Workforce demand is uneven across organizations. Project-based companies may simultaneously face skill shortages in one unit while other firms hold underutilized employees with relevant expertise. Conventional hiring, contracting, and temporary agency models address parts of this problem, but they also create legal, ethical, organizational, and data-governance risks. This paper reframes a seminar project called Balanced Workforce into a governance-by-design framework for privacy-preserving inter-firm workforce leasing. The proposed Balanced Workforce Leasing Service (BWLS) enables companies to list temporary talent availability, discover anonymized skill profiles, negotiate assignments, and document agreements through locally deployed connectors and a minimal central coordination layer. The framework combines socio-technical governance, enterprise architecture, business model design, e3value-based value exchange modeling, and privacy-by-design principles. The paper presents the system concept, stakeholder model, process phases, architecture, business model, value network, and legal, ethical, and operational risk analysis. It argues that workforce leasing platforms should not be designed only as marketplaces. They require consent mechanisms, traceability, role-based access control, data minimization, contractual safeguards, dispute handling, and institutional accountability. The contribution is a structured framework and design artifact for future research on governed digital labor infrastructures. The paper does not claim deployment results or empirical validation; instead, it provides a design framework that can be evaluated through expert review, stakeholder workshops, prototype testing, and regulatory analysis.

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