That and he’d seen Lorentz special relativity and changed it while adding maxwells equation and Poincaré work, e=mc2 isn’t even his but a rearranged/rephrased equation of maxwell and Laue.
UNVEILED SECRETS AND MESSAGES OF LIGHT; AFTER GRADUATING IN 1900, EINSTEIN SPENT ALMOST TWO FRUSTRATING YEARS SEARCHING FOR A TEACHING POST. HE ACQUIRED SWISS CITIZENSHIP IN FEBRUARY 1901, BUT WAS NOT CONSCRIPTED FOR MEDICAL REASONS. WITH THE HELP OF MARCEL GROSSMANN'S FATHER, HE SECURED A JOB IN BERN AT THE FEDERAL OFFICE FOR INTELLECTUAL PROPERTY, THE PATENT OFFICE,NAS AN ASSISTANT EXAMINER – LEVEL III.
EINSTEIN EVALUATED PATENT APPLICATIONS FOR A VARIETY OF DEVICES/INVENTIONS (THESE WHERE HIS KNOWLEDGE CAME FROM) INCLUDING A GRAVEL SORTER AND AN ELECTROMECHANICAL TYPEWRITER. IN 1903, HIS POSITION AT THE SWISS PATENT OFFICE BECAME PERMANENT, ALTHOUGH HE WAS PASSED OVER FOR PROMOTION UNTIL HE "FULLY MASTERED MACHINE TECHNOLOGY".
MUCH OF HIS WORK AT THE PATENT OFFICE RELATED TO QUESTIONS ABOUT TRANSMISSION OF ELECTRIC SIGNALS AND ELECTRICAL-MECHANICAL SYNCHRONIZATION OF TIME, TWO TECHNICAL PROBLEMS THAT SHOW UP CONSPICUOUSLY IN THE THOUGHT EXPERIMENTS THAT EVENTUALLY LED EINSTEIN TO HIS RADICAL CONCLUSIONS ABOUT THE NATURE OF LIGHT AND THE FUNDAMENTAL CONNECTION BETWEEN SPACE AND TIME. EINSTEIN WASN'T BORN GENIUS