Leja Aprianza

Product Development & Full-Stack Engineering

Full-Stack Developer with 4+ years of experience building scalable digital products. Specialized in workflow automation, backend systems, and frontend interfaces for fintech and AI applications. Currently contributing to WeselAja, a BI-regulated cross-border payment fintech.

Website: https://leja.my.id|LinkedIn: https://linkedin.com/in/lejaaprianza|GitHub: https://github.com/lejaaprianza|lejaprianza@gmail.com|Bandar Lampung, Indonesia
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Work Experience

Product Development

atWeselAja

Nov 2025 - Present Bandar Lampung

  • Developed a subscription-based chatbot to help merchants manage their subscription customers efficiently.
  • Designed and implemented a scalable backend architecture using Supabase, including database schema design, authentication, API management, and PostgreSQL-based relational data modeling, with query optimization, indexing, and data integrity constraints to support chatbot and subscription workflows efficiently.
  • Built a responsive and scalable frontend application using Next.js, fully integrated with Supabase for real-time data handling and seamless subscription management.
  • Integrated multiple platforms including Supabase, n8n, Telegram, and the Xenith payment gateway to enable automated subscription management and secure payment processing.
  • Analyzed merchant requirements and translated business needs into technical solutions aligned with operational workflows.
  • Designed and optimized AI agent prompts to effectively handle various subscription-related user scenarios.
  • Improved chatbot conversational flow and UX to ensure a more intuitive, user-friendly, and frictionless experience for both merchants and end customers.
  • Implemented CI/CD pipelines using GitHub Actions, automating build, testing, and deployment processes to ensure faster and more reliable delivery while maintaining code quality and minimizing manual intervention.
Next.jsTypeScriptSupabasen8nPostgreSQLGitHub Actions

Frontend Developer

atTeman Data

Mar 2022 - Jan 2025 Jakarta

  • Built interactive and responsive frontend interfaces, including a chatbot extension, to enhance user engagement and real-time interaction.
  • Implemented dynamic data rendering by consuming backend API endpoints, ensuring accurate and up-to-date information across the application.
  • Enabled real-time communication by integrating a Socket.IO client with a Socket.IO server for seamless bidirectional data flow.
  • Developed data visualization dashboards using Next.js and ECharts, improving system monitoring, analytics clarity, and data readability.
  • Designed and implemented an interactive Traffic Map frontend using Next.js, Mapbox, and ECharts to effectively visualize and analyze traffic data.
  • Collaborated closely with backend and Web3 teams to integrate frontend interfaces with decentralized application (dApp) features.
  • Supported Web3 integration by bridging Web2 applications with blockchain-based services.
  • Wrote, tested, and deployed Ethereum smart contracts using tools such as Remix, Truffle, IPFS, and Web3.js to support decentralized workflows.
Next.jsReactSocket.IOEChartsMapboxSolidityWeb3.js

Other Experience

Machine Learning Path Student

atBangkit Academy led by Google, Tokopedia, Gojek, & Traveloka

Feb 2021 - Jul 2021 Remote

Selected as a Machine Learning cohort in Bangkit, a competitive Google-led career readiness program supported by industry partners such as GoTo and Traveloka, designed to prepare high-quality tech talent through industry-aligned curriculum and real-world project development.

  • Completed intensive industry-led program focusing on Machine Learning and applied AI development.
  • Built end-to-end ML projects including data preprocessing, feature engineering, model training, and evaluation.
  • Developed predictive models using Python, TensorFlow, and Scikit-learn.
  • Applied supervised and unsupervised learning techniques on real-world datasets.
  • Implemented model evaluation metrics (accuracy, precision, recall, F1-score) to optimize performance.
  • Collaborated in cross-functional teams to develop a capstone project with production-ready pipeline.
  • Deployed ML models using cloud services and REST API integration.
  • Practiced MLOps fundamentals including version control and experiment tracking.

Technical Skills

Languages

TypeScriptJavaScriptPythonSolidity

Frontend

Next.jsReactNode.jsTailwind CSS

Backend

PostgreSQLMySQLSupabaseREST APIGraphQL

Automation

n8nWorkflow DesignIntegration Pipelines

DevOps

DockerGitGitHub ActionsCI/CD

Web3

Web3.jsEthers.jsIPFSSoliditySmart Contracts

Tools

Socket.IOEChartsMapboxFigma

Education

Institut Teknologi Sumatera

Aug 2017 - Aug 2022

Bachelor of Electrical Engineering — GPA 3.50 / 4.00

Studied Electrical Engineering at Institut Teknologi Sumatera (ITERA), building a strong foundation in engineering principles, problem-solving, and analytical thinking. Served as a Teaching Assistant, guiding students during laboratory sessions and assisting lecturers with practical learning activities. This experience strengthened my communication, leadership, and teamwork skills in a technical environment.

SMK Negeri 2 Bandar Lampung

2013 - 2016

Networking and Computer Engineering

Configured and managed computer network infrastructures, including designing network topologies and implementing network services to support reliable connectivity. Installed and configured both Windows client and Linux Debian server operating systems, while performing network setup and troubleshooting. Deployed, configured, and tested server applications such as DNS Server, Web Server, and Web Mail to ensure stable and secure system operations.