How to check your business partner Due diligence in five minutes: verify professional history, digital footprint, and red flags before you sign anything. Published 2026-02-03 · 6 min read · CheckMate Blog Before you hand someone access to your company — equity, bank account, API keys, clients — know who they are online. CheckMate.bio won't replace a background check service, but it gives you the fast, cheap first pass that often reveals more than any vetted report. What to look for Professional accounts: LinkedIn, GitHub, AngelList, Crunchbase, Behance, Dribbble, Substack, Medium — does the footprint match their pitch?Finance and crypto: connected wallets, exchange accounts, PayPal, Stripe, Wise. Their presence isn't damning, but their complete absence when the person claims fintech experience is a flag.Consistency of identity: same name, same photo, same bio across platforms suggests a real professional presence. Inconsistent usernames or display names with different biographies sometimes mean something.Adjacent categories: accounts on forums, adult platforms, or gambling sites aren't disqualifying by themselves, but they add texture. A partner who says they're grinding seven days a week and has a very active gaming or streaming footprint is someone you should ask questions of. Running the check Enter the partner's primary professional email at checkmate.bio. If they have a separate personal email, run that too — people often maintain a cleaner front with work addresses.Skim the category counts on the initial report. Unusually low counts for a claimed public figure is itself data — it means they've either scrubbed their presence, or the online presence was never there.Unlock the detailed report and focus on 'Professional', 'Finance', and 'Tech' categories first.Open each profile link. Cross-reference LinkedIn role titles against GitHub activity or published writing. Inflated experience often shows up as a thin track record behind a confident profile.Look at 'Account created' dates. A LinkedIn profile from 2009 with decade-spanning endorsements is different from a profile created last month. What good results look like A solid business partner usually has a coherent, long-tailed digital footprint: a professional profile with real endorsements, a personal site or blog that matches their stated expertise, and accounts consistent with the story they tell. You want breadth, consistency, and age — and you want the claims in their pitch to match what you can verify independently. What the results actually mean CheckMate.bio groups findings into categories (social, gaming, dating, adult, finance, professional, and more) and attaches a confidence score to every match. A score of 80% or higher means the email is almost certainly linked to that service. A score between 50% and 80% is a likely match. Anything below 50% lands in the 'Possible matches' section and should be treated as a weak signal, not a verdict. Categories show the kind of accounts that exist — the shape of someone's online footprint.Per-service fields (usernames, display names, bio text, last active dates) help you confirm whether the match is really the person you care about.Confidence scores help you separate solid matches from noise. Treat low-confidence hits as leads to investigate, not as proof. A note on ethics CheckMate.bio indexes public and breach-derived data. It does not grant access to private messages, passwords, or anything you wouldn't be able to find with enough patience and the right search queries. Use it for the same reasons you'd Google someone — safety, due diligence, re-connecting with people, or simply knowing what a public profile says about you. Be honest about your reasons, and respect the answer you get.