Freelance Backend Developer / Integration Specialist – SAP S/4HANA Cloud (m/f/d)

About the Position

We are looking for an experienced Backend Developer and SAP Integration Specialist to connect our Έξυπνη Πλατφόρμα Ακεραιότητας (SIP) with our clients’ SAP S/4HANA Cloud systems.

The goal of this project is to build a robust, bidirectional interface. This integration will extract vendor master data, product/material catalogs, purchasing info records, and supplier balance sheets while enabling our system to write back approval/rejection statuses and TRACES EUDR Due Diligence Statement (DDS) verification numbers into SAP.

Responsibilities

• API Architecture & Integration: Design and implement OData (v2/v4) and REST API integrations between our platform and SAP S/4HANA Cloud.
• SAP Configuration Setup: Configure SAP Communication Scenarios, Communication Systems, and Users (e.g., SAP_COM_0008, SAP_COM_0009, SAP_COM_0002).
• Bidirectional Data Flow:
  • Implement incremental delta loads (filtering via LastChangeDateTime and Delta Tokens) for business partners, products, and balances.
  • Develop write-back mechanisms (PATCH/POST using CSRF token handling) to update status fields and Custom Fields (YY1_).
• Security & Resilience: Set up OAuth 2.0 / Basic Authentication, robust error handling, exponential backoff retries, and server-side pagination ($skiptoken).
• Documentation & Testing: Maintain clear API integration documentation and assist in onboarding client SAP environments.

Requirements

• Proven Experience: Track record in backend development with hands-on experience integrating SAP S/4HANA Cloud (Public/Private Edition) via the SAP Business Accelerator Hub.
• SAP API Expertise: Deep knowledge of standard SAP OData services, specifically:
  • API_BUSINESS_PARTNER
  • API_PRODUCT_SRV
  • API_SUPPLIERBALANCE_SRV
  • API_PURCHASING_INFORECORD
• Modern Tech Stack: Proficiency in backend technologies (e.g., Node.js/TypeScript, Python, Java, Go, or .NET/C#) and REST/OData protocols.
• Business Domain Knowledge: Solid understanding of SAP master data structures (Suppliers/Business Partners, Materials/PIRs) and basic Accounts Payable processes.
• Autonomy: Ability to work independently, troubleshoot integration hurdles, and liaise with client-side SAP administrators.
• Languages: Professional fluency in English (German is a plus).

We Offer

• 100% Remote Work: Full flexibility to work from anywhere.
• Streamlined Scope: Clear deliverables with direct communication and no unnecessary corporate bureaucracy.
• Fair Compensation: Transparent hourly/daily billing based on actual time and effort.
• Future Project Potential: Opportunity for ongoing follow-up projects as we scale and onboard additional client systems.

About the Company

Smart Integrity Platform is dedicated to enhancing global compliance with the UN.

• Contact: +49 40 2263 92510
• Website: Smart Integrity Platform
• Solutions: Platform Overview, Compliance Gateway

How to Apply

Please submit your Resume / Project List, your hourly rate (in EUR, ex. VAT), and your earliest availability to: Αίτηση.