Senior Software Engineer, Accounting Engineering

The shape of it

In the posting’s own words

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.

What it asks for · 9

• 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.

Also a plus

• 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.

What the job covers

• 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.

Tools and skills named

Words the posting leans on

• experience12×
• accounting11×
• systems9×
• engineering7×
• product7×
• data6×
• building5×
• design4×
• e.g4×
• erp4×
• integrations4×
• platform4×
• technical4×
• api3×
• close3×
• core3×

Counted from the posting after the mission statement and the legal notices are set aside. The ones near the top are the ones a screener is looking for.

More open at Brex

• Account Executive, Small BusinessSalt Lake City, Utah, United States
• Account Executive, Small BusinessNew York, New York, United States
• Account Executive, Small BusinessSan Francisco, California, United States
• Account Executive, YCSan Francisco, California, United States
• Account ManagerSan Francisco, California, United States
• AI Engineer, EcosystemSan Francisco, California, United States