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Village websites currently generally only provide information in the form of an interface for users, such as village profiles, potential areas, population data, and current news. However, the majority are not yet equipped with Application Programming Interface (API) support that allows for flexible and automated data integration and exchange. This is a challenge when dynamic access is needed by third-party systems, such as public service platforms, mobile applications, or local government information systems, which require real-time and accurate synchronization of population data. The project aims to implement a RESTful API that can be accessed securely, efficiently, and easily understood by developers to retrieve villagers' data. The development of the system is carried out using the Agile method, which supports rapid iteration and periodic evaluation to ensure that each feature functions optimally according to the needs of users and field conditions. This Agile method is applied in several sprints that include the stages of needs planning, designing the API endpoint structure, coding, documentation, and testing of the integration and security of the system as a whole. The results of the implementation show that the API successfully retrieves data directly from the village database, and presents it in a JSON format that is compatible for use by both frontend and third-party systems. This API supports pagination features for efficient access to large amounts of data, and is equipped with Basic Authentication to keep data access secure from being abused. With this API, the village website not only becomes a static information medium, but also transforms into a digital service platform that is open for cross-system integration. This supports the development of a more modern, efficient, sustainable, and collaborative village information system in the future, so that public services can be significantly improved.

This research explores the effectiveness of heuristic techniques for solving combinatorial optimization problems, with a particular focus on the Traveling Salesman Problem (TSP). Combinatorial optimization is a critical area of study, especially in fields like computer science, engineering, and economics, where finding optimal solutions from a finite set of possibilities is crucial. However, the NP-hard nature of many combinatorial problems, such as the TSP, makes traditional exact methods like Branch-and-Bound and Dynamic Programming computationally expensive and inefficient for larger problem sizes. The primary objective of this research is to evaluate the performance of heuristic methods, including Simulated Annealing (SA), Genetic Algorithms (GA), and Iterative Computation techniques, such as Tabu Search (TS) and Particle Swarm Optimization (PSO). These methods are tested for their ability to provide approximate solutions efficiently. The findings reveal that while ACO provided the best solution quality, it had the longest runtime. TS was the fastest, though with slightly lower solution quality. SA and GA demonstrated a balance between solution quality and computational efficiency, but their performance heavily depended on parameter tuning. The hybridization of SA and GA showed potential for improving solution quality but introduced additional complexity. The research concludes that heuristic methods, especially when combined, offer viable solutions for large-scale combinatorial optimization problems, though the trade-off between solution quality and computational time must be considered when selecting an algorithm.

This community service activity aims to strengthen the character development of elementary school students through training in creating digital applications using the Thunkable platform. In the midst of the digital era and the challenges of the Industrial Revolution 4.0, character education is an essential aspect that must be instilled from an early age, alongside cognitive competence. Elementary schools, as the foundation of education, play a strategic role in shaping children’s personalities, including embedding positive character values. This activity was conducted at SD Moria in Sorong City and involved 24 students from grades 5 and 6, selected based on their interest and readiness. The training used a Project-Based Learning approach, where students were actively engaged in creating simple application projects. Throughout the process, students not only learned basic programming skills using Thunkable but also developed key values such as teamwork, responsibility, independence, creativity, and curiosity. Despite facing challenges such as limited devices and internet access, the students demonstrated remarkable enthusiasm. Thunkable proved to be an effective tool for interactive and enjoyable learning. Students were able to directly develop their creative ideas through designing user interfaces and application functions. This provided a meaningful learning experience that motivated students to continue exploring and trying new things. The activity showed that technology-based learning can serve as a strategic means to holistically shape students' character. Overall, this initiative demonstrated that digital application development training can serve as a character education model based on technology that is highly relevant for elementary education. This program is expected to serve as an educational innovation example that encourages the integration of digital literacy and character education in Indonesian elementary schools.

