S/4HANA Greenfield vs. Brownfield: who you need when
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Morten Laufer
Founder
Greenfield rebuilds the SAP landscape and requires process and design expertise; Brownfield converts the existing system and requires migration, custom code, and testing experience. The choice determines the profile you are looking for — the same job advertisement does not fit both approaches. Nova Search is a founder-led tech recruitment consultancy with SAP as its flagship niche, sourcing candidates for both project types.
According to an ASUG study (2025), 59 per cent of companies already use SAP S/4HANA or are in the process of migrating.
Greenfield requires expertise in process redesign, while Brownfield demands SAP skills in data migration and cutover.
39 per cent of companies opt for a Brownfield upgrade, 27 per cent for Bluefield, and 26 per cent for Greenfield.
Nova Search fills both Greenfield and Brownfield project roles — shortlist in 5 business days, freelance profiles in 48 hours.
AI This article was created with the help of AI.
What is the difference between Brownfield and Greenfield?
Migration to SAP S/4HANA is one of the key IT decisions of the coming years. When modernising your ERP landscape, you face a fundamental question: do you make a radical break or do you focus on continuity? Generally speaking, companies have a choice between two classic migration paths and a hybrid middle way. The Greenfield approach refers to a complete new implementation of the SAP system on a greenfield site. Existing processes, legacy systems and custom developments are discarded. Instead, you systematically align the ERP system with the new SAP Best Practices and the Clean Core philosophy.
In contrast, there is the Brownfield approach, also known as System Conversion. With this method, you convert the existing SAP ECC landscape directly to S/4HANA. The goal is to retain established business processes, historical transactional data and proven customisations. This reduces change for the business departments, but potentially carries forward technical debt.
Criterion | Greenfield (New Implementation) | Brownfield (System Conversion) | Bluefield (Selective Data Transition) |
|---|---|---|---|
Objective | Process Standardisation & Clean Core | Fast technical conversion | Selective process & data optimisation |
Data Migration | Master data & open items only | Full history & customising | Selected historical data & processes |
Risk Profile | Higher change effort in business units | Higher technical complexity during cutover | Balanced, requires specialist tools |
Process Flexibility | Maximum scope for redesign | Low, oriented towards existing system | High for defined core areas |
Current market data illustrates the actual distribution: according to a meta-study by SNP, which combines surveys from Foundry, PAC, ASUG, DSAG and others, 39 per cent of companies opt for a system conversion (Brownfield), 27 per cent for the hybrid Bluefield approach and 26 per cent for a new implementation (Greenfield). Mixed and hybrid scenarios such as Selective Data Transition are therefore becoming increasingly important, especially for complex corporate structures. Which path is the right one depends on your strategic goals and the experience of your SAP-Projektmanager.
What is the difference between FI and CO?
The finance modules are at the heart of any S/4HANA transformation, as financial data runs through all operational business processes. In the classic SAP ECC world, Financial Accounting (FI) and Controlling (CO) were two separate worlds with their own data models, reconciliation accounts and table structures.
Financial Accounting (FI) vs. Controlling (CO)
The FI module is used for external accounting. It records all financial business transactions for external stakeholders such as tax offices, banks and auditors. This is where the balance sheet and profit and loss statement (P&L) are generated in accordance with HGB or IFRS. The CO module, on the other hand, is geared towards internal accounting. It supports management and department heads in operational corporate control, cost element and cost centre accounting, as well as contribution margin accounting.
FI (Financial Accounting): Focus on external reporting, statutory accounting, general ledger, accounts receivable, accounts payable and asset accounting.
CO (Controlling): Focus on internal reporting, cost centres, internal orders, product cost controlling and profitability analysis.
S/4HANA Universal Journal: Merging of all FI and CO documents in the central ACDOCA table as a Single Source of Truth.
With the introduction of SAP S/4HANA, SAP has eliminated this division technologically: through the Universal Journal (ACDOCA table), financial accounting and controlling flow into a shared database, which SAP itself describes as a Single Source of Truth for external and internal accounting. This eliminates time-consuming reconciliation work between FI and CO. For companies, however, this means that they need consultants who can think across processes and no longer isolate themselves to a single module. Given the complex accounting standards, experienced specialists are in demand, and the SAP Consultant Gehalt in the DACH market also reflects this broad FICO expertise.
