84.51° Data Engineer Interview Guide
The 84.51° data engineer loop, round by round: what each stage tests, example questions with the guidance interviewers actually score, the mistakes that sink strong candidates, and how to prepare.
What the 84.51° loop tests: domains and difficulty
Our prediction of the question mix by domain and difficulty for this company's data engineer loop, from live listings and interview reports.
The domain and difficulty mix we predict for a 84.51° data engineer loop, across 12 problems. It updates as more 84.51° data lands.
Try a 84.51°-style SQL round
Find every user active on 3 or more CONSECUTIVE days. This gaps-and-islands shape shows up in nearly every DE SQL round. Edit the query and run it against the seed data.
Practice the 84.51° loop
The problems our model expects in this company's interview, grouped by round. Work the shapes that come up, not the ones that read well on a list.
84.51° is hiring data engineers now
The roles behind this loop. Prep against the levels and locations they are actually filling.
Architect AI-ready data platforms that support both transactional and analytical workloads, with an emphasis on data product design, conformed dimensions, and patterns that accelerate AI and ML development (feature engineering, model training, and inference serving).
Lead design and development of Databricks-based solutions
We own 10 Petabytes of data, and collect 35+ Terabytes of new data each week sourced from 62 Million households.
Drive improvements in data engineering practices, procedures, and ways of working
84.51° compensation and culture
The numbers, tech stack, and team structure live on the company overview.
Compare 84.51° with other data engineering employers
How the role, pay, and loop stack up against peer companies.
Prepare at 84.51° interview difficulty
- 01
Reading a solution is not the same as writing one
Every engineer who has frozen on a query they had read a dozen times knows the gap. The only preparation that closes it is producing the answer yourself, under time, before the interview does it for you
- 02
76% of hiring managers reject on the coding task, not the resume
From HackerRank's 2024 Developer Skills Report. Candidates who look strong on paper still fail the live screen if they haven't done timed, executable practice
- 03
5 problem shapes cover 80% of data engineer loops
Dedup, sessionization, top-N-per-group, slowly-changing dimensions, partition tricks. Writing the shapes by hand turns the unfamiliar into pattern recognition