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Senior Application Developer; AWS​/Python) onsite

Job in Washington, District of Columbia, 20001, USA
Listing for: System One Holdings, LLC
Full Time position
Listed on 2026-08-31
Job specializations:
  • Software Development
    AWS, Python, Backend Developer, Full Stack Developer
Job Description & How to Apply Below
Position: Senior Application Developer (AWS/Python) onsite

Senior Application Developer (AWS/Python)

Washington, DC – 100% Onsite Per Federal contract U.S. citizenship is required Must be able to obtain Public Trust clearance W2 or C2C Final date to receive applications: 9/10

Core Responsibilities:

Development & Infrastructure:

  • Develop and maintain Python-based microservices and AWS infrastructure using CDK
  • Model complex business workflows with AWS Step Functions
  • Build containerized applications with RESTful APIs
  • Implement comprehensive logging, monitoring, and audit trails (Cloud Watch, Cloud Trail)

Quality &

Collaboration:

  • Conduct code reviews focused on maintainability, performance, and best practices
  • Write unit tests and integration tests; perform code remediation
  • Contribute to architecture decisions and maintain technical documentation
  • Collaborate with stakeholders to translate business requirements into technical solutions

Required Qualifications:

Core Technical

Skills:

  • Python:
    Production-grade development with modern frameworks and testing libraries
  • AWS CDK:
    Infrastructure-as-code for multi-environment deployments
  • CI/CD:
    Hands-on pipeline creation and management for cloud applications
  • API Design: RESTful service design, versioning, and error handling
  • Version Control:
    Git workflows, branching strategies, merge request reviews

Technical Stack:
Primary (daily use expected):

  • Python 3.9+, AWS Lambda, Step Functions
  • IaC: CDK, Terraform experience
  • DynamoDB, S3, API Gateway, Cloud Watch, Cloud Trail
  • Docker, Git/Git Lab

Secondary (nice to have):

  • Frontend:
    Angular or React (Type Script)
  • AWS Services: SNS/SQS, Athena, Glue, Load Balancers

Productivity Tools (Plus):

  • AI-Assisted Development
  • Experience using AI coding assistants such as Claude Code for:
    • Code review and optimization suggestions
    • Documentation generation
    • Debugging and troubleshooting
    • Test case development
  • Ability to critically evaluate and adapt AI-generated code

Education & Experience:

  • BS in Computer Science/IT or equivalent work experience
  • 7+ years software development experience with SDLC and Agile methodologies
Position Requirements
10+ Years work experience
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