Scope the scenario: you're tasked with managing a critical tech project that needs to deliver an optimized product with efficient code, stellar performance, and a high degree of flexibility. The decision you're facing now, one that could make or break the success of your endeavor, is choosing the appropriate language and the proficient developer for it. If you're inching towards C++, let us dissect the reasons why it might be an astute choice and why your project needs a C++ developer.

• Performance and Efficiency

C++, a statically-typed language, is known for its performance and efficiency. The static type system not only catches errors early in the development cycle but also performs optimally, given that the types are known at compile-time rather than run-time. This means less overhead in memory and faster execution speed.

When we delve into the realm of complexity theory, we find that C++ has the potential to cater to a wide variety of use cases, given its low-level capabilities. It allows developers to manipulate system hardware directly, making it a top choice for embedded systems and game development where performance is paramount. Therefore, having a C++ developer in your team can potentially improve your system's execution speed and efficiency, especially in resource-constrained environments.

• Control Over System Resources

C++ offers granular control over system resources. Unlike languages with automatic garbage collection, C++ developers have intricate control over memory management. This might seem laborious, but it's a trade-off for enhanced performance and efficiency.

Having such control empowers developers to craft solutions that are tailored to the system's constraints. In economic terms, this could be seen as practicing efficient allocation of scarce resources - a principle that lies at the heart of Economics. Thus, a C++ developer can leverage this control to engineer high-performance applications even in an environment with limited resources.

• Object-Oriented and Generic Programming

C++ is a multiparadigm language, supporting procedural, object-oriented, and generic programming. Object-oriented programming (OOP) encapsulates data and functions into objects, promoting code reuse and making code easier to maintain and understand. It's like Darwin's Theory of Evolution applied to code - through inheritance, code can evolve and adapt over time, while maintaining a clear lineage and structure.

On the other hand, Generic Programming in C++ allows developers to write a single, abstract code for a variety of data types. This greatly reduces the redundancy in code, much like how the concept of abstraction in Mathematics allows us to generalize and solve a wide range of problems with single theorem.

A proficient C++ developer, thus, can leverage these paradigms to architect your project in such a way that it is both efficient and easily adaptable to changes.

• Compatibility and Interoperability

C++ is highly compatible with C, allowing code written in C to be run in a C++ environment with minimal modifications. This feature, coupled with its ability to run on many hardware and operating systems, makes C++ a universal language in the tech world. Drawing a parallel to Linguistics, the way Latin roots are integrated in many languages, elevating their expressiveness and richness, C++ empowers developers with a broad scope of influence over diverse tech stacks.

Beyond this, C++ also allows for interoperability with other languages. This means, elements from different programming languages can coexist and interact, bringing the benefits of various technologies to your project. A C++ developer can tap into this potential to create a polyglot architecture, combining the best of different languages to optimize your project.

To conclude, a C++ developer is not just a coder, but a craftsman who meticulously shapes system resources to build an efficient and adaptable product. Armed with the tools that C++ provides and the cognitive ability to leverage them, a C++ developer could be the key to unlocking your project's full potential. From low-level system programs to high-performance trading algorithms, a C++ developer offers a vast spectrum of capabilities that can be tailored to the requirements of your project, providing you with an edge in this competitive tech landscape.