Senior Python Software Engineer

ZipStaff is seeking a Senior Python Software Engineer to join a high-impact financial forecasting and accounting platform team at a major financial institution.

You will work on the Checkmate platform (the modern replacement for a legacy system), focusing on refactoring existing components, building new custom features, and performing heavy integration and testing work. This role requires strong production-grade Python engineering skills and the ability to deliver clean, well-tested, object-oriented code.

What You’ll Do

• Refactor and modernize existing components of a financial forecasting and accounting application
• Design and develop new custom components and integrate them into the Checkmate platform
• Perform heavy integration work across data, services, and application layers
• Write clean, maintainable, production-grade Python code using solid Object-Oriented Programming principles
• Develop and maintain strong automated unit and integration tests (pytest or equivalent)
• Support critical production runs, troubleshoot issues, and ensure accuracy and reliability of outputs
• Collaborate with stakeholders and team members to analyze requirements and deliver end-to-end solutions
• Participate in code reviews, design discussions, and continuous improvement of engineering practices

• Minimum 5 years of hands-on production-grade Python software engineering experience (scripting or automation-only backgrounds will not be considered)
• Strong Object-Oriented Programming (OOP) skills in Python
• Solid experience with unit testing and automated test frameworks (pytest strongly preferred)
• Experience with Git in a team-based development environment
• Strong SQL and relational database skills
• Ability to write clean, testable, high-quality code and work in an Agile environment
• Excellent problem-solving and communication skills
• Ability to work on-site in Tysons, VA, * Experience with Pandas
• Familiarity with containerization (Docker/Kubernetes)
• Exposure to financial forecasting, fixed income concepts, or accounting systems
• Experience supporting production systems with high accuracy and reliability requirements

Interview Process

• Candidates must demonstrate strong live coding and technical depth during the on-site interview
• In person interview, * Are you legally authorized to work in the United States?
• Will you now or in the future require employer sponsorship for employment authorization?
• Do you have strong Object-Oriented Programming (OOP) experience in Python along with unit testing using frameworks such as pytest?

Experience:

• production-grade Python software engineering: 5 years (Required)

$70 - $72 an hour - Full-time, Contract, Pulled from the full job description

• Referral program
• 401(k)
• 401(k) matching
• Paid time off, * 401(k)
• 401(k) matching
• Paid time off
• Referral program