Which SAP expertise the approaches require
The choice between Greenfield, Brownfield or Bluefield largely determines which skill profile your project team needs. A fatal mistake in resource planning is to treat S/4HANA expertise as a universal term. Greenfield projects require completely different methodological and technical skills than a Brownfield conversion.
Profile requirements in methodological comparison
Greenfield requirement profile: Strong enterprise architects, business process engineers and Fiori/UI5 specialists for designing modern interfaces. Knowledge of the SAP Business Technology Platform (BTP) and the Clean Core principle is required.
Brownfield requirement profile: Deep technical knowledge of SAP Readiness Check, Custom Code Migration Worklist, ABAP/ABAP OO adjustments, cutover management and specialised data cleansing tools.
Bluefield requirement profile: Functional expertise for Selective Data Transition, transformation tools and complex migration mapping logic.
Market pressure on these niche skills is intensifying exponentially. Regular mainstream maintenance for SAP ECC ends on 31 December 2027. Although SAP offers extended maintenance until the end of 2030 for an additional fee, the acute shortage of available migration specialists makes waiting an incalculable business risk.
Filling S/4HANA roles: permanent employment or freelance
When planning an S/4HANA migration project, you face the challenge of securing your core team in the long term while remaining flexible to balance temporary project peaks. A pure permanent recruitment strategy is often too slow for tightly scheduled cutovers, while a pure freelance setup risks long-term in-house knowledge. The optimal solution lies in a balanced staffing strategy.
Staffing models in the S/4HANA project
Criterion | Permanent employment (Permanent Recruitment) | Freelancers & contract staffing |
|---|---|---|
Focus of use | Strategic core roles, in-house architecture, FICO leadership | Specific migration peaks, cutover, testing, ABAP adjustment |
Availability | Sustainable development of internal capacities | Targeted support for short-term bottlenecks |
Knowledge transfer | Permanent retention of process knowledge within the company | Targeted import of know-how for specialised tools |
We at Nova Search support you exactly at this intersection: whether you are looking for strategic in-house consultants for Festanstellung (Permanent Recruitment) or need short-term capacity via Freelancer & Vertragsbesetzungen. With our database of over 1,500 pre-qualified SAP profiles in the DACH region, we avoid time-consuming CV noise. Through our two-stage screening process consisting of a technical deep-dive and a culture interview, you will receive the first qualified profiles on your desk within 5 working days for permanent positions, and verified freelancer profiles within 48 hours. Furthermore, we carry the risk with our contractual 90-day guarantee, ensuring your project stays on track in terms of time and expertise.
Further reading
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FAQ
Which is better, greenfield or brownfield?
That depends on the initial situation. Greenfield is suitable for companies with highly outdated systems that want to standardise their processes. Brownfield is ideal if proven and complex in-house developments are to be retained in order to minimise the costs and risks of the migration.
What is the difference between Greenfield and Bluefield?
While Greenfield represents a complete rebuild of the system without legacy data, Bluefield is a hybrid approach. With Bluefield, the system is rebuilt, but selected historical data and specific process customisations are selectively migrated.
What is the difference between FI and CO?
SAP FI (Financial Accounting) is responsible for external accounting and the preparation of financial statements. SAP CO (Controlling) is used for internal cost and performance accounting. In S/4HANA, both modules grow closely together in the Universal Journal.
What is meant by brownfield?
Brownfield refers to a system conversion. In this approach, an existing SAP ECC system is gradually converted into an SAP S/4HANA system, preserving existing data, structures and configurations. Around 39 per cent of companies choose this path.
How quickly can an SAP S/4HANA role be filled?
With a specialised recruitment consultancy like Nova Search, you will receive an initial qualified shortlist for permanent positions within 5 working days. For urgent project peaks, vetted SAP freelancers can even be placed within 48 hours.
