Senior Software Integration Engineer-API Design

Senior Software Integration Engineer - API Design

Join to apply for the Senior Software Integration Engineer - API Design role at K , Inc.

K ’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.

• Innovative Projects: K ’s work is at the forefront of engineering, logistics, operations, science, program management, mission IT and cybersecurity solutions.
• Collaborative Environment:
  Be part of a dynamic team that thrives on collaboration and innovation, fostering a supportive and intellectually stimulating workplace.
• Impactful Work:
  Your contributions will be pivotal in designing and optimizing defense systems that ensure national security and shape the future of space defense.

K  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.

• 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 Graph
  
  QL 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

• Location:
  
  On-site/Hybrid/Remote
• Travel Requirements: 15%
• Working Hours:
  
  Standard

Required:

• 5–8+ years in API design/integration; strong OpenAPI, JSON Schema, protobuf/gRPC, and Graph
  
  QL 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

Desired:

• 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

If you’re excited about making a significant impact in the field of space defense and working on projects that matter, we encourage you to apply and join our team at K . Let’s shape the future together.

K  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.

Belong, Connect and Grow at K .

K  is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, disability, sex, sexual orientation, gender identity or expression, age, national origin, veteran status, genetic information, union status and/or beliefs, or any other characteristic protected by federal, state, or local law.

R2117255