Explore all training, services, application development and digital toolkits.
72 offers
Excel spreadsheet repair service. Broken formulas, incorrect totals, or calculation errors diagnosed and corrected. One workbook, fixed price.
Freelance data cleaning service. Remove agreed duplicates, standardise fields, and flag missing data in your CSV or Excel list. Up to 5,000 rows.
Custom Excel or Power BI dashboard built from your data by a freelance dashboard developer. Sales, costs, or operations in one focused report. Fixed scope.
Freelance PowerPoint designer. Turn supplied content into a clear, consistent, professional presentation. Layout, typography, charts, and visual consistency fixed. Up to 8 slides.
SQL query consultant. Have a SELECT query reviewed for incorrect results, slow performance, or unnecessary complexity. One query, fixed price.
Excel report automation with Power Query. Replace manual copy-paste with one refreshable workflow. Ideal for weekly or monthly recurring reports.
Talk through one work problem and leave with a short, practical action plan.
5 live lessons, one structured learning plan. Save €27 compared with individual lesson prices.
3 live lessons, one structured learning plan. Save €20 compared with individual lesson prices.
AI prompt optimization consultant. Get your ChatGPT, Claude, or Copilot prompts reviewed and rewritten against explicit goals and test examples for more reliable results.
Learn to diagnose the spreadsheet bottleneck. Practise with Martin in a live online lesson.
Learn to turn a question into a query plan. Practise with Martin in a live online lesson.
I’m a freelance data consultant and Excel expert with more than 16 years of experience across engineering, data, and business. I build practical tools and solve reporting problems, drawing on operational analytics at Bankers Petroleum Albania and AI evaluation and human data management at micro1.
I hold a Master’s in Petroleum Engineering and am pursuing a PhD. My approach is practical: understand the system, question the assumptions, and build something useful.
Get to know Martin martin.dudumi@gmail.comMix individual lessons, toolkits, and non-app services. Your bag calculates the saving automatically.
App builds and learning packages are excluded. Packages have their own savings. Each different offer counts once. For services marked “from”, the discount applies to the starting budget until the final quote is agreed.