What are the responsibilities and job description for the Founding Mobile Engineer @ Harmoni position at Lume?
Company Description
Lume is a forward-thinking platforms company dedicated to designing scalable and secure technologies that foster connections and enable innovation. By developing infrastructure, systems, and digital experiences, Lume creates integrated platforms that empower individuals, businesses, and communities to thrive in the digital age. With a commitment to empowerment, innovation, integrity, and impactful solutions, Lume develops digital ecosystems that drive meaningful growth and lasting impact. At its core, Lume focuses on building the underlying technologies that support interconnected digital worlds and sustainable advancements.
About the Role
We’re looking for a Founding Mobile Engineer with a strong focus on Android to help build and shape the mobile experience for Harmoni, Lume’s community-first social platform.
This is an early-stage role where you’ll be working directly on core product features — messaging, calling, and real-time interactions — while helping define how the mobile app evolves as we grow.
You’ll collaborate closely with the founder and contribute to a shared React Native codebase, while also owning Android-specific behavior, performance, and overall experience. This isn’t about maintaining an app — it’s about helping build it.
What You’ll Work On
• Build and refine core mobile features across messaging, calling, and social interaction
• Shape the Android experience end-to-end, from UI to native behavior
• Contribute to a shared React Native
• Implement and improve real-time systems (chat, voice/video calling, notifications)
• Work on performance, responsiveness, and reliability across devices
• Collaborate on product decisions, UX improvements, and mobile architecture
What We’re Looking For
• Strong experience with Android development (Kotlin/Java)
• Experience working with React Native and TypeScript
• Familiarity with iOS development
• Understanding of real-time systems (WebSockets, RTC, messaging flows) is a plus
• Ability to work in an early-stage environment and take ownership of what you build
• Product-minded — you care about how things feel, not just that they work
• Based in the United States, preferably Florida
Why This Role
You’ll be joining at a stage where your work directly shapes the product and the direction of mobile at Lume. This is a hands-on role with real ownership — not a narrow scope or a pre-defined box.
If you enjoy building from the ground up and want to have a direct impact on a product people will use daily, this is that kind of role.