San Francisco is emerging as the preferred destination for startups, including those outside the AI sector, thanks to its unparalleled concentration of tech talent and investor capital. Data shared exclusively with TechCrunch by VC firm SignalFire reveals that the San Francisco Bay Area houses 49% of all big tech engineers and 27% of startup engineers in the U.S., making it the largest tech employment hub in the country. Moreover, this region is home to 12% of the most prominent VC-backed founders and 52% of startup employees, reinforcing its status as a critical center for tech innovation and growth.

Despite narratives suggesting a decline in San Francisco’s tech scene, SignalFire partner Josh Constine argues otherwise, emphasizing that the city’s dominance has only increased, particularly in the wake of the recent AI boom. This resurgence is attracting international founders who see San Francisco as a vital ecosystem for scaling their ventures.

Founders like Daniel Lenton of Unify have relocated from cities like Berlin to San Francisco, citing the benefits of proximity to other tech startups and frequent interactions with potential partners and investors. Lenton, who secured $8 million in funding from investors including SignalFire and Microsoft’s M12 Capital, noted that while remote engagement with investors was possible, being physically present in San Francisco allowed for more spontaneous, collaborative opportunities, such as informal brainstorming sessions with other AI tech startups.

Similarly, Anh-Tho Chuong, co-founder and CEO of Lago, an open-source billing platform, has moved her company from Paris to San Francisco. Despite considering New York for its convenience, Chuong observed a revitalized tech scene in San Francisco, with numerous founders returning. Chuong emphasized the advantage of San Francisco’s concentrated talent and customer pool, which she believes provides better opportunities for hiring and networking compared to other cities.

The appeal of San Francisco lies not just in structured events but also in the serendipitous encounters that occur within its dense tech community. Chuong and Lenton both highlighted the value of these organic interactions, which often lead to collaboration and support. As Y Combinator partner Diana Hu puts it, San Francisco offers a unique environment where founders can “manufacture luck,” making it an attractive destination for startups looking to scale.