Sr. Software Engineer (Front End)

Essential Software•Rockville, MD

22h•Hybrid

About The Position

ESI provides direct support to the Frederick National Lab (FNL) and its clients at the National Cancer Institute (NCI), aiding their mission to accelerate the prevention and treatment of cancer. FNL's support of NCI includes the management and execution of IT projects sponsored by the NCI Center of Biomedical Informatics and Information Technology (CBIIT). The organization supports several high-priority programs focused on advancing research through modern data infrastructure. These programs provide secure, cloud-based environments that accelerate discovery by facilitating data submission, sharing, access, interoperability, and cost-effective analysis at scale. The data ecosystems are dynamic and evolving infrastructures that bring together data from various collections generated or held at institutions across the country and worldwide, ensuring quality and consistency for the broader research community. The systems include: Enhanced cloud-computing platforms. Services that link disparate information, including clinical, image, and molecular data. Standards and tools so that data are interoperable. Essential underlying data science infrastructure, methods, and portals for the Cancer Data Ecosystem. Sustainable data governance to ensure long-term health of the Ecosystem.

Requirements

Possession of a bachelor's degree from an accredited college/university according to the Council for Higher Education Accreditation (CHEA) in Computer Science, Web Development, or a related field.
At least 3+ years of experience in the above roles and responsibilities.
Demonstrated expertise in React.js, including hooks, context, state management (Redux or equivalent), and component-driven architecture.
Proficiency in Node.js, including building middleware, API integrations, and development tooling.
Experience with HTML5, CSS3, JavaScript (ES6+), and responsive/accessible design principles (WCAG 2.1).
Familiarity with front end build tools such as Webpack, Vite, or similar.
Experience with version control systems (Git) and CI/CD pipelines.
Excellent verbal and written communication skills, including experience working directly with customers and stakeholders to translate requirements into user-centered designs.
Strong ability to prioritize, manage, and communicate the status of multiple concurrent tasks.
Exceptional interpersonal and collaboration skills, with experience working in cross-functional team environments.
Ability to work effectively in a complex, fast-paced environment, including with government stakeholders and in adherence to government practices and processes.

Nice To Haves

Experience with AWS services (S3, CloudFront, Amplify, or similar) and cloud-hosted front-end deployments.
AWS AI Practitioner or AWS Associate certification.
Familiarity with data visualization libraries (D3.js, Recharts, or similar) in the context of scientific or research platforms.
Prior experience working on federal or government-sponsored IT programs.

Responsibilities

Collaborate with UX designers, back-end engineers, and product owners to deliver high-quality front-end solutions that meet user needs and follow established design systems and development standards.
Architect, develop, and maintain scalable React.js applications and component libraries used across CRDC and CCDI platforms.
Build and integrate RESTful and GraphQL APIs using Node.js, ensuring seamless communication between front end interfaces and back-end services.
Create and manage technical documentation, including component documentation and front-end architecture guides.
Work with business users and stakeholders to develop and implement acceptance tests, ensuring products meet customer requirements and accessibility standards.
Monitor front end application performance, identify bottlenecks, and implement optimizations for speed and reliability.
Integrate existing software and design systems into new or modified environments.
Implement recommendations for improving front end development processes, coding standards, and documentation practices.
Actively engage in process improvement and Agile/Scrum ceremonies.
Integrate AI-assisted development tools into workflows responsibly and help define safe patterns for their use.
Proactively mentor junior teammates through code reviews, pairing sessions, and knowledge sharing.