Software Engineer, Full Stack at Mantle | CA, US | Rezi

Software Engineer, Full Stack at Mantle

Software Engineer, Full Stack

Mantle · CA, US

2 weeks ago

Software Engineer, Full Stack

Mantle · CA, US

19 days ago
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About the Role

As Founding Software Engineer, you'll architect and build our consumer-facing platform from the ground up. Your job is to create exceptional web experiences that customers love, while integrating AI agents that handle complex family tasks automatically. You'll own significant parts of our technical infrastructure, work directly with founders on product direction, and make architectural decisions that will scale with millions of users.

Responsibilities

  • Architect and build our consumer-facing platform from the ground up.
  • Create exceptional web experiences that customers love.
  • Integrate AI agents that handle complex family tasks automatically.
  • Own significant parts of our technical infrastructure.
  • Work directly with founders on product direction.
  • Make architectural decisions that will scale with millions of users.
  • Build consumer-facing web/mobile application: onboarding flows, user dashboards, account management, and all the core web functionality families interact with daily.
  • Develop AI agent experiences that integrate seamlessly into the web product.
  • Build robust, scalable infrastructure on AWS supporting both traditional web features and AI workloads.
  • Implement payment flows, data visualizations, notification systems, and real-time user interfaces.
  • Create integration layers connecting AI models, third-party services, and internal systems into cohesive user experiences.
  • Develop internal tools and admin interfaces to support operations and customer success.
  • Build data pipelines and monitoring systems to track product performance and improve the agent over time.

Requirements

  • 2-10 years building production full stack web applications with modern technologies.
  • Demonstrated ability to architect scalable systems.
  • Track record of shipping consumer products end-to-end, from concept to production.
  • Experience building consumer web applications where UX, performance, and reliability matter.
  • Background building features across the full product spectrum - from landing pages to complex interactive workflows.
  • Understanding of product development and user-centric design.
  • Comfortable working with AI/ML APIs and integrating LLMs into product experiences.
  • Experience with FinTech is nice to have, but not required.

Skills

  • React
  • Node.js
  • AWS (ECS, Lambda, RDS, S3, etc.)
  • AI/ML APIs
  • LLMs

Location

  • San Francisco

Work Type

  • Remote Fridays
  • In-person Monday through Thursday

Experience Level

  • Founding Software Engineer
  • Early-stage startup experience (especially as a first-10 engineer)

Benefits

  • Meaningful work: Build a consumer product that will improve the lives of millions of families, with real technical ownership, fast pace, and huge financial potential.
  • Small team impact: Work directly with founders and see immediate impact from your work.
  • Founding team equity: Significant ownership in a company targeting a massive market.
  • Shape the future: You will own all things data science; your decisions will shape our product, business and culture.
  • Learning & growth: Exposure to every aspect of building a startup from the ground up.

About the Company

  • We’re building an AI agent to help families support their aging parents.
  • Over 40M “sandwich generation” Americans currently manage their parent’s affairs.
  • Keeping mom/dad safe and supported is like a second job: it’s time-consuming, stressful and on top of their already busy lives.
  • We believe that managing our parents’ affairs should feel under control, easier and lower stress.
  • Co-founded by serial entrepreneur partners including Ted Zagat, who sold his previous businesses to Slack and Google.