Fullstack Engineer - Mid Level - Actions Team

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.
We're looking for a Fullstack Engineer to join our Actions team in building the core infrastructure that powers our plugin platform. You'll create the UI components, integration layers, and security mechanisms that enable our customers to extend the platform with custom integrations while maintaining safety and flexibility across our 1,500+ customer base. This is essential infrastructure work that shapes how our customers scale their integrations.
Our environment
Working with skilled and like-minded professionals in a team that values diversity and inclusivity
We aim to create a flexible and agile work environment that promotes the well-being and work-life balance of our employees
We believe that team events during working hours play a vital role in building an exceptionally effective team, and we encourage them
We are enthusiastic about technology and committed to using it to improve the world
We follow the “You build it, you run it” approach and take pride in it
The Team
The Actions team sits at the heart of Staffbase's AI ambitions. We're the team that gives Navigator — our AI assistant and the main entry point into Staffbase — the ability to actually do things: submit a form, complete a task inside an integration, or take an action on a user's behalf through the agent. If Navigator is the brain, we build the hands.
That means two big things. First, we enrich what the AI can see and act on, our plugins, our widgets and the wider Staffbase platform so the assistant can do real work, not just talk about it. Second, we build the extensions that connect to the tools people already use, like Workday, Personio, ServiceNow and Microsoft.
We're not just shipping features, though. A core part of our mission is building the extensibility framework that lets others build too.
What you'll be doing
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
What you need to be successful
Strong knowledge of React and TypeScript for frontend work
Java/Kotlin or Go an 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 experience
You are comfortable with edge and serverless runtimes like Cloudflare Workers
You have built a plugin system, SDK, or developer platform before
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
What you'll get
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 offering a company pension scheme
Volunteers Day - you’ll get one day off per year for supporting a social project