Senior Front-End Software Development Engineer

Vantor•Herndon, VA

11d•$137,000 - $200,200•Hybrid

About The Position

Vantor is seeking a Senior Front-End Software Engineer to support the development and modernization of a mission-critical big data analytics platform for a United States Government customer. The successful candidate will design and build secure, scalable, and intuitive web applications that enable analysts and decision-makers to access, visualize, and interact with large-scale datasets. This role requires close collaboration with product owners, UX designers, back-end engineers, data engineers, and cybersecurity personnel within an Agile development environment. This position requires an active U.S. Government Security Clearance at the TS/SCI with CI poly level. To be eligible for this position, you must be a U.S. Citizen. This position requires an active U.S. Government security clearance, applicants who do not currently hold the required clearance will not be eligible for consideration. Employment for cleared roles is contingent upon verification of clearance status. Export Control/ITAR: Certain roles may be subject to U.S. export control laws, requiring U.S. person status as defined by 8 U.S.C. 1324b(a)(3).

Requirements

US citizenship and an active TS/SCI clearance is mandatory for this position and required for consideration.
Must be willing to obtain a CI Poly.
Minimum of 14 years of total professional experience in a technical support role.
Strong UI/UX skills with a focus on building responsive, user-friendly interfaces
Proficient in front-end and scripting languages such as JavaScript, Python, Java, and R; experienced in data extraction, manipulation, and visualization
Experience with modern front-end frameworks such as React, Angular, or Vue.js.
Experience consuming RESTful APIs and working with JSON-based data services.
Strong understanding of HTML5, CSS3, responsive design, and web accessibility standards.
Experience with state management, component-based architectures, and front-end build tools.
Familiarity with Agile software development methodologies and DevSecOps practices.
Experience using Git-based source control and CI/CD pipelines.
Experience designing software solutions with geospatial data types/formats and standards.
Bachelor's degree or equivalent experience in Software Engineering, User Interface Design, Graphics, or like technical fields

Nice To Haves

Experience supporting federal government, defense, intelligence, or national security programs.
Experience developing user interfaces for big data, analytics, AI/ML, or data visualization platforms.
Proficiency with data visualization libraries such as D3.js, ECharts, Plotly, or similar technologies.
Experience with cloud-native environments, including AWS, Azure Government, or Kubernetes-based platforms.
Familiarity with microservices architectures and API-driven application design.
Experience with automated testing frameworks such as Jest, Cypress, Playwright, or Selenium.
Strong oral and written communication skills.

Responsibilities

Design, develop, test, and maintain modern web-based user interfaces for enterprise-scale analytics applications.
Build responsive, accessible, and high-performance front-end solutions using contemporary JavaScript frameworks.
Collaborate with back-end and data engineering teams to integrate APIs, data services, and visualization components.
Develop dashboards, reporting tools, and interactive data exploration capabilities for large and complex datasets.
Participate in architecture discussions and contribute to front-end technical strategy and best practices.
Ensure compliance with government security, accessibility, and software quality requirements.
Perform code reviews, mentor junior developers, and promote engineering excellence across the team.
Support Agile ceremonies, including sprint planning, backlog refinement, and retrospectives.
Troubleshoot and resolve production issues while continuously improving application performance and usability.
Work at corporate office site 3 days per week.
Work in a SCIF as program and team needs dictate.