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.
- Department
- Software Engineering
- Locations
- Warsaw, Bucharest, Lisbon
- Remote status
- Fully Remote
About Crystal Intelligence
Crystal 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.