Senior Full Stack Engineer

BLN24 • Mclean, VA

1d

About The Position

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.

Requirements

• 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.

Nice To Haves

• 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.

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.

Benefits

• 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 11-50 employees