Senior Frontend Engineer (React, Javascript, Node)

About The OpportunityWe are looking for a highly skilled and proactive Software Engineer III to join our client's team in a contract-to-hire capacity. This role is built for a top-tier Front End Engineer who meets a very high technical bar and thrives in a fast-paced corporate environment.You will be responsible for building robust, scalable, and cutting-edge user interfaces. Beyond writing excellent code, we are looking for a thought leader and an AI-forward thinker who takes immense pride in their ownership of projects. If you are passionate about the "latest and greatest" in the frontend space, stay constantly updated on technology trends, and know how to drive technical excellence, this is the role for you. Important Note: This role requires 3x/week on-site (Tuesdays, Wednesdays, and Thursdays) at the headquarters in San Mateo, CA.ResponsibilitiesDesign, build, test, and ship high-quality user experiences and support integrations for FanApp surfaces across search, recommendations, merchandising, promotions, and product discovery.Build robust integrations with backend APIs and services, with careful attention to performance, reliability, and maintainability.Implement instrumentation and eventing that help the team understand fan behavior, feature adoption, experimentation outcomes, and funnel performance.Partner with product managers, designers, and engineers across teams to translate business goals into scalable technical solutions and deliver them with high quality.Identify and resolve performance bottlenecks, improve app responsiveness, and help create exceptional fan experiences.Write clean, well-tested, maintainable code and contribute to code reviews, documentation, automation, and engineering best practices.Take ownership of well-scoped projects, drive execution from design through launch, and help improve team efficiency and delivery quality.Support production excellence by debugging issues, improving observability, and contributing to a strong quality and release culture.Required QualificationsBachelor’s degree in Computer Science or a related field, or equivalent practical experience.5+ years of professional software engineering experience building consumer-facing applications or platforms.Strong experience with modern frontend or app development technologies and patterns, including component-based UI development and API-driven applications.Solid foundation in JavaScript or TypeScript and experience building maintainable, scalable user-facing systems.Experience integrating with backend services using RESTful APIs and building resilient client-side data flows.Experience writing unit and integration tests and contributing to a culture of code quality and continuous improvement.Strong problem-solving, debugging, collaboration, and communication skills.Nice To Have SkillsExperience building native apps, mobile web, or high-scale ecommerce experiences.Experience with search, recommendations, personalization, experimentation, or merchandising systems.Familiarity with analytics and event instrumentation for consumer products.Experience improving performance, observability, and release quality for customer-facing applications.Experience working in cross-functional products and engineering teams in a fast-paced environment.Prior experience serving as a tech lead on product or platform initiatives is a plus.Strong problem-solving, debugging, collaboration, and communication skills.Avenue Code discloses salary range information based on our commitment to fairness and transparency. We consider a wide range of factors such as internal equity, geographic location, relevant education, qualifications, certifications, experience, skills, seniority, business or organizational needs, and others. At Avenue Code, it is not typical for an individual to be hired at or near the top of the range for their role, and compensation decisions are dependent on the facts and circumstances of each case. A reasonable estimate of the current range for a Senior Frontend Engineer is from $145k to $150k yearly.Avenue Code reinforces its commitment to privacy and to all the principles guaranteed by the most accurate global data protection laws, such as GDPR, LGPD, CCPA and CPRA. The Candidate data shared with Avenue Code will be kept confidential and will not be transmitted to disinterested third parties, nor will it be used for purposes other than the application for open positions. As a Consultancy company, Avenue Code may share your information with its clients and other Companies from the CompassUol Group to which Avenue Code’s consultants are allocated to perform its services.