If you want your ships to level above 100, you'll want to add a Level Experience Ramp Override to your Game.ini file. In single player it's located at /Steam/steamapps/common/ATLAS/ShooterGame/Saved/Config/WindowsNoEditor

What is a Level Experience Ramp Override? They set the amount of experience needed to reach each level for players, tames, NPC, and ships.

There are four different ones for Atlas, as shown in the order below:

[1] Player

[2] Tame

[3] NPC

[4] Ship

When adding your overrides to your Game.ini file, you must put them in the correct order. If you only want to modify some, but not all of them you must leave a blank override entry in it's place.

Below is an example of a ship level experience ramp override that allows up to level 150, and leaves the player/tame/npc ramps vanilla. Please note, that the experience needed for each level is the TOTAL amount (from level 1 to the specified level) and not just the amount needed from the previous level. Also, the number in brackets is not the actual level, add 2 to get the actual level (example: [148] is actually the amount needed to get to level 150). Feel free to use this entry or modify for your own personal needs.

LevelExperienceRampOverrides=()
LevelExperienceRampOverrides=()
LevelExperienceRampOverrides=()
LevelExperienceRampOverrides=(ExperiencePointsForLevel[0]=100,ExperiencePointsForLevel[1]=218,ExperiencePointsForLevel[2]=354,ExperiencePointsForLevel[3]=508,ExperiencePointsForLevel[4]=680,ExperiencePointsForLevel[5]=870,ExperiencePointsForLevel[6]=1078,ExperiencePointsForLevel[7]=1304,ExperiencePointsForLevel[8]=1548,ExperiencePointsForLevel[9]=1810,ExperiencePointsForLevel[10]=2090,ExperiencePointsForLevel[11]=2388,ExperiencePointsForLevel[12]=2704,ExperiencePointsForLevel[13]=3038,ExperiencePointsForLevel[14]=3390,ExperiencePointsForLevel[15]=3760,ExperiencePointsForLevel[16]=4148,ExperiencePointsForLevel[17]=4554,ExperiencePointsForLevel[18]=4978,ExperiencePointsForLevel[19]=5420,ExperiencePointsForLevel[20]=5880,ExperiencePointsForLevel[21]=6358,ExperiencePointsForLevel[22]=6854,ExperiencePointsForLevel[23]=7406,ExperiencePointsForLevel[24]=8100,ExperiencePointsForLevel[25]=8944,ExperiencePointsForLevel[26]=9963,ExperiencePointsForLevel[27]=11188,ExperiencePointsForLevel[28]=12652,ExperiencePointsForLevel[29]=14393,ExperiencePointsForLevel[30]=16452,ExperiencePointsForLevel[31]=18876,ExperiencePointsForLevel[32]=21715,ExperiencePointsForLevel[33]=25027,ExperiencePointsForLevel[34]=28872,ExperiencePointsForLevel[35]=33318,ExperiencePointsForLevel[36]=38439,ExperiencePointsForLevel[37]=44317,ExperiencePointsForLevel[38]=51038,ExperiencePointsForLevel[39]=58697,ExperiencePointsForLevel[40]=67397,ExperiencePointsForLevel[41]=77250,ExperiencePointsForLevel[42]=87556,ExperiencePointsForLevel[43]=98315,ExperiencePointsForLevel[44]=109527,ExperiencePointsForLevel[45]=121192,ExperiencePointsForLevel[46]=133310,ExperiencePointsForLevel[47]=145881,ExperiencePointsForLevel[48]=158905,ExperiencePointsForLevel[49]=172382,ExperiencePointsForLevel[50]=186312,ExperiencePointsForLevel[51]=200695,ExperiencePointsForLevel[52]=215531,ExperiencePointsForLevel[53]=230820,ExperiencePointsForLevel[54]=246562,ExperiencePointsForLevel[55]=262757,ExperiencePointsForLevel[56]=279405,ExperiencePointsForLevel[57]=296506,ExperiencePointsForLevel[58]=314060,ExperiencePointsForLevel[59]=332