SENIOR FULL STACK ENGINEER

Job Title: SENIOR FULL STACK ENGINEER Location: Mclean,VA Duration: 12+ Months Visa: USC, GC, H1B and EAD Contract Type: W2 The hiring manager is seeking two senior-level Full Stack Software Engineers to join a small, high-impact team responsible for an internal enterprise application called Vessel, which supports email template management within the Associate Experience Technology (AXT) organization. This application is already established and actively used, but it is described as a medium-to-large scale system with a growing backlog, limited engineering bandwidth, and a need for modernization, stability improvements, and new feature delivery. The manager emphasized that the team is lean, currently consisting of two long-tenured senior developers, one junior developer who joined recently, and the manager, so they need contractors who can come in and contribute quickly with minimal ramp-up time. These hires are expected to immediately help reduce backlog, improve testing coverage, enhance existing functionality, and strengthen overall platform reliability. Core Technical Skill Set Required This is a true full stack JavaScript role, with work split approximately 50% frontend / 50% backend, depending on feature priorities. Frontend Requirements:Strong hands-on experience with ReactStrong experience with ReduxAbility to work in existing enterprise UI codebasesExperience building maintainable and scalable front-end components Backend Requirements:Strong experience with Node.jsExperience building and supporting backend services/APIsFamiliarity with AWS cloud-based backend services Cloud / Infrastructure:AWS LambdaAWS ECSExperience supporting production cloud applications Database:Strong relational database experiencePostgreSQL preferred Testing / Quality Engineering (Very Important): The manager repeatedly highlighted testing needs. Candidates must have strong automated testing experience. Required frameworks include: Backend/API TestingMochaJest Frontend/UI TestingPlaywrightVitest The team specifically needs help increasing test coverage across the application.