Senior Application Developer (AWS/Python) (US citizen, 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

Application Deadline: 10/7

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 (CloudWatch, CloudTrail)

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, CloudWatch, CloudTrail

• Docker, Git/GitLab

Secondary (nice to have):

• Frontend: Angular or React (TypeScript)

• AWS Services: SNS/SQS, Athena, Glue, Load Balancers

Productivity Tools (Plus):

• AI-Assisted Development

• Experience using AI coding assistants such as Claude Code for:

o Code review and optimization suggestions

o Documentation generation

o Debugging and troubleshooting

o 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

System One is a leading provider of specialized, highly technical services and solutions to critical infrastructure, technology, life sciences, and government sectors. We partner with large private and public organizations who trust us to execute their complex, mission-critical initiatives through our outsourced services and workforce solutions.