zapewniajcej
Zapewniajcej appears to be a nonstandard spelling of a Polish present active participle derived from the verb zapewniać (to provide, guarantee, secure). The standard forms are zapewniający (masculine singular), zapewniająca (feminine singular), and zapewniające (neuter singular), with the feminine genitive singular being zapewniającej. The term zapewniajcej itself is not recognized as correct in standard Polish orthography.
In Polish, present active participles function as adjectives and must agree with the noun they modify in
Usage notes: The correct forms are used in attributive position before a noun or in relative clauses.
See also: Polish participles, verb zapewniać, Polish adjectives and agreement, relative clauses in Polish.