Senior Software Engineer, Accounting Engineering

Requisitos

• **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 the Accounting Engineering team, you will build the platform and product surfaces that turn Brex activity into accurate, usable accounting data
• Accounting is a core component of our product offering and often a strategic differentiator
• Your focus will be the systems finance teams depend on to close their books: reusable accounting records, rules, and mappings, reliable ERP integrations with NetSuite, QuickBooks, Xero, and others, and AI-native automation that predicts accounting work while keeping customers in control
• You will work across APIs, data models, and distributed systems where correctness and auditability are non-negotiable, while collaborating with product teams across Brex to extend accounting capabilities without one-off solutions. **Where you'll work** This role will be based in our São 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: Monday, Wednesday, and Thursday
• As a perk, we also have up to four weeks per year of fully remote work. **Responsibilities** - Build and maintain the core accounting platform, including reusable records, rules, mappings, and versioned APIs that Brex product teams and external partners extend without one-off solutions. - Own ERP connectivity end-to-end, building and scaling reliable integrations with NetSuite, QuickBooks, Xero, SAP, and Oracle, including sync, error recovery, and rate-limit handling. - Implement customer-facing close experiences for reviewing, configuring, reconciling, and exporting financial activity in our React/TypeScript dashboard. - Collaborate with Product, Design, Data Science, and Implementation teams to translate complex accounting and ERP concepts into experiences that feel simple for finance teams. - Design distributed systems where correctness is non-negotiable, making idempotency, reconciliation, traceability, and proactive issue detection first-class parts of the architecture. - Own problems end-to-end, from user experience and API design to data models, scalability, and ongoing observability. - Work with ML models in production, integrating predicted GL coding and mappings into accounting workflows while preserving explainability and human review. - Participate in on-call rotation and maintain high operational standards for mission-critical systems. **Requirements** - 5+ years of full-time software engineering experience with a focus on backend development. - 2+ years of experience building systems in a domain where correctness and reliability were core requirements, such as fintech, payments, financial systems, or another regulated industry (e.g. healthcare, legal). - Strong curiosity for digging deep into the technical problems, and a track record of owning significant technical scope and delivering high quality solutions. - Experience designing APIs, data models, and platform capabilities that serve many different customer workflows and configurations. - Proficiency in backend technologies (e.g., Kotlin, Java, TypeScript) and comfort with our stack (Kotlin and Micronaut). - Experience architecting, developing, and testing full-stack applications end-to-end. - Comfort working with databases (e.g., PostgreSQL), event streaming (e.g., Kafka), and distributed systems. - A high bar for engineering standards: code quality, testing, observability, and operational excellence, and a habit of raising that bar in others through review and mentorship. - Strong written and verbal English communication and interpersonal abilities. **Bonus points** - Direct experience with accounting systems or ERPs such as NetSuite, QuickBooks, Xero, SAP, or Oracle, either building integrations or working with them as a practitioner. - Familiarity with accounting concepts such as the monthly close, general ledger coding, reconciliation, or double-entry bookkeeping. - Experience building third-party integrations at scale, including handling partner API limits, schema drift, and asynchronous failure recovery. - Experience shipping ML- or LLM-powered product features, particularly where explainability and human review matter. - Experience with platform or API products consumed by other engineering teams or external developers. - Experience leading technical design across multiple teams or mentoring engineers as a formal or informal tech lead