Senior Software Engineer, Full-Stack

Why join us

Brex is the AI-powered spend platform. We help companies spend with confidence with integrated corporate cards, banking, and global payments, plus intuitive software for travel and expenses. Tens of thousands of companies from startups to enterprises — including DoorDash, Flexport, and Compass — use Brex to proactively control spend, reduce costs, and increase efficiency on a global scale.

Working at Brex allows you to push your limits, challenge the status quo, and collaborate with some of the brightest minds in the industry. We’re committed to building a diverse team and inclusive culture and believe your potential should only be limited by how big you can dream. We make this a reality by empowering you with the tools, resources, and support you need to grow your career.

Engineering at Brex

Engineering at Brex is about building systems that scale with speed and intention. Our teams span Software, Data, Security, and IT, and operate with high autonomy and deep collaboration. We tackle hard technical problems, own our outcomes, and push for excellence at every level — from architecture to deployment. It’s an environment where engineering is a craft, and builders become leaders.

What you’ll do

As a Full-Stack Senior Software Engineer on our Users team, you will work across the entire Brex stack to build solutions that manage user lifecycles and integrate with HRIS systems - core to support all Brex products and critical for maintaining enterprise onboarding processes. You will have the opportunity to learn and push the frontier of providing the best enterprise onboarding processes and supporting a large, high-performing engineering team.  You’ll be encouraged to be metric and data-driven and to think creatively to help Brex scale and get prepared for the new markets we are about to enter. 

We’re looking for folks with not only an interest in building products and tools but also in leading multi-functional projects with lots of moving pieces. In this role, you’ll have the opportunity to drive direct business impact and shape our long-term technical vision with a high-quality bar.

Where you’ll work

This role will be based in our Seattle office. We are a hybrid environment that combines the energy and connections of being in the office with the benefits and flexibility of working from home. We currently require a minimum of two coordinated days in the office per week, Wednesday and Thursday. Starting February 2, 2026, we will require three days per week in the office - Monday, Wednesday, and Thursday. As a perk, we also have up to four weeks per year of fully remote work!

Responsibilities

• Work with engineers across the company to build new features and products end-to-end
• Own problems end-to-end, thinking through everything from user experience, data models, scalability, operability and ongoing metrics.
• Provide technical leadership to team by driving roadmap direction, architectural design and mentorship
• Work side-by-side with user-facing teams (Sales, Support) to best understand the needs of our customers.
• Tune and polish features to a high degree of excellence.
• Identify and implement reliability and performance improvements
• Uphold our high engineering standards and bring consistency to the codebases, infrastructure, and processes you will encounter

Requirements

• 8+ years of professional experience with a focus on frontend development with React alongside designing, developing, and deploying full-stack products
• Experience developing software for the Web platform, including cross-browser compatibility
• Experience in architecting, developing, and testing client-side code end-to-end
• Experience building and designing scalable backend systems
• Platform or Full-Stack development experience preferably in Kotlin(Java, Scala and Groovy are also acceptable)
• Experience with modern technologies and tools like ES6+, React, Typescript, GraphQL & Webpack
• Experience working with SQL or NoSQL databases
• Kubernetes familiarity
• Experience Tech Leading projects across a group of engineers

Bonus points

• Experience collaborating with cross-functional stakeholders and specialists in product, design, and operations
• Experience in Tech Leading teams
• Experience driving initiatives at a broader level across an organization or company
• Experience running in-product experiments, A/B testing
• Experience and interest in leveraging AI developer tools
• Effective writing skills
• Track record of identifying and fixing problems.

Compensation

The expected salar