This training activity on application development using the Thunkable platform was designed to enhance digital literacy, logical thinking skills, and strengthen the character of adolescents through a Project-Based Learning (PjBL) approach. In today’s digital age, digital literacy is an essential competency, and equipping young people with the ability to create meaningful technology empowers them to be not just users but also creators of impactful digital solutions. The training took place on May 17, 2025, at a member’s house from the GKI Kasih congregation in Perumnas, Sorong. It was attended by 20 participants aged between 12 and 17 years. The choice of a familiar and friendly setting was intended to create a comfortable and collaborative learning environment. The training materials were structured step-by-step, starting with an introduction to the Thunkable platform, user interface (UI) design, navigation logic development using visual block programming, and culminating in group presentations and reflections on the final projects. The project theme chosen for the training was "Prophets as Role Models," aimed at integrating spiritual values and character development into an educational digital application. Through this project, participants not only gained technical skills but also reflected on the moral and inspirational values of prophetic figures in the Christian faith. Evaluation results showed that the training had a significant positive impact. Participants demonstrated increased understanding of app development concepts, were able to explain their project workflows and features, and showed high levels of enthusiasm and creativity throughout the process. Furthermore, character values such as teamwork, responsibility, and a strong learning spirit were fostered. This initiative serves as a concrete example of how technology-based education can be effectively combined with character formation. It also provides a replicable training model for other communities, particularly for church-based youth development programs that aim to nurture digitally literate and morally grounded future generations.

The integration of digital technology in education serves as a strategic solution to enhance learning access, particularly for students in regions with limited educational infrastructure, such as Sorong City, Southwest Papua. This community service program was designed to introduce and provide training to junior high school students in the use of the Thunkable application as a tool for mobile-based learning media. Thunkable is a visual drag-and-drop platform that enables users to design functional mobile applications without the need for prior programming knowledge. The method employed in this activity is based on the Research and Development (R&D) approach using the 4D model, which consists of four stages: Define, Design, Develop, and Disseminate. In the Define stage, the needs and digital readiness of the target group were assessed. The Design and Develop stages involved creating a training module and conducting hands-on workshops where students were guided step-by-step to create simple educational apps. In the final Disseminate stage, the outcomes were evaluated and shared for broader use. The results of this initiative revealed high levels of enthusiasm among the participants. Students were actively engaged and demonstrated the ability to independently design simple learning applications by the end of the training. This indicates that the use of Thunkable not only increases students' digital literacy but also enhances their self-directed learning, creativity, and technological confidence. Overall, this activity illustrates the potential of mobile learning tools to support inclusive and adaptive education in remote communities. By equipping students with practical digital skills, it lays the foundation for long-term educational innovation and empowerment. Therefore, the use of Thunkable can be considered an effective and accessible alternative to foster meaningful learning experiences across diverse educational contexts.

This study focuses on the development and implementation of “Pasar Kita,” a web-based marketplace system designed to facilitate digital transactions for traditional market sellers and consumers. The system was developed using PHP as the backend programming language and MySQL as the database management system. The purpose of this project is to address the digital gap experienced by traditional market vendors who have limited access to modern e-commerce platforms. The research includes a needs analysis, system design using UML diagrams, implementation of main features such as registration, login, product management, transactions, checkout, and order tracking, followed by system testing. The results show that all major functions operate properly, including user authentication, product uploads, order processing, and payment simulations via transfer or cash-on-delivery (COD). System testing indicates that the platform meets usability, functional, and responsiveness criteria. The findings highlight the system’s capability to support local economic digitalization by providing an accessible and user-friendly marketplace for traditional market vendors and consumers.

This service program aims to provide mentoring to students of SMK Negeri 3 Sorong through the utilization of mobile learning technology using the Thunkable application. Thunkable is a drag-and-drop-based platform that allows users to design interactive mobile applications without complex programming. The mentoring program was designed to enhance students’ digital literacy, foster creativity, and strengthen their understanding of subject materials through the development of self-made interactive media. The method employed in this activity involved a participatory approach, including workshops, technical guidance, and learning outcome evaluations. The results showed that students were able to develop simple applications tailored to their learning needs and demonstrated increased motivation and independence in the learning process. Furthermore, students gained hands-on experience in designing and implementing technology in practical contexts. This approach has proven effective in bridging the gap between the school curriculum and the technological skills required in today’s workforce. Therefore, using Thunkable as a mobile learning tool presents an innovative alternative in vocational education and training.

