Senior Python Software Engineer

Job Description

Job Description

Job Title: Senior Python Software Engineer.
Location: Tysons, VA (On-site).
Employment Type: Contract (W2).

About the Opportunity:

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.

Required Qualifications:

• 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.

Preferred Qualifications:

• 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:

• 1-round on-site interview only (120 minutes).
• No virtual screening round.
• Candidates must demonstrate strong live coding and technical depth during the on-site interview.

About ZipStaff:

ZipStaff partners with leading organizations to connect skilled technology professionals with high-impact contract opportunities. We focus on quality matches and long-term success.

To apply , please submit your resume highlighting your production Python, OOP, and unit testing experience.