Only W2 (No C2C, No 1099, No H1b, No OPT EAD)
Title: Senior Software Developer (Python Backend)
Location: McLean, VA (5 days - Onsite)
Must Have Qualifications: 5+ Backend Development with Python engineering- large data libraries, working with databases, and working with large currency.
Position Overview
client's Investments & Capital Markets division is seeking a Senior Software Developer (Python Backend) to support the development and enhancement of mission-critical applications built on modern software development frameworks.
The ideal candidate will contribute across the full software development lifecycle, including new feature development, code refactoring, defect resolution, technical debt reduction, performance improvements, and migration initiatives. This role supports both customer-facing and internal applications/services and requires strong expertise in backend Python engineering and large-scale data processing.
Key Responsibilities
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Design, develop, and maintain backend services and applications using Python
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Work with large datasets, currency-related data, and high-volume transactional systems
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Implement and optimize database interactions and data processing workflows
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Participate in code refactoring, defect fixes, and technical debt remediation
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Support application migrations and modernization efforts
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Collaborate with cross-functional teams across development, testing, and operations
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Contribute to testing, verification, deployment, monitoring, and maintenance of applications
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Ensure solutions align with scalability, performance, and reliability standards
Must-Have Qualifications
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5+ years of backend development experience using Python
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Strong experience working with large data libraries and frameworks
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Hands-on experience with databases (relational and/or NoSQL)
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Experience handling large currency or financial datasets
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Solid understanding of software development lifecycle (SDLC)
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Ability to work in a fast-paced, enterprise-scale environment
Nice-to-Have Skills
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Experience in financial services or capital markets
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Familiarity with modern software development frameworks
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Exposure to cloud-based architectures and services
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Strong debugging, performance tuning, and optimization skills