Urbanization in Tanzania is advancing faster than formal planning systems can accommodate, resulting in the expansion of informal settlements and the dominance of the informal sector as a primary economic engine. In cities such as Dar es Salaam, informality is not peripheral it is structurally embedded in how the city functions. What is changing, however, is the way these systems are understood and managed, largely due to the increasing role of digital technologies and data systems. A central constraint in managing informal settlements has historically been the absence of reliable spatial data. Informal areas often exist outside cadastral records and formal planning maps, limiting the ability of institutions to design effective interventions. Recent studies show that geospatial technologies particularly GIS, satellite imagery, and AI-driven mapping are transforming this landscape by enabling high-resolution identification of settlement patterns, infrastructure deficits, and land-use dynamics (Bettencourt & Marchio, 2023; Kakooei et al., 2024). These tools allow planners to move from generalized assumptions to precise, localized analysis at the street and block level. This shift toward spatial visibility is critical because it enables structured intervention without displacement. Rather than relying on demolition or relocation, planners can adopt incremental upgrading approaches. These include introducing roads, drainage systems, and utilities into existing settlement layouts while preserving social and economic networks. Evidence shows that GIS-supported planning improves both feasibility and community acceptance of such interventions by aligning infrastructure design with actual settlement morphology (Abbott, 2003; Kuffer et al., 2016). At the same time, participatory mapping has emerged as a key mechanism for improving both data quality and governance outcomes. Studies indicate that involving residents directly in mapping processes enhances accuracy while also strengthening community ownership and negotiation capacity with local authorities (Ouma et al., 2024). This represents a shift from top-down planning toward collaborative urban management, where informal communities are treated as active agents rather than passive beneficiaries. Parallel to spatial transformation, the informal economic sector is undergoing a rapid digital shift. Mobile money systems, in particular, have fundamentally altered how transactions occur within informal economies. In Tanzania, the expansion of mobile financial services has increased financial inclusion, enabling individuals and businesses without formal banking access to participate in digital transactions (FSDT, 2024). More broadly, studies show that mobile and electronic payment systems improve transparency, reduce transaction costs, and expand the economic visibility of informal actors (World Bank, 2024). The implications of this are structural. Digital transactions create data trails, which can support access to credit, taxation systems, and integration into formal economic frameworks. At the same time, mobile platforms are enabling informal businesses to access market information, communicate with customers, and manage operations more efficiently. This transition is not uniform, however. Recent research highlights that digital platform adoption in informal settlements is shaped by “platform frugality,” meaning that only low-cost, highly accessible technologies such as basic fintech and social media achieve widespread use, while more complex systems remain limited (van Tuijl et al., 2026). Beyond finance, digital technologies are also improving service delivery in informal settlements. Mobile-enabled systems are being used to manage water access, waste collection, and energy distribution, often through decentralized and community-based models. Studies indicate that such innovations can significantly improve service efficiency in low-income urban areas, particularly where conventional infrastructure systems are absent or underdeveloped (Kibala Bauer, 2020). The integration of these technological systems creates new opportunities for holistic urban planning. When spatial data from GIS systems is combined with economic data from mobile platforms, cities gain a more comprehensive understanding of how informal systems function. This enables targeted infrastructure investments, more effective policy design, and improved resource allocation. In this evolving context, firms such as ARM City Consultants are positioned to play a critical role. By integrating geospatial intelligence, urban planning, and digital systems, they contribute to frameworks that bridge formal and informal systems. Their work reflects a broader paradigm shift from viewing informality as a problem to recognizing it as a complex system that can be optimized through data and technology. Despite these advances, challenges remain. Studies consistently highlight issues such as unequal access to digital tools, limited digital literacy, and regulatory gaps as barriers to effective implementation (Manu et al., 2026). There is also the risk that digitization could accelerate land speculation or exclusion if not accompanied by appropriate governance frameworks. Nevertheless, the trajectory is clear. Informal settlements and the informal sector are increasingly becoming integrated into digital urban systems. Technology is enabling a transition from invisibility to visibility, from fragmentation to coordination, and from exclusion to inclusion. From a systems perspective, informality can be understood as a decentralized and adaptive form of urbanism. Technology does not replace this structure; it enhances it by introducing data, connectivity, and scalability. The result is a hybrid urban model where formal and informal systems coexist within an increasingly integrated digital framework. In conclusion, the intersection of informal settlements, the informal sector, and technology represents one of the most significant transformations in Tanzania’s urban development trajectory. Recent studies show that geospatial tools, mobile financial systems, and participatory platforms are enabling more inclusive, efficient, and data-driven urban systems. The central challenge now lies in governance ensuring that these technologies are deployed in ways that protect communities, enhance livelihoods, and support equitable urban growth. References 1. Abbott, J. (2003). The use of GIS in informal settlement upgrading. 2. Bettencourt, L. M. A., & Marchio, N. (2023). Street access, informality and development in Sub-Saharan Africa. 3. Kakooei, M., et al. (2024). Mapping Africa settlements using satellite imagery and deep learning. 4. Kuffer, M., Pfeffer, K., & Sliuzas, R. (2016). Slums from space remote sensing perspectives. 5. Ouma, S., et al. (2024). Informal settlements domain report. 6. van Tuijl, E., et al. (2026). Platform use in informal settlements and frugal innovation. 7. FSDT (2024). Mobile money adoption in Tanzania. 8. World Bank (2024). Digital payments and informal sector integration. 9. Kibala Bauer, G. (2020). Digital solutions for urban service delivery. 10. Manu, E. K. (2026). Digital transformation and informal innovation in Africa.