Senior Fullstack Engineer
- Compensation
- CRC 1.5M–CRC 2.5M / mo
- Location
- Remote - Costa Rica
- Work setup
- Remote
- Seniority
- Senior
- Employment
- Not specified
- Experience
- Not specified
- Category
- Fullstack
- Posted
Skills
Must have
- Strong experience building production web applications with React and TypeScript
- Experience designing and delivering complex operator interfaces, administrative consoles, infrastructure-management products, or other workflow-heavy applications
- Strong frontend architecture skills, including component design, application state management, data fetching, routing, forms, validation, and error handling
- Experience integrating frontend applications with RESTful or similar platform APIs
- An understanding of asynchronous and distributed-system behavior and the ability to represent long-running operations, partial failures, retries, and eventual consistency clearly in a user interface
- Backend development experience, preferably with Kotlin and Spring Boot, or the ability to become productive in that stack
- Experience collaborating on API schemas and contracts with backend engineers
- Strong testing practices across unit, component, integration, and end-to-end testing
- Familiarity with authentication, authorization, secrets handling, and secure frontend development
- Experience instrumenting applications so that failures can be diagnosed across browser, API, and backend service boundaries
- Strong product and user-experience instincts, particularly when simplifying technically complex workflows
- Clear communication skills and the ability to work closely with engineers across frontend, backend, infrastructure, and operations
Full description
SimSpace serves as an AI Proving Ground where organizations can confidently train, test, and outmaneuver adversaries in any environment. Trusted by allied governments, militaries, enterprises, and research institutions worldwide, SimSpace enables adaptive, AI-ready defenses that stay ahead of evolving threats. Founded in 2015 by experts from U.S. Cyber Command and MIT Lincoln Laboratory, the platform unifies training, testing, and validation in a realistic, live-fire simulation—helping teams evaluate security investments, optimize performance, and compress cyber readiness cycles from months to days.
Why join SimSpace? We are an organization that is focused on building our culture and mindfully enhancing our atmosphere every day which is why we have collaborated on an integral value system. Our governing philosophy of being Human Centered is deeply embedded within our value system. We apply this philosophy to every one of our internal team members, external clients, and their customers.
How Do We Work? We believe that people are at the center of everything we do. SimSpace fosters a culture of continuous learning, curiosity, and professional growth. That belief shows up in action: in-house training, internal and external learning platforms, cyber conferences, industry events, and dedicated time for skill development. Our people are empowered to shape their careers - and it shows. Year over year, SimSpace consistently outperforms industry benchmarks in internal mobility, promotions, and total rewards growth.
Who Thrives Here? We are a team of innovators, protectors, and problem-solvers. We believe diversity of thought and experience fuels better solutions, and we’re committed to building teams that reflect the communities we serve. Whether you’re remote or office-based, you’ll collaborate with talented colleagues across departments and time zones, united by the mission to create a safer digital world.
We invite you to apply today!
We are looking for a Senior Full Stack Engineer to build the operator experience for SimSpace’s internet simulation platform. This engineer will turn the platform’s control-plane capabilities into intuitive workflows for configuring simulated services, registering personas, managing topology, provisioning applications, integrating ranges, and monitoring platform state.
The role will work closely with the backend engineer who owns the control-plane API, event-driven orchestration, persistence, and deployment model. While the primary focus will be building the frontend experience in React and TypeScript, this engineer will also contribute to backend services and integration layers where needed. The ideal candidate is comfortable moving across the stack, translating complex distributed-system behavior into clear user experiences, and building interfaces that remain understandable when operations are asynchronous, long-running, or partially successful.