Senior Business Analyst

About the client:

Our client an award-winning global tax services and software provider is the largest Firm in the world dedicated exclusively to business taxes. With global headquarters in Dallas Texas the Firm provides an integrated suite of federal state local and international tax services on a multijurisdictional basis including tax recovery consulting advocacy compliance and technology services.

About Project: We are developing an API Engine for B2B SaaS platform that enables VAT compliance across multiple jurisdictions ERP systems and external tax authority APIs. The role focuses on transitioning complex system logic into a modern integration-driven architecture while maintaining interoperability with existing core systems.

Responsibilities:

• Collaborate with Product Engineering and Architecture to elicit functional and non-functional requirements for the API Engine identify implicit assumptions edge cases and dependencies
• Translate high-level concepts into: epics features and well-structured user stories with clear acceptance criteria (functional non-functional)
• Define requirements for public and partner-facing APIs ERP system integrations (API-only hybrid file-based where relevant) external tax authority APIs with differing schemas SLAs and behaviors
• Capture data contracts and payload expectations error handling retries idempotency versioning authentication and authorization flows
• Work closely with engineering to ensure requirements explicitly cover: security (API keys secrets access control auditability) performance and scalability observability (logging traceability error visibility) compliance and regulatory constraints backward compatibility and migration from legacy systems
• Help define requirements that allow coexistence with a legacy platform until the latters sunset and gradual migration paths for customers and integrations
• Act as a bridge between product intent engineering reality external integration expectations

Requirements

• Minimum 5 years of commercial experience as a Business Analyst.
• Proven track record working on API-first products and integration-heavy B2B SaaS platforms.
• Experience managing requirements for complex ecosystems including ERP integrations and hybrid platform coexistence.
• Deep understanding of Agile delivery with a focus on creating shippable value and reducing ambiguity.
• Exceptional ability to translate technical complexity for stakeholders and collaborate effectively with architects and developers.
• Upper-Intermediate to Advanced English (written and verbal).

Nice to Have

• Prior work in regulated domains (finance tax payments compliance)
• Familiarity with ERP ecosystems (e.g. SAP Oracle NetSuite Dynamics) and government or authority APIs
• Experience with event-driven or asynchronous integrations and multi-tenant SaaS platforms