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Vlad
Java software engineer
- Considering positions:
- Java software engineer, Backend-програміст, Middle Java Developer, Software Engineer
- Age:
- 18 years
- City of residence:
- Bila Tserkva
- Ready to work:
- Kyiv
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Shtaiier Vladyslav Backend Engineer
CONTACT Phone: [open contact info ](look above in the "contact info" section) LinkedIn: Profile Link
Email: [open contact info ](look above in the "contact info" section) Telegram: t.me/shtaiier
SUMMARY I have 3+ years of hands-on experience turning hard problems into clear, reliable
solutions. I enjoy deep thinking, careful planning, and building systems that can grow
without breaking. My strong focus keeps complex projects on track, and I am ready to
give all my time and energy to the job. English - C1 written/spoken.
KEY Set up a Kafka cluster that streams ≈ at peak ~30k messages per second and cut
ACHIEVEMENTS cross-service latency by about 80 %.
Optimized key SQL queries, dropping average runtime from ~1.5 s to under 0.3s
and freeing roughly a third of database CPU.
Delivered asynchronous SSO with a fine-grained permission engine, sustaining 500
login requests per second at sub-70 ms P99 latency during peak loads.
TEHNICAL
SKILLS Backend: Java, Spring Boot, Spring Cloud, Spring Security, Hibernate.
Testing: TestContainers, Selenium, JUnit, Mockito, Embedded-Kafka.
Messaging & Async: Apache Kafka, WebSockets, Spring WebFlux, gRPC.
Monitoring: Spring Actuator, Grafana, Prometheus, Micrometer, Loki.
Databases: PostgreSQL, MongoDb, Redis, Spring Data, SQL, AWS S3.
Other: Maven/Gradle, Docker, OAuth2, Git, OIDC, Microservices.
PROFESSIONAL Backend Java Engineer | Dec 2024 - Jul 2025
EXPERIENCE Delasport, Bulgaria, Fintech
Developed mechanisms that greatly simplified test creation, substantially
accelerating overall development speed (internal testing lib + core mechanisms).
Championed an initiative to streamline the database architecture, significantly
reducing database load.
Initiated and led the split of a single monolithic database into separate active and
archival stores, boosting transaction-processing speed by almost 50%.
Optimized and researched much SQL query optimization solutions, leading up to
200% speed increase.
Fullstack Developer | Mar 2024 - Dec 2024
Information Computing Center, Ukraine, E-Learning & Administration
Created system architecture and data model design.
Lead a small team of Junior developers.
Created asynchronous authorization and authentication mechanisms with access
and refresh tokens.
Launched and implemented an initiative to create SSO mechanism for login.
Developed the core asynchronous engine that powers the platform’s learning
functionality.
Implemented security permissions engine with 86 permissions.
Established async backend communication on UI in React.
Backend Developer | Sep 2022 - Mar 2024
PNUdev, Ukraine, Science & HRMS
Created system architecture from ground up for all participated projects.
Established GitHub Actions CI/CD Pipelines.
Improved a lot of SQL queries up to 2000% speed increase (indexes, CTE, views).
Integrated external data sources for data import.
Wrote a lof of UI tests using Selenium.
Established testing convenntions and development guidelines.
Communicated with stakeholders for new releases functionality.
Setup metrics and analytics for viewing potential system weak points.
PET PROJECTS Quantum Craft
Automatic virtual computer assembling system
Built microservice architecture for data import and assembling processing.
Built NoSQL MongoDb data model.
Built data import core engine processing 150 components/minute.
Setup internal Apache Kafka infrastructure.
Quantum Craft Auth Engine
Custom asynchronous OAuth2 authorization server
Built asynchronous microservice for authorization and authentication.
Setup custom Spring Security OAuth2 authorization code grant type flow (PKCE).
Setup async security tests.
Setup 2FA via OTP.
Implemented OAuth2 Client with Google.
Quantum Craft Internal Testing Library
Selium utility data import and assembly testing library
Built internal testing library for simplifying testing.
Setup test cases and test conventions for automated UI testing.
Created utility TestContainer classes for better testing convenience.
Setup data generation mechanism for faster tests development.
