SENIOR FULL STACK ENGINEER
Btree Solutions
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:
The manager repeatedly highlighted testing needs. Candidates must have strong automated testing experience.
Required frameworks include:
Backend/API Testing
The team specifically needs help increasing test coverage across the application.
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 React
- Strong experience with Redux
- Ability to work in existing enterprise UI codebases
- Experience building maintainable and scalable front-end components
- Strong experience with Node.js
- Experience building and supporting backend services/APIs
- Familiarity with AWS cloud-based backend services
- AWS Lambda
- AWS ECS
- Experience supporting production cloud applications
- Strong relational database experience
- PostgreSQL preferred
The manager repeatedly highlighted testing needs. Candidates must have strong automated testing experience.
Required frameworks include:
Backend/API Testing
- Mocha
- Jest
- Playwright
- Vitest
The team specifically needs help increasing test coverage across the application.
Vacancy posted 4 days ago
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