Сервис поиска работы №1 в Украине
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Андрій
Java Lead
Город проживания:
Киев
Готов работать:
Удаленно
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Andrii Volynets
Email: [открыть контакты ](см. выше в блоке «контактная информация»)
Phone: [открыть контакты ](см. выше в блоке «контактная информация») (WhatsApp, Viber, Telegram: @avolynets)
LinkedIn: [открыть контакты ](см. выше в блоке «контактная информация»)
Location: Spain (Ukrainian tax resident)
About Me
Senior Backend / Java Engineer with nearly 20 years of professional software development
experience. Experienced in leading product development from scratch, including
architecture design, development planning, team leadership, and production operations.
Strong background in high-load systems, distributed architectures, algorithms, and
mathematical problem-solving.
Key Skills
● Java (since 2006),
● Spring (Boot, MVC, WebFlux, JPA, Hibernate, Spring Cloud)
● Kafka, RabbitMQ, Redis
● Databases: PostgreSQL, Oracle (PL/SQL), MySQL, MongoDB, InfluxDB, TimescaleDB,
Elasticsearch
● Microservices, Distributed Systems, High-load Systems
● Experience in automated testing applicable for services (Junit/testing, Mockito +
Jmeter/Gatling.io)
● AWS (basic),
● Docker, Kubernetes
● Algorithms, Mathematics, Design Patterns
● Scala, Kotlin (basic)
● Machine Learning & Neural Networks (Python, TensorFlow, Keras, PyTorch) – basic
Work Experience
Team Lead / Senior Backend Engineer — CRM Platform
Startup (Sports Betting & Casino) | Jul 2024 – Feb 2026 | Remote
● Designed and built a CRM platform from scratch, including system architecture, data
models, and stack selection.
● Defined a phased development roadmap and led end-to-end microservices
implementation.
● Led team execution: task breakdown, code reviews, mentoring, and cross-team
collaboration.
● Integrated SMS and Email providers; owned production deployment, monitoring, and
incident handling.
● System live in production: ~100K messages/day, throughput capacity of several million
messages. supporting dynamic messaging workflows triggered by real-time user
activity.
Technologies: Java 21, SpringBoot 3, Kafka, PostgreSQL, Redis, Grafana, Prometheus,
Senior Java Developer — Atlaslive
Apr 2022 – Jul 2024 | Remote
● Maintained and evolved microservices for sports betting processing and risk
management.
● Optimized PostgreSQL queries, data flows, and algorithms for high-load services.
● Improved performance of critical processing scenarios by several times.
Technologies: Java 21, SpringBoot 3, rebbit, postgres, redis
Senior Java Developer — Perenio (IoT Cloud)
Oct 2020 – Apr 2022 | Remote
● Developed cloud backend for IoT Smart Home platform.
● Worked with time-series databases and monitoring systems.
● Integrated voice assistants and real-time data processing.
● Worked extensively with InfluxDB, focusing on time-series data modeling and storage
optimization.
● Designed and optimized data schemas to enable fast and efficient graph generation over
huge datasets.
● Improved query performance and data retrieval speed for analytics and monitoring use
cases.
●
Technologies: Spring 5, Spring Boot 2, Java 8, Scala, Kafka, Akka, MongoDB, Elastic,
Postgres, TimescaleDB, InfluxDB, Grafana, Prometheus, Google Voice Assistance,
Amazon Voice assistance, Kurento.
Senior Java Developer| Python ML — EduNav
Apr 2019 – Apr 2020 | Remote
● Developed backend services for personalized education planning.
● Implemented algorithms and formulas for study plan generation.
● Researched ML-based approaches for course planning.
Technologies: Java, Spring Boot, Python 3, keras, torch, pandas, tensorflow, scikit-learn
Senior Java Developer — Spotware
Jan 2018 – Mar 2019 | Cyprus (on-site)
● Developed backend services for the cTrader trading platform.
● Processed high-volume financial transactions via APIs.
Technologies: Spring 5, Spring Boot 2, Java 8, Netty server, protobuf, JSON, PostgreSQL
Senior Java Developer — InfoClinika
Jul 2017 – Nov 2017
● Developed a platform for storing and processing large scientific datasets (~40GB).
Technologies: Spring Cloud
Senior Java Developer — Nextiva
Dec 2016 – Jun 2017
● Worked on CRM calendar integration with Office365 and Google Calendar.
● Developed REST microservices and automated tests.
Technologies: Java, Spring Boot, SQL
Team Lead / Senior Java Developer — Playtech
May 2016 – Oct 2016
● Led team developing gambling games for mobile devices.
● Code reviews, estimations, sprint planning, and team management.
