1. HR Screening: An initial conversation with HR to discuss your background, career goals, and basic fit for the role and company culture.

2. Technical Round 1: A technical interview focusing on foundational coding skills, data structures, and algorithms. You may be asked to solve coding problems and explain your approach.

3. Technical Round 2: A more advanced technical interview that may include complex problem-solving, system design, or deeper discussions on relevant technologies like cloud platforms, microservices, or distributed systems.

4. Techno-Managerial Round: A mix of technical and behavioral questions to assess your problem-solving approach, teamwork, and decision-making. You may discuss past projects and scenarios that highlight your leadership and collaboration skills.

5. Final HR Discussion: The concluding HR round to cover any remaining questions regarding compensation, benefits, and next steps in the hiring process.

Design a high-level architecture for a chat application and explain it.