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Software Engineer III, Frontend Runtime

Boxinc

Warsaw, Poland (Warsaw Office) permanent

Posted: March 4, 2026

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Quick Summary

Software Engineer III, Frontend Runtime is responsible for designing, developing, and testing client-side JavaScript code for Box's user interface. The ideal candidate will have hands-on experience with React, Node.js, and TypeScript, and be proficient in optimizing performance and scalability. Strong problem-solving skills, attention to detail, and experience with collaboration tools are essential.

Job Description

What is Box?

Box is the world’s leading Content Cloud. We are trusted by more than 115K organizations around the world today, including nearly 70% of the Fortune 500 and leaders across deeply regulated industries (such as JLL, and Nationwide), to protect their data, fuel collaboration, and power critical workflows with secure, enterprise AI.

By joining Box, you will have the unique opportunity to continue driving our platform forward. Content powers how we work. It’s the billions of files and information flowing across teams, departments, and key business processes every single day: contracts, invoices, employee records, financials, product specs, marketing assets, and more. Our mission is to bring intelligence to the world of content management and empower our customers to completely transform workflows across their organizations. With the combination of AI and enterprise content, the opportunity has never been greater to transform how the world works together and at Box you will be on the front lines of this massive shift.

Founded in 2005, Box is headquartered in Redwood City, CA, and we have offices across the United States, Europe, and Asia.

We are an AI-first company. This means you approach your work with a growth mindset and find ways to leverage AI to help make faster, smarter decisions that will 10X your impact at Box.

What you'll do:

• Compose written specifications and documentation for software projects.

• Maintain documentation on development setup and engineering environment along with the greater team.

• Attend and engage in weekly stand-ups, team meetings, manager 1:1s.

• Work collaboratively with other engineers, team members and across teams.

• Play a role in developing and fostering Box culture in the newly created office.

• Represent Box Poland internally and externally

• Participate in the production on-call duties rotation with the team members

Who you are:

• Ideally 3+ years of professional software development experience.

• BS, MS, or PhD in Computer Science or Engineering, or equivalent work experience

• Proficiency in React framework - you have extensive experience building complex, scalable applications and understand modern React patterns.

• Proficiency in TypeScript skills - you write type-safe code and leverage TypeScript's.

• You possess strong knowledge of algorithms, data structures, software design principles

• Experience with testing principles and frameworks (Jest, React Testing Library, Playwright, etc.).

• Assess, communicate and complete project milestones with manager and team members in a time sensitive manner

• Adapt to the technical and stylistic needs of integrations and projects as they occur; including technical tools, programming languages, technical limitations, and product requirements

• Must speak English proficiently

Preferred skills:

• Experience with public cloud systems such as GCP, AWS or Azure

• Experience in a fast-paced, highly collaborative environment

• Experience contributing to open source project

At Box, we believe that providing the best tools leads to the best outcomes. That's why we equip our engineers with AI-powered development tools like Cursor IDE and GitHub Copilot to help you write better code faster

Percentage of Time Spent:

• 60% new feature coding

• 15% bug fixes

• 15% meetings

• 10% documentation

Methodology

• Agile management - Scrum

• Issue tracking tool - Jira

• Knowledge repository - Confluence

• Code reviews - GitHub Enterprise

• Version control system - GIT

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, with a focus on Tuesdays, Wednesdays, and Thursdays. Your Recruiter will share more about how we work and company culture during the hiring process.

EQUAL OPPORTUNITY
We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability, and any other protected ground of discrimination under applicable human rights legislation". For details on how we protect your information when you apply, please see our Personnel Privacy Notice. For more details on how Box Poland protects your information, please see our Supplemental Personnel and Candidate Privacy Notice.

#LI-VM1 #LI-EMEA

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