Senior Software Engineer – Core Services

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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 implement core platform services in Kotlin, building the abstractions described above across diverse infrastructure targets. • Solve difficult integration challenges at the boundary between platform software and virtualization infrastructure. • Collaborate with Staff and Principal Engineers on architectural decisions. • Own features and components end-to-end — from design through implementation, testing, and production operation. • Support other engineering teams that depend on Core Services APIs and abstractions. • Identify and drive resolution of performance bottlenecks, reliability issues, and technical debt within the Core Services stack.

🎯 Requirements

• Strong bilingual proficiency in English and Spanish skills required across written, virtual, and in-person interactions. • Experienced software engineer with 5+ years of experience and a track record of building backend services and platform-level software — not application-layer or frontend work. • Proficient in Kotlin or a closely related JVM language (Java, Scala), with a strong understanding of JVM fundamentals, concurrency patterns, and modern language features. • Comfortable working at the systems level — you understand how software interacts with infrastructure, networking, and virtualization layers, and you can reason about problems that span those boundaries. • Experience with VMware or hypervisor technologies is a strong plus. Familiarity with cloud infrastructure (AWS, GCP, Azure) or private cloud platforms (OpenStack, Proxmox) is also valuable. • Solid understanding of distributed systems fundamentals — service communication patterns, consistency tradeoffs, and failure handling in environments where external dependencies don't always behave predictably. • Strong API design sensibility — you think about contracts, versioning, backwards compatibility, and the developer experience of the teams consuming your services. • Demonstrated ability to work autonomously on complex problems, breaking ambiguous requirements into clear implementation plans without needing every detail specified upfront. • Effective communicator who can articulate technical tradeoffs clearly, participate constructively in design reviews, and build trust across teams through reliability and follow-through.

🏖️ 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.