There are a few in­escapable truths that we want to high­light im­me­di­ately.

• As soon as some­thing is writ­ten it be­comes legacy.
• Garbage in, garbage out.
• Knowledge is al­ways miss­ing.
• Any mi­gra­tion pro­ject car­ries risks

It’s im­por­tant to note that if you’re un­der­tak­ing a mod­erni­sa­tion pro­ject and are bas­ing it solely off the ex­ist­ing legacy sys­tem, it will only be as good as the legacy sys­tem. This is the rule garbage in, garbage out. While the tech­nol­ogy needs to be mod­ernised, so too will the cus­tom func­tion­al­ity.

One of the core rea­sons an ap­pli­ca­tion be­comes legacy is be­cause of a lack of knowl­edge. The most com­mon story we’ve heard is that some­thing is­n’t doc­u­mented and a key em­ployee leaves the or­gan­i­sa­tion re­sult­ing in a huge knowl­edge gap. Let’s keep this in mind and avoid mak­ing the same mis­take.

For larger sys­tems that have been built be­spoke, they may be so large that they can’t be mi­grated in a sin­gle pro­ject. As a re­sult, we must di­vide and con­quer

The steps are sim­i­lar to those de­scribed above but for a few ad­di­tions.

Step 6: Using the Codebots tech­nol­ogy, model and cre­ate a worker bot.

Step 7: Add an in­ter­cep­tor be­tween the old ap­pli­ca­tion and its data­base to for­ward all re­quests to the worker bot.

Step 8: If pos­si­ble, add an ob­server to the legacy ap­pli­ca­tion that is able to for­ward other re­quest data to the worker bot.

Step 9: Use an iso­la­tion checker or anti-cor­rup­tion layer to en­sure the data in­tegrity of the new ap­pli­ca­tion. It’s pos­si­ble that some re­quire­ments have been missed and its im­por­tant to do a delta be­tween the data­bases and make sure it’s what you ex­pect.

We un­der­stand that it may be un­rea­son­able to have your in­ter­nal team con­duct legacy mod­erni­sa­tion pro­jects of this size with­out im­pact­ing busi­ness op­er­a­tions. WorkingMouse acts as a skilled legacy mi­gra­tion provider to help de­liver on strate­gic ob­jec­tives with­out com­pro­mis­ing day to day op­er­a­tions.