EDUCATION Taras Shevchenko National University of Kyiv
Bachelor in Computer Engineering (2024 - 2028)
VmWare Srping Professional Cerificate Preparation
CONTACT Phone: [
Email: [
SUMMARY I have 3+ years of hands-on experience turning hard problems into clear, reliable
solutions. I enjoy deep thinking, careful planning, and building systems that can grow
without breaking. My strong focus keeps complex projects on track, and I am ready to
give all my time and energy to the job. English - C1 written/spoken.
KEY Set up a Kafka cluster that streams ≈ at peak ~30k messages per second and cut
ACHIEVEMENTS cross-service latency by about 80 %.
Optimized key SQL queries, dropping average runtime from ~1.5 s to under 0.3s
and freeing roughly a third of database CPU.
Delivered asynchronous SSO with a fine-grained permission engine, sustaining 500
login requests per second at sub-70 ms P99 latency during peak loads.
TEHNICAL
SKILLS Backend: Java, Spring Boot, Spring Cloud, Spring Security, Hibernate.
Testing: TestContainers, Selenium, JUnit, Mockito, Embedded-Kafka.
Messaging & Async: Apache Kafka, WebSockets, Spring WebFlux, gRPC.
Monitoring: Spring Actuator, Grafana, Prometheus, Micrometer, Loki.
Databases: PostgreSQL, MongoDb, Redis, Spring Data, SQL, AWS S3.
Other: Maven/Gradle, Docker, OAuth2, Git, OIDC, Microservices.
PROFESSIONAL Backend Java Engineer | Dec 2024 - Jul 2025
EXPERIENCE Delasport, Bulgaria, Fintech
Developed mechanisms that greatly simplified test creation, substantially
accelerating overall development speed (internal testing lib + core mechanisms).
Championed an initiative to streamline the database architecture, significantly
reducing database load.
Initiated and led the split of a single monolithic database into separate active and
archival stores, boosting transaction-processing speed by almost 50%.
Optimized and researched much SQL query optimization solutions, leading up to
200% speed increase.
Fullstack Developer | Mar 2024 - Dec 2024
Information Computing Center, Ukraine, E-Learning & Administration
Created system architecture and data model design.
Lead a small team of Junior developers.
Created asynchronous authorization and authentication mechanisms with access
and refresh tokens.
Launched and implemented an initiative to create SSO mechanism for login.
Developed the core asynchronous engine that powers the platform’s learning
functionality.
Implemented security permissions engine with 86 permissions.
Established async backend communication on UI in React.
Backend Developer | Sep 2022 - Mar 2024
PNUdev, Ukraine, Science & HRMS
Created system architecture from ground up for all participated projects.
Established GitHub Actions CI/CD Pipelines.
Improved a lot of SQL queries up to 2000% speed increase (indexes, CTE, views).
Integrated external data sources for data import.
Wrote a lof of UI tests using Selenium.
Established testing convenntions and development guidelines.
Communicated with stakeholders for new releases functionality.
Setup metrics and analytics for viewing potential system weak points.
PET PROJECTS Quantum Craft
Automatic virtual computer assembling system
Built microservice architecture for data import and assembling processing.
Built NoSQL MongoDb data model.
Built data import core engine processing 150 components/minute.
Setup internal Apache Kafka infrastructure.
Quantum Craft Auth Engine
Custom asynchronous OAuth2 authorization server
Built asynchronous microservice for authorization and authentication.
Setup custom Spring Security OAuth2 authorization code grant type flow (PKCE).
Setup async security tests.
Setup 2FA via OTP.
Implemented OAuth2 Client with Google.
Quantum Craft Internal Testing Library
Selium utility data import and assembly testing library
Built internal testing library for simplifying testing.
Setup test cases and test conventions for automated UI testing.
Created utility TestContainer classes for better testing convenience.
Setup data generation mechanism for faster tests development.
EDUCATION Taras Shevchenko National University of Kyiv
Bachelor in Computer Engineering (2024 - 2028)
VmWare Srping Professional Cerificate Preparation
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The candidate's resume is posted at https://www.work.ua/resumes/14151304/