To ensure scalability: 1. Adopt Modular Design: Build components that are reusable and loosely coupled. 2. Use Scalable Architecture: Choose patterns like microservices or serverless. 3. Plan for Load Growth: Incorporate caching, database optimization, and load balancing. 4. Regularly Refactor: Update the codebase to address growing demands. 5. Monitor Performance: Use analytics to identify and resolve bottlenecks proactively. A forward-thinking approach keeps your software ready for future growth.

Moving away from traditional monolithic systems needs to understand the pain point in existing systems. Complete redesign with modular and micro services with focus on short lived task ported on server less architecture. Modern browser engines provides modularity and adaptability to various mobile devices

It's important to remember that while technical solutions like microservices are important, framing them within the context of business needs and priorities is what will likely help your customers and organization the most. Therefore, to ensure scalability, prioritize understanding your current needs and growth trajectory. Aligning your scaling strategy with immediate revenue goals (3, 6, 12 months) is crucial. While microservices offer a solution, focus on strategically breaking down the most impactful components first. Identify common functionalities across your organization for efficient decomposition and reuse. This targeted approach optimizes scalability while aligning with your current business objectives.

Implementing an observation system that takes note of as many events as possible especially if they don’t make sense. The system should record the whole what where how when and ideally why of an event. With enough observations patterns of usage both expected and unexpected will appear showing the weakness in the design. Once these patterns are found it is easy to forecast what is going to happen and from that knowledge take action to modify and strengthen the system helping address future problems ideally before they are needed.

Question is too general to give a specific answer and there are hundreds of articles with bullet point answers. Prevention is better than cure: implement measures to identify scalability challenges i.e. use telemetry hooks throughout code and use a robust client - dont write your own, automate load and stress testing early on, implement an excellent logging strategy (incorporated with telemetry), monitor your databases and identify slow queries as they arise. One of the hardest problems to resolve is memory leaks so incorporate tests to catch them early.