Staff Software Engineer - Mobile

About Us

Leona is on a mission to empower everyone to take the best care of themselves, their patients, and their loved ones. We have an ambitious goal : to transform the way the world interacts with healthcare. We strongly believe that where you live shouldn’t impact your access to high-quality care. For patients, it should feel empowering, and unintimidating, to proactively take care of yourself and your loved ones. For doctors, we want to enable you to focus on what matters most, delivering the best possible care, by providing better tooling, decreasing the administrative burden, and helping you to prioritize based on urgency and complexity while saving time and improving clinician quality of life.

We are reimagining how doctors provide care for their patients in an AI-first world. Our first product is a platform that streamlines Doctor-Patient communication via WhatsApp. Leona is designed to act as a doctor’s AI clinical assistant, automating and delegating non-urgent tasks, while allowing patients the convenience of reaching their doctors 24 / 7 via WhatsApp.

With bases in San Francisco and Mexico City, our diverse team brings together years of experience scaling tech companies like Rappi, Uber, Modern Fertility and Wonder throughout the US and Latin America. Leona is backed by top-tier investors such as General Catalyst, and Accel, as well as an incredible list of angel investors including the founders of Nubank, Rappi, Maven Clinic, and other successful technology companies.

If you are hungry to learn and build 0-1 at an early stage startup, while rolling up your sleeves to make some magic, this role might be the perfect fit for you!

We’re looking for an experienced software engineer to help shape and scale the doctor-patient communication platform we’ve built. If you’re driven by tough engineering and user experience challenges, love wearing many hats, and thrive in taking products from 0 to 1, this role is for you.

In this role, you will :

Take full ownership of projects that are both technically complex and business-critical

Optimize app performance, scalability, and maintainability across web, iOS and Android platforms

Collaborate closely with design, operations, data science, and medical professionals to deliver impactful product experiences

Work as part of our engineering team to evolve our engineering strategy and improve how we build

Help shape technical direction and product decisions as a core member of a small, high-performing team

Collaborate with the team to bring AI-enabled features from concept to production

What we’re looking for :

6+ years of professional experience in mobile development, with at least 2+ years in Flutter

Deep understanding of Dart and state management solutions (e.g., Provider, Riverpod, BLoC, Redux)

Strong experience integrating RESTful APIs, WebSockets, and third-party SDKs

Proven experience in CI / CD, automated testing, and performance optimization

Familiarity with mobile security, app store deployment, and best practices for scalability

Excellent communication and collaboration skills

A builder’s mindset and love for creating things that make a difference

We’d love to work with someone who :

Thrives in ambiguity and fast-moving environments

Loves collaborating with talented cross-functional teammates

Builds with a user-first mindset, ensuring every feature feels intuitive and polished

Is energized by the challenges (and opportunities) of early-stage startups

Is mission-driven and passionate about improving health outcomes

Is curious, resourceful, and always looking to innovate

Bonus points for :

Experience in health tech or building communication tools (messaging, collaboration, etc.)

Spanish fluency

Contributions to open-source Flutter projects or active involvement in the Flutter community

Experience working in a fast-paced startup environment

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