Software Engineer

Rockstar is recruiting for a high-growth AI startup that is the market-leading AI voice agent for mortgage lenders. Founded in 2024, the company has grown rapidly and currently counts 5 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. The company is well-funded and at the cutting edge of AI-driven economic transformation. Location: San Francisco, CA (Hybrid) Employment Type: Full time Department: Engineering Compensation: $180K – $300K • Offers Equity About the Company The company is the market-leading AI voice agent for mortgage lenders. Founded in 2024, it has grown like crazy (~$0 to $13M in 20 months), and currently counts 5 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. If the company is successful, the cost of owning a home in the US will become ~1% cheaper. The company has raised $21M across its 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. The company is 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, the company will own the relationship with the consumer, allowing it to serve as the essential AI infrastructure for high consideration consumer sales. Why Join Crazy growth: The market pull is exhilarating — the company has grown 10x in the past 12 months and more than 100x since its 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. Team and Culture: The company is 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, the team doesn't take itself too seriously. 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. The company owns the whole stack and does not compromise on quality. Well-funded: The company has raised $21M+ in total funding, most recently a $15M Series A in June 2026. What You'll Do Work with the product team to translate customer requirements into highly scalable and maintainable software architecture Use AI coding agents and internal tooling to deliver new features and improve existing code Own one or more of the company's core software components end-to-end, from architecture and implementation to reliability in production. Examples include: simulation and evaluation system of the AI agents; A/B testing framework; SMS capabilities of the agents; voice orchestration infrastructure; phone number management; outbound strategy, call scheduler and dialer; agent orchestration framework; agent management framework; security and privacy services What We're Looking For Deep understanding of common software design patterns and best practices Experience using AI coding tools or agents to ship maintainable, clean code Excellent technical communication skills Track record of owning and delivering major product features Expert knowledge of at least one major programming language Experience in high-growth startups, ideally at Seed through Series B 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 provided by the company Hybrid in-office schedule: four days a week together in SF, with a flexible remote day on Wednesdays