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

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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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Location:
City Of London
Salary:
£85,000
Job Type:
FullTime
Category:
IT;Finance

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