Senior Python Developer

Quick Facts

• Role: Senior Python Developer (Fintech)

• Focus: Application development for large-scale data workflows and trading databases

• Working hours: until 8–9 PM

Description

Develop data processing workflows in Python for large-scale fintech systems, including work with trading databases and optimized SQL. You will analyze large datasets (e.g., loan-level tapes and model outputs), reconcile results across sources, and document discrepancies. You’ll collaborate using Git and support CI/CD pipeline operations (build, test, deploy, rollback).

Responsibilities

• Build Python-based data processing workflows 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, test, deploy, rollback

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

• Ability to reconcile results and explain the difference

• Experience with Git, including branching, Pull Requests, and code reviews

• English proficiency at B2+ level

Benefits

• Hybrid by design with opportunity to work remotely within Poland

• Opportunity to work abroad up to 60 days annually

• Career development programs and mentoring

• Thought leadership, soft skills, and well-being programs

• Certifications (Anthropic, Gemini, GCP, Azure, AWS)

• English classes

• Stable pay

• Employee Stock Purchase Plan with a 15% discount

• Health insurance, Multisport, shopping vouchers

• Referral bonuses up to $2,000

• Office benefits (entertainment/relaxation zones, table tennis, football, free snacks and coffee)

• Corporate, social, and well-being events

• Contractors welcome (B2B terms agreed individually)

• Selected candidates will be contacted exclusively