The Role
The Senior Full Stack Engineer will modernize IRS API ecosystems, leading development of scalable applications while ensuring enterprise compliance, security, and performance.
Summary Generated by Built In
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:
Preferred Qualifications:
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.
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.
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.
- 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.
- 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.
Top Skills
Angular
AWS
Azure
CSS
Databricks
GCP
GraphQL
Grpc
HTML
Java
JavaScript
Jwt
Kubernetes
Node.js
Oauth
Openshift
Python
React
Rest
Spark
Vue
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The Company
What We Do
BLN24 is a digital creative agency that is an 8(a) minority-owned small disadvantaged business (SDB). We add value by merging our commercial and government experience to create award-winning solutions for clients with the most important missions globally. BLN24 is a first-class communication, marketing, and technology agency for federal agencies and Fortune 500 companies.
Founded by two former Booz Allen Hamilton employees, BLN24’s
industry-lead marketing and communications strategies along with
production and visual design has been on web and print advertisement
campaigns as well as television networks across the nation.
