BAC Romana
Every essay for the Romanian BAC exam — character analyses, literary movements and 500+ quizzes, with audio versions for better learning.
4.750K+ downloads
EducationLiteratureQuiz
Visit BAC RomanaFreelance Mobile App Developer & Consultant
RusuDinu-Ștefan
I design, build and scale mobile products — 50+ apps launched and used by more than 500,000 people.
50+
Apps launched
App Store & Play Store
500K+
Active users
across my applications
300+
Training hours
universities & companies
70M+
Views
on social platforms
As seen on
PRO TVEuronewsDevTalksDevConILikeITDoctor de Bine
Featured project
Food Scanner
Scan any food barcode and get clear, detailed nutritional information. AI-powered analysis that helps people make healthier choices every day.
Featured on PRO TV and Euronews Romania
300K+
installs
4.8
store rating
3×
national TV features
01
Selected projects
Mobile apps and websites helping over 500,000 users improve their daily lives.
Quizuri BAC Romana
Interactive quizzes covering the Romanian baccalaureate literature works — efficient prep for the exam.
4.420K+ downloads
EducationQuiz
Drivers Data
A virtual logbook for drivers. Routes, fuel consumption, maintenance and expenses with detailed analytics.
4.32K+ downloads
AutomotiveAnalytics
Visit Drivers Data
Comentarii BAC Audio
Audio commentary for BAC literature works, with detailed explanations and literary analyses for efficient preparation.
4.6200+ downloads
EducationAudio
Cosmin Savu
Personal website for the ProTV journalist, part of the "România, te iubesc!" team for over 19 years.
5.0Personal website
ConsultingWeb
02
Experience
Dell
Senior Engineer (Contractor)
Microservices and libraries with Kotlin and Spring Boot.
Wolt
Software Engineer
Product development with Kotlin and React.
Tazz by eMAG
Senior Software Engineer
Development and maintenance of the Tazz platform with Java Spring Boot and Angular.
Deutsche Bank Cloud School
Trainer
Training and mentoring students in cloud technologies and software development.
University POLITEHNICA of Bucharest
Teaching Assistant
Teaching assistant for programming and software engineering courses.
CodingShadows
Founder
Custom product development with Java, Flutter, Angular and React.
03
Media appearances
Latest appearance
Geografie BAC at ILikeIT
PRO TV, 2026
I presented Geografie BAC, the web platform and app students use to prepare for the Romanian geography baccalaureate. They practise directly on maps, exactly like in the exam, work through quizzes, simulate the full paper with automatic grading, and compete against each other in real time. Progress syncs between web and mobile, and all of it is free. Around 1,100 students used it ahead of this year's exam, just weeks after launch.
04
Conference talks
SpeakerDevTalks · Romania, 2026
592 Builds Later: Features That Survived (And The Ones That Didn't)
A brutally honest walkthrough of what actually happens when you iterate a mobile app in production — features that earned their place, ones that died with a 2-star review, and the feedback patterns that changed the product's direction entirely.
SpeakerDevTalks · Mobile Stage, 2025
Scaling Flutter to 100k MAU as a solo developer
The challenges of scaling a Flutter app past 100,000 monthly active users alone — practical strategies for cost management and performance when you're on your own.
SpeakerDevCon · Web & Mobile Con, 2025
Building for Fun, Scaling for Profit: Lessons from a Decade of Indie App Development
Indie app economics aren't taught in courses — you learn them from cloud bills and failed campaigns. A decade of experience distilled: real infrastructure costs, turning free users into assets, and why 'cheap' decisions end up the most expensive.
05
Background
Education
2024 – 2026
MSc Software Engineering
University POLITEHNICA of Bucharest
2020 – 2024
BSc Computer Engineering
University POLITEHNICA of Bucharest
2016 – 2020
Computer Science
Tudor Vianu National High School of Computer Science
Volunteering
2025
Romanian National AI Olympiad
Infrastructure & DevOps — Kubernetes, RabbitMQ, GitHub Actions
2021 – 2025
Hardcore Entrepreneur
Organizer, trainer and jury
2021 – 2022
InfoEducatie Olympiad
Jury member and mentor
Achievements
2022
1st place
Scientific Session, UPB
2021
2nd place
Scientific Session, UPB
2020
2nd place
National InfoEducatie
2020
3rd place
Online InfoEducatie
2019
Top 15%
National InfoEducatie
06
Publications
Decentralized Requirements Management in Software Engineering: Improving the Educational Processes by Leveraging Blockchain Based Technologies
Conference paper · March 2025 · 19th International Technology, Education and Development Conference
Facilitating Trust and Mobility in Education Using Microcredits and Verifiable Credentials with the Help of Distributed Ledger Systems
Conference paper · March 2025 · 19th International Technology, Education and Development Conference
LIFELINE — Emergency Patient Data in a Distributed Manner
Conference paper · October 2022 · IEEE SmartBlock4Health
Let's build something
Have a project idea or want to collaborate? Drop me an email and let's discuss.
I usually respond within 24 hours
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