Finance Integration Specialist - S2P, SQL, e-Invoicing, Peppol

Finance Integration Specialist (S2P) SQL, CTC, e-Invoicing, JSON, PEPPOL, Data Mapping, Data Modelling - Global

Outstanding opportunity to join this famous, global law firm within their Finance function to support the strengthening of their global e-invoicing and continuous transaction controls (CTC) capabilities. Were looking for an Integration Specialist to play a pivotal role in this transformation.

This is a hands-on hybrid role blending business analysis, integration design, data modelling, and financial process expertise . Youll work across multiple global jurisdictions, partnering with Finance, Tax, IT, and local offices to deliver compliant, scalable, and high-quality integrations.

Required Experience:

• Proven experience designing integration solutions for e-invoicing & CTC across multiple jurisdictions.
• Working knowledge of PEPPOL, UBL 2.1, JSON / XML schemas, and digital certificates/signatures .
• Strong SQL skills to support the generation of JSON / XML files
• Strong understanding of Source to Pay inc. VAT, self-billing, credit notes, withholding, FX, and tax determination.
• Hands-on integration skills: REST/JSON APIs, XML/UBL, file/batch interfaces , and familiarity with iPaaS/middleware
• Strong Data modelling, canonical modelling and Data Mapping skills
• Experience with PMS or ERP systems (e.g. Elite 3E, Aderant, SAP, Oracle), e-invoicing gateways, and tax engines (e.g. ONESOURCE, Vertex).
• Strong understanding of AP/AR processes, invoice lifecycle, GL coding, cost centres, and master data.
• Excellent documentation skills (specs, mapping workbooks, sequence/data flow diagrams, control documentation).
• Experience working in Agile environments with matrixed stakeholders.
• Strong stakeholder management and clear, concise communication.
• 7+ years in Business Analysis / Integration roles with a track record in e-invoicing & CTC programmes.

What Youll Do:

• Gather and document business, functional, and non-functional requirements for e-invoicing/CTC compliance.
• Map current-state AP/AR, tax, and reporting processes; define future-state operating models.
• Analyse data ownership, lineage, quality rules, and reconciliation needs across PMS/ERP, billing, tax engines, data warehouses, and e-invoicing platforms.
• Build canonical data models for invoices, credit/debit notes, and adjustments.
• Define field-level mappings between internal schemas and external standards (PEPPOL BIS/UBL 2.1, country-specific JSON/XML, CSV).
• Produce transformation specifications, validation rules, and exception logic.
• Define reference and master data synchronisation requirements.
• Partner with architects/engineers to design integrations with robust error handling, retries, idempotency, correlation IDs, monitoring, and alerting.
• Translate jurisdictional mandates into implementable requirements (formats, protocols, signatures, QR codes, archiving, clearance vs post-audit).

• Coordinate pilots, phased deployments, cutover, regression analysis, and hypercare.
• Produce compliance documentation with Finance, Tax/VAT, and Risk & Compliance.
• Define test strategy, test cases, and acceptance criteria across functional, integration, negative/error, performance, and control testing.
• Prepare sample payloads (JSON, XML/UBL), mocks, and validation checks.
• Lead UAT with Finance/AP/AR and local office teams; manage defects to closure.

£75k-£85k + benefits. 12 months FTC. City of London. 40% remote.

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