PDF Toolkit

About the role

We are seeking a skilled developer to help enhance and maintain PDF Toolkit, an offline PDF editor, reader, and document scanner for Android. This all-in-one app allows users to merge, split, compress, sign, scan, OCR, and convert PDFs directly on their devices—without cloud uploads—ensuring complete privacy and local processing of sensitive documents.

Responsibilities

• Develop and maintain features for an offline PDF editor, including merging, splitting, compressing, and organizing PDFs.
• Implement document scanning and conversion tools (e.g., image to PDF, PDF to image, web to PDF).
• Integrate OCR functionality to extract text from scanned PDFs and images.
• Build annotation, signing, and protection tools (e.g., watermarks, password protection, metadata editing).
• Optimize app performance for smooth operation on older or low-end Android devices.
• Design and refine UI/UX with Material 3 standards, including dark mode support.
• Ensure all document processing remains 100% offline for privacy and security.

Requirements

• Experience developing Android applications with a focus on performance and offline functionality.
• Proficiency in PDF manipulation libraries (e.g., iText, PDFBox, or similar).
• Knowledge of OCR integration (e.g., Tesseract or ML Kit).
• Familiarity with document scanning and image processing (e.g., OpenCV, CameraX).
• Strong UI/UX skills, particularly with Material Design principles.
• Commitment to privacy-focused development (no cloud uploads, local processing only).

Benefits

• 100% offline functionality—no Wi-Fi required, works anytime, anywhere.
• Fast and smooth performance even on older or low-end Android devices.
• Clean Material 3 design with full dark mode support to reduce eye strain.
• Distraction-free interface with quick access to recent files.
• All-in-one tool for PDF editing, scanning, OCR, conversion, and file management.