Top Tech Jobs & Startup Jobs in Denver & Boulder, CO

As a Senior Sales Executive (Federal) at SimSpace, you will drive new business development across U.S. Federal agencies, focusing on cybersecurity and AI technologies, building pipeline, and closing complex sales deals.

Lead architecture and delivery of scalable, fault-tolerant microservices for a cyber range emulation platform. Design AI/agent integration, event-driven systems, and observability. Drive cross-functional roadmaps, mentor engineers, set technical standards for security-first engineering, and improve reliability, performance, and operational maturity for high-fidelity attack and user emulation.

Manage technical delivery of cyber range engagements: coordinate environments, lead exercise planning and execution, support AI agent training/validation, liaise between customers and Professional Services, document outcomes, and maintain customer relationships. Travel up to 25%.

Technical lead to design and build an eBPF-based kernel-level internet simulation and control plane. Own XDP/TC hooks, BPF maps, topology database, and lightweight in-range agents. Mentor engineers, set architecture, and productionize a proof-of-concept for multi-tenant cyber range network simulation with realistic ASN routing and traceroute fidelity.

Technical lead for an eBPF-based internet simulation platform: design kernel-space XDP/TC simulation, build control-plane topology database, architect lightweight in-range agents, enable runtime topology updates, mentor engineers, and drive architecture and operational integration for multi-tenant cyber range deployments.

Lead and grow a full-stack application engineering team delivering end-to-end product features (React frontend, Kotlin-backed services). Own hiring, coaching, delivery, architecture, technical debt, quality, and cross-team execution. Drive product-aligned priorities, unblock hard problems, improve processes, and ensure operational ownership and predictable delivery.

Own architecture and technical strategy for authentication and authorization. Design and build Keycloak-based identity infrastructure and ReBAC authorization using Topaz/OPA. Develop IAM-adjacent services (directory, user management), establish cross-team authn/authz standards, drive technical roadmaps, scope projects, mitigate security and performance risks, perform architectural reviews, and mentor senior engineers.

Lead architecture and implementation of authentication and authorization across the platform. Build and operate Keycloak-based identity infrastructure, ReBAC authorization with Topaz/OPA, directory and user-management services, define cross-team authn/authz standards, mentor engineers, and drive technical roadmaps, risk mitigation, and secure, multi-tenant designs.

As a Cyber Range Engineer, design and manage computer networks, configure security tools, and troubleshoot IT systems while collaborating with clients and teams.

Contract Hiring Partner to manage full lifecycle recruiting across technical and nontechnical functions. Source active and passive candidates, build talent pipelines, maintain recruiting operations and data, support onboarding, and partner with hiring managers to improve processes and candidate experience over a six-month remote engagement.