Senior Python Developer (Fintech)

Quick Facts

• Role: Senior Python Developer (Fintech)
• Focus: Python data processing, SQL for trading databases, dataset reconciliation, Git collaboration, and CI/CD support
• Working hours: until 8–9 PM

Description

Build and optimize Python-based data processing workflows for large-scale fintech systems and trading databases. You will write and optimize SQL queries, analyze large datasets (loan-level tapes and model outputs), reconcile results across sources, and support CI/CD operations through development, testing, deployment, and rollback. You’ll collaborate via Git and document findings from data reconciliation.

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
• Operate CI/CD pipelines: build, test, deploy, and roll back changes
• 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 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 such as loan-level tapes and model outputs
• Capability to reconcile two results and explain the difference
• Experience with Git, including branching, Pull Requests, and code reviews
• Proficiency in English at a B2+ level

Benefits

• Hybrid-by-design with opportunity to work remotely within Poland
• Chance to work abroad for up to 60 days annually and business-driven relocation opportunities
• Career development programs; mentoring and soft skills/well-being programs
• Certifications (Anthropic, Gemini, GCP, Azure, AWS)
• English classes
• Stable pay; Employee Stock Purchase Plan with a 15% discount
• Health insurance, multisport, and shopping vouchers
• Referral bonuses up to $2,000
• Office perks (entertainment/relaxation zones, table tennis and football, free snacks and coffee)
• Corporate, social, and well-being events
• Open to B2B contractors (terms agreed individually)