AN A320 CREW; DEPARTING DEN; OVERSHOT THEIR ASSIGNED ALT.

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FOR ME; THUS WAS THE THIRD LEG; ON THE THIRD DAY OF A 4-DAY TRIP. IT WAS THE CAPT'S FIRST FLT OF THE DAY; AND THE FIRST TIME WE HAD FLOWN TOGETHER. ON MY TRIP; THIS WAS THE THIRD CAPT I HAD FLOWN WITH IN 3 DAYS. WX AT BOTH DENVER AND GUNNISON WAS VFR; ALTHOUGH IT WAS NIGHT. ON DEP; THE CAPT WAS THE PF. WE WERE CLRED TO 10000 FT MSL; STANDARD FOR DEPS OUT OF DENVER. PASSING 9000 FT; I CALLED OUT 1000 FT TO LEVEL AND THE CAPT RESPONDED; STANDARD SOP AT OUR ACR. SINCE HE HAD A VVI OF APPROX 2000 FPM AT 9500 FT; I CALLED OUT APCHING 10000 FT; WITH NO RESPONSE. AT 9800 FT HE WAS STILL CLBING AT PRETTY MUCH THE SAME RATE; SO I CALLED OUT APCHING 10000 FT. SINCE THE AUTOTHROTTLES WERE ENGAGED AND THE FLT DIRECTOR HAD CAPTURED 10000 FT; WHICH WAS BRINGING THE THRUST BACK TO HOLD 250 KTS; I WAS NOT OVERLY CONCERNED. AT 10000 FT AND WITH STILL A SUBSTANTIAL VVI; I CALLED OUT AGAIN TO LEVEL AT 10000 FT -- THIS TIME THE CAPT RESPONDED; BUT WITH THE VVI AND A SLOW RESPONSE; HE WENT TO 10300 FT BEFORE CORRECTING TO 10000 FT. THE TOTAL DEV MIGHT HAVE BEEN 15 SECONDS; AND NO TCASII WARNINGS WERE GENERATED. DEN DEP HAD CLRED US DIRECT TO THE POINT BAYLR; HOWEVER; DURING THE DEV; THEY TURNED US R 40 DEGS; BUT NEVER MENTIONED THE ALT. SHORTLY AFTERWARD; WE WERE CLRED TO FL230 AND PASSED TO ZDV. THE REST OF THE FLT WAS UNEVENTFUL. SINCE THIS WAS MY FIRST FLT WITH THIS CAPT; AND THIRD CAPT IN 3 DAYS; I FEEL OUR UNFAMILIARITY PLAYED A PART IN THIS INCIDENT. I FIGURED MY CALLOUTS AND WARNINGS WERE SUFFICIENT; SINCE THEY USUALLY ARE WITH OTHER PLTS. HOWEVER; THIS WAS A SHORT; CHALLENGING FLT TO AN UNCTLED; MOUNTAIN ARPT AT NIGHT. THIS CAPT WAS ZEROED IN ON THAT AND WAS WORKING WITH ME FOR THE FIRST TIME. I SHOULD HAVE SIMPLY TAKEN THE AIRPLANE AND DISCUSSED IT LATER. SINCE I REALLY DIDN'T KNOW THIS INDIVIDUAL WELL (WE JUST MET 40 MINS EARLIER); I REALLY DIDN'T KNOW WHAT HIS THOUGHTS WERE ON THAT TYPE OF ACTION. HE SAID LATER HE WISHED I HAD DONE THAT. I LEARNED A LOT FROM THIS SHORT FLT.