Position: Middle+ Software Engineer - Java, scripting languages, back-end and mobile
Category: Java
English level: intermediate
Years of experience: 11

* restored / fixed an abandoned Python Slack application for one of my customers in 2020;

* significantly improved the quality of an Android mobile application (previous version of Centro-Mobile.org); my aim was to make this application more reliable for the end users (2014-2018); I am still supporting this customer;

 * participation in migration our Perl application to J2EE; I was an assistant for our project manager and I with the assistance of  our excellent RQL-Ukraine team calculated the realistic schedule for project in the crisis situation (milestones), so it pushed our customer to change the milestones to more realistic (2006, several months);

 * optimization of the shortest path algorithm (business processes) - on my own I've developed a new algorithm ("reinventing the wheel") that was significantly faster than existing recursion-based algorithm (before 2007);
Last years I've mostly participated in the back-end and mobile remote/freelance development (Android/Java, Android/Xamarin.Forms and C#, Ruby on Rails, Laravel/PHP, etc.), remote & part time.

Before that I've spent 4 years on Java desktop/back-end (J2EE) application in securities/investment area, remote & part time.

Approx. 17 years in the software development industry.

Main industries: Business process management, Investment portfolios management, Education.

Interesting: development of tools for developers.

Main skills: development of complex business logic, completing projects, significantly improving quality 
{I like when an app has no crashes, no data loss, and has UI that works for end users},
resolving end users' issues,
ability to work with very large and heterogeneous codebase.
I need: an interesting product that needs a creative mindset/R&D + complex logic (above average or high complexity preferred) + supporting juniors/beginners; this is will be the most effective variant.
Adequate work-life balance(!)

I don't want: gambling, cryptocurrency exchanges, social networks (with some exceptions), gaming (except medical projects), entertainment, etc.