The transformation of education in the digital era demands inclusive, creative, and relevant learning innovations in line with technological developments. To address these challenges, utilizing digital platforms is a strategic step in driving the digitalization of education. One innovative solution that is becoming widely used is no-code platforms like Thunkable, which enable users, including students, to create applications without having to master complex programming. This article reviews the results of a community service activity conducted at SMA Negeri 2 Sorong City, focusing on improving digital literacy and strengthening 21st-century skills through training in creating educational applications based on Thunkable. This activity utilized experiential learning and project-based learning approaches, implemented through hands-on training, interactive demonstrations, independent practice, and participatory evaluation. This training not only targeted students as the primary participants but also involved teachers as facilitators who accompanied the learning process and encouraged the application of training outcomes in classroom activities. Evaluation results showed a significant increase in student enthusiasm, critical thinking skills, and creativity in designing simple educational applications tailored to learning needs and local contexts. Despite obstacles such as limited digital devices and uneven internet access, this activity still succeeded in creating an innovative and transformative learning space. Furthermore, this training makes a significant contribution to supporting the implementation of the Pancasila Student Profile, particularly in the areas of digital literacy, independence, mutual cooperation, and creativity. It also serves as an effective means to instill the value of digital responsibility and foster a learning culture that is adaptive to technological change. The success of this program demonstrates that a simple yet applicable technology-based approach like Thunkable can be replicated in other schools, particularly in the 3T (disadvantaged, frontier, and outermost) regions, with the support of structured and collaborative training.

State Senior High School 7 Surakarta is one of the public schools located in Surakarta City. The library activities, including member data management, book processing, and book borrowing and returning, are still conducted manually using physical logbooks. This manual process is considered inefficient and prone to errors. The purpose of this study is to develop a book borrowing system at State Senior High School 7 Surakarta that serves as a tool to assist officers in recording, loans, and returning books. This system is designed using the CodeIgniter framework to support WEB displays, programming in PHP, and using MySQL for database management. This system is created using the System Development Life Cycle (SDLC) method with a waterfall model that includes the stages of analysis, design, implementation, testing, and maintenance. System testing was conducted using Black-Box Testing and the System Usability Scale (SUS). The Black-Box Testing results showed that all features and functions operated correctly. The SUS evaluation produced a score of 75.68%, indicating that users generally agreed with the implementation of the system, which falls under the "acceptable" classification.

The study presents a comprehensive framework for optimizing customer retention budget by integrating clustering, classification, and mathematical optimization techniques. The study begins with the IBM Telco dataset, which is prepared through data cleansing, encoding, and scaling.  In the preliminary phase, customer segmentation is performed using K-Means clustering, with k = 3 and k = 4 identified as optimal based on the elbow method and Silhouette score. The configurations produced three (Premium, Standard, Low) and four (Premium, Standard Plus, Standard, Low) customer segments based on purchase preferences, which served as input features for churn prediction. In the second phase, the dataset was divided into training and test sets in an 80:20 ratio, followed by data balancing using the Synthetic Minority Over-sampling Technique (SMOTE) and Edited Nearest Neighbors (ENN). Multiple classification algorithms were evaluated, including Naive Bayes (NB), Random Forest (RF), Categorical Boosting (CatBoost), Light Gradient Boosting Machine (LightGBM), Extreme Gradient Boosting (XGBoost), Gradient Boosting (GB), Support Vector Machine (SVM), Logistic Regression (LR), K-Nearest Neighbors (KNN), and Multi-Layer Perceptron (MLP) using F1-score as the performance metric. CatBoost and LightGBM, with k values of 3 and 4, respectively, were the highest-performing classification models, with only minimal differences in performance.    Ultimately, customer segmentation established customer prioritization, whereas churn prediction assessed customer churn likelihood. Four distinct configurations were assessed utilizing mixed-integer linear programming (MILP) to optimise retention budget allocation within uniform budget constraints, discount amounts, and churn thresholds. In both the k=3 and k=4 scenarios, CatBoost surpassed LightGBM, with CatBoost at K=3 effectively discounting 66% of at-risk consumers across all three segments, hence improving the intervention's efficacy and budget allocation, making it the ideal choice for maximizing customer retention. The results demonstrate the importance of segmentation in enhancing retention budgeting and budget optimization, particularly concerning parameter sensitivity.

