Mirrai Careers

Senior Staff Software Engineer, Core Experiences

Box

Warsaw, Poland Posted 30+ days ago
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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 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. Why Box needs You We're looking for a Senior Staff Software Engineer to join our Core Experience organization, supporting both backend and frontend engineering across our Warsaw and Redwood City sites. This is a high-impact, hands-on senior individual contributor role for someone who wants to design complex systems and see them through to production in a customer-facing domain. You will help shape the technical direction of a large-scale, customer-facing platform - breaking out of our monolith, modernizing our backend and frontend architectures, and leading the organization toward strong continuous integration and DevOps practices. You will also champion AI adoption across the organization - enabling teams to use AI in their day-to-day engineering operations and building agents that accelerate the software development lifecycle (SDLC). You will ensure that systems are not only well-designed, but built, shipped, and operating reliably at scale. What You’ll do * Build Critical Systems * Own the architecture of key backend and frontend systems within Core Experiences. * Lead the implementation of high-impact components end-to-end. * Ensure systems are scalable, reliable, and observable from day one. * Drive Execution at Scale * Partner with engineering teams across Warsaw and Redwood City to turn architecture into working systems. * Lead delivery of large, cross-team initiatives with measurable business impact. * Balance speed, quality, and long-term maintainability in real-world tradeoffs. * Set Technical Direction * Establish patterns, frameworks, and standards that enable teams to move faster. * Translate business priorities into clear technical roadmaps. * Identify risks early and guide teams toward pragmatic solutions. * Enable AI in Engineering * Enable teams across Core Experiences to apply AI in their day-to-day engineering operations — coding, code review, testing, debugging, documentation, and incident response. * Design and build agents that support the full software development lifecycle (SDLC), from design and implementation through code review, testing, deployment, and operations. * Establish best practices, guardrails, and reusable patterns for safe and effective AI usage in engineering workflows. * Evaluate and integrate AI tooling (e.g., Cursor, Claude Code, internal Box AI capabilities) into the team's standard development workflow. * Measure and continuously improve developer productivity and code quality through AI-driven workflows. * Influence & Mentor * Collaborate across geographies and functions to align on architecture and execution. * Mentor senior and staff engineers in system design, implementation, and effective use of AI in engineering. * Contribute to a culture of strong ownership, quality, and continuous improvement. * Ship Code * Be hands-on in prototyping and contributing production-grade code across the stack. What You'll tackle in the first 6-12 months * Lead the effort to break our backend and frontend out of the monolith into modern, modular, and maintainable architectures. * Drive the organization's adoption of continuous integration and DevOps best practices, raising the bar for build, test, and deployment workflows. * Roll out AI-assisted engineering practices across Core Experiences — enabling teams to use AI in their day-to-day work and embedding it into coding, review, and operational workflows. * Design and ship agents that support the SDLC (e.g., code generation, automated review, test authoring, release readiness, on-call assistance) and demonstrate measurable productivity gains. * Define how we build products going forward — including tooling, workflows, and architectural patterns shared across Warsaw and Redwood City. * Set up frameworks for effective cross-site, cross-functional collaboration between backend and frontend engineers. * Balance rapid delivery with long-term technical investments to ensure Core Experiences scales with enterprise-grade performance, security, and maintainability. Who You Are * 12+ years of professional software engineering experience across backend and frontend. * 5+ years leading complex, cross-team technical initiatives. * Ability to operate at both high-level architecture and low-level execution. * Proven track record of designing and shipping distributed systems at scale. * Hands-on experience breaking monoliths into service-oriented or modular architectures. * Strong experience driving continuous integration, CD, and DevOps practices across engineering organizations. * Hands-on experience using AI coding tools (e.g., Cursor, Claude Code) and integrating them into team workflows; experience designing or building LLM-powered agents for engineering use cases is a strong plus. * Familiarity with modern AI/agent frameworks, prompt engineering, evaluation, and safe deployment of AI in production engineering workflows. * Experience aligning cross-functional and cross-site stakeholders around architecture decisions. * Pragmatic decision-making: you balance ideal design with real-world constraints. * Passionate about mentoring and building a strong engineering culture. * BS/MS/PhD in Computer Science, Engineering, or equivalent experience. * Comfortable working in a hybrid, globally distributed environment; able to travel to the U.S. at least twice a year for team off-sites. Other information * Level positioning: Individual contributor, Director-equivalent * Reporting line: Engineering Director, Core Experiences (Warsaw) * Role location: Warsaw-based, partnering closely with Redwood City * Core Experience Eng team locations: Poland and US (Warsaw and Redwood City) * In-office requirements: 3 days per week, Tuesdays–Thursdays Methodology * Frontend: React, TypeScript, modern JavaScript frameworks * Backend: Java, Spring Boot, Node.js * Version Control: Git, GitHub Enterprise * Project Management: Agile/Scrum, Jira * Knowledge Base: Confluence * CI/CD & DevOps: Kubernetes, Jenkins, Terraform * AI tools: Cursor, Claude Code, Box AI; agent frameworks for SDLC automation 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-EMEA #LI-PK1 #LI-HYBRID

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