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

Job Title: Senior GraphQL Integration Engineer / Subject Matter Expert (.NET) Location: Washington, DC (Hybrid / Approved Remote) Engagement Type: Full - Time Clearance: Able to obtain Public Trust clearance upon hire Role Overview Stackular is seeking a highly experienced GraphQL Integration Engineer with Subject Matter Expertise to support a federal client’s GraphQL 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 GraphQL 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. Key Responsibilities Architecture & Advisory Provide technical leadership on GraphQL federation architecture (Apollo Federation / schema composition) Define and enforce schema governance, validation, and versioning strategies Review system architecture, APIs, and GraphQL schemas for scalability and performance Advise on API security, query optimization, and complexity management Establish and document best practices and reusable patterns Engineering & Delivery Design and develop GraphQL subgraphs and APIs using ASP.NET Core and Hot Chocolate Implement robust data access strategies with PostgreSQL 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 Integration & Operations Integrate GraphQL services into CI/CD pipelines (Azure DevOps, Helm) Ensure compliance with authentication and authorization standards (OAuth2, JWT, Entra) Optimize performance, observability, and reliability of GraphQL services Support integration with enterprise and legacy systems Required Skills & Qualifications For 5+ Years (Engineer Level) 5+ years of experience in backend/API development Strong hands‑on experience with GraphQL (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/NoSQL) Experience with version control (Git) and CI/CD pipelines For 10+ Years (SME Level) 10+ years of experience in API architecture and integration Deep expertise in GraphQL 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 Nice to Have Experience with GraphQL Federation / Apollo Gateway Knowledge of cloud platforms (AWS, Azure, or GCP) Exposure to DevSecOps practices Familiarity with federal standards (e.g., security, accessibility, data privacy) #J-18808-Ljbffr Stackular