Lead Python Developer (Fintech)

Quick Facts

• Role: Lead Python Developer (Fintech)

• Focus: Python data processing workflows, trading database SQL, CI/CD, and dataset reconciliation

• Working hours: extends to 8–9 PM

Description

Lead the development of Python-based data processing workflows for large-scale fintech systems and trading datasets. You will craft SQL queries for trading databases, manage CI/CD build/test/deploy/rollback tasks, and reconcile discrepancies across complex datasets. You will also document variances discovered during reconciliation.

Responsibilities

• Build Python data processing workflows while managing virtual environments

• Write and fine-tune SQL queries for trading databases

• Collaborate in Git workflows (branching, Pull Requests, and code review)

• Support CI/CD pipelines: builds, testing, deployments, and rollbacks

• Analyze large and complex datasets (loan-level tapes, model outputs)

• Reconcile results from multiple sources and investigate discrepancies

• Document and clarify variances found during data reconciliation

Requirements

• 7+ years as a Python Developer

• Strong Python, Pandas, and NumPy

• Proficiency with conda, poetry, and/or uv for package and environment management

• Expert SQL query writing and refinement

• Experience with large unstructured datasets (loan-level tapes, model outputs)

• Ability to reconcile result sets and explain why they differ

• Hands-on Git experience (branching, Pull Requests, code reviews)

• English proficiency at B2+ or higher

Benefits

• Hybrid by design with remote work opportunity within Poland

• Chance to work abroad up to 60 days annually

• Career development programs and mentoring

• Thought leadership and soft-skill/well-being programs

• Certifications listed: Anthropic, Gemini, GCP, Azure, AWS

• English classes

• Stable pay

• Employee Stock Purchase Plan with a 15% discount

• Benefits package: health insurance, multisport, shopping vouchers

• Referral bonuses up to $2,000

• Office amenities and events; corporate, social and well-being events

• Contractor (B2B) option with terms agreed individually