Mobile Development Engineer

Harmonic is a startup building the world’s most advanced mathematical reasoning engine, recently achieving Gold Medal-level performance on the 2025 International Math Olympiad (IMO). Backed by some of the world's most prominent investors, we are intentionally scaling our elite, lean technical team.

We are seeking a Mobile Development Engineer to drive the early development of Harmonic’s mobile products. In this role, you will be instrumental in translating cutting-edge mathematical superintelligence into delightful and useful consumer experiences. We are looking for a driven self-starter with a proven track record of shipping ambitious, impactful, and user-centric products from inception, specifically demonstrating expertise in crafting performant, scalable, and intuitive mobile applications.

Key Responsibilities

• Own the end-to-end development of our mobile applications, leading the technical design, implementation, and deployment of a high-quality product from the ground up.

• Obsess over the details of the user experience by implementing intuitive mobile user experiences as well as optimizing application performance.

• Partner closely with product managers, designers, and research teams to define, prototype, and build innovative features that transform complex technology into seamless and intuitive user interactions.

• Leverage AI-native tools (e.g., Cursor, GitHub Copilot) to accelerate development cycles and establish new best practices in mobile engineering.

What We're Looking For

Deep Mobile Expertise: A proven track record of shipping ambitious and user-centric mobile applications from concept to launch. Professional experience with React Native and/or Expo is preferred.

Product-Minded Engineer: A strong sense of user empathy and product intuition, with a passion for building experiences that are both powerful and delightful.

Ownership and Ambiguity: The ability to operate independently and effectively in a fast-paced, collaborative, and highly ambiguous environment, consistently delivering results.

Cross-Functional Excellence: Superb communication skills and a history of working effectively with product, design, and other engineering teams to achieve shared goals.

Minimum Qualifications

• BS in Computer Science, Engineering, a related field, or equivalent industry experience.

• 3+ years of hands-on relevant industry experience.

• Demonstrated success in delivering complex native mobile apps.

• Experience with experimentation and iterative development processes.

• Proven work ethic, self-motivation, and a passion for building impactful products

• Experience collaborating with designers, including familiarity with Figma.

• Solid product sense, an eye for design, and a willingness to think critically about user experience.

• Experience with modern software development practices including coding standards, code reviews, source control management, build and deployment processes, and testing.

• Proven track record operating successfully in a fast-paced, collaborative environment.

Preferred Qualifications

• Experience with Expo and React Native

• Prior experience in collaborating with research teams or in a research-driven environment.

• Experience in developing products from concept to launch.

• Experience developing complex web apps.

What We Offer

• Unlimited PTO

• 401(k) matching

• 100% employer-paid health, vision, and dental benefits for employees and 50% coverage for dependents. Harmonic offers varied health coverage options to select what is best for you and your family.

• Health Savings Account (HSA) available for qualifying health plans

Learn more about what we are working on!

Is Math the Path to Chatbots That Don't Make Stuff Up?

Training Data Podcast: Why Vlad Tenev and Tudor Achim of Harmonic Think AI Is About to Change Math—and Why It Matters

We are an equal opportunity employer and do not discriminate on the basis of race, religion, national origin, gender, sexual orientation, age, veteran status, disability or any other legally protected status.