SAP ECC / S/4HANA RAP Techno functional Developer

Job Title: SAP ECC / S/4HANA RAP Techno functional Developer
Location: Washington, DC

Duration: 12 Months – Long Term

Hybrid Onsite: 4 days per week from Day 1, with a full transition to 100% onsite anticipated soon.

Background:

Client is undergoing a multi-year, multi-stage transformation from SAP ECC on-premises to SAP S/4HANA on-premises. The program involves a large volume of custom ABAP code built to support specialized business processes. In Stage 1, this code must be adapted for compatibility with S/4HANA’s simplified data structures and programming model. In Stage 2, it will be re-engineered using clean-core principles and cloud-ready ABAP (strict ABAP) within S/4HANA—leveraging frameworks such as RAP, CDS, and AMDP. In Stage 3, selected components may shift to SAP BTP using side-by-side extensibility where it provides architectural or scalability benefits.

This is a techno-functional role that requires strong hands-on development capabilities combined with deep process understanding. The selected candidate will be expected to interpret functional requirements, participate in fit-gap assessments, and independently deliver scalable, upgrade-safe solutions that align with SAP’s architectural direction.

The role demands end-to-end accountability—from technical design and performance optimization to security adaptation and clean extensibility. Candidates must be confident problem-solvers, effective collaborators across business and IT teams, and able to demonstrate their capabilities through a hands-on coding assessment during the evaluation process.

Minimum Requirements:        

Candidates must meet all the below criteria. Do not submit resumes that do not meet the below criteria.    

•           15+ years of SAP ABAP development in ECC

•           7+ years of S/4HANA development experience

•           Cloud ready application development in S/4HANA

•           RAP application delivery in S/4HANA or SAP BTP ABAP

•           Code remediation, simplification, and HANA optimization expertise

Core S/4HANA Technical Responsibilities:

•           Analyze and remediate legacy custom code to align with S/4HANA simplifications, strict ABAP standards, and clean core principles

•           Reengineer existing ABAP programs for performance optimization on HANA using CDS, AMDP, and SQL tuning

•           Design and develop RAP-based services for transactional applications with upgrade-safe, extensible architecture

•           Build and expose OData services (V2/V4) to support Fiori apps and external system integration

•           Document functional and technical specifications with clarity, precision, and traceability

•           Walk through designs and specifications with stakeholders, incorporating feedback and gaining buy-in

•           Design end-to-end technical solutions based on functional requirements and simplification impacts

•           Develop and execute unit tests to validate logic and ensure readiness for integration testing

•           Migrate and adapt custom logic to the new S/4HANA data model (e.g., ACDOCA, MATDOC, BP)

•           Replace legacy BDCs and screen logic with modern BAPIs and OData APIs

•           Participate in fit-gap workshops, advising on standard vs. extensible approaches

•           Implement extensibility using Key User, On-Stack, or Side-by-Side models, based on solution context

•           Ensure compliance with security standards, including DCL-based and RAP-based authorization

•           Maintain code lifecycle discipline using Git, ATC checks, clean ABAP, and peer reviews

•           Bridge business and technical teams, providing insight into how design choices affect process outcomes

Problem-Solving & Adaptation Responsibilities for ECC → S/4HANA Conversion

•           Diagnose simplification impacts by tracing SUM, ATC, syntax, and data-model errors back to the exact custom object or dependency.

•           Resolve inconsistencies between ECC logic and S/4HANA requirements by adapting code to new frameworks (CDS reads, MATDOC, ACDOCA, BP, etc.).

•           Analyze custom objects (reports, forms, interfaces, workflows, enhancements) to determine what to delete, redesign, or reimplement using S/4HANA standard features.

•           Triangulate issues across ECC, S/4, and multiple conversion cycles by comparing runtime behavior and identifying differences introduced by simplification.

•           Perform root-cause analysis on conversion failures (missing config, mapping errors, deprecated functions, unsupported objects, broken SELECTs).

•           Adapt legacy enhancements to modern extension models (RAP behaviors, CDS-based logic, BTP extensions).

•           Collaborate with functional teams to interpret functional impacts and turn them into technical remediation tasks.

