Which contacts are missing?
Two lists compared in both directions. Missing records are separated from ambiguous and duplicate entries.
Explore the contact comparisonDATA · AUTOMATION · WEBSITES
Clean data.
Websites that work.
I prepare Excel and CSV data, build reports, automate recurring tasks, and create or improve business and portfolio websites.
One-off tasks or projects delivered in stages. We agree on the scope and result before work begins.
Agreed rules Checked calculations Clear deliverables
From separate files to one report
CSV sales_batch_aCSV sales_batch_b
Sales reportSample data
Total revenue in EUR1,130.30 EUR
Top 3 products by revenue
Totals reconciledAgainst the source files
01 / WORK EXAMPLES
Practical examples.
Clear results.
Explore the task, the approach and the result. These are self-initiated projects: the data examples use synthetic records, while the website example is this working portfolio.
Showing 5 work examples.
From data files to a clear sales report
30 sales and return records combined. Revenue calculated by product and currency.
Explore the sales reportX sales_analysis.xlsx
Your results in one Excel workbook
Data, formulas, summaries and charts. EUR and USD revenue shown separately.
Explore the Excel exampleChecking how software handles errors
A practical project using Python, pytest and Docker. See the example in my Freelancer portfolio.
View the testing example (opens in a new tab)
MatasFlow: from structure to a working website
Lithuanian and English content, services, project previews, direct file downloads and clear contact options. You can try the result here.
Explore the website project02 / HOW I CAN HELP
Clear scope.
Agreed deliverables.
I review your files, code or existing website and the result you need. We agree on scope, checks, price and deadline; broader projects can be delivered in stages.
01Excel and CSV data preparation
Combining one or several files and standardising data structures, columns and number formats using agreed rules. I check for missing data, duplicates and conflicts, and flag unclear records for review.
YOU RECEIVE Prepared data files, a summary of changes and records that need clarification.
02Contact and record list comparison
Comparing contact or other record lists in both directions to identify matches, missing entries and duplicates. Matching fields and rules are agreed in advance; ambiguous matches are separated for review.
YOU RECEIVE Comparison results in separate files, with unclear cases clearly flagged.
03Sales summaries and Excel reports
Combining sales files, calculating revenue by product, and presenting rankings, summaries and charts in one workbook. We agree on currencies, returns and duplicate transaction rules before calculating.
YOU RECEIVE An Excel report with source data, summaries, charts and reconciliation checks.
04Automation for recurring file tasks
A Python workflow for recurring file consolidation, data validation and report generation. We agree on input structure, processing rules and how to run it; broader processes are implemented and checked in stages.
YOU RECEIVE A reusable script, running instructions and a sample output.
05Python tests and bug reproduction
Tests for Python applications or individual modules using pytest, including bug reproduction, input and exception scenarios, and regression checks. I review the code before proposing testing scope and priorities.
YOU RECEIVE The agreed automated tests, running instructions, results and bug reports.
06Website updates and fixes
Updating text, images, contacts and links, improving layout and readability, and fixing page display issues. I first review the existing site, its platform and code before confirming the scope.
YOU RECEIVE Updated pages, a summary of changes and checks of the agreed functionality.See this MatasFlow website as an example →
07Business, portfolio and landing page creation
An informational business, service or portfolio website with clear structure, language versions, work examples, contact details and downloadable files. We agree on pages, content, design and launch tasks before starting.
YOU RECEIVE A working informational website, its source code and handover and update instructions.See this MatasFlow website as an example →
03 / HOW I WORK
From your sample
to a checked result.
I'm Matas. I work with data, Python and websites. I start by understanding what you need to improve and how we will check the result, then propose a practical plan.
- 01
Review your needs
Share your files, code or website link, the expected result and your deadline.
- 02
Agree on scope and stages
We define tasks, rules, checks, price and the deliverables for each stage.
- 03
Complete and check
I prepare the files or pages, run the agreed checks and hand over the result with explanations.
BEFORE WE START
A few common questions.
Are these real client projects?
These are self-initiated projects. The contact, sales and Excel examples use synthetic data. MatasFlow is my own working portfolio website.
How much will my project cost?
I quote after reviewing your files, code or website and understanding the scope and result you need. We can agree on one task or divide a project into stages with separate deliverables and prices.
Can I enquire about a broader project?
Yes. Share your goal and a sample of the available material. After reviewing it, I will propose the scope and stages I can deliver and discuss any additional requirements before work begins.
What kind of websites do you build?
I build informational service, business, portfolio and landing page websites. This MatasFlow site is a working example. Changes to an existing site are confirmed after reviewing its platform and technical structure.
Which file formats do you work with?
I work with CSV and Excel files, checking sheets, columns and data formats before starting. Other formats can be assessed from a sample.
Can the task be repeated later?
For repeatable work, we agree on the file structure and how the process will run. Python scripts come with running instructions.
04 / LET'S TALK
Have a task in mind?
Let's talk it through.
Tell me about the data, process or website you want to improve and the result you need. We will discuss the scope and a practical delivery plan.
WHAT TO INCLUDE IN YOUR MESSAGE
- Which files or website do you have?
- What result do you need?
- What is the scope: files, records or pages?
- When do you need it completed?