Being the first security engineer in a startup that already operates for a few months or even years can be quite daunting. Starting up security is hard. Starting security in a company that has already gathered a huge security debt is even harder. This security checklist aims to help security engineers and CISOs in early stage companies to prioritize their efforts in the first months of their new job.<p>Any security engineers that were in this situation? Do not hesitate to share your feedback!