Behind a packet of biscuits sits a long chain of business. The maker had to buy flour and sugar, receive them at the factory, plan the baking, pack the biscuits, ship them to distributors and send invoices. In a large manufacturer, SAP records every one of those steps. A purchase order in the buying module becomes a stock movement, a delivery, an invoice and an accounting entry in the other modules, without anyone typing it twice.
Two kinds of SAP engineer made that work. A functional consultant knew how purchasing runs at the company and configured the Materials Management module, the part of SAP that covers buying and stock, to match, with its suppliers, approval limits and price rules. A technical developer wrote code in ABAP, SAP's own programming language, where configuration was not enough, such as a report on flour stock across factories, and an IDoc interface, using SAP's own format for exchanging data with other systems, that sends orders to the distributor's own system. An IDoc is a standard electronic document, such as an ORDERS message that carries a purchase order, a DESADV message that announces a delivery on its way, or an INVOIC message that carries an invoice, so two companies' systems can trade them without anyone retyping the details. The warehouse staff scan pallets on a phone screen built with SAP Fiori, SAP's modern style of screens for browsers and phones, and a developer built that screen too.
The work involves customising SAP to how the company runs and keeping it running that way. That could mean a workshop with the finance team about how they close the month, setting up a new tax rule, writing a report or a screen in ABAP, or fixing an interface that stopped sending invoices. During a move to S/4HANA, a lot of time goes into checking old custom code and data so they survive the move. Consultants spend more of their day with business people, and developers spend more of it in code, but both need to understand how the modules hand work to each other.
Around the configuration and the code sits a set of duties that every SAP engineer shares.
Testing is careful and slow. A change to one module can ripple into others, so every change is tested in a separate system before it goes live, often with business users checking it themselves, and moved across through SAP's transport system with approvals at each step.
Support is a large part of many SAP jobs. When an invoice will not post or a stock count looks wrong, users raise a ticket, and the engineer finds the cause, often against a deadline such as the month-end close.
Documentation and training matter too. Engineers write down how each process is set up and why, and train the people who will use a new screen or report. SAP brings out updates and new versions on a regular schedule, so engineers keep learning, and many earn SAP's certifications along the way.
SAP, ServiceNow and Salesforce are all platforms that a company buys and shapes, but each covers a different part of the business. A
The ideal candidate is curious about how businesses actually run, how a factory buys its materials, how a finance team closes the month, how goods reach a shop. Much of the job faces the business rather than the code, so the ideal candidate enjoys sitting with users, understanding the problems in their daily work and turning them into a working setup. Such a person does not mind learning a large, complicated legacy system in depth, one that carries decades of a company's history. Commerce and engineering graduates both find a home here, one on the functional side and the other on the technical side. With time, a consultant can become a solution architect who designs how SAP covers a whole company, or a lead who runs a full S/4HANA move.