Sr. Software Engineer (Front End)

Rockville, MD
Full Time
Mid Level

Sr. Software Engineer (Front End) 

ESI provides direct support to the Frederick National Lab (FNL) in its support of the National Cancer Institute (NCI) and its 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 Cancer Research Data Commons (CRDC) and the Childhood Cancer Data Initiative (CCDI) are two of the highest-priority programs at the NCI. The CRDC is a secure, cloud-based data science infrastructure that accelerates cancer research by facilitating data submission, sharing, access, interoperability, and cost-effective analysis at scale. The CCDI Data Ecosystem is a dynamic and evolving infrastructure that brings together data from various collections generated or held at institutions across the country and worldwide, ensuring quality and consistency for the broader research community. 

Both 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. 

Roles & Responsibilities of the Sr. Software Engineer:

  • 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. 

Basic Qualifications of the Sr. Software Engineer:

  • 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. 

Preferred Qualifications:

  • 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. 

Work With ESI 

In a time when federal agencies have relied on novel technology solutions, ESI stands as a trusted partner. We have built our success on our commitment to technology, teamwork, and trust. At ESI, we acknowledge and celebrate our talented staff who consistently strive for and achieve excellence. 

ESI offers a robust benefits package that includes health care, paid time off, 401(k) retirement savings, professional development opportunities, and more. 

Salary range: $110,000–$130,000 per year, depending on skills and experience.  

Work Location: Hybrid (1 day in office, 4 days remote per week) in Rockville, MD 20850 

Equal Opportunity Employer 

ESI is an Equal Opportunity Employer (EOE). We are committed to creating an inclusive environment for all employees, including equitable hiring and promotion practices, and ongoing learning that supports belonging for every team member. 

Work Authorization Notice

Candidates must be legally authorized to work in the United States at the time of hire. ESI is unable to provide employment visa sponsorship for this position now or in the future. Because this role is performed in support of government contract work and does not allow ESI to provide the level of direct employer oversight and training administration required for certain temporary work authorization categories, ESI cannot support those employer-specific training obligations for this position. 

Essential Software Inc. provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type, without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training.

Share

Apply for this position

Required*
We've received your resume. Click here to update it.
Attach resume or Paste resume
Attach resume as .pdf, .doc, .docx, .odt, .txt, or .rtf (limit 5MB) or Paste resume

Paste your resume here or Attach resume file

To comply with government Equal Employment Opportunity and/or Affirmative Action reporting regulations, we are requesting (but NOT requiring) that you enter this personal data. This information will not be used in connection with any employment decisions, and will be used solely as permitted by state and federal law. Your voluntary cooperation would be appreciated. Learn more.
Invitation for Job Applicants to Self-Identify as a U.S. Veteran
  • A “disabled veteran” is one of the following:
    • a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or
    • a person who was discharged or released from active duty because of a service-connected disability.
  • A “recently separated veteran” means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.
  • An “active duty wartime or campaign badge veteran” means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.
  • An “Armed forces service medal veteran” means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.
Veteran status


Voluntary Self-Identification of Disability
Voluntary Self-Identification of Disability Form CC-305
OMB Control Number 1250-0005
Expires 04/30/2026
Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to:

  • Alcohol or other substance use disorder (not currently using drugs illegally)
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, HIV/AIDS
  • Blind or low vision
  • Cancer (past or present)
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or serious difficulty hearing
  • Diabetes
  • Disfigurement, for example, disfigurement caused by burns, wounds, accidents, or congenital disorders
  • Epilepsy or other seizure disorder
  • Gastrointestinal disorders, for example, Crohn's Disease, irritable bowel syndrome
  • Intellectual or developmental disability
  • Mental health conditions, for example, depression, bipolar disorder, anxiety disorder, schizophrenia, PTSD
  • Missing limbs or partially missing limbs
  • Mobility impairment, benefiting from the use of a wheelchair, scooter, walker, leg brace(s) and/or other supports
  • Nervous system condition, for example, migraine headaches, Parkinson’s disease, multiple sclerosis (MS)
  • Neurodivergence, for example, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, dyslexia, dyspraxia, other learning disabilities
  • Partial or complete paralysis (any cause)
  • Pulmonary or respiratory conditions, for example, tuberculosis, asthma, emphysema
  • Short stature (dwarfism)
  • Traumatic brain injury
Please check one of the boxes below:

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.

You must enter your name and date
Human Check*