Senior Software Engineer, Backend

Sentra is hiring a Senior Backend Engineer to build customer-facing products and AI-powered systems. The role owns end-to-end product delivery, designs LLM agents for complex organizational data, and helps shape technical architecture and product direction alongside the founding team.

Responsibilities:

• Own and ship product features end-to-end, from problem scoping and backend implementation to production deployment
• Design and build LLM agents that reason over large, complex organizational data and deliver reliable results
• Make key technical decisions across architecture, data modeling, API design, tooling, and engineering quality
• Lead ambiguous, high-impact projects with minimal oversight
• Shape product direction alongside the founding team and translate customer needs into technical solutions
• Work closely with the founding team on customer engagements supporting organizations ranging from hundreds to thousands of employees
• Take ownership of the product, codebase, and technical decisions in a fast-moving startup environment

Requirements:

• 5+ years of backend engineering experience focused on customer-facing products
• Experience at a top-tier startup (Series B or earlier) or as a founder
• Proven track record of building and shipping production-grade, customer-facing backend products at scale
• Deep expertise in Python for production backend systems
• Strong backend architecture and systems design skills
• Proficiency in API design and SQL-based data stores
• Hands-on experience building with large language models (LLMs) or agentic AI systems
• Ability to set technical direction and deliver high-impact projects independently
• A generalist engineering mindset, with the ability to contribute across the product rather than focusing exclusively on infrastructure
• Strong product judgment and the ability to connect engineering decisions to customer and business outcomes
• Direct experience working with customers
• Proficiency with AI coding tools and the ability to use AI to accelerate development while maintaining strong independent technical judgment
• Candidates should have existing work authorization in the United States or Canada. Visa sponsorship is not generally preferred, although exceptional candidates may be considered