Senior Software Engineer, Back End

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 real-time visibility, and control spend effortlessly. Brex’s AI-native automation and world-class service eliminate manual expense and accounting tasks for customers so they can focus on what matters most. Tens of thousands of the world's best companies run on Brex, including DoorDash, Coinbase, Robinhood, Zoom, Plaid, Reddit, and SeatGeek.

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 Senior Software Engineer on our Task Workflows Platform team, you will build and scale the foundational backend systems that power core experiences across Brex. You will work across our extensive suite of platforms, including our multi-channel notifications engine, collaborative commenting system, and dynamic workflow rule builder. You will also play a pivotal role in evolving our task orchestration infrastructure, helping us transition from a centralized, generic experience into highly tailored, purpose-built solutions for specific product domains.

You will tackle complex distributed systems challenges, from designing scalable APIs and rule-evaluation engines for custom automations to modeling the data and orchestration logic behind our domain-specific task experiences. Because teams across Brex build on these platforms, extensibility and ease of adoption matter as much as scale and reliability. Beyond core platform work, you will be part of a team that directly shapes broader product experiences, including leveraging AI to streamline user workflows. As Brex builds more AI-native products, you will also have the opportunity to help build the shared infrastructure that enables AI product development across the company.

Where you’ll work

This role will be based in Sao Paulo 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 three coordinated days in the office per week on 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

7+ years of professional experience designing, developing, and deploying full-stack products

Strong proficiency in backe