Senior Full Stack Engineer

Job Title

Senior Full Stack Engineer

BLN
24

We find strength in teamwork— a better you is a better us. BLN
24 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.

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.

• Design and develop scalable APIs using REST, Graph
  
  QL, 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 Dev Ops 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 Graph
  
  QL 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 Open Shift.
• 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 No
  
  SQL 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.

• Experience with containerization tools and microservices frameworks (e.g., Docker, Kubernetes, Open Shift).
• Familiarity with automated testing frameworks and Dev Ops 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.
• Commi…