•           Rebuild logic broken by HANA constraints such as implicit sorting, non-deterministic behavior, and nested SELECT loops.

•           Design S/4HANA-compliant data access strategies (CDS, virtual data models, released APIs) for performance and upgrade safety.

•           Validate converted objects across all cycles, ensuring fixes hold and regressions don’t appear in later SUM runs.

•           Plan and execute adaptation waves so changes remain traceable, testable, and aligned with clean-core strategy.

•           Realign interfaces broken by data-model changes, deprecated IDOCs, or API shifts in S/4HANA.

•           Provide fast, tactical problem-solving to unblock defects caused by conversion anomalies or data inconsistencies.

Required Technical Skills (Must Be Proven in Projects):       

Legacy Code Remediation for Simplification, Fit Gaps, Modern SAP Standards:

Adapt custom code for:          

•           Functional differences from ECC to S/4HANA    

•           SAP Simplification List impacts and fit-gap handling       

•           HANA DB optimization (joins, buffering, indexing)           

Re-engineer custom logic to: 

•           Strict ABAP (Cloud-compliant)   

•           Modular OO ABAP patterns      

•           CDS Views and AMDPs

Replace legacy constructs with modern SAP standards:       

•           BDC replaced by BAPIs or OData services        

•           Modifications converted to enhancement or extensibility frameworks           

•           ECC clones replaced with standard or clean reimplementations  

•           Focus on standard SAP approaches before considering custom solutions          

Advanced Development Capabilities  

•           Build complex CDS Views with full annotation layers (UI, analytical, consumption, object model)      

•           Develop AMDPs for performance-critical logic    

•           Advanced SQL development tuned for HANA     

•           Strong object-oriented ABAP including factory methods, interfaces, and exception handling 

RAP (ABAP RESTful Application Programming Model)         

Develop RAP-based services and applications including:

•           Behavior definitions      

•           Validations, determinations, feature/action logic 

•           Draft handling   

•           Build and deploy RAP in S/4HANA or SAP BTP ABAP Environment           

•           Create upgrade-safe APIs and transactional services aligned with clean core        

Extensibility & Cloud-Ready Development:    

Implement:     

•           Key User Extensibility (In-App)  

•           On-Stack Developer Extensibility           

•           Side-by-Side Extensibility using BTP     

•           Migrate legacy customizations to extensibility models     

•           Create cloud-ready APIs and services   

Integration & OData Services 

Design and implement:          

•           OData V2 (SEGW) services      

•           OData V4 (RAP) services         

•           Use RAP modelling services for integration with portals, external systems, and Fiori apps

•           Replace legacy file or screen-based interfaces with clean service-based models  

•           Use Smart Data Access (SDA) for external DB access   

Security Adaptation:   

Implement modern authorization via: 

•           CDS DCL(Data Control Language)        

•           RAP security model      

•           Align new code with role-based access control and secure design principles         

Development Practices & Tooling:

•           Git/GitHub for ABAP version control      

•           Strong debugging (standard and custom objects)           

•           Clean ABAP, ATC compliance, unit testing, peer reviews

Functional knowledge in at least one of: FI/CO, FM, MM, SD, PS, GM, Travel, AA, Investment Management(IM)        

Ability to:        

•           Read and interpret functional specifications        

•           Translate process logic into clean technical design         

•           Participate in design workshops and propose standard-aligned solutions          

•           Conduct fit-gap analysis with functional/business teams 

•           Perform end-to-end impact analysis across process, data, and code           

S/4HANA Data Model Adaptation (Mandatory) :

•           Demonstrated experience adapting custom development to S/4HANA’s changed data model, including:        

•           Compatibility views (VBRK, BKPF, FMBDT, PSGLFLEXA etc.)   

•           Universal Journal (ACDOCA)    

•           Inventory and material documents (MATDOC)   

•           Business Partner model replacing Customer/Vendor      

•           Refactored custom code and reports to work with CDS-based logic and new table structures           

•           Parallel ledgers and extension ledgers   

•           Adapt Validation, Substitution, FM Derivations and GM Derivations to business requirements          

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