Senior Software Engineer, AI - Simulation
Why join us Brex is the intelligent finance platform that enables companies to spend smarter and move faster in more than 200 markets. By combining global corporate cards and banking with intuitive spend management, bill pay, and travel software, Brex enables founders and finance teams to accelerate operations, gain re
What this role actually needs.
Why join us Brex is the intelligent finance platform that enables companies to spend smarter and move faster in more than 200 markets. By combining global corporate cards and banking with intuitive spend management, bill pay, and travel software, Brex enables founders and finance teams to accelerate operations, gain re 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, while driving the technical bar for a small, high-impact team. - Experience building and owning complex software systems where correctness, reliability, and failure modes are critical. Requirements: - 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. - Previous experience on simulation or testing of inherently complex systems (AI/ML, distributed systems, robotics, IoT, medical devices, aerospace, defense, etc.). Benefits: - 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, while driving the technical bar for a small, high-impact team. - Experience building and owning complex software systems where correctness, reliability, and failure modes are critical. Company context: Brex is the spend platform combining corporate cards, expense management, banking, and bill pay for growing companies.
Day-to-day expectations
Brex lists these responsibilities for the Senior Software Engineer, AI - Simulation role.
- 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, while driving the technical bar for a small, high-impact team.
- Experience building and owning complex software systems where correctness, reliability, and failure modes are critical.
What a strong candidate brings
These requirements are extracted from the source listing and normalized for UpJobz readers.
- 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.
- Previous experience on simulation or testing of inherently complex systems (AI/ML, distributed systems, robotics, IoT, medical devices, aerospace, defense, etc.).
Why people would want this job
Brex published these compensation, benefits, or working-context details with the role.
- 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, while driving the technical bar for a small, high-impact team.
- Experience building and owning complex software systems where correctness, reliability, and failure modes are critical.
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Senior Software Engineer, AI - Simulation is framed against UpJobz source checks, country scope, compensation visibility, and work-authorization signals so candidates can make a faster go/no-go decision.
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Source: brex.com · Source ID: 8442494002 · Confidence: 88/100 · Last checked: May 7, 2026
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