Fullstack Engineer - Mid Level - Actions Team

About the Position

We are looking for a Fullstack Engineer - Mid Level to join our Actions Team at Staffbase. You'll be instrumental in building the core infrastructure that powers our plugin platform, creating UI components, integration layers, and security mechanisms. This role is essential for enabling our customers to extend the platform with custom integrations while maintaining safety and flexibility across our 1,500+ customer base.

About Staffbase

We inspire people to achieve great things together. Our mission is to help organizations unlock the power of inspirational communication with the first AI-native Employee Experience Platform. Our industry-leading and award-winning agentic AI communications channels - intranet, employee app, and email solutions - create engaging experiences that connect and empower employees.

Headquartered in Chemnitz, Germany, and New York City, with offices in Berlin, London, Sydney, Tokyo, Prague, and Minneapolis–St. Paul, our diverse team of 550+ employees supports 1,500+ customers-reaching over 14 million employees-in transforming their employee experience. We are proud to be a Unicorn company-privately valued at over $1 billion-demonstrating strong growth, innovation, and lasting impact in our industry. Together, we’re shaping the future of workplace communication.

Responsibilities

• Building a UI component library that generated apps can assemble from, turning components like payslip views and approval flows into maintained, reusable pieces instead of regenerated artifacts.
• Creating the connection layer between generated apps and customer source systems-HR platforms, time-tracking and scheduling systems, and a long tail of vendors with thin or undocumented APIs.
• Defining extension points (widgets, menus, sidebars) so plugins declare where they surface and what they connect to in a single, clean configuration.
• Designing and implementing a cross-integration authentication solution that lets customers run multiple integrations without forcing employees to log in repeatedly.
• Shipping plugins on the platform yourself, staying a consumer of what we build so we catch gaps early.

Requirements

• Strong knowledge of React and TypeScript for frontend work, Kotlin or Go and TypeScript experience for backend services.
• Real experience integrating third-party APIs, especially the challenging ones-inconsistent auth, partial documentation, legacy, and on-prem systems.
• Deep understanding of multi-tenancy security and data isolation; you care about scope checks and preventing cross-tenant leaks.
• Good judgment about what to standardize and what to leave flexible-drawing that line in the right place is central to this role.

Nice to Have

• Comfortable with edge and serverless runtimes like Cloudflare Workers.
• Experience building a plugin system, SDK, or developer platform.
• Developed a design system or component library that other teams depended on.
• Real-world experience with OAuth and enterprise SSO.
• Experience treating AI code generation as a product surface, not just a personal tool.

We Offer

• Competitive Compensation - we offer attractive salary packages including LTIP (unit-based Long Term Incentive Plan).
• Flexibility - we offer flexible working time models and the option of hybrid work, and support this with a yearly flex work allowance of €1560.
• Recharge - with 31 vacation days annually (incl. one floating holiday), plus pro rata fully paid Fridays off during August.
• Support - we offer a company pension scheme.
• Volunteers Day - you’ll get one day off per year for supporting a social project.

Locations

• Berlin, Germany
• Chemnitz, Sachsen, Germany
• Dresden, Sachsen, Germany

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