Date: 202012
Local time of day: 0601-1200
Location: ZZZ.ARTCC, US
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Not Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness; Training / Qualification; Human-Machine Interface; Distraction; Confusion; Communication Breakdown
Second reporter function: First Officer; Pilot Flying
Anomaly: Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Result: Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
Contributing factors: Human Factors; Environment - Non Weather Related; Airspace Structure
Primary problem: Human Factors

Narrative: I take full responsibility for this altitude deviation.  We were in the chocks at ZZZ and there was a slight reroute to ZZZZ.  The FO X said it would not load in the FMC; but FO loaded manually.  FO said the same thing happened on the last flight also into ZZZZ.   I had flown down to ZZZ1 in Month X and had the same reroute.   The FO had over 40 hours total time with XX landings.  I have not flown in over 60 days.  So in the chocks the Departure Briefing I briefed CA designates PF PM states concerns and threats PF states concerns and threats taxi; takeoff/reject departure.  The FO said low time and I said my over 60 days off.  FO is rock solid; what an excellent stick.  You know when you meet someone for the first time; it's going to be a fun flight.  Every time I see FO X's name on the crew list; it will be a fun flight.  For over 40 hours and XX landings FO flew real well.  Talking to ZZZ Center of frequencies XYZ.Z and XYA.B and we're climbing to FL230 and they ask Aircraft X we just want to confirm the route.  FO asks this is a reroute you want me to put on the autopilot?  If I had said yes; I would not be writing the report.  The fault is all mine.  My thinking was this is the same reroute we got in the chocks easy-peasy.  And it was the same route but took three or four minutes to get everything done. ZZZ Center then cleared us ZZZZZ JXXX ZZZ1 as filed.  I spelt ZZZZZ wrong and it was not accepted in the FMC.  Right then the Altitude Deviation warning came on.  ZZZ Center told us switch over to XYZ.Z and I reported FL240 we were at FL238 and our clearance was FL230.  Center than cleared me to climb to FL400.Lots of areas to hit on.  Even though I haven't flown in over 60 days do Company work on most days; I read all the changes; FD Pro X; Airline Pilots; WSI Pilotbrief; and Outlook.  On any day to read all this it takes 45 minutes to and hour and a half.  For this ZZZZ flight; I checked it three days in a row.  What was the routing; did it go over ZZZZ1 Country; and the weather?  FO is an excellent pilot.  Low time like FO is the autopilot should have been on.  The mistake is on me; no excuse; I messed up.It pains me to have made this mistake; I can't remember my last report.


Second narrative: New on the aircraft; I had briefed the Captain I wanted to hand fly the aircraft; which he agreed was a good idea. We departed ZZZ on XXL and was cleared on the ZZZZZ1 4 RNAV SID.  In our turn towards ZZZZZ1 we received clearance to ZZZZZ2 on frequency XYA.B. When we checked in to XYZ.Z we received a clearance to FL230 and to fly direct to ZZZZZ. ZZZZZ is not on the SID or depicted anywhere on the SID. The Captain was unfamiliar but I was because I flew the same Flight the day before and we received the same clearance. I believe I spelt the fix out to the Captain and asked if I should I put the Autopilot on; which he responded 'no it's okay'. Just as he was typing it in and he executed it we heard the altitude alert caution and we were at 23;580 feet. I quickly reacted and proceeded back towards FL230 at the same time the Captain called ATC and stated 'Aircraft X at FL240'. ATC then cleared us to FL310 or FL330. The deviation occurred at XA:22Z.I should not have asked the Captain if I should put the autopilot on; I should have just done it. We were obviously both needed to navigate. I should have put the autopilot on while the Captain was trying to figure out and insert a fix that was not on the SID. Having the autopilot on would have prevented us from flying through our assigned altitude while we were navigating the new clearance.


Synopsis: Air carrier flight crew reported an altitude excursion during climbout.