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Senior Python Engineer at Crystal Blockchain B.V. – Warsaw | Jobyssey

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Senior Python Engineer

Senior Python Engineer

Crystal Blockchain B.V. · Warsaw, Bucharest, Lisbon · 4 months ago

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Work mode: Remote
Seniority: Senior
Category: Software engineering
Experience: 8+ years
Company size: 51-200

ai api claude-code developer-experience devops distributed-systems flask nosql observability

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You will join our Platform and Developer Experience team as a Senior Python Engineer. This is a fully remote role across Europe. You will shape the developer experience on the Crystal platform by designing and implementing backend services, optimizing performance and scalability, and collaborating with the DevOps team to deliver high quality features. You will maintain code, participate in end to end feature design, and implement robust solutions while focusing on quality and reliability.

Responsibilities

Improve performance, scalability, and database query optimisation
Monitor observability configuration and best practices
Develop and maintain internal libraries
Enhance the development pipeline with tooling integration in collaboration with the DevOps team
Maintain high quality code
End to end feature design and implementation
Code, debug, test and deliver features and improvements in a continuous manner
Provide code reviews, assistance and constructive feedback to other team members
Refactor code as necessary

Requirements

8+ years of commercial experience developing Python backend services and APIs for the web
Solid software architecture skills
Experience with distributed systems
Strong knowledge of SQL NoSQL databases and data architecture including PostgreSQL
Experience with the Flask framework
Experience in performance optimisation (database query optimisation, caching)
Understanding of integration processes with external services
Product oriented mindset
Proficiency in English

Benefits

AI tool of your choice: Cursor or Claude Code