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# Backend Software Engineer

- **Company:** Theori, Inc.
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Software System Penetration Testing, Cyber Security, Continuous Integration, Distributed Systems, Fault Tolerance, Design of User Interfaces, Human-Computer Interaction, Internet Security, Python (Programming Language), PostgreSQL, Performance Tuning, Queueing Systems, Redis, Software Engineering, Retrieval-Augmented Generation, Large Language Models, Software Security, Backend, Fastapi, Front End Software Development, Data Pipelines, Docker, Vulnerability Analysis, Microservices
- **Published:** November 7, 2026
- **Apply:** https://www.careerbuilder.com/job-details/backend-software-engineer--b2aea35e-ac77-4346-a039-625886ec021c

## About the Role

Software Engineering, Internet Security, Artificial Intelligence (AI), Penetration Testing, Application Programming Interface (API), Security Infrastructure, Distributed Computing, User Interface/Experience (UI/UX), Product Engineering, User Interface (UI) 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., * 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.

## Description

* 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.