From c07254f93a1c4db1a5f44ed38e4601ed472c6214 Mon Sep 17 00:00:00 2001
From: peter <peter@foster.net>
Date: Tue, 20 Jan 2026 23:07:36 +0100
Subject: [PATCH] Remove SIC code mismatch check from company verification

The SIC code mismatch check was flagging tech roles at companies not
registered as technology businesses. This is not a reliable measure
since many companies employ tech staff regardless of their SIC code.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../Services/CompanyVerifierService.cs        | 61 +------------------
 1 file changed, 1 insertion(+), 60 deletions(-)

diff --git a/src/TrueCV.Infrastructure/Services/CompanyVerifierService.cs b/src/TrueCV.Infrastructure/Services/CompanyVerifierService.cs
index c05b1ae..6801fbd 100644
--- a/src/TrueCV.Infrastructure/Services/CompanyVerifierService.cs
+++ b/src/TrueCV.Infrastructure/Services/CompanyVerifierService.cs
@@ -71,14 +71,6 @@ public sealed class CompanyVerifierService : ICompanyVerifierService
         "manufacturing", "operations", "trading"
     };
 
-    // SIC codes for tech/software companies
-    private static readonly HashSet<string> TechSicCodes = new()
-    {
-        "62011", "62012", "62020", "62030", "62090", // Computer programming and consultancy
-        "63110", "63120", // Data processing, hosting
-        "58210", "58290", // Publishing of computer games, other software
-        "61100", "61200", "61300", "61900" // Telecommunications
-    };
 
     public CompanyVerifierService(
         CompaniesHouseClient companiesHouseClient,
@@ -189,10 +181,7 @@ public sealed class CompanyVerifierService : ICompanyVerifierService
             // Check 4: Company size vs job title
             CheckCompanySizeVsRole(flags, accountsCategory, jobTitle, match.Item.Title);
 
-            // Check 5: SIC code vs job title mismatch
-            CheckSicCodeMismatch(flags, sicCodes, jobTitle, match.Item.Title);
-
-            // Check 6: Job title plausibility for PLCs
+            // Check 5: Job title plausibility for PLCs
             var (jobPlausible, jobNotes) = CheckJobTitlePlausibility(jobTitle, companyType);
             if (jobPlausible == false)
             {
@@ -500,53 +489,6 @@ public sealed class CompanyVerifierService : ICompanyVerifierService
         }
     }
 
-    private static void CheckSicCodeMismatch(
-        List<CompanyVerificationFlag> flags,
-        List<string>? sicCodes,
-        string? jobTitle,
-        string companyName)
-    {
-        if (sicCodes is null || sicCodes.Count == 0 || string.IsNullOrWhiteSpace(jobTitle)) return;
-
-        var title = jobTitle.ToLowerInvariant();
-
-        // Check if this is a tech role
-        var isTechRole = title.Contains("software") ||
-                        title.Contains("developer") ||
-                        title.Contains("engineer") ||
-                        title.Contains("programmer") ||
-                        title.Contains("data scientist") ||
-                        title.Contains("data analyst") ||
-                        title.Contains("devops") ||
-                        title.Contains("cloud") ||
-                        title.Contains("machine learning") ||
-                        title.Contains("ai ") ||
-                        title.Contains("frontend") ||
-                        title.Contains("backend") ||
-                        title.Contains("full stack") ||
-                        title.Contains("fullstack");
-
-        if (isTechRole)
-        {
-            // Check if company has any tech SIC codes
-            var hasTechSic = sicCodes.Any(s => TechSicCodes.Contains(s));
-
-            if (!hasTechSic)
-            {
-                // Get the primary SIC code description (simplified - just show code)
-                var primarySic = sicCodes.FirstOrDefault() ?? "Unknown";
-
-                flags.Add(new CompanyVerificationFlag
-                {
-                    Type = "SicCodeMismatch",
-                    Severity = "Info",
-                    Message = $"Tech role '{jobTitle}' at '{companyName}' (SIC: {primarySic}) - company is not registered as a technology business",
-                    ScoreImpact = -5
-                });
-            }
-        }
-    }
-
     private static (bool? IsPlausible, string? Notes) CheckJobTitlePlausibility(string? jobTitle, string? companyType)
     {
         if (string.IsNullOrWhiteSpace(jobTitle) || string.IsNullOrWhiteSpace(companyType))
@@ -875,7 +817,6 @@ public sealed class CompanyVerifierService : ICompanyVerifierService
         CheckDissolutionDate(flags, endDate, cached.DissolutionDate, cached.Status, cached.CompanyName);
         CheckDormantCompany(flags, cached.AccountsCategory, jobTitle, cached.CompanyName);
         CheckCompanySizeVsRole(flags, cached.AccountsCategory, jobTitle, cached.CompanyName);
-        CheckSicCodeMismatch(flags, sicCodes, jobTitle, cached.CompanyName);
 
         var (jobPlausible, jobNotes) = CheckJobTitlePlausibility(jobTitle, cached.CompanyType);
         if (jobPlausible == false)