Senior Python Developer (Fintech)

Quick Facts

• Role: Senior Python Developer (Fintech)
• Focus: Python data processing, trading databases, CI/CD, and data reconciliation

Description

Senior Python Developer role in fintech focused on building Python data processing workflows and optimizing SQL for large trading datasets. You will collaborate via Git and help operate CI/CD pipelines for building, testing, deploying, and rolling back changes. The work includes analyzing large datasets (e.g., loan-level tapes and model outputs) and explaining discrepancies between sources.

Responsibilities

• Develop data processing workflows using Python and manage virtual environments
• Write and optimize SQL queries for trading databases
• Collaborate via Git: branching, Pull Requests, and code reviews
• Participate in CI/CD pipeline operations, including build, test, deploy, and rollback
• Analyze large, complex datasets such as loan-level tapes and model outputs
• Reconcile results from different sources and investigate discrepancies
• Explain and document differences found during data reconciliation

Requirements

• 5+ years of experience as a Python Developer
• Proficiency in Python, Pandas, and NumPy
• Flexibility to use conda, poetry, and uv for packaging and virtual environment management
• Skills in writing and optimizing SQL queries
• Background in analyzing large, messy datasets (loan-level tapes and model outputs)
• Ability to reconcile two results and clearly explain differences
• Experience with Git, including branching, Pull Requests, and code reviews
• Proficiency in English at B2+ level

Benefits

• Hybrid by design with opportunity to work remotely within Poland
• Chance to work abroad up to 60 days annually; business-driven relocation opportunities
• Career development programs; mentoring and soft skills/well-being programs
• Certifications (Anthropic, Gemini, GCP, Azure, AWS); English classes
• Stable pay and Employee Stock Purchase Plan with a 15% discount
• Health insurance, Multisport, and shopping vouchers
• Referral bonuses up to $2,000
• Office amenities and events; corporate, social, and well-being activities
• Note: benefits are for employees only; contractor (B2B) terms can be agreed individually