Zakhar Kostyshyn
Java Kotlin Developer at Sombra
Ivano-Frankivsk Oblast, Ukraine
Summary
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Senior🎓
Top SchoolZakhar Kostyshyn is a Java/Kotlin developer with eight years of professional experience and over four years focused on building scalable, high-performance backend systems using Spring Boot, Spring Security, and Spring Data. Based in Ivano-Frankivsk, Ukraine, he combines practical expertise with relational databases (MySQL, PostgreSQL) and AWS to deliver secure, production-ready services, including Stripe payment integrations and Salesforce CRM optimizations. Beyond backend engineering, Zakhar is deeply invested in cybersecurity—holding eJPTv2, CPTS, and OSCP certifications—and regularly hones his skills through security research, CTFs, and lab challenges. He has been contributing to business-critical projects at Sombra since 2020, blending attention to detail with a collaborative team mindset. Always curious, he pursues new technologies and security techniques that improve reliability and resilience in distributed systems.
8 years of coding experience
Master's degree, Computer Science, Master's degree, Computer Science at Vasyl Stefanyk Precarpathian National University
Stackoverflow
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Programming languages (3)
Github contributions (5)
zakhar-kostyshyn/course_management_system
Feb 2022 - Sep 2022
Contributions:13 PRs, 86 pushes, 12 branches in 7 months
kykyrudzanePole/CourerSystem
Jul 2018 - Jul 2018
Contributions:16 commits, 13 pushes, 2 branches in 3 days
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