Senior GraphQL Integration Engineer​/Subject Matter Expert (.NET

Washington, United States | Posted on 05/13/2026

A different kind of consulting company that delivers offshore and nearshore product development, user experience, app modernization, business intelligence, and business apps services.

Washington, DC (Hybrid / Approved Remote)

Able to obtain Public Trust clearance upon hire

Stackular is seeking a highly experienced Graph

QL Integration Engineer with Subject Matter Expertise to support a federal client’s Graph

QL modernization initiative. This role blends hands‑on engineering execution with architectural leadership and advisory responsibilities. You will play a critical role in designing, building, and governing a federated Graph

QL ecosystem while collaborating with cross‑functional teams in a modern .NET‑based environment.

This position is ideal for professionals who can both write production‑grade code and guide architectural decisions at scale.

• Provide technical leadership on Graph
  
  QL federation architecture (Apollo Federation / schema composition)
• Define and enforce schema governance, validation, and versioning strategies
• Review system architecture, APIs, and Graph
  
  QL schemas for scalability and performance
• Advise on API security, query optimization, and complexity management
• Establish and document best practices and reusable patterns
• Design and develop Graph
  
  QL subgraphs and APIs using ASP.NET Core and Hot Chocolate
• Implement robust data access strategies with Postgre
  
  SQL and legacy system integrations
• Build and deploy services in containerized environments (Docker, Kubernetes)
• Contribute across the full SDLC including design, development, testing, CI/CD, and deployment
• Collaborate in Agile teams through sprint planning, code reviews, and retrospectives

• Integrate Graph
  
  QL services into CI/CD pipelines (Azure Dev Ops, Helm)
• Ensure compliance with authentication and authorization standards (OAuth2, JWT, Entra)
• Optimize performance, observability, and reliability of Graph
  
  QL services
• Support integration with enterprise and legacy systems

• 5+ years of experience in backend/API development
• Strong hands‑on experience with Graph
  
  QL (Apollo, Relay, etc.)
• Proficiency in Node.js / Java / Python
• Experience with REST API integration and microservices
• Understanding of API security (OAuth2, JWT, etc.)
• Familiarity with databases (SQL/No
  
  SQL)
• Experience with version control (Git) and CI/CD pipelines
• 10+ years of experience in API architecture and integration
• Deep expertise in Graph
  
  QL design patterns, federation, and schema stitching
• Strong experience in enterprise architecture and distributed systems
• Proven ability to lead large‑scale integration programs
• Expertise in performance tuning, scalability, and security frameworks
• Experience working in federal/government or compliance‑heavy environments
• Strong stakeholder management and leadership skills

• Experience with Graph
  
  QL Federation / Apollo Gateway
• Knowledge of cloud platforms (AWS, Azure, or GCP)
• Exposure to Dev Sec Ops  practices
• Familiarity with federal standards (e.g., security, accessibility, data privacy)