Senior Software Engineer, AI - Simulation

Brex

about 3 hours ago

San Francisco, CA, USA

Senior

H1B Sponsor

Base Salary

$192k - $240k/yr

Responsibilities

Evolve and scale a simulation and validation platform to continuously stress-test Brex’s AI products using large-scale synthetic data.
Develop evaluation mechanisms to detect regressions, edge cases, and failure modes in non-deterministic systems prior to customer impact.
Run continuous testing in isolated, production-like environments and set quality gates, including authority to block launches when standards are not met.
Partner closely with product engineering teams to improve system testability, isolation, and overall robustness.
Define and uphold company-wide standards for AI feature quality, using simulation-driven insights to guide prompt and system evolution.

Experience building and owning complex software systems where correctness, reliability, and failure modes are critical.
Experience designing test, simulation, or validation systems for non-deterministic or high-stakes environments.
Strong systems thinking, with the ability to decompose complex problems and reduce incidental complexity.
Demonstrated ability to influence product architecture through quality, reliability, and launch-readiness constraints.
Comfort operating with real authority and cross-team influence, including blocking launches and partnering across seniority levels to raise the quality bar.

Hybrid work environment with three coordinated days in the office and up to four weeks of fully remote work per year.