Senior Software Integration Engineer-API Design

KBR, Inc. • Beavercreek, OH

2d • Hybrid

About The Position

KBR’s National Security Solutions team provides high-end engineering and advanced technology solutions to our customers in the intelligence and national security communities. In this position, your work will have a profound impact on the country’s most critical role – protecting our national security. KBR is seeking a highly experienced Senior Software Integration Engineer to join our team in Beavercreek, OH. The ideal candidate will be expert in API web design with a Secret DoW clearance.

Requirements

• 5–8+ years in API design/integration; strong OpenAPI, JSON Schema, protobuf/gRPC, and GraphQL experience
• Security: OAuth2/OIDC, JWT, mTLS, policy enforcement; experience with gateway technologies
• Data modeling, metadata/lineage design, and auditability for regulated domains
• Active DoW Secret clearance

Nice To Haves

• Experience integrating legacy/constructive simulation systems into modern API ecosystems
• Event streaming (Kafka/NATS) for asynchronous workflows and telemetry
• Comfortable designing interfaces for multi‑classification operations
• Active Top Secret clearance with SCI eligibility

Responsibilities

• Define and govern the API‑first contracts that modularize the simulation core and onboard legacy tools as modern services
• Ensure transparency, repeatability, and security across all integrations (tools, data, metadata, orchestration)
• Design REST/gRPC APIs and GraphQL schemas for simulation core services: timing, state‑of‑play, user input, orchestration
• Lead API governance: versioning, schema evolution (OpenAPI/JSON Schema/proto), deprecation policy, and documentation
• Wrap existing simulation/wargaming tools as secure web services via SDKs; standardize authentication/authorization (OIDC/JWT) and mTLS
• Implement API gateway patterns: routing, rate limiting, quotas, request validation, and zero‑trust controls
• Model metadata & lineage: tagging of tools/inputs/results; expose reconciliation endpoints for VV&A, fidelity compatibility assessment, and repeatability

Benefits

• KBR offers a selection of competitive lifestyle benefits which could include 401K plan with company match, medical, dental, vision, life insurance, AD&D, flexible spending account, disability, paid time off, or flexible work schedule.
• We support career advancement through professional training and development.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 5,001-10,000 employees