Thoughtworks Data Engineer Interview Questions
& Process

I went through Thoughtworks’ hiring process, and honestly, it was a frustrating experience. My resume got shortlisted, I cleared two technical rounds where I answered every question, and then—surprise—I was rejected in the managerial round. The reason? Apparently, I haven’t “explored” technologies like streaming, AI, and trending data systems. Funny, because none of these were even mentioned in the JD as mandatory skills. If these were essential, they should have been listed clearly so that I wouldn’t have applied in the first place. What’s even more baffling? I still managed to clear the technical rounds, so clearly, my skills were good enough up until then. Also, I was asked an optimization question, to which I provided multiple valid Spark optimization techniques. There were no follow-up questions, so I assumed my answer was satisfactory. But apparently, assumptions don’t work when dealing with a process as inconsistent as this one. If a company wants candidates with specific experience, they should be transparent from the beginning instead of leading people on for four weeks only to reject them for reasons that were never part of the requirements. This kind of hiring process doesn’t just waste candidates’ time—it also reflects poorly on the company’s professionalism.

First up was a 15 min chat with the recruiter. Then there were 3 actual rounds: the first was a hands-on technical challenge focusing on PySpark. Round two was another technical session, this time digging into Apache Flink and streaming pipelines. The final round was with the head of engineering, and it was more about leadership and culture.

The process was a bit long, with 4 stages. First contact with HR, then a technical interview, a cultural one, and finally an interview with leadership. The whole process took about 3 months, but I was called back after 6 months because they were closing deals with new clients. Since I wasn't in a hurry, the wait was fine. The recruiter was very helpful and answered all my questions.