Wa alaikum assalam. In Islamic principles, working in a technical capacity for financial institutions such as Capitol One or Visa, as you mentioned, is generally permissible as long as the job responsibilities do not involve engaging in haram (forbidden) activities. Here are some key considerations:

Nature of the Job: Ensure that the role you are considering does not involve any haram activities, such as directly dealing with interest (riba) or engaging in unethical practices. For example, working on software enablement and digital transformation projects that support the institution's operations, security, or customer experience would generally be permissible.

Compliance with Islamic Principles: Make sure that the company's policies and practices align with Islamic principles. Avoid involvement in activities that contradict Islamic values, such as promoting or facilitating interest-based transactions or engaging in fraudulent practices.

Ethical and Halal Investments: Consider the source of the institution's revenue and the nature of its business operations. If the financial institution's primary income is generated from halal sources and activities, and it operates within the bounds of Islamic principles, working for such an organization would be more favorable.

Personal Intentions and Development: Examine your own intentions and motivations for seeking employment with a financial institution. If your intention is to contribute positively, provide ethical solutions, and facilitate beneficial services, then your work can be seen as a means of earning a lawful livelihood and making a positive impact.

It is recommended to consult with knowledgeable scholars or individuals well-versed in Islamic finance and ethics to seek guidance specific to your circumstances and to ensure your actions align with Islamic principles.