Principal Software Engineer, Amazon Shipping

You will build the optimization brain for Amazon's externalized logistics network — a system that couples first-mile route planning with middle-mile network optimization into a joint iterative loop, producing end-to-end recommendations that no single optimizer can reach alone. The technical challenge is real: solvers that take hours per run, a combinatorial search space that defies brute-force, model gaps that require deep-diving into solver internals, and convergence that must be proven across…