Callum Costello

Callum Chay Costello has built his career on turning complex hiring challenges into clear success stories. Starting his journey in Supply Chain & Procurement before transitioning into Life Sciences recruitment, Callum brings over six years of industry experience and a uniquely well-rounded perspective. His early delivery-focused role gave him the chance to speak with candidates across the globe—from the EU to the US—shaping a broad understanding of functions ranging from discovery science through to C-suite leadership across both permanent and contract positions.

Now based at the London HQ, where he works specifically for Discover, Callum partners primarily with pharma and biotechnology organisations across the UK and Europe, supporting their growth in discovery-driven areas. While his strongest specialisms sit firmly in Regulatory and Clinical—where he has made the majority of his placements—his track record extends far beyond these functions. Over the years, he has successfully placed professionals across diverse areas including HR, Operations, and even CFO roles, bringing flexibility and value to clients seeking a truly versatile recruiter.

Callum’s reputation is rooted in his style: relationship-driven, detail-oriented, and consistently transparent. He approaches every conversation—whether with a client or candidate—with an authentic, human touch. Having once been a candidate himself, he knows the importance of empathy, honesty, and clarity. This is why the people he works with often highlight his speed, efficiency, and ability to think creatively—especially when identifying exceptional talent others might overlook.

What motivates Callum most is the impact of the work. In life sciences recruitment, each placement represents more than a career move; it’s a step toward solving unmet medical needs, improving patient outcomes, and supporting breakthroughs in science. He is driven by the opportunity to learn every day from highly skilled professionals who have spent years honing their expertise—and by the knowledge that the right placement can accelerate meaningful change.

Across the UK, Ireland, Europe, and previously in the US and China, Callum aims to deliver candidates who not only solve immediate challenges but also bring character, ambition, and long-term value to their teams. His ability to speak to people from all walks of life, combined with his broad functional exposure, means he can support roles others may shy away from—ultimately helping clients access talent they didn’t even realise they needed.

Callum’s professional ethos is captured in his personal motto: “Finding the needle in the Chaystack.” It reflects both his name and his commitment to uncovering those rare, exceptional individuals who make a true difference. For him, recruitment isn’t just about filling roles—it’s about connecting people, enabling progress, and supporting innovation in a field that changes lives globally.