Python Developer Senior (W2)

Job title : Python Developer Senior (W2 Only)

Location : McLean, VA (Looking for Local candidate)

Day – 1 onsite (10+ Years)

Duration: Contract to Hire

Interview Mode: 1st – Virtual | 2nd – Onsite

We are seeking an experienced Senior Python Developer to join our team. The ideal candidate will have a strong background in Python development, PostgreSQL, Flask or FastAPI, and data transformation using modern data-processing frameworks. You will be responsible for designing, developing, and maintaining data-intensive applications and ETL pipelines. Experience with Informatica and scalable data transformation approaches is preferred.

Responsibilities:
• Design, build, and maintain scalable Python applications for data processing and analytics.
• Develop RESTful APIs using Flask or FastAPI.
• Implement and optimize complex SQL queries and database structures in PostgreSQL.
• Architect and maintain ETL pipelines using Informatica, ensuring data quality and integrity. Work with large datasets, ensuring efficient data ingestion, transformation, and storage.
• Develop and optimize data transformation workflows using PySpark.
• Collaborate with cross-functional teams to define technical requirements and deliver solutions.
• Troubleshoot and resolve issues in production environments.
• Mentor junior developers and contribute to best practices.

Requirements:
• Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience).
• 10+ years in IT & 5+ Years of professional experience as a Python developer.
• 3+ years of experience with PostgreSQL, including database design and performance tuning.
• 3+ years of experience developing APIs with Flask or FastAPI. Proven experience working with large datasets and data-intensive applications.
• Experience integrating AI or machine learning models into data pipelines or applications.
• Familiarity with Python-based machine learning libraries such as scikit-learn, TensorFlow, or PyTorch.
• 2+ years of experience with data transformation using PySpark, Dask, Polars, etc. Strong understanding of data modeling, data warehousing, and data integration concepts.
• Experience with version control systems (e.g., Git).
• Excellent problem-solving skills and attention to detail. Strong communication and teamwork abilities.

Preferred Qualifications:
• Hands-on experience with Informatica and ETL processes.
• Experience with cloud platforms. Familiarity with containerization (Docker, Kubernetes).
• Knowledge of data visualization tools and techniques.