Senior Python Developer (Fintech)

Quick Facts

• Role: Senior Python Developer (Fintech)

• Working hours: until 8–9 PM

• Focus: Python development, trading-database SQL, large-scale data processing, and CI/CD

Description

Build and optimize Python data processing workflows and SQL queries for trading databases. Work with Git for collaborative development and participate in CI/CD pipeline operations, including deploying and rolling back changes. Analyze large datasets such as loan-level tapes and model outputs, then reconcile and document differences 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, code reviews)
• Operate CI/CD pipelines: build, testing, deploying, and rolling back changes
• Analyze large, complex datasets (loan-level tapes, 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
• Ability to use conda, poetry, and uv for packaging and virtual environment management
• Skills in writing and optimizing SQL queries
• Experience analyzing large, messy datasets such as loan-level tapes and model outputs
• Capability to reconcile two results and explain the differences
• Experience with Git: branching, Pull Requests, and code reviews
• English proficiency at B2+ level

Benefits

• Hybrid by design mode and possibility to work remotely within Poland
• Opportunity to work abroad up to 60 days annually and potential for business-driven relocation
• Career development programs, thought leadership, mentoring, soft skills, and well-being programs
• Certifications (Anthropic, Gemini, GCP, Azure, AWS) and English classes
• Stable pay and Employee Stock Purchase Plan with a 15% discount
• Benefits package: health insurance, multisport, shopping vouchers
• Referral bonuses up to $2,000
• Corporate, social, and well-being events
• Note: benefits listed are available to employees only; contractor (B2B) terms are agreed individually