ABSTRACT: The growing ecological imprint of online infrastructures and the growing popularity of sustainable investment has made energy efficiency and carbon-aware computing a key strategic issue of technology startups. Although investors are becoming increasingly interested in sustainable projects, most technological startups have continued to face barriers between the desire to be sustainable and the ability to be attractive to investors in terms of energy efficiency of its architectural designs and carbon-friendly computing, resulting in a distance between the goals of sustainability and the funds agencies. The conceptual aim of the study is to explore the relationship between the attractiveness of tech startups when it comes to their energy efficiency and property sensitivity to carbon computing and Tech Startup Investment, how the consideration of environmental responsibility in software and system design can shift the perception and investment volume of investors. The study explores major issues associated with competitiveness based on sustainability, the signaling of green technology, and the investor confidence in a new digital venture. The study follows a qualitative conceptual approach whereby only the secondary data which is in the form of peer reviewed journals, academic books, policy paper, newspapers and literature liter true on sustainability will be used. The paper determines the presence of emerging trends through systematic literature review and thematic synthesis of the existing literature that show that startups that could incorporate energy-efficient architectures and carbon-aware computing practices could be associated with improved legitimacy, reduced risks, and long-term value propositions in the mind of investors. The results are also arguing that SOD has become a more popular non-financial performance metric that may affect investment decisions. The researchers suggest that technological startups should consider energy and carbon-consciousness in the fundamental architecture plans in order to enhance investment attitude. To sum up, the startup investment attractiveness of the future green digital economy significantly depends on sustainable practices in computing. KEYWORDS: Architectural energy efficiency, Carbon-aware computing, Tech startups, Investment attractiveness, Sustainable software architecture.