Senior Python Software Engineer

Work on mission-critical forecasting and accounting

Zip Staff Inc. is hiring a Senior Python Software Engineer for an onsite contract role in Tysons, VA (about 70 to 72 USD per hour). You will join a financial forecasting and accounting platform team building and improving capabilities on the Checkmate platform. The work is hands-on and production-focused, including refactoring existing components, creating new custom components, and performing deep integration and testing across data and application layers.

Responsibilities

• Refactor and modernize components of a financial forecasting and accounting application
• Design and develop new custom components and integrate them into the Checkmate platform
• Carry out heavy integration across data, services, and application layers
• Write clean, maintainable, production-grade Python using strong Object-Oriented Programming (OOP) practices
• Build and maintain automated unit and integration tests using pytest or an equivalent framework
• Support critical production runs, troubleshoot issues, and help 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

What you’ll bring

• 5+ years of hands-on production-grade Python engineering (automation-only or scripting-only backgrounds will not be considered)
• Strong OOP skills in Python
• Solid experience with unit testing and automated test frameworks, with pytest strongly preferred
• Experience using 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 onsite in Tysons, VA

Tools and technologies

Python, pytest, Git, SQL, Docker/Kubernetes, Pandas

Preferred qualifications

• Experience with Pandas
• Familiarity with containerization technologies such as Docker/Kubernetes
• Exposure to financial forecasting, fixed income concepts, or accounting systems
• Experience supporting production systems where accuracy and reliability requirements are high

Benefits

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

Interview process

• On-site interview with live coding and demonstration of technical depth
• In person interview

Application questions

• 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?