Senior Full Stack Engineer

Bln24 • McLean, VA

17h

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: Senior