 The increasing use of electric vehicles in last-mile logistics distribution demands efficient and strategic charging infrastructure. This study aims to determine the optimal location for electric vehicle charging stations in Semarang City using the Set Covering Problem approach. A total of 17 last-mile distribution points operated by a logistics company were analyzed based on geographic data consisting of latitude and longitude coordinates, which were then processed into a distance matrix using the Euclidean formula. The optimization model was developed under the constraint of the electric vehicle’s maximum coverage radius and solved using binary linear programming. The analysis revealed that a single charging station located in Central Semarang is sufficient to cover all distribution points spread across the city. These findings reinforce the efficiency of the set covering approach in infrastructure planning and offer practical implications for logistics companies to optimize resources, minimize investment costs, and improve operational efficiency.

The rapid advancement of information technology demands higher education graduates to possess strong digital competencies, particularly algorithmic literacy. This form of literacy involves understanding data structures, programming logic, and computational thinking in problem-solving. This community service program aimed to strengthen algorithmic literacy among students as a foundational skill for building a professional career in the field of information technology. Conducted at the Information Technology Study Program of Universitas ‘Aisyiyah Yogyakarta, the program included need assessment, instructional material development, interactive training sessions, case-based group work, and evaluation through student presentations. The results showed significant improvement in students’ understanding of algorithms and their ability to design efficient and systematic solutions. By applying a problem-based and collaborative learning approach, students also developed essential 21st-century skills such as communication and teamwork. The case presentation-based evaluation provided comprehensive insights into their critical and logical thinking abilities. This program successfully contributed to preparing students not only as technology users but also as future innovators in the digital era.

The birth certificate archive management system at the Central Aceh Population and Civil Registration Office still uses manual methods, which causes data search and storage to be less efficient. Therefore, this study aims to design and develop a web-based birth certificate data archive information system with the Waterfall method so that the management of data is more effective, secure, and organized. The development method used is Waterfall, which consists of the stages of analysis, design, implementation, testing, and maintenance. This system was built using the PHP programming language with the Laravel framework, and using MySQL as a database. The results of implementation shows that this system is able to manage archives digitally, facilitate data search, and reduce the risk of loss or damage to physical documents. System testing is carried out using the Black Box Testing method, which shows that all main features of the system function in accordance with the designed specifications. Evaluations from users of the system also show that the system is easy to use and increases efficiency in managing birth certificate archives. With this system, it is expected that the population administration process at the Population and Civil Registration Office of Central Aceh can run faster and more accurately, and provide better services to the community.  

Object-Oriented Programming (OOP) is a programming paradigm that emphasizes the use of objects and classes to build modular and maintainable software. One of the fundamental concepts in OOP is polymorphism, which is the ability of objects from different classes to respond to the same method in different ways. This study aims to analyze the effectiveness of the polymorphism concept in directing software design in terms of code structure, development utility, and maintenance efficiency. The research method used is a literature study and program code simulation using a procedural approach compared to an object-oriented approach that applies runtime polymorphism. The results of the analysis show that the use of polymorphism can significantly reduce the number of lines of code, logical structure traffic, and facilitate feature expansion without the need to change existing code. Thus, polymorphism has proven effective in improving readability, reusability, and scalability of software design.

The problem of decision making for admitting new students at SMK Fajar Bogor is that they still use Microsoft Excel so they experience several obstacles and a lack of systematicity in decision making regarding new students at SMK Fajar Bogor.  This research aims to design an application to make the processing of prospective new students' grades easier and to design a more systematic decision-making application regarding the admission of new students to SMK Fajar Bogor. This research identifies the criteria for diploma grades, test scores, psychological test scores and zoning. The Simple Additive Weighting (SAW) method was used to design, develop and test a decision support system at the SMK Fajar Bogor school. This system is designed using the PHP programming language and MYSQL database. The results of the research are that the process of processing the grades of prospective new students becomes easier, decision making regarding the acceptance of new students at SMK Fajar Bogor becomes more systematic.

