Fullstack Engineer - Mid Level

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Fullstack Engineer - Mid Level in Others

Staffbase
Full time
Email

Others
09/21/2026
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Berlin, Germany

Responsibilities

Build a reusable UI component library for generated applications, including views and approval flows.
Create connection layers between generated applications and customer source systems such as HR, time-tracking, and scheduling platforms.
Define extension points for widgets, menus, and sidebars through clean plugin configuration.
Design and implement cross-integration authentication so employees can use multiple integrations without repeated logins.
Ship and use plugins on the platform to identify gaps and improve the extensibility framework.
Apply multi-tenant security practices, including scope checks and prevention of cross-tenant data leaks.

Requirements

Strong knowledge of React and TypeScript for frontend development.
Experience with Java, Kotlin, Go, or TypeScript for backend services.
Hands-on experience integrating challenging third-party APIs, including systems with inconsistent authentication, limited documentation, legacy technology, or on-premises deployments.
Deep understanding of multi-tenancy security and data isolation.
Good judgment in deciding what to standardize and what to keep flexible.
Preferred experience with Cloudflare Workers, plugin systems, SDKs, developer platforms, design systems, component libraries, OAuth, enterprise SSO, or AI code generation as a product surface.

Benefits

Competitive salary packages including a unit-based Long Term Incentive Plan.
Flexible working time models and hybrid work options.
Yearly flexible work allowance of €1560.
31 vacation days annually, including one floating holiday.
Pro rata fully paid Fridays off during August.
Company pension scheme.
One paid Volunteers Day per year for supporting a social project.

Salary: Competitive

Staffbase

Staffbase builds an employee communications and experience platform for enterprises to reach frontline and desk-based workers. Its SaaS suite includes a branded employee app, intranet, email and SMS tools, digital signage, and Microsoft 365/Teams integrations managed from a single console. Founde...

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