Marjuk Amin
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Marjuk Amin

Bangladesh

Software Developer · Full-Stack Web Developer · App Developer

marjukamin06@gmail.com·marjukamin.com·github.com/marjuk06·linkedin.com/in/marjukamin

Executive Summary

Software Developer specializing in local-first desktop software, Android mobile systems, and scalable full-stack web applications. Proven track record of designing cryptographic desktop solutions (CN Vault), offline-first Android apps (EAP Tracker), and automated developer productivity utilities. Strong advocate for data privacy, offline autonomy, and high-performance interfaces.

Core Competencies

Programming Languages

Kotlin · TypeScript · JavaScript · Python · SQL

Mobile & Platforms

Android Native · Jetpack Compose · Coroutines & Flow · Room DB · WorkManager · Desktop JVM · Linux Environments

Web & Frontend

Next.js (App Router) · React · Tailwind CSS · Semantic HTML5 · Responsive UI/UX · State Management

Architecture & Security

Local-First Architecture · Cryptographic Implementations (AES-256-GCM, Argon2id) · Zero-Knowledge Data Design · Offline-First Synchronization · REST APIs · Git Version Control

Engineering Projects & Systems

CN Vault — Local-First Password Manager

2024 - Present

Role: Lead Architect & Developer

  • Architected an offline-first credential vault ensuring zero plaintext persistence and zero external network calls.
  • Implemented Argon2id memory-hard key derivation to resist GPU brute-force attacks.
  • Engineered AES-256-GCM authenticated encryption with volatile memory sanitization to prevent process memory scraping.
  • Delivered sub-50ms vault unlocking and instantaneous in-memory record search.
KotlinDesktopSecurityArgon2idAES-256-GCM

EAP Tracker — Engineering Admission Prep System

2024

Role: Mobile Engineer & Architect

  • Built a production Android application empowering students to systematically track chapter mastery and revision cadences.
  • Implemented an offline-first architecture utilizing Android Room SQLite as the single source of truth.
  • Integrated Android WorkManager for deferred cloud synchronization with custom conflict resolution logic.
  • Maintained 100% crash-free sessions across tracked engineering preparation sprints.
AndroidKotlinRoom DBWorkManagerFirebase

CN File Organizer — Automated Workspace Productivity

2025 - Present

Role: Creator & Developer

  • Developed an automated desktop organization tool with background directory monitoring and transactional rollback logs.
  • Implemented progressive chunked SHA-256 hashing to reliably detect duplicate multi-gigabyte media files without memory overload.
  • Constructed a rule-based regex classification engine for sorting chaotic download directories.
KotlinDesktopSHA-256LinuxFile Systems

CN Question Extractor — Academic Parsing Engine

2024 - 2025

Role: Lead Developer

  • Engineered an automated parsing engine transforming unstructured academic exam documents into standardized JSON databases.
  • Accelerated question ingestion pipelines by over 10x compared to manual transcription methods.
  • Achieved a 98.4% extraction accuracy across over 15,000 structured questions.
PythonRegex State MachinesJSON SchemaAutomation

Education & Academic Focus

Computer Science & Engineering Studies

2022 - Present

Higher Secondary & Engineering Preparation

Focus on Algorithms, Data Structures, Mobile Systems, and Cryptographic Security.