Jacek Janur
Mobile Apps with awareness
"Zanshin is the state of total awareness. It means being aware of one's surroundings and enemy, as well as being prepared to react." - Takuan Sōhō
ABOUT
I'm a mobile developer who believes in staying aware of the bigger picture. My approach is inspired by zanshin (残心) - maintaining focus not just during work, but after. It's about writing code that I can stand behind tomorrow, next month, and next year.
Over 3+ years in software development, I've learned that good code comes from understanding what happens after you ship. Whether it's a mobile app with thousands of users or an MVP testing a new idea, I care about how it performs in the real world and how it can adapt to change.
FEATURED WORK
Trawell
Travel City Game
A mobile city-game app I co-founded that turns exploring local landmarks into interactive challenges. From initial concept to 1,500+ downloads, I handled everything - UI/UX design, Flutter development, Django backend, and learning what users actually need.
EXPERIENCE
Deployed
Mobile Developer | July 2024 - Present
Building native Android apps and maintaining React Native codebases. I work directly with clients to understand what they need, then turn those ideas into working software. From Bluetooth integration to bug tracking, I handle projects from start to finish.
Allventures
Co-Founder & Lead Mobile Developer | May 2022 - Present
Co-founded Trawell, a mobile app that's reached 1,800+ downloads with a 4.6/5 rating. I designed the UI/UX, built the backend API, and learned a lot about what users actually want by listening to their feedback. Turns out, talking to people is as important as writing code.
See projectTech in Shot PSA
Flutter Developer | November 2022 - June 2024
Developed mobile and desktop applications with Flutter. Built payment systems, booking features, and helped validate business ideas through rapid MVP development. Got to see firsthand how different approaches work in the real world.
SKILLS
Mobile Development
Flutter, Dart, React Native, Kotlin, Jetpack Compose, Android native development
Backend & Tools
Django, PostgreSQL, REST APIs, Laravel, PHP, MySQL, Figma, Stripe integration
Business & Collaboration
Requirements gathering, Client communication, Technical documentation, Bug tracking & prioritization, User feedback analysis, Product roadmap planning