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The Staff Software Engineer will take full ownership of technically complex and business-critical projects, optimizing app performance across web, iOS, and Android platforms. They will collaborate with various teams to deliver impactful product experiences and help shape the technical direction of the company.
Candidates should have 6+ years of professional experience in mobile development, including at least 2+ years in Flutter, and a deep understanding of Dart and state management solutions. Strong experience with RESTful APIs, CI/CD, and mobile security is also required, along with excellent communication skills.
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. Our first product is a platform that streamlines Doctor-Patient communication via WhatsApp, enabling doctors to offer greater convenience, personalization, and efficiency in their communication with their patients while saving care providers’ valuable time. Headquartered in Mexico City, we are a global team with team members based in Mexico, New York and San Francisco. 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 & Accel, and an incredible list of angel investors including the founders of Nubank, Rappi, Maven Clinic, Xepelin, Forward Health 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
This job posting was last updated on 7/30/2025