About Me

Financial Accountant & Finance Expert

Mihai Adrian Mateescu

Welcome to my portfolio

Dedicated Financial Accountant with experience in accounting and financial management, specialized in detailed analysis of business transactions and tax reporting. With a strong passion for numbers and a keen eye for detail, I constantly seek opportunities to further develop my professional skills.

Currently: Continuing education as Certified Accountant (IHK)

Competencies

Honest self-assessment of my professional and technical skills

Skills & Expertise

Technologies and tools I work with to build scalable, high-performance solutions.

Financial & Payroll Accounting (DE)

Advanced — 2+ years professional experience

  • Financial Accounting: Accounts Receivable, Payable, General Ledger Advanced
  • Payroll Accounting & Salary Processing Advanced
  • Sales Tax Advance Returns (monthly/quarterly) Advanced
  • Monthly and Annual Financial Statements (BWA, P&L, Balance Sheet) Advanced
  • DATEV, Agenda, Simba (tax office software) Advanced
  • SelectLine, Modality, ELO DMS (current) Advanced

Financial Accountant since 08/2023 (modal3, Kesen, Herrmann, Quadriga) • Certified Accountant (IHK) in training, exam 03/2026

E-Commerce Ops & Compliance (EU/DE)

Advanced practitioner

  • Shopify & Amazon Seller (EU) Advanced
  • LUCID/VerpackG, GDPR & Google Consent Mode v2 Advanced
  • WEEE/ElektroG, GTIN & GTIN-exemption Intermediate
  • Printful/Spreadshirt/SPOD Logistics Advanced
  • Google Merchant, Ads, Analytics Advanced

AI/ML Systems — Learning & Research

Learning / Research (non-expert)

  • LLM/RAG Prototypes (Ollama, llama.cpp, Qdrant) Intermediate
  • PyTorch / TensorFlow & scikit-learn Intermediate
  • MLflow & Experiment Tracking Intermediate
  • CPU-first Performance Tuning (BLAS/AOCL) Intermediate
  • Semantically Driven Tokenizer (Project) Intermediate
  • LLM from Scratch: Gemma 3 270M Reconstruction (Rust/Julia) Intermediate

Pair-programming: GPT-5 Thinking, Claude Code, Gemini Code Assist

Software & Web Development — Learning

Learning (AI-assisted co-creation)

  • React / Next.js 15, Tailwind, i18n Intermediate
  • Flask / FastAPI; Rust (Axum) Basics Intermediate
  • Apache Arrow/Parquet, Polars Intermediate
  • Docker, GitHub Actions, Linux Basics Intermediate

Code generated/debugged with AI; Design + Architecture + Research by me

Languages

  • Romanian (Native) Expert
  • German (telc B2 Certificate) Expert
  • English (Very good) Advanced

Soft Skills & Leadership

  • Communication & Customer Service Expert
  • Team Leadership (up to 9 employees) Advanced
  • Attention to Detail & Quality Control Expert
  • Time Management & Prioritization Expert
  • Commercial Management & Business Administration Advanced

Legend — Proficiency Levels

  • Expert Productive use, repeated proof in multiple projects
  • Advanced Constant practice, autonomy in typical tasks
  • Intermediate 50–200h guided practice, basic knowledge consolidated
  • Learning / Research In Entwicklung — Konzept teilweise validiert, nicht produktiv

Hobbies & Interessen

Photography

Photography

I passionately photograph landscapes, portraits and urban scenes. Using Adobe Photoshop, I edit my shots to create unique visual representations.

Technology Enthusiast

As a passionate autodidact, I explore new technologies through personal projects and online courses. I actively learn programming languages and experiment with digital tools to continuously expand my skills.

  • Self-Learning: Rust, Julia, Python through online courses and hobby projects
  • Testing new digital tools for personal finance management
  • Exploring AI concepts as Independent Researcher (beginner level)
E-Commerce: Profit Minds

E-Commerce: Profit Minds

Profit Minds is my own brand for sustainable, personalized clothing and accessories. This project combines my interests in design, e-commerce and marketing, allowing me to implement my creative ideas.