Lead Python Developer (Fintech)

We're looking to add a Lead Python Developer (Fintech) to our team—someone with solid technical expertise in building applications and managing deployment pipelines, particularly for large-scale systems and trading databases.

Please note that work hours extend to 8–9 PM.

Responsibilities

• Build data processing workflows leveraging Python while managing virtual environments
• Craft and fine-tune SQL queries designed for trading databases
• Work collaboratively through Git, covering branching, Pull Request creation, and code review processes
• Engage in CI/CD pipeline tasks, encompassing builds, testing, deployments, and rollbacks as necessary
• Examine large and intricate datasets, including loan-level tapes and model outputs
• Cross-check results originating from multiple sources and probe into any discrepancies found
• Document and clarify variances identified throughout data reconciliation work

Requirements

• A minimum of 7 years working as a Python Developer
• Strong command of Python, Pandas, and NumPy
• Adaptability in using conda, poetry, and uv for managing packages and virtual environments
• Expertise in crafting and refining SQL queries
• Experience handling large, unstructured datasets such as loan-level tapes and model outputs
• Ability to reconcile two sets of results and articulate the reasoning behind differences
• Hands-on experience with Git, including branching, Pull Requests, and code review practices
• English proficiency at a B2+ level or higher

Nice to have

• Familiarity with SQL Server/T-SQL
• Comfort working with Linux command line, SSH, and hybrid Windows/Linux file shares (SMB/NFS)
• Knowledge of how CI/CD pipelines operate, including builds, testing, deployment, and rollback procedures
• Foundational understanding of fixed income concepts: price/yield relationships, duration and convexity, spread types (OAS, Z spread), the distinction between coupon and yield, and accrued interest

Benefits

We gather like-minded people:

• Top tech minds driving innovation in AI, cloud and digital platform modernization
• Supportive team and agile, startup-like culture
• Hybrid by design mode and opportunity to work remotely within Poland
• Chance to work abroad for up to 60 days annually
• Business-driven relocation opportunities

We provide growth opportunities:

• Career development programs
• Thought leadership, mentoring, soft skills and well-being programs
• Certification (Anthropic, Gemini, GCP, Azure, AWS)
• English classes

We cover it all:

• Stable pay
• Participation in the Employee Stock Purchase Plan with a 15% discount
• Benefits package (health insurance, multisport, shopping vouchers)
• Referral bonuses up to $2,000
• Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and more
• Corporate, social and well-being events

Please, note:

• Benefits listed above are available to employees only
• We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually
• We will reach out to selected candidates exclusively