- 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
