Software Engineer, Product

About HarmonicAt Harmonic, we are building a mathematical reasoning engine that operates with absolute precision. While most AI makes maximum-likelihood guesses, Harmonic's Aristotle uses Lean 4 and reinforcement learning to verify its reasoning and results. Following our Gold Medal-level performance on the 2025 International Math Olympiad (IMO) and the successful resolution of long-standing open problems, we are proving that AI can master the most rigorous domains of human thought. Backed by some of the world's most prominent investors, we are intentionally scaling an elite technical team.About the RoleWe are seeking a talented Software Engineer to drive both the product architecture and core product infrastructure of Harmonic's flagship product. In this role, you will be building robust backend services and delivering polished, performant user interfaces. We are looking for a driven self-starter who wants to own systems from inception, with a proven track record of architecting applications from the ground up, building scalable services, and delivering high-performance, reliable systems.Key ResponsibilitiesOwn the end-to-end product development, collaborating with our Head of Product and designer while maintaining high-performance backend infrastructureArchitect and optimize full-stack components to efficiently process and render complex, interactive data streamsDesign, implement, and maintain scalable APIs and data flow architecturesPartner closely with design, research, and leadership to translate complex technical capabilities into functional, intuitive, and feature-rich user interactionsManage and scale backend systems and cloud infrastructure to ensure reliability and observabilityArchitect and maintain the technical infrastructure supporting our core platform integrations and public-facing web systemsMinimum QualificationsBS in Computer Science, Engineering, a related field, or equivalent industry experience5+ years of hands-on relevant industry experience building production applications at scaleProficiency with TypeScript, React, or similar modern web technologies, alongside strong proficiency in Python for backend logic and data pipelinesDeep experience designing distributed systems, RESTful/GraphQL APIs, and integrating frontend components with backend servicesExperience collaborating with design, product, research, and infrastructure teams to ship user-facing products from concept to launchProven experience authoring clean, performant code for scalable backend architecturesExperience with modern software development practices including coding standards, code reviews, source control management, build and deployment processes, and testingExperience with experimentation and iterative development processProven work ethic, self-motivation, and a passion for building impactful productsProven track record operating successfully in a fast-paced, collaborative environmentPreferred QualificationsPrior experience building high-throughput messaging pipelines or real-time data systemsExperience with building complex web user applicationsDemonstrated product sense in partnerships with design, product, research, and infrastructure engineersExperience as a founder or early engineer building a product from scratch from ideation to launchWhat We OfferUnlimited PTO401(k) matching100% 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 plansEqual Opportunity StatementHarmonic is committed to diversity and inclusivity in the workplace. 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.