Senior Full Stack Engineer

McLean, VA
Full Time
Technology
Experienced
Job Title: Senior Full Stack Engineer
Company: BLN24

About Us: We find strength in teamwork-a better you is a better us
BLN24 is an award-winning Management Consulting Firm that supports the U.S. Federal Government in successfully achieving their mission and goals. Our service and solutions delivery start with understanding each client’s end-state, and then seamlessly integrating within each Agency’s organization to improve and enhance strategic and technical operations and deployments.

Position Overview:
The Senior Full Stack Engineer will support the modernization of IRS mission-critical API ecosystems and cloud-native applications. This role requires technical leadership across the software development lifecycle, with a focus on designing, developing, and maintaining secure, scalable APIs and full-stack applications that interface with legacy systems, cloud platforms, and AI/ML services.

The ideal candidate will bring extensive experience in modern programming frameworks, backend and frontend integration, and API architecture, while collaborating with cross-functional teams to drive innovation, observability, and performance in alignment with Treasury and IRS enterprise standards.

Key Responsibilities:
  • Design and develop scalable APIs using REST, GraphQL, and gRPC in compliance with IRS enterprise architecture and security standards (OAuth, JWT).
  • Lead full-stack development of modern, modular web applications that interface with IRS systems and external users.
  • Decompose and migrate legacy system functionality (e.g., COBOL-based command codes) into modern service-oriented components.
  • Integrate AI-driven services, including ML model endpoints, auto-generated documentation, code conversion workflows, and intelligent test automation.
  • Implement CI/CD pipelines and automated testing tools (e.g., Postman, Newman) to ensure secure, validated, and maintainable code.
  • Collaborate with DevOps and Site Reliability Engineers to embed observability tools (e.g., Prometheus, Datadog, New Relic) and monitoring dashboards.
  • Translate business and functional requirements into API contracts and reusable service patterns, working within Agile Scrum teams.
  • Maintain backward compatibility with legacy systems while building toward scalable, cloud-optimized services.
  • Ensure IRS and Treasury IT governance compliance, including Section 508 accessibility and cybersecurity policies.
Required Qualifications:
  • Bachelor’s degree in Computer Science, Engineering, or related field.
  • Minimum 6 years of experience in full-stack software development and architecture.
  • Demonstrated expertise in designing and implementing RESTful and GraphQL APIs, and building service-oriented architectures.
  • Proficiency with front-end frameworks such as React, Angular, or Vue, and backend technologies such as Node.js, Python, Java, or Spark.
  • Solid working knowledge of core web technologies, including HTML, CSS, JavaScript, and modern UI component libraries.
  • Hands-on experience with cloud platforms (AWS, GCP, Azure) and container orchestration tools including Kubernetes and OpenShift.
  • Familiarity with platforms such as Databricks for data engineering, pipeline integration, or ML model support.
  • Experience designing scalable, secure web applications and microservices architectures with considerations for caching, authentication, and maintainability.
  • Working knowledge of SQL and NoSQL databases, CI/CD pipelines, infrastructure-as-code, and cloud monitoring tools.
  • Experience collaborating in Agile delivery environments, and contributing to code reviews, documentation, and team-based development workflows.
  • Ability to lead development initiatives, mentor junior engineers, and provide architectural guidance across full-stack systems.

Preferred Qualifications: 
  • Experience with containerization tools and microservices frameworks (e.g., Docker, Kubernetes, OpenShift).
  • Familiarity with automated testing frameworks and DevOps pipelines.
  • Exposure to mobile/web hybrid frameworks or performance optimization techniques in distributed systems.
  • Background in API-first development and reusable design patterns in large-scale environments.
  • Prior experience working with IRS, Treasury, or other federal IT systems a plus. 
Soft Skills:
  • Strong analytical and problem-solving abilities, especially in distributed or legacy-modernization contexts.
  • Clear and proactive communication with technical and non-technical stakeholders.
  • Team-oriented, flexible, and comfortable in a fast-paced, Agile environment.
  • Committed to code quality, maintainability, and continuous improvement.
  • Highly collaborative, with a mentoring mindset and a focus on scalable solutions.

What BLN24 brings to the Game:
BLN24 benefits are game changing. We like our team to play hard and that means they need to be taken care of — physically, financially, and emotionally. We make sure to keep them in the game by giving them access to generous medical, dental, and vision plans.
  • You can join one of the fastest growing companies headquartered in the Washington DC Metro Area.  We give you the opportunity to work in different sectors, so you have the chance at variety while maintaining stability.
  • Flexibility at BLN24 allows each individual the opportunity to balance quality work and their personal lives. Depending on projects, we allow remote working opportunities so you can always be in the game no matter where you call home.

BLN24 is an Equal Opportunity Employer. We believe people are our strength and understand diverse talents are key to our success. We are an equal opportunity employer and place a high value on diversity and inclusion at our company. We do not discriminate on the basis of any protected attribute, including race, religion, color, national origin, gender, sexual orientation, gender identity, gender expression, age, marital or veteran status, pregnancy or disability, or any other basis protected under applicable law. In accordance with applicable law, we make reasonable accommodations for applicants' and employees' religious practices and beliefs, as well as any mental health or physical disability needs.
 

 
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*