Backend Software Engineer
At Theori · United States; Canada; United States of America
- Engineering
- Full-time
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Open to Canada and the United States
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- Posted
- 4 June 2026
- First seen by us
- 3 November 2026
- Last checked
- 9 hours ago
Job description
From Theori’s job post, as they wrote it.
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.
Read the full description
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
Backend Software EngineerTheori
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