Real, anonymous reports from people who interviewed for Software Engineer at Mercor, newest first and distilled into what to expect across the loop.
I had a really rough start with scheduling. The first interview got cancelled after I had already been set up for it, and then the second one ended up lasting only about five minutes.
After I applied, the first part was an online HackerRank-style assessment with three sections. It mixed data/algorithms, data pipelines, and SQL-style questions, so I ended up jumping between very different problem types back to back.
The interview process typically starts with a recruiter call, followed by an online assessment and various AI-driven interviews, culminating in a longer 'super day' style setup that can last several hours. Candidates noted that the scheduling can be disorganized, with some experiencing cancellations or rushed interviews.
Candidates face a mix of technical assessments, including coding challenges, data structures, algorithms, and system design questions, often delivered through AI platforms. The assessments can vary in difficulty and format, with some candidates feeling overwhelmed by the volume and variety of questions.
The AI interviews are generally structured and tailored to candidates' resumes, but experiences vary widely; some find them efficient and engaging, while others feel disconnected and mechanical. Candidates are advised to ensure their responses align closely with their background to maximize the effectiveness of the AI's questioning.
Interviews often blend behavioral questions with technical discussions, assessing both problem-solving skills and cultural fit. Candidates should prepare to articulate their thought processes and reasoning clearly, as interviewers focus on understanding their approach rather than just the final answer.
The overall difficulty of the interviews is perceived as high, with candidates reporting a demanding atmosphere that tests their technical knowledge and reasoning under pressure. Many candidates expressed frustration over rushed interviews or disorganized processes that impacted their performance.
Candidates noted a lack of feedback following interviews, which left them uncertain about their performance and the reasons for any rejections. Clear communication throughout the process is inconsistent, with some candidates experiencing awkward interactions or unengaged interviewers.