MellonicLab
From: Poland
Location: Starowa Góra, PL
On Useme since 12 September 2026
About me
Automation, integrations and data for businesses. I deliver finished, working solutions: code, files, reports.
Scope: • API integrations: ERP, e-commerce, CRM (Comarch XL/Optima, Subiekt, enova, WooCommerce, BaseLinker, Allegro, IdoSell, Salesforce) • Data warehouses and ETL: BigQuery, PostgreSQL, SQL Server • Reports and dashboards from ERP: SQL, Excel/Power Query, HTML pages • Self-calculating Excel: profitability, bonuses, budgets, financial models • Data clean-up and migration, ERP imports • Data extraction from PDFs and documents (OCR + AI) • Backend and APIs: Python, Java/Spring, Docker, tests • Web tools, technical e-commerce audits (CWV, SEO) • B2B company lists from public registers, GDPR-compliant
How I work: brief → fixed quote within 24 h → delivery → 14 days of corrections included. No hourly rates.
I work with AI tools as support — I am directly responsible for quality, for keeping to what we agreed, and for communication.
Portfolio
erp_daily_report - raport z ERP: SQL→Excel→mail
Demo sample (fictional data): a Python script reads the ERP database on a schedule (read-only SQL), builds an Excel report on stock and turnover — conditional formatting, items to reorder, dead stock — and e-mails it.
api_to_warehouse — REST API do hurtowni (próbka)
Work sample: a Python script pulls REST API data page by page, asks only for changes since the last run, validates every record and loads it idempotently (MERGE) into SQLite or BigQuery. Re-runs create no duplicates.
Arkusz rentowności projektów i premii (Excel)
Work sample: an Excel workbook on formulas, no macros. Data goes in one place; the file calculates project profitability (revenue, cost, margin, budget), bonuses and a monthly summary. Drop-down lists flag wrong IDs.
Kalkulator wyceny na stronę WWW (próbka)
Demo sample (fictional price list): a single-file quote calculator to paste into a company website — one price list, tiered discounts, order minimum, summary ready to e-mail. No external libraries.
csv_erp_bridge - walidator importu CSV do ERP
Demo sample (fictional data): a Python script that prepares CRM or spreadsheet data for ERP import (Comarch, Subiekt, WMS): validates tax IDs, e-mails, codes, amounts, dates and duplicates, maps columns, reports each error with its row.