Senior Application Developer (AWS/Python) onsite
Washington, DC
Experience: 0
Category: Information Technology
Contractor Work Model: Onsite
Brand: System One
Job ID: 379254
Date Posted: 08/28/2026
Shortcut: http://jobs.systemone.com/HpGL5y
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: 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 (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, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.
System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.
#M1
#LI-VH1
Ref: #851-Rockville-S1
-
Senior AWS Cloud Platform Engineer - Ops / Migration / IaC / Kubernetes
Reston, VA
Senior AWS Cloud Platform Engineer Location: Reston, VA (Hybrid) Duration: 12-Month Contract Pay Rate: $109.05/hr (W2) About the Role We are looking for a highly skilled Senior AWS Cloud Platform Engineer to support a large-scale enterprise cloud envir...
Date Posted: 07/24/2026 Recommended
-
Software Developer
McLean, VA
Software Developer Practice: Software Development & Support / Digital Company: Guidehouse Location: Remote Security and Work Authorization Requirements • Must be able to obtain and maintain a Federal or Department of Defense Public Trust. • Candidates ...
Date Posted: 08/25/2026 Recommended
-
Platform Engineer
McLean, VA
Platform Engineer US Citizenship and the ability to obtain Public Trust is required 100% remote W2 only, no C2C Responsibilities/Requirements: • Implement and maintain modern DevSecOps practices, including secure CI/CD pipelines, automated build and de...
Date Posted: 08/25/2026 Recommended
-
Senior API Platform Software Engineer
Pittsburgh , Pennsylvania
Senior API Platform Software Engineer Fulltime Hybrid – Knoxville, TN | Columbia, SC | Lafayette, LA | Birmingham, AL Position Overview Seeking a Senior API Platform Software Engineer to build and enhance backend services, APIs, and API platform capabi...
Date Posted: 08/28/2026 Recommended
-
AWS Backend/Salesforce Integration Rules Engine Developer
REMOTE, Virginia
Job Title: AWS Backend/Salesforce Integration Rules Engine Developer Location: REMOTE Security Clearance: Must be willing and able to obtain a CMS T4 Public Trust clearance - Must be a US Person and have lived in the United States at least three (3) ou...
Date Posted: 08/27/2026 Recommended
-
DevSecOps Engineer
McLean, VA
DevSecOps Engineer US Citizenship and the ability to obtain Public Trust is required 100% remote W2 only, no C2C Responsibilities/Requirements: • Implement and maintain modern DevSecOps practices, including secure CI/CD pipelines, automated build and d...
Date Posted: 08/25/2026 Recommended
-
Cloud Engineer (onsite)
Washington, DC
Cloud Engineer Washington, DC – 100% Onsite Per Federal contract U.S. Citizenship or Green Card is Required Must be able to pass enhanced background screen (criminal, financial, drug) for Public Trust clearance W-2 or C2C Application Deadline: 8/28/202...
Date Posted: 08/11/2026 Recommended
-
Lead AWS Cloud Platform Engineer - IaC / Automation / SRE
Reston, VA
Lead AWS Cloud Platform Engineer (IaC / Automation / SRE) Type: Contract (approx. 6 months) Schedule: Mon–Fri, 8:00am–5:00pm ET (Eastern Time) Location: Primarily Remote (U.S.-based). If you’re local to the DMV/Reston, some projects may require up to 1...
Date Posted: 07/27/2026 Recommended
-
Java Developer
McLean, VA
Java Full Stack Developer 100% Remote Sponsorship is not available for this position. Candidates must be able to obtain a Public Trust. What You Will Do Join an exciting and meaningful program supported by a collaborative team of more than 200 professi...
Date Posted: 08/26/2026 Recommended
-
Senior Solution Architect
Pittsburgh , Pennsylvania
Job Title: Senior Solution Architect Client: Client Location: Salt Lake City, Utah, United States Type: Contract To Hire Work Model: Onsite – onsite Hours: 40.0 Security Clearance: Not specified in the provided information Overview Responsibilities * S...
Date Posted: 08/06/2026 Recommended
-
Senior Solution Architect
Salt Lake City, Utah
Job Title: Senior Solution Architect Client Location: Salt Lake City, Utah Type: Contract To Hire Work Model: Onsite Experience * 8+ years of progressive experience in software engineering, solution architecture, or enterprise application development *...
Date Posted: 08/06/2026 Recommended
-
Senior Solution Architect
Salt Lake City, Utah
Job Title: Senior Solution Architect Client Location: Salt Lake City, Utah Type: Contract To Hire Work Model: Onsite Experience * 8+ years of progressive experience in software engineering, solution architecture, or enterprise application development *...
Date Posted: 08/06/2026 Recommended
-
Python Full Stack Developer (TS/SCI clearance)
Suitland, Maryland
Python Full Stack Developer Suitland, MD – 2-3 days/week onsite TS/SCI clearance is required Stack: Python/Django, React/Next.js, PostgreSQL/Aurora, AWS (multi-partition), Terraform, GitLab CI/CD, Keycloak We are standing up a small, elite development ...
Date Posted: 07/20/2026 Recommended
-
Application Integration Engineer
McLean, VA
Application Integration Engineer Security Clearance: US Citizenship and the ability to obtain a public trust Responsibilities Responsibility 1: Implement application integration capabilities in support of a large-scale platform modernization program de...
Date Posted: 08/25/2026 Recommended
-
Senior API Platform Software Engineer
Birmingham, Alabama
Job Title - Senior API Platform Software Engineer Locations: Lafayette, LA | Knoxville, TN | Birmingham, AL | Columbia, SC Work Arrangement: Hybrid Employment Type: Full time Experience Required: 5+ years Position Overview We are seeking a Senior API P...
