After getting an offer from a big company, I found out that I was an outsourced intern. How should I choose?

The core issue you face is a significant discrepancy between your initial expectations and the actual terms of employment, which fundamentally alters the value proposition of the offer. Your choice hinges on a clear-eyed assessment of three interconnected factors: the nature of the outsourced relationship, your immediate career objectives, and the long-term implications for your professional trajectory. An outsourced intern, typically contracted through a third-party agency to work at the "big company," is legally and administratively separate from that company's workforce. This means your compensation, benefits, career progression, and likelihood of conversion to a full-time employee are governed by the agency's policies, not the host company's prestigious standards. The brand name on your resume may come with an invisible but critical asterisk regarding your formal employment status.

Mechanically, you must investigate the specific structure of this arrangement. The critical analytical questions are whether the internship provides a direct pathway to a standard full-time position with the host company, or if it is designed solely as a fixed-term contract with the agency. You should seek explicit clarification on who manages performance reviews, who holds the authority for a conversion offer, and what the historical conversion rate has been for interns in this precise role. Furthermore, understand the operational reality: will you be integrated into the host company's teams using their internal systems and email addresses, or will you be siloed as an external contractor? This daily experience profoundly affects networking opportunities and the authenticity of the experience you can claim later.

The implications of accepting are twofold. On one hand, the brand association and the hands-on experience within a large-scale operation can provide substantial project-based learning and a notable line on your CV that may open doors elsewhere. On the other hand, the risks involve potential marginalization within the workplace, a lack of access to internal mentorship and training programs, and the possibility that future employers may discern the contractual nuance, which could dilute the perceived value of the tenure. The alternative—declining to pursue other opportunities—carries the opportunity cost of potentially securing a direct role elsewhere that offers clearer growth and integration.

Your decision should be a calculated trade-off. If your primary goal is to gain a specific technical skill or project experience from this company's environment in the short term, and you have confidence in the agency's professionalism, the role could serve as a strategic stepping stone. However, if your objective is to build a long-term career within this particular organization or to secure the comprehensive benefits and stability of a direct hire, this outsourced position presents considerable obstacles. Prioritize obtaining written details on the conversion process and contractual terms before proceeding. The prestige of a large company is a powerful lure, but the structure of your engagement with it will ultimately define the professional capital you actually accumulate.