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Fullstack Software Engineer III

Boxinc

Warsaw, Poland (Warsaw Office) permanent

Posted: January 28, 2026

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Quick Summary

A Fullstack Software Engineer III is responsible for designing and developing scalable software applications, collaborating with cross-functional teams, and ensuring high-quality code quality.

Job Description

WHAT IS BOX?

Box (NYSE:BOX) is the leader in Intelligent Content Management. Our platform enables organizations to fuel collaboration, manage the entire content lifecycle, secure critical content, and transform business workflows with enterprise AI. We help companies thrive in the new AI-first era of business. Founded in 2005, Box simplifies work for leading global organizations, including JLL, Morgan Stanley, and Nationwide. Box is headquartered in Redwood City, CA, with offices across the United States, Europe, and Asia.

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.

We are currently looking for the engineers for the following teams:

• Relay team works together to delight our users by enabling them to automate routine tasks. Our products save users time and deliver results in consistent manner. As our team in Poland continues to grow and take on building new product, we are looking for a seasoned engineer who can own large components of the system and work independently. In this role, your work will impact millions of users, who use Relay to get their work done on a daily basis.

• AI Studio team works together to empower users to customize and extend their Box AI experience. Our products enable intelligent workflows and highly visible AI-driven features across the Box platform, helping users work smarter and faster. As this new initiative at Box continues to grow, we are looking for a seasoned engineer who can own significant parts of the system and contribute to building scalable, reliable solutions end to end. In this role, your work will directly impact some of the most demanded features of Box, used daily by millions of users. You will collaborate closely with engineers and architects to design, implement, and evolve high-availability services that meet the highest reliability standards.

WHAT YOU'LL DO

• Implement server-side logic and database interactions using Java and related frameworks.

• Create and maintain APIs to facilitate seamless communication between frontend and backend systems.

• Collaborate closely with designers to ensure a visually appealing and user-friendly experience in the application.

• Participate actively in code reviews to ensure high code quality, maintainability, and adherence to best practices.

• Troubleshoot, debug, and optimize application performance across the entire stack for a smooth user experience.

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

• Compose written specifications and documentation for software projects.

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

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

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

WHO YOU ARE

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.

• 3+ years of professional software development experience in Java and React.

• Strong knowledge of algorithms, data structures, software design principles, and object-oriented programming.

• Review and assess the technical feasibility of project requirements and propose innovative solutions.

• Share knowledge with the team on best practices and coding standards, fostering a collaborative and growth-oriented team environment.

• Actively engage in feedback processes, contribute to code reviews, and play a role in enhancing team processes and practices.

• Must speak English proficiently.

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. Your Recruiter will share more about how we work and company culture during the hiring process.

BENEFITS
Check out the overview of the benefits and additional perks offered at Box.

At Box, we believe unique and diverse experiences benefit our culture, our products, our customers, our company, and our world. We aim to recruit a passionate, high-performing workforce that reflects the world we live in. If you are head-over-heels about this role but unsure if you meet all the requirements, we encourage you to apply!

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-EMEA #LI-NP1 #LI-VM1

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