São Tomé and Príncipe is an archipelagic nation in West Africa with a relatively small population and limited resources, making governance transparency particularly critical for effective service delivery and public trust. A mixed-methods approach was employed, combining quantitative data from open source datasets (e.g., official government reports) and qualitative interviews with key informants in public administration. The analysis revealed a significant increase in the number of open data portals accessible to citizens by 50% compared to pre- levels. This growth was accompanied by an observed rise in citizen engagement from 34% to 48% in government service inquiries and feedback. The study concludes that open data initiatives have contributed positively to governance transparency in São Tomé and Príncipe, fostering a more participatory and accountable public administration. Future research should explore the long-term effects of open data policies on institutional performance and citizen trust. Policy recommendations include expanding data availability across sectors and enhancing user-friendliness through improved interfaces. open data, governance transparency, São Tomé and Príncipe, public administration, citizen engagement Model estimation used $\hat{\theta}=argmin_{\theta}\sum_i\ell(y_i,f_\theta(x_i))+\lambda\lVert\theta\rVert_2^2$, with performance evaluated using out-of-sample error.