Senior Front End Engineer

Senior Front End Engineer (Design-Focused)About the RoleWe're looking for a senior frontend developer who lives at the intersection of engineering excellence and exceptional design. You'll be building mobile experiences that users genuinely love to interact with—apps that feel alive, responsive, and meticulously crafted down to the last pixel and animation curve.This isn't a role for someone who just makes things work. We need someone who makes things feel right.What You'll DoOwn and ship major features end-to-end with minimal oversightBuild fluid, performant animations that elevate the user experienceCollaborate closely with design to translate vision into polished, production-ready codeThink holistically about how your work fits into the broader system—anticipating edge cases, dependencies, and unintended side effects before they become problemsEstablish and evolve testing practices that give the team confidence to ship quicklyMaintain and improve a mature, complex codebase that's been in active development for yearsWhat We're Looking ForExperience5+ years of professional frontend development experience (candidates with 10+ years are strongly preferred)2+ years at a creative design agency building sophisticated, client-facing mobile applicationsDeep experience with large, mature codebases that have been under active development for 2+ yearsTechnical SkillsExpert-level proficiency with React Native and ExpoStrong TypeScript skills across React Native and ReactJS projectsStrong command of React Native Reanimated for complex gesture-driven and physics-based animationsSolid ReactJS experience with animation libraries like Motion and GSAPComfortable working in both Expo-managed workflows and bare React Native when neededExperience writing automated tests and building out test coverage incrementallyDesign SensibilityAn eye for design and strong opinions about interaction patterns, timing, and polishAbility to identify when something looks "off" and the skills to fix itExperience collaborating with designers and translating high-fidelity mockups into pixel-perfect implementationsWork StyleSelf-directed and comfortable operating with limited oversightShips complete, well-tested features—not prototypes that need cleanupSystems thinker who considers how a feature interacts with the rest of the codebaseBalances big-picture architecture decisions with meticulous attention to detailTests their own work extensively before considering it "done"Nice to HaveFamiliarity with backend concepts (APIs, databases, authentication flows)Contributions to open-source projects or a portfolio of published appsWhat Success Looks LikeIn this role, you'll know you're succeeding when:Features you ship require minimal bug fixes after releaseOther engineers trust the patterns and code you introduceUsers notice the quality—even if they can't articulate why the app feels so goodYou're anticipating problems before they happen, not just reacting to themAbout UsMatter is redefining healthy eating and nutrition. We combine a science-backed AI-powered platform with a chef-driven restaurant to create meals tailored to your health, flavor and performance needs. We’re building the future of personalized nutrition at scale, and we're on a mission to empower people to use food to help achieve their metabolic health goals.We are 100% Gluten and Seed-Oil free. We never use ultra-processed ingredients and actively minimize our exposure to microplastics. We serve sustainably raised proteins, such as 100% Grass-Fed Grass-Finished Beef, Wild-Caught Seafood and Antibiotic-Free Chicken. We prioritize healthy fats such as Single-Origin EVOO. Our menu also features organic produce and a wide variety of supplemental add-ins like protein, creatine, collagen and adaptogens.