Senior Software Engineer (Backend) Full Time NEW

About Sela

Sela is the market-leading AI voice agent for mortgage lenders. Founded in 2024, we have experienced impressive demand for our product, and currently count 5 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. In just 18 months, we have grown from ~$0 to $8M in annualized revenue with a team of 15 and we currently make over 10 million calls per month.

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. Our product is inherently funny. Our AI agent talks to a lot of America; hilarity often ensues.
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

• 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 Sela’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 are we 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
• Dinner on the company any night you’re still in the office
• Hybrid in-office schedule: four days a week together in SF, with a flexible remote day on Wednesdays