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A-J Mäki, PhD

Data Engineer & Passionate Data Guy

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🤓 Welcome to My Work Portfolio

Passionate and experienced data guy 🤓 with a strong background in 🧮 mathematical modeling and 🎛️ control engineering. Currently, working as a 👨‍💻 Senior Data Engineer @Siili and building resilient data solutions for the customers using modern cloud platforms and tools like Azure (especially Azure Data Factory and Azure DevOps), Databricks, Microsoft Fabric, Snowflake, Python, and PostgreSQL.

💼 Reach me via

📑 Click here to open my resume (pdf)

🔍 By the way, Siili is constantly looking for talented persons, check out our 👉 open positions 👈 or just drop me a message ✉︎.

🛠️ Skill & Tools

As the saying goes, a picture is worth a thousand words. Here’s a visual summary of my skills and the tools I use.

Other Technical Skills: MATLAB, Simulink, COMSOL (FEM), git, Powershell, Crosser, GitHub Pages, Markdown, bash, Linux (Ubuntu/WSL)

Education

Work Experience

👨‍💻 Senior Data Engineer @Siili (Feb 2026 - Present)

👨‍💼🎯🧠 GenAI Operational Accelerator – Tech Lead & Architect @Solita (Sep 2025 - Jan 2026)

👨‍💻 Data Engineer @Solita (Mar 2023 - Jan 2026)

👨‍💻 Data Engineer @Futurice (Oct 2022 - Feb 2023)

👨‍🔬 Academy - Various Positions, Tampere University (2006-2022 full-time, 2022-2024 part-time)

See full records of over 15 years in academia in 👉👨‍🔬 My Academic Portfolio👈. Shortly, I developed mathematical models using FEM/COMSOL and MATLAB & Simulink, conducted data analysis with MATLAB, designed various control systems, and developed microfluidics chips. Below, I briefly summarize my postdoc era; from late 2022 I continued part-time as Visiting Scholar until 2024 — see my Academic Portfolio for details.

👨🏼‍🎓 Postdoctoral Research Fellow @Tampere University (Sep 2018 - Oct 2022)

As a postdoc in Professor Pasi Kallio’s Micro- and Nanosystems Research Group, I developed data analysis methods for several challenging biosignals. Additionally, I worked as professor Kallio’s Vice-PI in a multidisciplinary team combining cell biologists and engineers, and led a group of researchers developing a novel vascular-on-a-chip platform for 3D cell co-cultures.

Certifications

See more info in Credly.

🏆 Awards

🏅 The Clippy Award 2024 — Solita

Awarded to a colleague always ready to help and always sharing his knowledge — for example through mentoring and by driving several internal study groups that raised the team’s know-how of modern technologies.

📂 Projects

Data Engineering Services | Private Company, Finland (NDA)

📅 Sep 2026 - Present
🚀 Role: Senior Data Engineer
🔌 Industry: Heavy machinery | Data: Operational & Analytical

🌟 Key Contributions

🛠️ Tech Stack

Data Engineering Services | Private Company, Finland (NDA)

📅 Apr 2026 - Aug 2026
🚀 Role: Lead Senior Data Engineer
🔌 Industry: Food Industry | Data: Operational & Analytical

🌟 Key Contributions

🛠️ Tech Stack

GenAI Platform | Siili (In-house Project), Finland

📅 Feb 2026 - Mar 2026
🚀 Role: Data & AI Engineer
🔌 Data: Analytical

🌟 Key Contributions

🛠️ Tech Stack

GenAI Operational Accelerator | Solita (In-house Project), Finland

📅 Sep 2025 - Jan 2026
🚀 Role: Tech Lead / GenAI Solutions Architect / Project manager / Scrum master
🔌 Data: Operational & Analytical

🌟 Key Contributions

🛠️ Tech Stack

Data Engineering Services | Private Company, Finland (NDA)

📅 Mar 2024 - Jun 2025
🚀 Role: Data Engineer
🔌 Industry: Energy Sector | Data: Operational & Analytical

🌟 Key Contributions

🛠️ Tech Stack

Data Engineering and Analytics Services | The Football Association of Finland ⚽︎

📅 Aug 2023 - Dec 2024
🚀 Role: Data Engineer and Data Analyst
🔌 Industry: Sport Sector ⚽︎ | Data: Operational & Analytical

🌟 Key Contributions

🛠️ Tech Stack

Industrial IoT Data Engineering Services | Collaboration with Nokia, Snowflake, and Crosser

📅 Jan 2024 - Jun 2024
🚀 Role: Data Engineer and Data Analyst
🔌 Industry: Industry 4.0 | Data: Operational

🌟 Key Contributions

🛠️ Tech Stack

Developing Machine Learning Capabilities | Public sector organization in Finland (NDA)

📅 May 2023 - Apr 2024
🚀 Role: Machine Learning Engineer and Data Scientist
🔌 Industry: Public Sector | Data: Analytical

🌟 Key Contributions

🛠️ Tech Stack

Data Engineering Services | Finnish retail company (NDA)

📅 Dec 2022 - Feb 2023
🚀 Role: Data Engineer
🔌 Industry: Retail Sector | Data: Operational

🌟 Key Contributions

🛠️ Tech Stack

For my own and hobby projects, see 👉🗂️ My Projects 👈.

📊 Trainings 💻

Connected Data Architect Academy (CoDa), Solita

📅 Jan 2025 - Dec 2025

A year-long internal academy (~one day/month) for passing on Solita’s diverse architectural expertise across countries and units. Rather than a technology deep-dive, it develops human skills, general architect skills, and business skills & customer insight, covering topics such as architect–project lead co-operation, architecting the big picture, and customer insights.

Industrial Data Hothouse, Solita

📅 May 2023 - Jun 2023

In this 4-week long program, participants learned the concepts of industrial data and OT-IT convergence, edge computing and hybrid cloud in manufacturing and industrial data modelling and contextualization. We considered multiple technologies and partners, especially in Industrial IoT (IIoT) perspective, for example Snowflake, Databricks, Crosser.io, Litmus, Nokia MX Industrial Edge, cybersecurity, Docker, OPC UA, and MQTT.

Agile Data Engine (ADE) for Data Engineers, Agile Data Engine

📅 Apr 2023

The key areas of this certificate are the following: 1) introduction to using ADE, 2) Hands-on training in a streamlined data warehouse project, 3) Comprehensive theory on ADE features and data modeling concepts. After this one week training, participants can successfully import, model, and publish data.

📝 Blogging

I share my thoughts from time to time (all posts 👉here); my latest posts are following:

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