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.comDuties 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.About Crystal IntelligenceCrystal is a globally distributed team of world-class blockchain analysts, award-winning mathematicians, and professional software developers with headquarters in London and Amsterdam. We design an all-in-one blockchain analytics solution for regulators, financial services, and law enforcement. Our crypto transaction monitoring and risk assessment software enables financial institutions to comply with global anti-money laundering regulations. Law enforcement agencies and regulators use our technology and data to track the movement of cryptocurrencies in real-time to identify illicit fund flows and solve investigations. Our platform, Crystal Expert, is available as a free online blockchain explorer, as SaaS, or API.

Senior Python Engineer (Remote)

Emma

Responsibilities

Skills wanted:

Language(s) required:

About Crystal Intelligence:

crystalintelligence.com/

Admin access needed