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Sadewa Tedja

Hello, I'm

Sadewa Tedja

Informatics Engineering Student

Yogyakarta, Indonesia • UPN Veteran Yogyakarta

About Me

I'm an Informatics Engineering student at UPN Veteran Yogyakarta with a deep interest in building things that matter — from security-focused desktop apps to automated bots serving dozens of users.

My work spans full-stack development, IoT systems, and academic research on LLM reliability. I enjoy tackling hard problems, especially at the intersection of security, AI, and practical tooling.

Currently researching confabulation detection methods for large language models in Bahasa Indonesia, adapting semantic entropy approaches for low-resource evaluation contexts.

5+ Projects Shipped
39+ Active Users Served
2 Years Building

Education

Bachelor of Informatics Engineering (S1)

2023 — 2027

UPN Veteran Yogyakarta

  • Human-Computer Interaction
  • Cloud Computing Infrastructure
  • Software Quality
  • Scientific Writing Methodology

Experience

LLM Reliability Research

2024 — Present

Independent Academic Project — UPN Veteran Yogyakarta

  • Investigating confabulation detection methods for large language models in Bahasa Indonesia
  • Adapting semantic entropy methods using Indonesian NLI models for low-resource evaluation contexts
  • Evaluating reliability challenges of multilingual LLM deployment

Projects

CipherDrop

2025
PythonPySide6AES-256-GCMChaCha20FastAPI

Standalone E2EE desktop messaging and file sharing app for Windows with image steganography support.

  • AES-256-GCM file encryption, Vigenere+ChaCha20 hybrid messaging, Argon2id key derivation
  • Windows Hello biometric unlock integration
  • Self-hostable FastAPI backend with JWT auth and ephemeral/TTL messages

SPADA Attendance Bot

2024 — Present
PythonPlaywrightTelegramDiscord

Automated attendance system for UPN's Moodle-based LMS (SPADA).

  • Telegram and Discord notification systems for real-time alerts
  • Scaled to serve 39+ active users

Tracktard

2024 — 2025
React NativeExpoTypeScriptFirebaseIoT

Full-stack IoT monitoring app with React Native frontend and custom IoT backend for real-time sensor data tracking.

  • Modular TypeScript component architecture with Firebase integration
  • Offline handling and PWA support

Expense Tracker App

2024
FlutterSQLiteGemini Vision API

Cross-platform offline-first expense tracker with receipt scanning via Gemini Vision API.

  • Local data persistence with SQLite
  • State management via Provider

Full-Stack Notes App

2024
Vanilla JSExpress.jsMySQLGCP

Full-stack notes application with REST API backend deployed on Google Cloud Platform.

  • Authentication and CRUD operations
  • Cloud VM deployment on GCP

Technical Skills

Languages

PythonDartJavaScriptTypeScriptBash

Frameworks

FlutterReact NativeExpoFlaskExpress.jsFastAPIPlaywright

Databases

MySQLSQLiteFirebase

Cloud & DevOps

Google Cloud PlatformLinuxSSH

Security

AES-256-GCMChaCha20-Poly1305Argon2idJWT

Tools

GitVS Code

APIs & AI

Gemini APIOpenRouterAnthropic API

Organization

Member — MMC (Multimedia Community)

2023 — Present

UPN Veteran Yogyakarta

Active member of the campus multimedia and creative technology community.

Let's Connect

I'm always open to discussing new projects, research collaborations, or just having a chat about tech.