Senior Software Engineer - Frontend (Attack & User Emulation)

simspace-corporation; United States; Remote; USD 130,000 - 190,000; Full time

Job summary

SimSpace-corporation is seeking a senior frontend engineer to craft the primary control surfaces and dynamic visualizations for a cyber range platform used to configure, simulate, and analyze offensive security scenarios.

The role sits at the intersection of backend simulation, real-time telemetry, and AI agent communication, turning complex datasets into polished, human-in-the-loop web experiences.

Qualifications

• 6+ years shipping complex web apps.
• Deep React and TypeScript expertise with modern state management.
• Experience with real-time data streams (WebSockets, SSE) and integration with backend/AI protocols.
• Strong UI testing foundation and WCAG accessibility knowledge.
• Ability to balance UX polish, performance, and delivery speed.

Responsibilities

• Design, build, and maintain high-performance web applications with React/TypeScript.
• Lead end-to-end frontend execution for major features and real-time displays.
• Improve performance, reusability, test coverage, and accessibility across the app.
• Handle complex visualization problems and data-driven interfaces.
• Collaborate with UX designers and backend engineers to define API contracts.
• Conduct code reviews and mentor teammates.

Skills

React

TypeScript

Real-time data streams

WebSockets

SSE

UI testing

WCAG accessibility

State management

Performance optimization

Tools

Storybook

Figma

Docker/Kubernetes

Job description

Role overview

A senior frontend engineer is needed to build the primary control surfaces and dynamic visualizations for a cyber range platform used to configure, simulate, and analyze offensive security scenarios and realistic user personas. The position sits at the intersection of complex backend simulation capabilities, real-time telemetry, and AI agent communication, turning them into polished human-in-the-loop web experiences.

Responsibilities

• Design, build, and maintain high-performance web applications using React and TypeScript, with a focus on streaming interfaces and interactive visualization.
• Lead end-to-end technical execution for major frontend features, including real-time data displays (WebSockets, SSE) and AI/MCP protocol integrations.
• Improve client-side performance, code reusability, test coverage, and WCAG accessibility standards across the application.
• Tackle complex visualization problems involving large datasets, interactive network topology, and agentic workflows.
• Collaborate with UX designers on feasibility and partner with backend engineers to define API contracts and integration boundaries.
• Conduct thorough code reviews, champion frontend engineering standards, and mentor teammates.

Requirements

• 6+ years of professional experience shipping complex, scalable web applications.
• Deep expertise in React, TypeScript, modern state management, and web performance optimization.
• Hands-on experience integrating real-time data streams (WebSockets, SSE) and complex backend or AI protocols.
• Strong foundation in UI testing (unit, integration, E2E) and WCAG accessibility standards.
• Proven ability to weigh trade-offs between UX polish, performance, and delivery speed.

Nice to have

• Experience displaying ML/RL decisions, confidence metrics, or agentic behaviors in user interfaces.
• Familiarity with shared design systems (Storybook, Figma workflows) and complex data visualization libraries.
• Exposure to cybersecurity concepts, containerized development (Docker/Kubernetes), or CI/CD pipelines.