Founding Infrastructure Engineer

About Sela

Sela is the market-leading AI voice agent for mortgage lenders. Founded in 2024, we’ve grown like crazy (~$0->14M in 21 months), and currently count 6 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. If we’re successful, the cost of owning a home in the US will become ~1% cheaper. We’ve raised $21M across our Seed and Series A from top investors.

Why this is a huge opportunity

Around 1% of the U.S. labor force works in phone sales, representing roughly $100B of annual salary, and the industry is poised at the brink of complete disruption. We are at the cutting edge of this economic transformation, one of the first companies creating real, durable economic value through applied AI.

Buying a house is the largest financial decision most people make in their lives, and homeownership is tied to many other purchases, including life insurance, homeowners insurance, alarm systems, home renovations, solar panels, and more. By owning the mortgage vertical, we will own the relationship with the consumer, allowing us to serve as the essential AI infrastructure for high consideration consumer sales.

Why Join

1. Crazy growth: The market pull is exhilarating - we’ve grown 10x in the past 12 months and more than 100x since our seed round, all without a dedicated sales or marketing team. Building something that people want so badly is the best feeling you can have in a startup.

2. Team and Culture: We are a high-agency team where the bar is high and everyone makes the people around them better. Collaboration and intensity are core team values: people truly care about their work and their coworkers. At the same time, we don't take ourselves too seriously.

3. Challenging problems: Outperforming human sales teams on half a million daily calls is not easy. Low-latency, real-time infra. 99.9% uptime. Enterprise-grade privacy and security. Advanced simulation and evaluation systems. Flexible A/B testing. AI scheduler and dialer. We own the whole stack and we do not compromise on quality.

4. Well-funded: We’ve raised $21M+ in total funding, most recently a $15M Series A in June 2026.

What will you do

• Own security across our infrastructure, including identity, access, secrets, and encryption

• Own and scale our AWS infrastructure for real-time, low-latency voice systems

• Drive reliability, observability, and incident response to maintain 99.9% uptime

• Build and maintain infrastructure-as-code, Kubernetes, and CI/CD pipelines

• Build secure patterns for internal AI agent use cases

• Support customer security reviews and compliance efforts, including SOC 2 Type II

What are we looking for

• 5+ years of experience in infrastructure, DevOps, platform, or SRE roles

• Experience working at an early-stage startup, ideally Seed through Series C

• Hands-on experience building and operating cloud infrastructure, ideally AWS

• Strong understanding of IaC, Kubernetes, CI/CD, networking, and cloud security best practices

• Experience running production systems with high reliability requirements

• Experience working with systems that handle sensitive customer or consumer data

• Strong judgment and ability to prioritize without over-engineering

• Comfortable operating independently in a fast-moving startup environment

Nice to have

• Experience as a founding or first infrastructure hire

• Experience with real-time voice, telephony, or streaming systems

• Previous experience in fintech, financial services, or another regulated environment

• Experience leading SOC 2 or similar compliance efforts

• Experience securing AI/LLM applications or agent workflows

Benefits

• Top-of-market medical, dental, and vision coverage for you and your dependents

• 401(k) with a top-of-market employer match

• Unlimited PTO

• Snacks, weekly team lunches, and dinner on Sela

• Hybrid in-office schedule: four days a week together in SF, with a flexible remote day on Wednesdays