Rusu Dinu-Ștefan

Senior Software EngineerFounder of CodingShadows

I build products people use, from the app to the servers behind it.

Mobile apps, AI features and the Go and Kubernetes platform behind them: 50+ apps launched, used by more than 500,000 people.

  • 50+Apps launched
  • 500K+Users
  • 300+Training hours
  • 70M+Views
  • As seen on PRO TV · Euronews

What I build

Five things, usually in the same project.

End-to-end products

One owner from the first idea to the store listing, and through the years of releases after it. The other four are its parts.

Hiring for a project? The studio takes it from here.CodingShadows

Selected work

BioBrief

Photograph the ingredient list on a package and get a health score with additive and allergen warnings in seconds; a barcode works too. Geneva, the AI nutritionist, answers follow-up questions. Six languages, now also in the US.

Platforms
Android, iOS
App
Flutter
Backend
Go on PostgreSQL
Languages
Six, in the US since 2026
  • 300K+

    installs

  • 4.8

    store rating

  • 3×

    national TV features

Featured on PRO TV and Euronews Romania

Simulează

One account for Bacalaureat prep across 13 subjects: lessons, quizzes, flashcards and timed simulations graded against the official marking scheme, with an AI tutor and a readiness score. No ads.

Platforms
Web, Android, iOS
Apps
Kotlin Multiplatform
Backend
Go
Coverage
13 exam subjects
  1. Simulează home screen
    01 / 03 · HomeThe whole exam in one placeHome puts full timed papers, your subjects and a daily ten-question test on one screen.
  2. Simulează quiz screen with a biology question
    02 / 03 · QuizPractice in short loopsTen questions per quiz and one tap to check. Mistakes get their own tab, so the next session starts from them.
  3. Simulează map lesson with the counties of Romania
    03 / 03 · MapLessons you can tapGeography is learned on the map: tap a county to study it, then switch to test mode.

Geografie BAC

Geography Bacalaureat prep on the map: click-on-the-map exercises, official past papers with AI grading of open answers, even from a photo of handwriting, and real-time duels.

Platforms
Web, Android, iOS
Apps
Kotlin Multiplatform
Backend
Go
First season
About 1,100 students before the 2026 exam
  1. Geografie BAC map lesson with the countries of Europe
  2. Geografie BAC instant grading for an exam question
  3. Geografie BAC duel setup screen

BAC Română

Essays, character analyses and literary movements for the Romanian Baccalaureate, now native on Android and iOS and on the web. The family includes Quizuri BAC Română, free with a weekly national contest, and Comentarii BAC Audio.

Platforms
Web, Android, iOS
Apps
Kotlin Multiplatform, Compose and SwiftUI
Backend
Go, shared by three apps
Reach
50K+ downloads, rated 4.7
  1. BAC Română library of literary works
  2. BAC Română short outline of a poem

Drivers Data

A work logbook for professional bus and transport drivers: shifts, hours, routes, km and fuel, with monthly PDF and Excel reports to check against the official timesheet.

Platforms
Android, iOS, web
App
Flutter
In production
Since 2019
Reach
2K+ downloads, rated 4.9
  1. Drivers Data form for adding a working day
  2. Drivers Data summary of one working day
  3. Drivers Data monthly report

More work

Other studio products, an open-source tool and client work.

  • La Liceu

    Evaluarea Națională prep in Romanian and maths: lessons, exam-format simulations graded against the marking scheme and an admission-average prediction. Its sister site, medieadmitere.ro, is a free admission calculator.

    Web app

  • Presence

    Pixel-art attendance for classrooms: students join from a shared link and their avatars walk into the room, while the teacher grades attendance from a phone.

    Web app

  • Orbit MCP

    A free macOS menu-bar app that runs a local MCP server, so AI assistants can work with Apple Notes, Reminders and Calendar.

    Open source

  • Cosmin Savu

    Personal website for the investigative journalist, part of PRO TV's "România, te iubesc!" team.

    Client work

Rusu Dinu-Ștefan presenting his apps on television

Speaking and media

On stage and on air.

Conference talks

DevCon, Web & Mobile Con, 2025

DevCon · Web & Mobile Con, 2025

Building for Fun, Scaling for Profit: Lessons from a Decade of Indie App Development

Media appearances

  • Geografie BAC at ILikeIT

    Latest appearance

    Geografie BAC at ILikeIT

    PRO TV, 2026

    Read the PRO TV story
  • ONIA at ILikeIT (Monday)

    ONIA at ILikeIT (Monday)

    PRO TV, 2026

  • ONIA at ILikeIT (Sunday)

    ONIA at ILikeIT (Sunday)

    PRO TV, 2026

  • BioBrief at Doctor de Bine

    BioBrief at Doctor de Bine

    PRO TV, 2025

  • BioBrief at ILikeIT

    BioBrief at ILikeIT

    PRO TV, 2024

  • BioBrief at Euronews

    BioBrief at Euronews

    Euronews Romania, 2024

  • Lifeline at ILikeIT

    Lifeline at ILikeIT

    PRO TV, 2022

  • Drivers Data at ILikeIT

    Drivers Data at ILikeIT

    PRO TV, 2019

See all talks and appearances

Experience

Résumé (PDF)
  • 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

    A studio shipping its own apps, including the exam-prep suite, a food scanner and a logbook for professional drivers, built with Kotlin Multiplatform, Go and Kubernetes.

  • Romanian National AI Olympiad

    Co-founder

    Co-founded the olympiad and built the platform behind it: infrastructure and DevOps on Kubernetes, RabbitMQ and GitHub Actions.

Education, volunteering, awards and publications

Education

  • 2026 – present

    PhD

    University POLITEHNICA of Bucharest

    Thesis: Reliability, Observability and Harness Engineering for Autonomous Software Engineering Agents

  • 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

  • 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

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

See what CodingShadows builds: apps, AI, web and infrastructure