Avoid the most common attack vectors: SQL injections, XSS and known vulnerabilities. We can keep your app up-to-date, add unit tests and do regular code review to improve quality.
Your app is too slow or you need to scale and don't know what to do? Don't get stuck, there're many things we can try: split slow queries into multiple queries (remove joins), group multiple queries into one (N+1 problems), code profiling, reduce impact of garbage collector, etc.
Together we can find solutions to your problem.
Allow multiple internal systems to discuss together, integrate your application with an external API or provide an external API for your application. Create a REST service in JSON or XML, provide single sign-on.