Senior Software Engineer – Networking

🔥 13 hours ago

🇺🇸 United States – Remote

💵 $160k - $225k / year

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

🦅 H1B Visa Sponsor

This company has sponsored H1B visas in the past.

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SimSpace

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2015

💼 Consulting

🎖️ Defense

🔒 Cybersecurity

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

Consulting • Defense • Cybersecurity

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 develop a realistic, simulated internet for SimSpace cyber ranges • Own Greyspace service architecture, APIs, orchestration, service boundaries, data ownership, API contracts, and failure behavior • Build services that configure, deploy, and manage simulated internet environments • Develop realistic network and application behavior across DNS, certificates, routing, web, and mail services • Validate workflows from a range host through simulated services and back • Design reusable services with isolated configuration, credentials, mutable state, and faults across ranges • Test containment and prevent unintended access between environments or to live networks • Develop versioned integration contracts with platform, range, and emulation teams • Partner on operator workflows for configuration, readiness checks, troubleshooting, and lifecycle management • Translate training needs into prioritized use cases, acceptance criteria, and delivery plans • Scope and estimate projects, identify dependencies and trade-offs, and break ambiguous work into milestones • Drive reliability through integration tests, observability, performance testing, recovery procedures, and deployment and upgrade validation • Participate in design and code reviews and resolve cross-service technical risks • Mentor engineers in distributed systems, networking, testing, and technical decision-making

🎯 Requirements

• 5+ years of software engineering experience • Strong experience building distributed applications, platform services, or networked systems • Proven ability to design, build, and ship production-grade distributed services • Strong networking fundamentals, including TCP/IP, DNS, HTTP, and TLS • Hands-on experience diagnosing behavior across application, service, and network boundaries • Experience designing multi-tenant or distributed systems with isolation, state management, API, and failure-recovery boundaries • Strong technical decision-making and cross-team collaboration • Strong scoping and estimation judgment • Ability to communicate complex architecture, networking behavior, and engineering trade-offs to technical and non-technical audiences • Proficiency in a modern backend programming language • Experience with API design, service decomposition, automated testing, code review, and CI/CD • Hands-on experience with Linux, containers, and Kubernetes, including deploying and troubleshooting services • Ability to operate with ambiguity and clarify requirements • U.S. work authorization required; must verify identity and eligibility to work in the United States upon hire

🏖️ Benefits

• Annual bonuses tied to company performance and individual contributions • Comprehensive medical, dental, and vision benefits • Savings plans • Company-paid counseling, coaching, and family resources through Spring Health • 401(k) retirement savings plan with company match • Unlimited vacation • Dedicated health and wellness days • Flexible work-life solutions • Paid parental leave • Equity stock options at hire • Annual performance-based equity grants • $1,500–$3,500 employee referral rewards for every qualified hire • Full- and partial-subsidized Peloton membership plans • Peloton equipment discounts • LinkedIn Learning membership • Monthly reimbursements for teammate connections through SocialSpace Community • Legal plan coverage • Pet insurance • Wellness reimbursements

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