Sergey K.
JavaEE/Spring/Android Developer
I have been dealing with web and mobile development for more than 5 years. Programming is my hobby and lifestyle. And I'm passionate about what I'm doing. I'm always eager to find out something new as this is what makes our life change as well as technologies that improve our lifestyle. This is what mostly fascinates me in my work. I specialize in Java/Spring and mobile for Android (using Java). Here are my main strengths: JAVA, J2EE, J2EE Design Patterns, Hibernate, Spring 4.0, Spring Boot, Spring MVC, Servlets, REST Web Services, JDBC. Android (Java), RxJava2 / RxAndroid, Flutter, Google API, REST API, Payment gateways (Stripe), JSON, SQLite, Material design, Crashlytics, Dependency injection (Dagger 2), Third-party libraries
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $23k
Billed in all: $326,594$327k
$23k in the last 6 months
Across 17 contracts
Earnings, last 30 days
Skill rankings: Top 3% in Spring MVC
Ranked by MRR among everyone on Upwork with the skill.
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- #7Spring MVC243 freelancers · 🇺🇦 #1Top 3%🇺🇦#1 of 6
- #15J2EE239 freelancers · 🇺🇦 #1Top 6%🇺🇦#1 of 8
- #37RESTful Architecture795 freelancers · 🇺🇦 #7Top 5%🇺🇦#7 of 102
- #66Spring Framework880 freelancers · 🇺🇦 #9Top 8%🇺🇦#9 of 79
- #151Android4,975 freelancers · 🇺🇦 #28Top 3%🇺🇦#28 of 371
- #232Android App Development6,395 freelancers · 🇺🇦 #29Top 4%🇺🇦#29 of 377
- #294Java8,313 freelancers · 🇺🇦 #28Top 4%🇺🇦#28 of 441