# Backend Software Engineer - Company: [Theori]() - Location: United States · Canada - Remote: Yes - Team: Engineering - Employment type: Full Time - Posted: June 4, 2026 ## Job description We’re looking for an experienced backend engineer to help build and scale the next generation of AI-driven cybersecurity platforms at Theori. You’ll play a key role in architecting and implementing core backend systems that power Xint, our autonomous penetration testing framework. This is a foundational role in our NA engineering team—ideal for someone who thrives on solving complex systems challenges, enjoys designing for scale and reliability, and wants to help define engineering excellence in a fast-growing, AI-first company. ### **Key Responsibilities** * Architect, develop, and maintain backend services and APIs that power Theori’s AI security platforms. * Design for performance, scalability, and fault-tolerance across distributed systems. * Collaborate with product and frontend engineers to define and deliver secure, well-structured APIs. * Build and optimize data pipelines supporting LLM agent workflows and real-time scanning. * Establish backend best practices, coding standards, and CI/CD processes for a growing US team. * Write clean, well-tested, and maintainable code in Python and related technologies. * Mentor junior engineers and contribute to a strong, collaborative engineering culture. ### **Requirements** * 5+ years of professional software engineering experience building production systems. * Strong proficiency in Python, with proven experience developing reliable backend services (FastAPI preferred). * Solid understanding of system design, distributed architectures, and performance optimization. * Experience with Redis, PostgreSQL, and Docker-based environments. * Familiarity with AI/LLM-driven workflows or asynchronous, event-based architectures. * Comfort working in an early-stage environment with evolving requirements. * Self-directed, ownership-oriented, and comfortable driving projects from design to deployment. * Based in US or Canada. ### **Nice to Have** * Experience with Rust. * Background in cybersecurity, application security, or vulnerability analysis. * Knowledge of message queues, task orchestration, or microservices. * Familiarity with LLM integration, RAG pipelines, or vector databases. * Prior experience in startups or B2B SaaS environments. * Previous involvement in building or scaling distributed systems or engineering teams. ### **What We Offer** Compensation & Benefits * Competitive salary + equity * Health, dental, and vision insurance * Generous PTO policy * Remote work * Laptop + home office stipend Engineering Culture * Ship features that matter * Modern Python-based stack (FastAPI, Redis, PostgreSQL, Docker) * Strong focus on testing and quality * Clear documentation and processes * Collaborative, low-ego team * Career growth and mentorship Work-Life Balance * Flexible hours, remote-first culture * Focus on outcomes, not hours ## Apply [Apply on Theori]() Canonical job page: