Staff Software Engineer, Greyspace

SimSpace provides an AI proving ground for organizations to train, test, and improve cyber defenses through realistic live-fire simulations. The Staff Software Engineer, Greyspace will lead the architecture and development of simulated internet environments, including distributed services, networking behavior, platform integrations, operator workflows, and operational readiness.

Responsibilities:

• Greyspace service architecture, APIs, and orchestration for configuring and managing simulated internet environments
• Realistic network and application behavior, including DNS, TLS, web, and mail services
• Reusable services and content with isolated per-range configuration, identities, and mutable state
• Platform and range integrations, operator workflows, automated validation, and operational readiness
• Lead Greyspace architecture and technical decisions, defining service boundaries, data ownership, API contracts, and failure behavior with partner teams
• Design and build the services that configure, deploy, and manage simulated internet environments. Own critical implementation work and help turn prototypes into maintainable, tested software
• Develop realistic network and application behavior across DNS, certificates, routing, and services such as web and mail. Validate complete workflows from a range host through the simulated service and back
• Design for reuse across ranges while isolating configuration, credentials, mutable state, and faults. Work with Security and infrastructure partners to test containment and prevent unintended access between environments or to live networks
• Define versioned integration contracts with platform, range, and emulation teams. Partner on operator workflows for configuration, readiness checks, troubleshooting, and lifecycle management
• Partner with Product and technical leaders to translate training needs into prioritized use cases, explicit acceptance criteria, and incremental delivery plans
• Lead scoping and estimation, making assumptions, dependencies, and trade-offs explicit. Break ambiguous work into useful milestones and validate high-risk decisions with focused technical proofs
• Drive reliability and operational readiness through automated integration tests, observability, performance testing, recovery procedures, and deployment and upgrade validation for hosted and on-premises environments
• Lead design and code reviews, resolve cross-service technical risks, and establish practical engineering standards that support reliable delivery
• Mentor senior engineers through hands-on collaboration, sharing expertise in distributed systems, networking, testing, and technical decision-making

Requirements:

• 8+ years' of experience and currently in the position of Staff or Senior Software Engineer with a strong record of building distributed applications, platform services, or networked systems and leading technically complex work across teams
• Proven ability to design, build, and ship production-grade distributed services — comfortable owning the full software development lifecycle from architecture through delivery
• Strong networking fundamentals, including TCP/IP, DNS, HTTP, and TLS, with hands-on experience diagnosing behavior across application, service, and network boundaries
• Experience designing multi-tenant or distributed systems with clear isolation, state management, API, and failure-recovery boundaries
• Demonstrated ability to drive technical standards and architectural decisions across multiple teams, balancing idealism with pragmatic delivery
• Strong scoping and estimation judgment: able to produce an early estimate, identify uncertainty and dependencies, and break a large initiative into testable milestones. Helps teams make commitments grounded in evidence and available capacity
• Strong communicator who can explain complex architecture, networking behavior, and engineering trade-offs to technical and non-technical audiences
• Proficient in a modern backend programming language and software engineering practices including API design, service decomposition, automated testing, code review, and CI/CD
• Hands-on experience with Linux, containers, and Kubernetes, including deploying and troubleshooting services
• Comfortable operating with ambiguity — at the Staff level, the roadmap isn't always fully defined, and this role is expected to help shape it. We're looking for someone who drives clarity rather than waiting for it
• Familiarity with cyber ranges, simulation, or internet service infrastructure is a plus
• Experience with self-hosted, on-premises, or disconnected environments is a strong plus
• Experience working in security-sensitive or compliance-driven environments (DoD, FedRAMP, SOC 2, or similar) is a strong plus