067,ExperiencePointsForLevel[60]=364776,ExperiencePointsForLevel[61]=400706,ExperiencePointsForLevel[62]=440176,ExperiencePointsForLevel[63]=483533,ExperiencePointsForLevel[64]=531161,ExperiencePointsForLevel[65]=583480,ExperiencePointsForLevel[66]=640953,ExperiencePointsForLevel[67]=704087,ExperiencePointsForLevel[68]=773439,ExperiencePointsForLevel[69]=849623,ExperiencePointsForLevel[70]=933311,ExperiencePointsForLevel[71]=1025242,ExperiencePointsForLevel[72]=1126229,ExperiencePointsForLevel[73]=1237162,ExperiencePointsForLevel[74]=1359022,ExperiencePointsForLevel[75]=1492886,ExperiencePointsForLevel[76]=1639935,ExperiencePointsForLevel[77]=1801469,ExperiencePointsForLevel[78]=1978914,ExperiencePointsForLevel[79]=2173837,ExperiencePointsForLevel[80]=2387960,ExperiencePointsForLevel[81]=2623174,ExperiencePointsForLevel[82]=2881556,ExperiencePointsForLevel[83]=3165390,ExperiencePointsForLevel[84]=3477181,ExperiencePointsForLevel[85]=3819683,ExperiencePointsForLevel[86]=4195922,ExperiencePointsForLevel[87]=4609220,ExperiencePointsForLevel[88]=5063228,ExperiencePointsForLevel[89]=5561956,ExperiencePointsForLevel[90]=6109809,ExperiencePointsForLevel[91]=6711625,ExperiencePointsForLevel[92]=7372720,ExperiencePointsForLevel[93]=8098933,ExperiencePointsForLevel[94]=8896678,ExperiencePointsForLevel[95]=9773001,ExperiencePointsForLevel[96]=10735641,ExperiencePointsForLevel[97]=11793102,ExperiencePointsForLevel[98]=12954722,ExperiencePointsForLevel[99]=14123645,ExperiencePointsForLevel[100]=14391994,ExperiencePointsForLevel[101]=14665442,ExperiencePointsForLevel[102]=14944086,ExperiencePointsForLevel[103]=15228023,ExperiencePointsForLevel[104]=15517356,ExperiencePointsForLevel[105]=15812185,ExperiencePointsForLevel[106]=16112617,ExperiencePointsForLevel[107]=16418757,ExperiencePointsForLevel[108]=16730713,ExperiencePointsForLevel[109]=17048597,ExperiencePointsForLevel[110]=17372520,ExperiencePointsForLevel[111]=17702598,ExperiencePointsForLevel[112]=18038947,ExperiencePointsForLevel[113]=18381687,ExperiencePointsForLevel[114]=18730939,ExperiencePointsForLevel[115]=19086827,ExperiencePointsForLevel[116]=19449477,ExperiencePointsForLevel[117]=19819017,ExperiencePointsForLevel[118]=20195578,ExperiencePointsForLevel[119]=20579294,ExperiencePointsForLevel[120]=20966185,ExperiencePointsForLevel[121]=21360349,ExperiencePointsForLevel[122]=21761924,ExperiencePointsForLevel[123]=22171048,ExperiencePointsForLevel[124]=22587863,ExperiencePointsForLevel[125]=23012515,ExperiencePointsForLevel[126]=23445151,ExperiencePointsForLevel[127]=23885919,ExperiencePointsForLevel[128]=24334975,ExperiencePointsForLevel[129]=24792472,ExperiencePointsForLevel[130]=25258571,ExperiencePointsForLevel[131]=25733432,ExperiencePointsForLevel[132]=26217220,ExperiencePointsForLevel[133]=26710104,ExperiencePointsForLevel[134]=27212254,ExperiencePointsForLevel[135]=27723844,ExperiencePointsForLevel[136]=28245053,ExperiencePointsForLevel[137]=28776060,ExperiencePointsForLevel[138]=29317050,ExperiencePointsForLevel[139]=29868210,ExperiencePointsForLevel[140]=30429733,ExperiencePointsForLevel[141]=31001812,ExperiencePointsForLevel[142]=31584646,ExperiencePointsForLevel[143]=32178437,ExperiencePointsForLevel[144]=32783392,ExperiencePointsForLevel[145]=33399719,ExperiencePointsForLevel[146]=34027634,ExperiencePointsForLevel[147]=34667354,ExperiencePointsForLevel[148]=35034176)