Sr. Full Stack Engineer (Top Secret Clearance Required)

1. Senior Full Stack Engineer

Position Description:

i3 is seeking a Full Stack Engineer – Senior to support application design, development, integration, and modernization for a major federal transformation program. This senior role develops secure, scalable, cloud-ready solutions and works across the entire stack—front-end, back-end, APIs, databases, and cloud environments. The Full Stack Engineer collaborates with Product, DevSecOps, Cloud, Data, QA, and Migration teams to deliver mission-critical capabilities that meet federal performance, security, and compliance standards.

Your future duties and responsibilities:

Application & API Development

· Design, develop, and maintain front-end and back-end components for enterprise applications

· Build and optimize REST APIs, microservices, and system-to-system integrations

· Ensure code quality, performance, and maintainability across the full stack

 

Cloud-Ready Engineering

· Develop cloud-compatible services and applications (AWS preferred)

· Support deployment of pipelines, infrastructure integration, and CI/CD workflows

· Align application architecture with modernization and cloud migration requirements

Technical Leadership & Collaboration

· Collaborate with Scrum Masters, Product Leads, QA Automation Engineers, Cloud Engineers, and Data Engineers

· Participate in sprint planning, backlog refinement, technical design reviews, and demos

· Mentor mid-level engineers and support knowledge-sharing across teams

Security, Performance & Compliance

· Implement secure coding practices, logging, auditing, and data-handling requirements

· Conduct performance tuning, optimization, and reliability improvements

· Ensure delivery aligns with federal security standards and program governance

Testing & Quality Support

· Support automated testing and validation of application functionality and integrations

· Troubleshoot defects across the stack and coordinate with QA to resolve issues

· Validate readiness for release and major deployment events

Documentation & Reporting

· Develop technical design documents, API specifications, data flow diagrams, and code documentation

· Maintain full-stack engineering artifacts required for release, sustainment, and audits

· Provide status updates and technical insights to leadership and cross-functional teams

Required qualifications to be successful in this role:

· Must have an Active Top Secret Security Clearance

· U.S. Citizenship

· Bachelor’s degree and 8+ years of experience in software engineering or full-stack development

 

· Experience developing both front-end and back-end solutions using modern frameworks

· Hands-on experience with APIs, microservices, relational and NoSQL databases

· Experience with CI/CD pipelines, Git, DevSecOps environments, and automated testing

· Strong ability to troubleshoot issues across the entire stack

· Excellent communication and documentation skills

Preferred Qualifications

· Experience supporting DOJ, FBI, Intelligence Community, or other national-security programs

· Experience with cloud-native architectures (AWS strongly preferred)

· Familiarity with containerization (Docker), orchestration (Kubernetes), or serverless frameworks

· Experience with performance engineering, load testing, or automated quality pipelines

· Knowledge of Python, Java, JavaScript/TypeScript, or similar languages used across full-stack systems