Available for engineering opportunities

Software Engineer
crafting scalable mobile
and backend systems.

I'm Karim El Yaagoubi, a Software Engineer who turns complex ideas into reliable products across Flutter, Spring Boot, C, and cloud technologies. I've shipped a production mobile app with 10,000+ downloads, served 70+ paid users, and built open-source developer tools and semantic data systems used by the community.

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4+Production projects
10K+App downloads shipped
OCPJava SE 17 certified

About

I'm a systems-oriented backend engineer with 3+ years of experience building high-performance mobile apps, APIs, and developer tooling.

Mobile Engineering Backend & APIs Semantic Web System Design Open Source

Selected Projects

2026 — Present Latest Open Source

Goldfinch — Native RDF Triplestore

A native RDF triplestore built in C for efficient storage and querying of semantic data. The project explores low-level systems programming and practical RDF infrastructure from the ground up.

C
RDF
Triplestore
Systems Programming

Feb 2026 — Present

Semantic Modeling & Analytics of Cancer Data

End-to-end Semantic Web pipeline for breast cancer analytics. Designed an OWL ontology, transformed structured CSV datasets to RDF, ran advanced SPARQL queries with triplestore benchmarking, and deployed an interactive cloud dashboard for biomedical analysis.

Python
RDF
SPARQL
OWL
Cloud

Aug 2025 Live · Google Play

Audio Tag Editor

Production-ready Flutter mobile app for editing audio metadata. Integrated a custom Flutter plugin with native Android (Java) for efficient file processing. Implemented BLoC for scalable state management.

10,000+ downloads · 70+ paid users · real revenue on Google Play.

Flutter
BLoC
Android
Java

Jul 2025 Open Source · pub.dev

flutter_audio_tagger

Open-source Flutter plugin for reading and editing audio file metadata (ID3 tags) on Android. It reads tag data from audio files and returns edited files as raw bytes (Uint8List), giving apps full control over where and how the resulting file is saved.

100-200 weekly downloads on pub.dev.

Dart
Java
Method Channels
Plugin

May 2025

CourierFlow

Flutter delivery management app integrated with a Spring Boot backend using GraphHopper for route optimization. JWT-based authentication secures communication between client and server, enabling efficient route planning.

Flutter
Spring Boot
GraphHopper
JWT

Skills & Stack

Languages

Java
Dart
C
Python
PL/SQL

Mobile

Flutter
BLoC
Native Android
Method Channels

Backend

Spring Boot
REST APIs
JWT
SQL

Data & Semantic Web

SPARQL
RDF
OWL
Knowledge Graphs
Triplestores

Systems

C
Memory Management
Data Structures
Performance

Core

Data Structures
Algorithms
Object-Oriented Design
System Design

Certifications

Oracle Certified Professional — Java SE 17 Developer

Experience

Astound Technology
Jul 2026 - Oct 2026 | Casablanca

Backend Software Engineer Intern
- Developed RESTful APIs with Spring Boot using layered architecture and clean coding practices.
- Designed and implemented data models with MongoDB and PostgreSQL.
- Integrated authentication and authorization with Keycloak, JWT, and role-based access control.
- Integrated backend APIs with Next.js applications.
- Used Git for version control and participated in code reviews.

Education

National School of Applied Sciences
Oujda, Morocco

Engineering degree — Data Science & Cloud Computing
Classes Préparatoires aux Grandes Écoles (CPGE)
Oujda, Morocco

Technology and Industrial Science — intensive math, physics, and engineering preparation.