask framework;</h3></li><li><p>Passion for cryptocurrencies and blockchain technologies.</p></li></ul><p><em>No previous knowledge of Blockchain technology required.</em><br><br><strong>Tech stack:</strong></p><div><ul><li><h3>Redis, RabbitMQ, PostgreSQL, ClickHouse;</h3></li><li><h3>Kubernetes, AWS + Hetzner;</h3></li><li><h3>Python 3.14, Flask, Granian;</h3></li><li><h3>Datadog, Grafana.</h3></li></ul><h3>You’ll get:</h3></div><div><ul><li><p>AI tool of your choice: Cursor or Claude Code.</p></li></ul></div><p>Originally posted on <a href="https://himalayas.app">Himalayas</a></p>