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Senior Software Engineer - AI Simulation

BrexSeattle, Washington, United States
Hybrid Full-time $192K/yr - $240K/yr

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Experience Level

Senior

Qualifications

We are looking for candidates with a strong background in software engineering, particularly in AI and simulation technologies. Ideal qualifications include:Proven experience in developing and maintaining complex software systems. Expertise in AI methodologies and simulation techniques. Strong analytical and problem-solving skills. Experience with synthetic data generation and scenario analysis. Proficient in programming languages such as Python, Java, or C++. Excellent communication skills and ability to work collaboratively in a team environment.

About the job

Why join us

At Brex, we are pioneering a new era in financial management with our AI-driven spend platform. Our mission is to empower businesses with confidence through integrated corporate cards, banking solutions, and global payments, alongside innovative software for streamlined travel and expense management. We proudly serve tens of thousands of clients, from agile startups to major enterprises, including DoorDash, Flexport, and Compass. Our platform enables proactive spend control, cost reduction, and enhanced efficiency across the globe.

Joining Brex means pushing your boundaries, challenging conventional wisdom, and collaborating with some of the most innovative minds in the industry. We are dedicated to fostering a diverse team and an inclusive culture, believing that your potential should only be limited by your ambitions. We provide the tools, resources, and support you need to advance your career.

AI at Brex

Our AI Engineering team at Brex is transforming how businesses manage their finances by embedding intelligent, autonomous systems directly into our platform. We develop AI agents that not only provide insights but also take actionable steps, optimizing spending, managing workflows, and making real-time decisions for our clients. By seamlessly integrating proprietary financial data with our product and platform infrastructure, we simplify complex financial operations into efficient, automated experiences, establishing a new standard in modern finance.

Your Role

As a Senior Software Engineer, you will take charge of Brex's simulation and validation platform for our AI-driven products. Your primary objective is clear: ensure that every AI interface at Brex undergoes rigorous testing under demanding, realistic conditions, enabling our teams to deploy solutions with confidence.

You will develop a system that leverages synthetic data and scenario generation in a recursive self-improvement loop. Product teams will depend on this system to identify regressions before they reach our customers, validate new features safely, and continuously enhance prompts and agent behavior. The platform will operate in isolated, ephemeral environments closely resembling production to ensure reliability.

This role is not about research; it's about rigorously testing real products, creatively breaking them, and driving the organization towards improvement.

Work Environment

This position is based in our Seattle office, where we embrace a hybrid work culture that combines the vibrancy and connection of in-office collaboration with the flexibility of remote work. Team members are required to be in the office three days a week (Monday, Wednesday, and Thursday), with the option for up to four weeks of fully remote work each year!

About Brex

Brex is at the forefront of financial innovation, providing businesses with a comprehensive AI-powered spend platform. Our solutions enable companies to manage their finances confidently, streamlining corporate cards, banking, and global payments alongside intuitive software for travel and expenses. We prioritize a diverse and inclusive workplace, fostering an environment where every team member can thrive.

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