A city like Karachi would require a variety of computer services to cater to its diverse needs. Here are some essential computer services that a city like Karachi might need:

1. IT Infrastructure Management: Managing and maintaining the city's IT infrastructure, including servers, networks, and data centers, to ensure smooth operations.

2. Network Security: Implementing robust security measures to protect the city's computer networks from cyber threats, such as hacking, data breaches, and malware attacks.

3. Software Development: Developing customized software solutions for various city departments and agencies to improve efficiency, automate processes, and enhance citizen services.

4. Website Development and Maintenance: Creating and managing websites for city government departments, public services, and initiatives to provide information and interact with citizens.

5. Database Management: Designing and managing databases to store and analyze critical city data, such as population demographics, public services usage, and infrastructure statistics.

6. E-Government Solutions: Implementing electronic government systems to streamline administrative processes, enable online services, and facilitate citizen-government interactions.

7. Geographic Information Systems (GIS): Developing and maintaining GIS platforms to manage spatial data, map resources, and support urban planning, transportation, and emergency response.

8. Cybersecurity Services: Providing cybersecurity services to protect city infrastructure, systems, and sensitive data from cyber threats, including real-time monitoring, incident response, and vulnerability assessments.

9. IT Support and Helpdesk Services: Offering technical support services to city employees and citizens, addressing IT issues, troubleshooting hardware/software problems, and providing guidance.

10. Data Analytics and Business Intelligence: Utilizing advanced analytics tools and techniques to extract insights from city data, enabling data-driven decision-making and optimizing resource allocation.

11. Cloud Computing Services: Assisting in the migration of city systems and data to cloud platforms, providing scalability, cost-effectiveness, and easy access to resources.

12. Mobile Application Development: Creating mobile apps for citizens to access city services, receive alerts, report issues, pay bills, and engage in civic activities.

13. Telecommunication Infrastructure: Planning and deploying reliable and high-speed telecommunication networks to support efficient communication within the city.

14. Disaster Recovery and Business Continuity Planning: Developing strategies and protocols to ensure the city's critical IT systems can recover quickly after a disaster and maintain essential services.

15. Technology Training and Education: Conducting workshops, seminars, and training programs to enhance digital literacy and skills among city employees, citizens, and businesses.

These are just a few examples of computer services that a city like Karachi would need. The specific requirements may vary based on the city's priorities, size, and developmental stage.