Tech: Journal of Engineering Science, Volume 1, Number 1 (2025) presents seven peer-reviewed scholarly articles addressing strategic issues in the fields of engineering and applied sciences, including IoT-based technology, renewable energy systems, environmental engineering, mining studies, and data-driven modeling. All articles in this issue are authored by researchers from one country, Indonesia, representing several regions such as the Special Region of Yogyakarta, Banten, East Java, West Java, and West Nusa Tenggara, and involving contributions from seven Indonesian higher education institutions, namely Universitas Pembangunan Nasional “Veteran” Yogyakarta, Universitas Gadjah Mada, Institut Teknologi Sepuluh Nopember, Institut Teknologi Bandung, Universitas Airlangga, Universitas Islam Indonesia, and Universitas Muhammadiyah Mataram. This diversity of regions and institutions reflects the journal’s commitment to inclusive and context-based national engineering research.

The articles published in this issue include:

1. Development of a Prototype IoT-Based Soil Temperature and Humidity Monitoring System for Shallot Plants by Yuyun Prastiwi, Cantika Risky Ramadhana Pawestri, Otto Santoso Putro, and Pramono (Universitas Pembangunan Nasional “Veteran” Yogyakarta).

2. Public Perception of Swine Farming Waste in Gancahan VIII Village, Sidomulyo, Godean, Sleman by Laire Sukma Arti Suci, Septina Lumbantobing, Zacqy Mahendra Yudha Supriyanto, and Dhimas Aditya Prayoga (Universitas Gadjah Mada).

3. Design and Construction of an Automatic Solar Tracker Based on Arduino Uno to Increase Solar Energy Absorption Efficiency by Santika Sari, Dyah Yulia Ratnadewati, Rizky Vera Oktarina, and Pramono (Institut Teknologi Sepuluh Nopember).

4. Analysis of Land Assimilative Capacity and Carrying Capacity as an Impact of Piyungan Industrial Area Development by Dandy Permana Putra, Mulyadi Ari Wibowo, Bidah Aprillia, Mufid Rona Nuansa, Nurul Anggraini Sulistyowati, and Jonathan Ginting (Universitas Pembangunan Nasional “Veteran” Yogyakarta).

5. Comparison of Non-Sulfide Nickel Extraction and Sulfidation Techniques to Improve Nickel Recovery from Crude at PT X by Muhamad Ismatulloh, Fahny Ardian, and Gabriel Ricardo Ananda Putra (Institut Teknologi Bandung).

6. Impact of Feature Selection on the Performance of KNN and SVM in Heart Disease Prediction by Dhiyaussalam, M. Helmy Noor, Herlinawati, and Isna Wardiah (Universitas Airlangga and Universitas Islam Indonesia).

7. Environmental Impact and Sustainable Solutions: A Case Study of the “Onto Deposit” Mining Area in Dompu Regency by M. Ahleyani (Universitas Muhammadiyah Mataram).