Backend Software Engineer – Internet Services Simulation

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SimSpace

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2015

🔒 Cybersecurity

☁️ SaaS

🏛️ Government

🔥 Funding within the last year

💰 $39M Venture Round - SimSpace on 2025-10

Cybersecurity • SaaS • Government

SimSpace is a cybersecurity company that provides a realistic, intelligent cyber range platform for training, testing, and validating security teams, tools, and AI agents. Its platform enables live-fire exercises, threat emulation (full kill-chain and atomic), validation of controls and agentic workflows, and disaster recovery and compliance testing; it is used by enterprises and government customers to build cyber readiness and resilience. Founded by experts from U. S. Cyber Command and MIT Lincoln Laboratory, SimSpace focuses on upskilling individuals, strengthening teams, and evaluating AI-driven defenses in realistic, production-like simulations.

📋 Description

• Design and operate the Kubernetes-based deployment automation for the simulated service catalog, including deployment configuration for each service type, health monitoring, and lifecycle management. • Build and maintain content seeding pipelines that scrape, transform, and inject realistic content into simulated services — making a fake code repository look like it has years of commit history, or a fake news site look like it has been publishing for months. • Own the external DNS layer: configure and operate authoritative DNS for all simulated domains, ensure correct mail and sender authentication records are generated at domain provisioning time, and maintain consistency between DNS state and deployed services. • Build and maintain the email delivery infrastructure that allows the internet simulation platform to send mail into range environments, including correct envelope construction, authentication headers, and support for adversarial email scenarios. • Collaborate with the identity and persona team to ensure simulated services are correctly provisioned with user accounts at persona registration time and that per-service user state remains consistent with the broader persona definition. • Instrument and monitor the simulated service catalog, building observability into service health and range-level activity using the platform's Grafana-based stack. • Contribute to the service API layer that allows other platform components and external orchestration systems to create and manage simulated services programmatically.

🎯 Requirements

• Strong bilingual proficiency in English and Spanish skills required across written, virtual, and in-person interactions. • Solid experience deploying and operating containerized services in Kubernetes, including writing deployment configuration and automation for a heterogeneous set of applications. • Hands-on experience with self-hosted open-source platforms — you have run your own mail server, stood up a social media instance, or operated similar infrastructure and understand the configuration complexity involved. • Working knowledge of DNS — not just querying it, but operating authoritative nameservers, understanding zone delegation, and configuring records for email authentication. • Familiarity with email delivery infrastructure: how mail servers work, how sender authentication is constructed, and what makes an email appear legitimate to receiving infrastructure. • Experience with web scraping, data transformation pipelines, or content generation. • Comfort working across a broad, heterogeneous service catalog — this role rewards generalist depth across many technologies over deep specialization in one. • Familiarity with PKI and TLS fundamentals is a plus — understanding how certificate trust chains work and how clients are configured to trust custom certificate authorities. • Experience in cybersecurity, red team infrastructure, or cyber range environments is a plus.

🏖️ Benefits

• Private medical, dental, vision, and life benefits. • Access to company-paid counseling, coaching, and resources for you and your family through Spring Health. • Paid leave plans to support you and your loved ones during life’s most important moments. • Equity stock options at hire, with annual performance-based grants—become an invested stakeholder in our shared success. • Access a LinkedIn Learning membership to prioritize your personal and professional development. • Monthly reimbursements for meaningful connections with teammates through our SocialSpace Community.