Senior Frontend Engineer, Core Experiences

Box • Redwood City, CA

11h • Hybrid

About The Position

Every file previewed, every document shared, every task completed — our engineering team builds the core experiences that make it all happen. We're evolving our React architecture into a faster, more reliable, and delightful experience — built for an AI-driven world — while shipping new features customers are actively asking for. If you're excited by building at scale, partnering closely with Product and Design, and leading complex architectural evolution with zero downtime, this role is for you.
As a Senior Software Engineer focused on frontend, you'll drive end-to-end delivery of high-impact features, contribute to our next-generation architecture and design blueprints, and amplify our velocity and output. You'll work on a team that actively embraces AI-assisted tooling and workflows while staying grounded in strong engineering fundamentals — writing clean code, making thoughtful design decisions, and building systems that last. You'll also take part in releases and on-call rotations to keep our core workflows available and performant.

Requirements

• 5+ years of professional experience building production web applications.
• Strong product mindset with experience partnering with PM and Design to ship customer-impacting features.
• Experience owning complex projects end-to-end, including testing, observability, and phased rollouts.
• Proven track record evolving frontend architectures and adopting modern design systems at scale.
• Curiosity about AI-assisted development workflows and a pragmatic approach to integrating them into everyday engineering.
• Comfortable working with distributed teams across time zones.
• Familiarity with CI/CD, release processes, and on-call support for web applications.
• Strong understanding of web fundamentals, including performance, accessibility (WCAG), security, and testing.
• Bachelors or above degree in Computer Science or equivalent practical experience.
• Proficiency in React and JavaScript/TypeScript.
• Clear, inclusive communicator who values collaboration, mentorship, and continuous improvement.

Nice To Haves

• Exposure to backend services and API design.

Responsibilities

• Lead development of React-based features for core web experiences, with a focus on evolving the preview experience and other high-impact user flows.
• Drive the evolution of our frontend architecture toward modern, scalable design systems with a focus on performance and accessibility.
• Collaborate with Product Managers and Designers to translate customer requests into clear requirements and iterative roadmaps.
• Own complex projects from design to launch, including testing, instrumentation, and rollouts.
• Contribute to frontend architecture, coding standards, and reusable UI components.
• Partner with backend engineers to define APIs and ensure seamless end-to-end functionality.
• Collaborate across time zones with a partner engineering team in Poland to coordinate on shared features and architectural decisions.
• Leverage AI-assisted tooling to accelerate development, improve code quality, and push our architecture forward — while applying the engineering judgment to know when it helps and when it doesn't.
• Participate in our on-call rotation, available at all times while on-call to help respond to and triage any issues that arise.

Benefits

• Box lives its values, with community and in-person collaboration being a core part of our culture. Boxers are expected to work from their assigned office a minimum of 3 days per week.
• Box is committed to fair and equitable compensation practices. Actual base salary (or OTE if commissionable role) is dependent upon factors such as: knowledge, skill level, experience, and work location. This role is also eligible for equity and benefits. For more information on benefits, check out our healthcare benefits and additional Box Benefits + Perks.
• In accordance with OFCCP compliance, here is the Pay Transparency Provision.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 501-1,000 employees