Date Posted: 08/28/2026 Recommended
-
Senior API Platform Software Engineer
Columbia, South Carolina
Job Title - Senior API Platform Software Engineer Locations: Lafayette, LA | Knoxville, TN | Birmingham, AL | Columbia, SC Work Arrangement: Hybrid Employment Type: Full time Experience Required: 5+ years Position Overview We are seeking a Senior API P...
Date Posted: 08/28/2026 Recommended
-
Senior API Platform Software Engineer
Lafayette, Louisiana
Job Title - Senior API Platform Software Engineer Locations: Lafayette, LA | Knoxville, TN | Birmingham, AL | Columbia, SC Work Arrangement: Hybrid Employment Type: Full time Experience Required: 5+ years Position Overview We are seeking a Senior API P...
Date Posted: 08/28/2026 Recommended
-
Senior API Platform Software Engineer
Knoxville, Tennessee
Job Title - Senior API Platform Software Engineer Locations: Lafayette, LA | Knoxville, TN | Birmingham, AL | Columbia, SC Work Arrangement: Hybrid Employment Type: Full time Experience Required: 5+ years Position Overview We are seeking a Senior API P...
Date Posted: 08/28/2026 Recommended
-
Senior AWS Full Stack Engineer
Pittsburgh , Pennsylvania
Job Title: Senior AWS Full Stack Engineer Location: Knoxville, TN, Columbia SC or Lafayette, LA or Birmingham, AL Description: Senior AWS Full Stack Engineer to join a team supporting enterprise applications within the financial services industry. This...
Date Posted: 08/28/2026 Recommended
-
Senior Full Stack Developer
McLean, VA
Senior Full Stack Developer Remote We are seeking a Senior Full Stack Developer to support a federal cloud modernization and product development effort focused on scalable, secure, cloud-native applications hosted in AWS. This is a remote opportunity s...
Date Posted: 06/22/2026 Recommended
-
Platform Engineer (DevOps)
Salt Lake City, Utah
Job Title: Platform Engineer (DevOps) Location: Salt Lake City, UT Responsibilities • Design, build, and optimize enterprise CI/CD pipelines using GitHub Actions and other modern DevOps platforms • Administer enterprise Source Code Management (SCM) rep...
Date Posted: 08/06/2026 Recommended
-
AI/ML Solutions Architect
McLean, VA
Job Title: AI/ML Solutions Architect Location: McLean, VA Type: Contract To Hire Work Model: Remote Hours: 40.0 Clearance: Must be able to obtain a Federal or DoD Public Trust Contact: Crystal.dinnocenti@systemone.com RESPONSIBILITIES Design and implem...
Date Posted: 07/27/2026 Recommended
-
AWS Cloud Data Engineer
McLean, VA
Job Title: AWS Cloud Data Engineer Location: McLean, VA Type: Long-term contract Work Model: Remote Hours: 40.0 Security Clearance: Ability to obtain a Federal Public Trust clearance Contact: Crystal.dinnocenti@systemone.com RESPONSIBILITIES Design, bu...
Date Posted: 06/22/2026 Recommended
-
Senior AWS Full Stack Engineer
Pittsburgh , Pennsylvania
Senior AWS Full Stack Engineer Full-time Hybrid – Knoxville, TN | Columbia, SC | Lafayette, LA | Birmingham, AL Position Overview Seeking a Senior AWS Full Stack Engineer to develop cloud-based enterprise applications across frontend, backend, database...
Date Posted: 08/28/2026 Recommended
-
Senior AWS Full Stack Software Engineer
Pittsburgh , Pennsylvania
Senior AWS Full Stack Software Engineer Full-time Hybrid – Knoxville, TN | Columbia, SC | Lafayette, LA | Birmingham, AL Position Overview Seeking a Senior AWS Full Stack Software Engineer to develop scalable cloud-based enterprise applications using J...
Date Posted: 08/28/2026 Recommended
-
Senior AWS Full Stack Software Engineer
Pittsburgh , Pennsylvania
Job Title: Senior AWS Full Stack Software Engineer Location: Knoxville, TN, Columbia SC or Lafayette, LA or Birmingham, AL Description: Senior AWS Full Stack Software Engineer to develop, modernize, and support enterprise applications within a large sc...
Date Posted: 08/28/2026 Recommended
-
Azure Integration & DevOps Engineer
Arlington, VA
Azure Integration & DevOps Engineer Contract to Hire Arlington, VA: On-Site 4 days a week / 1 day remote Hourly Rate: $90/hr. W2. Benefits Available Conversion Salary: $180,000 annually plus benefits. Clearance: Active Secret Clearance Required (TS is ...
Date Posted: 08/25/2026 Recommended
-
Lead Full-Stack Developer
McLean, VA
Lead Full-Stack Developer Remote This role supports a federal client and requires the ability to obtain a public trust clearance. No sponsorship is available. We are seeking a Lead Full-Stack Developer to support a major federal modernization initiativ...
Date Posted: 06/22/2026 Recommended
-
Java API Tech Lead
Pittsburgh , Pennsylvania
Job Title: Java API Tech Lead Location: Pittsburgh, Pennsylvania Type: Contract To Hire Compensation: $70.00 - $10,000.00 Work Model: Onsite – onsite Hours: 40.0 Security Clearance: Not specified Overview Leave placeholder text here for recruiter to in...
Date Posted: 06/29/2026 Recommended
-
Automation Lead
Dallas , Texas
Job Title: Automation Lead Location: Dallas, Texas, United States Type: Direct Hire Responsibilities Lead the development and maintenance of automation pipelines for vulnerability management, including OS patching, image updates, SSL/TLS configurations...
Date Posted: 08/12/2026 Recommended