Full Stack React Native Engineer

San Bruno, California

Mill is all about answering a simple question: how can we prevent waste? Less waste can save time, money, energy, maybe even our planet. And there’s no better place to start than food. Food waste is one of the most solvable climate problems facing us today. Plus, our trash really stinks. It’s gross, heavy, and our least favorite chore. At Mill we are striving to build a better environment for all, as we take on climate and kitchen change.

We’re looking for a Full Stack React Native Engineer to join our Product Applications team—responsible for building and maintaining our end-to-end applications across mobile, web, cloud, and data systems. You’ll work closely with a cross-functional team of engineers, designers, and product managers to build seamless and impactful user experiences. This role will have a major influence on both technical architecture and product strategy.

What You’ll Do

  • Lead the end-to-end technical delivery of features—from architecture and design through implementation, testing, deployment, and operations.
  • Build and maintain scalable, performant applications using React Native for mobile and full stack technologies across the web and backend.
  • Collaborate with product and design teams to create intuitive and polished user experiences.
  • Drive best practices in modern software engineering: CI/CD pipelines, Infrastructure as Code (IaC), observability, performance monitoring, and testing automation.
  • Help shape our mobile app strategy, including build automation, app release cycles, and feature flag management.
  • Design reliable, fault-tolerant APIs and contribute to secure, maintainable, and observable backend systems.
  • Mentor junior engineers and contribute to a culture of growth, ownership, and continuous learning.

Minimum Qualifications

  • 3–5+ years of experience as a full stack engineer with exposure to both frontend (especially mobile) and backend systems.
  • Proficiency with React Native, Redux, and TypeScript, with experience shipping mobile apps to the App Store and Google Play.
  • Strong backend development skills, ideally using Python.
  • Hands-on experience working with cloud platforms such as AWS, Azure, or Google Cloud Platform.
  • Experience with Infrastructure as Code tools (e.g., CDK, Terraform) and cloud-native services (e.g., API Gateway, serverless functions, managed databases).
  • Solid understanding of API design, asynchronous communication patterns, and robust error handling.
  • Familiarity with CI/CD systems (e.g., GitHub Actions, CircleCI), build tooling, and code quality enforcement (e.g., linters, formatters, testing frameworks).
  • Passion for system reliability, including observability, alerting, tracing, and performance optimization.
  • Excellent communication skills and comfort working in a collaborative, product-focused environment.

Preferred Skills

  • Deep mobile experience: Native Modules, Bluetooth Low Energy (BLE), deep links, react-navigation, Tailwind CSS, websockets, and Fastlane.
  • Experience with feature flagging systems such as LaunchDarkly or Eppo.
  • Experience building production-grade serverless applications and working with real-time data or IoT integrations.
  • Familiarity with AWS IoT or equivalent cloud IoT services.
  • Experience designing role-based access control (RBAC) systems.
  • Awareness of compliance frameworks such as ISO 27001, SOC 2, GDPR, or CPRA.

The estimated base salary range for this position is $140k to $175k, which does not include the any benefits or equity. Various factors are considered in making compensation decisions, including but not limited to experience, training, licensure and certifications, and business and organizational needs.

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