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(Email Screening Question) A monitoring script, written in Ruby (MRI 2.1.7) and running in a server with Ubuntu 12.04 64bit, with kernel 3.2, periodically checks for the disk I/O of running processes using this snippet of code: def disk_stats(pid) proc_io =File.read("/proc/#{pid}/io") io =YAML.load(proc_io) [ io["read_bytes"], io["write_bytes"] - io["cancelled_write_bytes"] ] end The following exception, however, is sporadically raised from inside the method when trying to acquire the stats: Psych::SyntaxError: (<unknown>): could not find expected ':' while scanning a simple key at line 8 column 1 What do you think is going on here? Is the bug in our disk_stats function, in the YAML parser or in the kernel?
avatar

Git Infrastructure Engineer

Interviewed at GitHub

3.6
Apr 5, 2017

(Email Screening Question) A monitoring script, written in Ruby (MRI 2.1.7) and running in a server with Ubuntu 12.04 64bit, with kernel 3.2, periodically checks for the disk I/O of running processes using this snippet of code: def disk_stats(pid) proc_io =File.read("/proc/#{pid}/io") io =YAML.load(proc_io) [ io["read_bytes"], io["write_bytes"] - io["cancelled_write_bytes"] ] end The following exception, however, is sporadically raised from inside the method when trying to acquire the stats: Psych::SyntaxError: (<unknown>): could not find expected ':' while scanning a simple key at line 8 column 1 What do you think is going on here? Is the bug in our disk_stats function, in the YAML parser or in the kernel?

(Email Screening Question) The following areas map to technologies we use on a regular basis at GitHub. Experience in all of these areas is not a prerequisite for working here. We'd like to know how many of these overlap with your skill set so that we can tailor our interview questions if we move forward in the process. Please assess your experience in the following areas on a 1-5 scale, where (1) is "no knowledge or experience" and (5) is "extensive professional experience". If you're not sure, feel free to leave it blank. Just place the number next to the corresponding areas listed here: • coding o comp-sci fundamentals (data structures, big-O notation) o C or C++ programming o Go programming o git usage o git internals o shell scripting o ruby programming • troubleshooting o debuggers (gdb, lldb) o profilers (perf, oprofile, perftools, strace) o network flow (tcpdump, pcap) • large system design o unix processes and threads o sockets o signals o mysql o redis o distributed systems • operational experience o reading and debugging code you’ve never seen before o helping other engineers understand and navigate production systems o handling large scale production incidents (external communications, internal coordination)
avatar

Git Infrastructure Engineer

Interviewed at GitHub

3.6
Apr 5, 2017

(Email Screening Question) The following areas map to technologies we use on a regular basis at GitHub. Experience in all of these areas is not a prerequisite for working here. We'd like to know how many of these overlap with your skill set so that we can tailor our interview questions if we move forward in the process. Please assess your experience in the following areas on a 1-5 scale, where (1) is "no knowledge or experience" and (5) is "extensive professional experience". If you're not sure, feel free to leave it blank. Just place the number next to the corresponding areas listed here: • coding o comp-sci fundamentals (data structures, big-O notation) o C or C++ programming o Go programming o git usage o git internals o shell scripting o ruby programming • troubleshooting o debuggers (gdb, lldb) o profilers (perf, oprofile, perftools, strace) o network flow (tcpdump, pcap) • large system design o unix processes and threads o sockets o signals o mysql o redis o distributed systems • operational experience o reading and debugging code you’ve never seen before o helping other engineers understand and navigate production systems o handling large scale production incidents (external communications, internal coordination)

They asked me to clarify which interview or context they were referring to, since the question was a bit open-ended. I assume they wanted to know about a key moment or question from a past discussion—maybe something like 'What drives you to provide accurate answers?' or 'How do you handle ambiguous queries?'

IT Infrastructure

Interviewed at Tujuh Utama

Apr 8, 2025

They asked me to clarify which interview or context they were referring to, since the question was a bit open-ended. I assume they wanted to know about a key moment or question from a past discussion—maybe something like 'What drives you to provide accurate answers?' or 'How do you handle ambiguous queries?'

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