Hire SAP ABAP Developers

Why custom ABAP ages worse than anything else in the estate

Custom ABAP is the part of an SAP estate that ages worst. Every enhancement written in the wrong place is a small tax paid at every upgrade, and by the time an organisation is planning an S/4HANA move the accumulated total is usually the single largest line in the estimate.

Configuration is versioned and understood by the product. Custom code is not: it is a promise the organisation made to itself, in a language the product does not read, about behaviour the product is free to change underneath it.

Where the code goes matters more than what it does

So the first question about an ABAP developer is not what they can build. It is where they put it. Modifying a standard object, copying a standard program and editing the copy, or reaching for an implicit enhancement because the BAdI was harder to find — each works on the day, and each is discovered years later by somebody else. The developers worth hiring know the extension points and can say why they chose the one they did.

A BAdI is a published contract, and SAP takes some responsibility for it across releases. An implicit enhancement is a hook into a line of standard code that nobody promised would still be there. Both compile. Only one of them is a design decision.

Why ABAP written like a scripting language fails on real volumes

The second question is about volume. ABAP written as though it were a scripting language — nested loops over internal tables, selects inside loops, logic that should have been a join — performs acceptably against four hundred rows in a sandbox and becomes a nightly batch that does not finish. On HANA the correct instinct is to push the work down: CDS views, AMDP where it earns its complexity, and aggregation in the database rather than in the application server.

Code pushdown is not a style preference on HANA. It is the difference between a report that returns while the user is still looking at the screen and one that is scheduled overnight because somebody gave up.

The interface case we interview on specifically

The third is interfaces, and it is the one most often got wrong. An inbound IDoc will arrive twice. A middleware retry, an operator reprocessing a failed batch, a timeout that was actually a successful post — all of them replay the same document. Code that assumes a message arrives once produces duplicate postings, and duplicate postings are found in a reconciliation rather than in a log. We interview specifically on that case.

The answer we look for names a business key, says where the check happens relative to the commit, and says what the sending system is told on the second attempt. An answer that stops at a uniqueness constraint on a Z table has solved half of it and left the caller retrying forever.

What custom code remediation before S/4HANA actually involves

Readiness analysis produces a list, and the list is always longer than expected and less useful than it looks. The tooling finds syntax that will no longer compile and objects affected by the simplification items. It does not find the enhancement that still compiles perfectly and now runs against a table that no longer holds what it used to.

The work that matters is triage against use. A significant share of custom objects in a mature estate have not been executed in years, and deleting them is cheaper than remediating them — but that has to be established from execution statistics rather than by asking, because asking produces the answer that everything is needed. What remains divides into code that must be rewritten, code that only needs adjusting, and code whose function is now standard and should be retired in favour of it.

When you do not need an ABAP developer

If the requirement can be met by configuration, an available standard report, or a Fiori app over an existing service, writing ABAP for it is a decision to maintain something forever in exchange for a week saved now. That is occasionally the right trade and it should be made deliberately.

Nor is this the right role for extraction and reporting work that belongs outside the system. If the objective is analytics over SAP data, an extraction into a warehouse is usually a better answer than another Z report competing with the operational load, and the skills involved are different ones.

Where ABAP capacity genuinely earns its place is extension close to the transaction — logic that must run inside the document posting, interfaces that must be transactionally consistent with it, and remediation of code the organisation already owns and cannot walk away from.