PT. Gemilang Sejahtera Abadi (GSA) is a company engaged in the oil palm plantation business, which is spread across the East Kutai Regency, precisely in Long Mesangat District. It is still difficult for office admins to monitor plantation results and production results by relying on paper records, via telephone and SMS, making it difficult to understand palm oil production data. The computerized system used when the research was conducted still used Microsoft Excel and Microsoft Word. The purpose of this study was to create a web-based Monitoring Information System Design application for the PT. Gemilang Sejahtera Abadi office admin. The method used is the Waterfall method which consists of 5 stages, namely: communication, planning, modeling, construction and system submission. The system created is web-based using the PHP programming language and MySQL database.The results of the study concluded that the design of the plantation production monitoring system for the office admin can be implemented and is expected to help the office admin in managing harvest data and can reduce errors in the data input process.

Abstract. A store requires an effective and efficient accounting information system to manage its finances, ensuring business continuity and financial sustainability. One such case is Am Collection Store, which has not yet adopted computer technology. The store still uses manual methods for cash receipts processing. This Cash Receipt Application was designed using the waterfall method, applied as a system development method, and utilizes PHP and MySQL programming languages. The objective is for Am Collection Store to record all cash receipts from sales without the need for manual bookkeeping. The system design tools used include UML, such as Use Case Diagram,  and Class Diagram. The result of this research is the design of a web-based accounting information system for cash receipts, which simplifies cash management to be more effective and efficient. Additionally, it produces detailed reports on matters related to the cash receipt processes from transactions conducted by both customers and sellers.

The problem faced by PT. Dinda Holding Company (DHC) is that it has difficulty in determining the best employees from a number of employees with varying performance qualities. Until now, the selection process has been carried out manually, taking into account the subjective assessments of the owner or store manager, without a structured evaluation system. As a result, employee selection tends to be inconsistent and leads to dissatisfaction among both employees and the business owner. Additionally, selected employees do not always demonstrate optimal performance, which impacts service quality and the operational sustainability of the store. Therefore, a decision support system was designed to assist PT. Dinda Holding Company (DHC) in selecting the best employees objectively, quickly, and accurately. Employees are human resources used as a driving force in the business operations of a company. The company faces the challenge of maintaining its competitive edge, which requires data on the performance of employees with good performance. This system applies the Simple Additive Weighting (SAW) method to perform calculations and evaluations based on predetermined criteria. The result of this system development is a desktop-based application using the Java programming language and a MySQL database, which is expected to assist management in making more measurable and structured decisions.

The activity aimed to improve Penjasorkes teacher ability in programming sport training. Participants of this program were sport teachers in Elementary Schools,  Junior High Schools, Senior High School, and Vocational High Schools in Majenang  District who were in a total of 30 people. This workshop was held in two steps, the first step was a conference about the training periodization concept and its supporting theories,  and the second step was programming sports training for athletes at the student level. This workshop showed that generally this activity was held in accordance to the planning.  All teachers understood the periodization concept and were able to program the training.  Therefore, this activity positively contributed to the sports teacher as one of the potentials to develop sports activity in Majenang District.

The development of information technology in the Industrial Revolution 4.0 era requires the younger generation to possess digital literacy skills, one of which is computer programming. Programming is not only a technical skill but also helps in developing logical, systematic, and creative thinking. This study aims to describe the implementation and results of Java-based basic programming literacy training for 30 SMA 3 students. The students were selected based on their interests and recommendations from teachers. The training was held in a computer laboratory, utilizing a learning-by-doing approach with methods that included material delivery, demonstrations, and hands-on practice. Evaluation was conducted through both theory tests and simple programming tasks. The results indicated an average 30% increase in understanding of structured programming concepts compared to before the training. Additionally, 85% of the students were able to successfully complete tasks involving the creation of simple programs using variables, operators, branching, and loops. Beyond the technical skills, the training also had a positive impact on non-technical skills such as self-confidence, teamwork, and critical thinking. In conclusion, this training program successfully met its goal of enhancing students’ basic programming literacy and can serve as a practical learning model that aligns with the needs of the digital era, encouraging active participation in the digital world.