Data engineering, BI, Kaggle and machine-learning notes from building real projects.https://nihalsulaiman.com/en-cahttps://nihalsulaiman.com/blog/github-actions-minutes/https://nihalsulaiman.com/blog/github-actions-minutes/2,391 of 2,000 free minutes, gone in about five hours. The billing detail I missed, and the guardrails I now put on every workflow.Tue, 03 Nov 2026 00:00:00 GMTGitHub ActionsCI/CDMLOpsCosthttps://nihalsulaiman.com/blog/leak-free-validation-casmi/https://nihalsulaiman.com/blog/leak-free-validation-casmi/My offline score said 0.930. The leaderboard dropped from 0.415 to 0.371. How I built a 300-molecule hold-out that finally agreed with the leaderboard.Mon, 02 Nov 2026 00:00:00 GMTKaggleValidationMachine learningData leakagehttps://nihalsulaiman.com/blog/hello/https://nihalsulaiman.com/blog/hello/Who I am, what this blog will cover and why every post comes with the numbers and the parts that didn't work.Sun, 01 Nov 2026 00:00:00 GMTCareerData analytics