Backend Software Engineer

1. About the Company Theori is an AI-first cybersecurity company developing next-generation security platforms. Its technology includes Xint, an autonomous penetration testing framework designed to support AI-driven security testing and real-time vulnerability discovery. Theori's engineering team focuses on solving complex systems challenges while building scalable, reliable, and secure technology for modern cybersecurity applications. 2. About the Role Theori is seeking an experienced Backend Software Engineer to help architect and build the core backend systems powering its AI-driven cybersecurity platforms. As part of the North American engineering team, you will work on distributed backend systems, APIs, data pipelines, and infrastructure supporting LLM agent workflows and real-time security scanning. This is a foundational engineering role for someone who enjoys solving complex technical problems, designing systems for scale and reliability, and taking ownership from design through deployment. The ideal candidate has strong Python backend development experience, with expertise in technologies such as FastAPI, Redis, PostgreSQL, and Docker. 3. Key Responsibilities Architect, develop, and maintain backend services and APIs supporting Theori's AI-driven security platforms. Design distributed systems for performance, scalability, reliability, and fault tolerance. Develop secure, well-structured APIs in collaboration with product and frontend engineering teams. Build and optimize data pipelines supporting LLM agent workflows and real-time scanning. Establish backend engineering standards, coding practices, and CI/CD processes for the growing US engineering team. Develop clean, well-tested, maintainable Python code and related backend technologies. Design and optimize production systems for performance and reliability. Contribute to backend architecture and technical decision-making as product requirements evolve. Drive projects independently from system design through implementation, testing, and deployment. Mentor junior engineers and contribute to a collaborative, high-quality engineering culture. Help establish scalable engineering practices within an early-stage, AI-first environment. 4. Required Qualifications 5+ years of professional software engineering experience building production systems. Strong proficiency in Python. Proven experience developing reliable backend services, preferably using FastAPI. Strong understanding of system design, distributed architectures, and performance optimization. Hands-on experience with Redis, PostgreSQL, and Docker-based environments. Familiarity with AI/LLM-driven workflows or asynchronous and event-driven architectures. Ability to work effectively in an early-stage environment with evolving requirements. Self-directed approach with strong ownership and project execution skills. Ability to drive projects from design through deployment. Must be based in the United States or Canada. 5. Preferred Qualifications Experience with Rust. Background in cybersecurity, application security, penetration testing, or vulnerability analysis. Knowledge of message queues, task orchestration, or microservices. Familiarity with LLM integration, Retrieval-Augmented Generation (RAG) pipelines, or vector databases. Experience working in startups or B2B SaaS environments. Experience building or scaling distributed systems. Experience contributing to or scaling engineering teams. Familiarity with modern AI security and autonomous security-testing workflows. 6. Benefits & Perks Compensation & Benefits Competitive salary plus equity Health, dental, and vision insurance Generous PTO policy Remote work Laptop provided Home office stipend Engineering Culture Opportunity to ship high-impact features Modern Python-based technology stack including FastAPI, Redis, PostgreSQL, and Docker Strong focus on testing and engineering quality Clear documentation and development processes Collaborative, low-ego team environment Career growth and mentorship opportunities Work-Life Balance Flexible working hours Remote-first culture Focus on outcomes rather than hours worked 7. Equal Opportunity Statement The provided job details do not include a specific Equal Opportunity Statement for Theori. No additional company-specific equal opportunity language has been added.