Lead Python Developer (FinTech)

Quick Facts

• Role: Lead Python Developer (FinTech)

• Focus: Large-scale trading data, Python workflows, SQL, CI/CD, and data reconciliation

• Working hours: extend to 8–9 PM

Description

Lead Python development for fintech systems, building data processing workflows and maintaining deployment pipelines for large-scale trading databases. Craft and refine SQL for trading data, collaborate via Git-based code review, and support CI/CD builds, testing, deployments, and rollbacks. Reconcile results across multiple data sources and document discrepancies.

Responsibilities

• Build Python data processing workflows while managing virtual environments

• Write and fine-tune SQL queries for trading databases

• Use Git for branching, Pull Request creation, and code reviews

• Handle CI/CD pipeline tasks including builds, testing, deployments, and rollbacks

• Analyze large datasets such as loan-level tapes and model outputs

• Cross-check results from multiple sources and investigate discrepancies

• Document and clarify variances found during data reconciliation

Requirements

• 7+ years working as a Python Developer

• Strong Python, Pandas, and NumPy skills

• Experience with conda, poetry, and uv for package and virtual environment management

• Expertise in SQL query writing and refinement

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

• Ability to reconcile two result sets and explain differences

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

• English proficiency at B2+ level or higher

Benefits

• Hybrid by design with opportunity to work remotely within Poland

• Ability to work abroad up to 60 days annually; 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 15% discount

• Health insurance and multisport; shopping vouchers

• Referral bonuses up to $2,000

• Office perks (entertainment/relax zones, table tennis/football, free snacks and coffee)

• Corporate, social and well-being events

• Benefits apply to employees; contractors may be considered under individually agreed B2B terms