Senior Software Engineer, Allocation & Onboarding

About Handshake Handshake was founded on a simple belief that everyone deserves a path to a great career, regardless of where they went to school or who they know. Today, we power 25 million job seekers, 1 million+ employ $ers, and 1,600 educational institutions. In 2025, we started Handshake AI and built the fastest-growing AI data business in history. We work directly with frontier AI lab researchers to create evaluations, publish benchmarks, and push the boundary of data. We've grown from $0 to ~$1B run rate and pay ~$60M to over 30K individuals every month. Why join Handshake now: Shape how every career evolves in the AI economy, at global scale, with impact your friends, family, and peers can see and feel. Partner hand-in-hand with world-class AI labs, Fortune 500 partners, and the world's top educational institutions. Work together with engineers, scientists, operators, and more from Palantir, Meta, Scale AI, and former YC founders. Build a massive, fast-growing business with billions in revenue. About Handshake AI Human data is the core infrastructure to AI advancement. Frontier AI labs currently improve model capabilities with various data-intensive post-training techniques. We believe that data spend for AI training will increase by 3–5x in the next few years and continue for much longer as models take on new domains. Handshake AI supports all of the frontier AI labs, working on their most complex data at the largest scale. About the Role As Senior Software Engineer on the Allocation & Onboarding (A&O) team, you have the opportunity to own the full stack of impact—from the experiences our fellows rely on every day to the foundational systems that make those experiences possible. Sitting at the intersection of product engineering and operational scale, you'll partner closely with Growth, Product, Operations, ML, and Platform Infrastructure to translate rapidly evolving business needs into intuitive, high-quality product experiences and reliable, scalable platform capabilities. As AI continues to reshape how people learn, work, and build careers, you'll help define the consumer experience that sets our fellows up for success while building the flexible technical foundations that enable the business to evolve just as quickly. Whether you're shipping customer-facing features, modernizing core infrastructure, or designing resilient architectures, your work will have a direct and lasting impact on both our users and our ability to innovate at scale. This is a highly collaborative, high-impact role that requires deep partnership across engineering and business teams. Success requires strong technical fundamentals, systems thinking, and excellent communication, along with the judgment to balance rapid execution with thoughtful long-term engineering decisions. We're looking for engineers who are excited to take ownership of meaningful problems, influence technical direction, and help shape not just what we build, but how we build it. In this role, you will: Build and own core experiences across the fellow platform, including onboarding, fellow homepage, project opportunities, Design and build \ systems to power fellow allocation, helping evolve manual operational workflows into scalable platform capabilities. Partner closely with Growth, Operations, Product, and ML to understand business processes and translate them into high-quality technical solutions. Lead projects end-to-end, from technical design and implementation through rollout and continuous iteration. Drive architectural improvements that reduce technical debt and establish scalable service layers as the platform continues to grow. Balance speed and quality by making thoughtful engineering tradeoffs that support both immediate business needs and long-term maintainability. Collaborate across teams to build reliable, secure systems that improve both the fellow and operator experience. Mentor other engineers through technical leadership, project ownership, and strong en