Founding Security Infrastructure Engineer

Sela AI•San Francisco, CA

9d•Hybrid

About The Position

Sela is the market-leading AI voice agent for mortgage lenders. Founded in 2024, we’ve grown significantly and currently count 5 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. The company is at the cutting edge of AI disruption in the sales industry, aiming to make homeownership more affordable. This role is crucial in building the secure AI infrastructure for high consideration consumer sales. The market pull for Sela's technology is immense, with rapid growth and a strong product-market fit. The team is composed of high-agency individuals who value collaboration and intensity, while also maintaining a lighthearted approach. The company is well-funded, having raised over $21M, including a $15M Series A in June 2026.

Requirements

3–6 years of experience in security, infrastructure, DevOps, or platform engineering
Experience working at an early-stage startup, ideally Seed through Series C
Hands-on experience securing and operating cloud infrastructure, ideally AWS
Strong understanding of IAM, networking, secrets management, encryption, logging, vulnerability management, and cloud security best practices
Experience implementing security controls directly, not just defining policies or requirements
Experience working with systems that handle sensitive customer or consumer data
Strong judgment and ability to prioritize the highest-impact security work without over-engineering
Comfortable operating independently in a fast-moving startup environment

Nice To Haves

Previous experience in fintech, financial services, AI software, or another regulated B2B software environment
DevOps, SRE, or infrastructure engineering background
Experience securing AI/LLM applications, agent workflows, or systems that process voice, SMS, or communications data
Experience partnering closely with product and engineering teams to design secure systems
Familiarity with Terraform or other infrastructure-as-code tooling, Kubernetes, CI/CD security, and cloud-native security tooling
Experience helping an early-stage company mature its security program as it moves upmarket

Responsibilities

Define and continuously improve our security and privacy program
Implement security best practices across cloud infrastructure, applications, and internal systems
Build secure patterns and controls for internal AI agent use cases
Own identity, access, secrets, and privileged access controls
Lead customer security reviews and compliance efforts, including SOC 2 Type II
Manage third-party penetration testing and drive remediation of findings
Build technical controls to protect sensitive customer and consumer data across API, voice, and SMS systems