Kostas M.

I build and fix MS Access and Excel VBA systems for small businesses, with SQL Server and Power BI when you need them. I help you migrate aging database systems to newer technologies like web, Zoho, Power Apps and more. Top Rated Plus, 100% Job Success, $200K+ across 105 Upwork projects. ⭐ “Perhaps the highest skill level I’ve seen in the database space.” Paul Cracknell, OSR Enterprises Results from recent projects: • Built a 476,000-record searchable archive for a UK appliance rental company leaving a legacy system. Read-only Access front end on SharePoint, full search and PDF export • Migrated 25+ users to SQL Server with zero downtime • Automated invoicing that cut billing delays by 80% • Delivered 100+ Power BI reports for an agriculture and nursery operation: KPI dashboards, heat maps, SQL data model • Built a rebate and residuals engine for a US payment processor: tiered rate plans, VBA validation, automated Excel payout export, full audit trail • Replaced a MySQL-dependent nursery database with a fully local Access system for a US farm. Removed all ODBC dependencies and fixed six root-cause bugs • Built a multi-user order and inventory system on Azure SQL for a food distributor • Built a role-based CRM on SQL Server for a Dutch tourism company • Built a carbon credit management system: CORC ledger, sales tracking, automated payouts, role-based login • Built an Access compliance database used daily by AML teams across several departments What I build: • MS Access: CRMs, order management, invoicing, quoting and operations databases • Excel automation: VBA, Power Query and Power Pivot tools that remove repetitive work • Power BI dashboards and KPI reporting, standalone or on top of your Access or Excel system • Automated workflows: one-click reports, Outlook or Gmail delivery, document generation • SQL Server, Azure SQL and Dataverse back ends for multi-user setups • Upgrades and migrations of existing databases with minimal disruption Why a system you own: No subscriptions and no lock-in. It runs on the Microsoft Office tools you already have, your data stays on your network, server or a cloud you control, and your team can make everyday changes themselves. I work alone: no agency, no subcontractors. You talk to me from the first message to delivery, and I keep supporting the system after it goes live. Tell me what’s not working. I’ll look at what you have, give you my assessment and a clear plan before you commit to anything. Working demos are available if you want to try first.