Senior Software Engineer, Application Infrastructure

Engineering at Brex

The Engineering team includes Data, IT, Security, and Software, and is responsible for building innovative products and infrastructure for both internal and external users. We have multiple autonomous and collaborative teams who are eager to learn, teach, and constantly improve how things work. Together, we strive to build robust and scalable systems that enable Brex to grow rapidly and help our customers reach their full potential.

What you’ll do

The Application Infrastructure team sits in the Infrastructure group alongside Release Infrastructure and Cloud Infrastructure. We simplify writing code for every product developer at Brex.

As an engineer on the Application Infrastructure team, you will build and own a suite of platforms and tools that Product Engineers use to deliver quality software solutions quickly. You will have the opportunity to work with a diverse range of technologies enabling federated GraphQL APIs, remote development environments, pre-merge testing, Brex-wide dependency management, fast Kotlin builds, developer CLIs, and more.

You will be a domain expert and change agent taking our Federated GraphQL platform to the next level. You’ll see the big picture of how Brex developers use GraphQL to build products, and utilize GraphQL’s open source and vendor ecosystem to enable Brex devs to ship better products faster.

You will need to be comfortable regularly working on complex systems across multiple programming languages and levels of abstraction. You will have the opportunity to learn and push the frontier of providing the best financial software experience to help companies grow. You will be encouraged to be metric and data-driven and to think creatively to help Brex scale into new markets and verticals.

Where you’ll work

This role will be based in our Sao Paulo office. You must be willing to work in office at least 2 days per week on Wednesday and Thursday, starting the week of September 1st, 2025. when we open our Sao Paulo office. Employees will be able to work remotely for up to 4 weeks per year, for a minimum of one week at a time.

Responsibilities

• Design and build robust platforms and tools to accelerate Brex product development
• Own and maintain critical API infrastructure serving hundreds of requests per second
• Identify and implement reliability and performance improvements in our backend stack
• Uphold our high engineering standards and bring consistency to the codebases, infrastructure, and processes you will encounter

Requirements

• 5+ years of professional experience in a software engineering role
• GraphQL experience, especially familiarity with Federated GraphQL
• Kotlin background (Java and Scala are also acceptable)
• Kubernetes familiarity
• Platform or Full-Stack development background
• Strong communication, interpersonal, and project planning skills
• English proficiency/fluency, both written and speaking (note: interviews will be conducted in English)
• Must be willing to work in office 2 days per week on Wednesday and Thursday, starting September 1st, 2025 when we open our Sao Paulo office

Bonus points

• Experience working with Bazel; bonus points if you’ve written rules or maintained Bazel as a platform
• Extensive experience with other multi-language build systems
• Golang experience, especially building CLIs
• Experience extending IDEs

Location

• Must be working in Brazil at the start of role