Senior Frontend Engineer

Senior Frontend EngineerSomerville, Massachusetts, United StatesAbout Mobi.AIMobi.AI is a leading AI platform and solution provider born from MIT's Computer Science and Artificial Intelligence Lab, specializing in building collaborative AI systems that solve complex business challenges in travel, transportation, and process automation. With a proven track record of transforming customer experiences and business operations for global brands, Mobi has brought cutting-edge AI technology from research to real-world applications.Working at MobiWe believe the best ideas emerge when diverse perspectives come together, so we're building a team that truly reflects that belief. If you're energized by complex challenges, inspired by working alongside thoughtful teammates, and passionate about building technology that enhances—rather than replaces—what makes us human, you'll feel right at home here.Our work is centered on five core values:Show up, be you. We welcome every kind of thinker, maker, and teammate: quiet or bold, methodical or messy, with all their talents and quirks. Inclusion isn't a checkbox—it's how we connect, grow together, and do our best work.Be scrappy, stay steady. We're resilient and quick on our feet, adapting with creativity and staying grounded when things shift.Create transparency, collaborate better. We believe knowledge grows when it's shared. Clear, open communication builds trust and strengthens collaboration.Foster community, be compassionate. We show up for our teammates, customers, and neighbors. Strong businesses grow from relationships built with care and grounded in shared effort.Build thoughtfully, create impact. We design for clarity, build for scale, and measure success through real-world impact.About the RoleAs a Senior Frontend Engineer at Mobi, you will join a highly creative, fast-paced and fearless team tasked with building the next generation of AI-driven solutions.We're seeking a passionate and innovative Frontend Engineer to help define the next generation of intelligent customer experiences at the intersection of travel and AI. In this role, you'll build elegant, highly interactive user interfaces that power AI-driven search and recommendation systems, virtual concierge services, and data-rich dashboards for analytics and visualization. You'll collaborate closely with clients and cross-functional teams to translate user needs into beautiful, intuitive digital experiences — from concept through delivery.You'll be working on cutting-edge products that integrate with state-of-the-art AI platforms, including interactive AI assistants and app integrations based on the Model Context Protocol (MCP). This includes helping define how users interact with models and immersive AI interfaces beyond plain text — building experiences that connect ChatGPT, Claude, and other AI platforms to brand ecosystems with rich, responsive visual UIs rather than just conventional text responses. MCP Apps, a new extension of the MCP standard, enables real-time interactive components within AI chat environments, and you'll help leverage this technology to create seamless, useful tools for our customers.We work with major global brands and industry leaders to shape the search and concierge experience for their users. Some client engagements involve deep collaboration to understand unique requirements and deliver tailored solutions, while others push the boundaries of what's possible with evolving AI ecosystems. If you thrive at the intersection of bleeding-edge technologies, customer engagement, and beautifully designed front-end systems, this is your opportunity to make a major impact.Key ResponsibilitiesDevelop, test, and maintain scalable front-end applications using modern frameworks and libraries (e.g., React).Translate UI/UX design wireframes and prototypes into high-quality, responsive, and accessible code.Collaborate with cross-functional teams to define, design, and ship new features.Optimize applications for maximum speed, scalability, and performance.Stay current with front-end trends, tools, and emerging AI technologies.Review code to troubleshoot, debug, and resolve issues.Own the full frontend lifecycle from development through testing and shipping, while implementing best practices for code quality, maintainability, and comprehensive testing (unit, integration, and end-to-end).QualificationsBachelor's degree in Computer Science, Engineering, or related field—or equivalent practical experience.Proficiency in HTML5, CSS3, JavaScript (ES6+).Experience with React framework.Experience with TypeScript.Familiarity with testing frameworks (e.g., Playwright, Jest, Cypress).Experience and comfort using AI Tools (CodeX, Claude Code, Copilot, etc.) to automate workflowsUnderstanding of backend APIs, and RESTful services.Understanding of responsive design principles and cross-browser compatibility.Experience with build tools and version control (e.g., Next, Vite, Git).Strong problem-solving skills and a collaborative mindset.Recent Experience working on AI Applications.Bonus: Understanding of MCP and response streaming.Pay Transparency:The base salary range for this US full-time position is between $140,000- $200,000 and is eligible for an annual company bonus, subject to standard withholding and applicable taxes. All candidates receive equity (ISO) and access to a comprehensive benefits offering. The base salary range reflects the minimum and maximum targets for candidates. The following factors are considered when determining the compensation offered: work location, skills, experience, and any relevant education or training. The Recruiter or Hiring Manager can share more about the specific salary range with you during the recruitment process and answer any questions you have.Benefits & PerksCompetitive Base Salary + Annual BonusComprehensive Health Insurance (Medical, Dental, and Vision) for you and your family, covered mostly by the company.Company-paid Disability and Life InsuranceOptional Pet Insurance and Identity Theft ProtectionPaid Parental Leave (for all types of parents and families)Equity ownership in the company401k PlanUnlimited Paid Time Off + $1,000 Bonus for taking five consecutive days offFlexibility to work anywhere in the world for one month a yearTuition ReimbursementCell Phone & Transportation ReimbursementLunch daily from local restaurantsCozy office environment with a full kitchen, massage chairs, live plants, and much more!Mobi hires those willing to work either full-time in office or on a hybrid schedule. Equal Opportunity We are an equal opportunity employer; applicants, employees, and former employees are protected from employment discrimination and harassment of any type based on race, color, religion, sex (including pregnancy, sexual orientation, or gender identity), national origin, age, disability, protected veteran status and genetic information (including family medical history), or any other characteristic protected by federal, state or local laws.