Technologies: Java,
Senior Java Developer — Luxoft (Citibank)
Aug 2015 – Apr 2016
● Developed internal web systems for Citibank.
● Worked directly with international customers.
Technologies: Java 8, vaadin
Senior Java Developer — WHIRL
Mar 2015 – Aug 2015
● Developed a high-load advertising system for Wi-Fi networks.
● Performance testing and architecture improvements.
Technologies: Java
Project Manager — Miratech
Apr 2013 – Dec 2014
● Managed multiple projects and teams (~18 people).
● Responsible for planning, budgeting, and customer communication.
Java Developer — Miratech
Dec 2010 – Apr 2013
● Developed CRM and telecom integration systems.
● Wrote automated tests and participated in estimations.
Project Manager / Java Developer — Web Studio
May 2008 – Dec 2010
● Developed Java - based web applications and managed projects.
Java Developer — UkrCard
Apr 2005 – May 2008
● Designed database architecture and Java applications for banking systems and ATM
Education
2000–2005 Kyiv National Taras Shevchenko University (Bachelor’s degree and Master’s
degree)
Faculty of Cybernetics
Specialization: Information Technology & Applied Mathematics
1997-2000 Physics-Mathematics Lyceum attached to Kyiv National Taras Shevchenko
University http://www.upml.univ.kiev.ua
Courses
Jan 2025 Laba : Investments in business
Jun 2019 Data Analysis: for beginners (http://edu4you.com.ua)
Sept 2013 MS Project and MS Project Server 2013
Nov 2011 TenStep Academy:
PM00.99: Preparation for PMP Certification Class PMBok
Nov 2006 SUN Educational Service in the Kvazar-Micro Education Center:
FJ-310: Developing Applications for the Java EE Platform
SL-314: Web component development with Servlet and JSP technologies
DWS-385: Developing Java Web Services
Awards
Several times won the regional competitions in mathematics and programming algorithms.
Languages
Ukrainian — Native | Russian — Fluent | English — Intermediate | Spanish — A1
Email: [
Phone: [
LinkedIn: [
Location: Spain (Ukrainian tax resident)
About Me
Senior Backend / Java Engineer with nearly 20 years of professional software development
experience. Experienced in leading product development from scratch, including
architecture design, development planning, team leadership, and production operations.
Strong background in high-load systems, distributed architectures, algorithms, and
mathematical problem-solving.
Key Skills
● Java (since 2006),
● Spring (Boot, MVC, WebFlux, JPA, Hibernate, Spring Cloud)
● Kafka, RabbitMQ, Redis
● Databases: PostgreSQL, Oracle (PL/SQL), MySQL, MongoDB, InfluxDB, TimescaleDB,
Elasticsearch
● Microservices, Distributed Systems, High-load Systems
● Experience in automated testing applicable for services (Junit/testing, Mockito +
Jmeter/Gatling.io)
● AWS (basic),
● Docker, Kubernetes
● Algorithms, Mathematics, Design Patterns
● Scala, Kotlin (basic)
● Machine Learning & Neural Networks (Python, TensorFlow, Keras, PyTorch) – basic
Work Experience
Team Lead / Senior Backend Engineer — CRM Platform
Startup (Sports Betting & Casino) | Jul 2024 – Feb 2026 | Remote
● Designed and built a CRM platform from scratch, including system architecture, data
models, and stack selection.
● Defined a phased development roadmap and led end-to-end microservices
implementation.
● Led team execution: task breakdown, code reviews, mentoring, and cross-team
collaboration.
● Integrated SMS and Email providers; owned production deployment, monitoring, and
incident handling.
● System live in production: ~100K messages/day, throughput capacity of several million
messages. supporting dynamic messaging workflows triggered by real-time user
activity.
Technologies: Java 21, SpringBoot 3, Kafka, PostgreSQL, Redis, Grafana, Prometheus,
Senior Java Developer — Atlaslive
Apr 2022 – Jul 2024 | Remote
● Maintained and evolved microservices for sports betting processing and risk
management.
● Optimized PostgreSQL queries, data flows, and algorithms for high-load services.
● Improved performance of critical processing scenarios by several times.
Technologies: Java 21, SpringBoot 3, rebbit, postgres, redis
Senior Java Developer — Perenio (IoT Cloud)
Oct 2020 – Apr 2022 | Remote
● Developed cloud backend for IoT Smart Home platform.
● Worked with time-series databases and monitoring systems.
● Integrated voice assistants and real-time data processing.
● Worked extensively with InfluxDB, focusing on time-series data modeling and storage
optimization.
● Designed and optimized data schemas to enable fast and efficient graph generation over
huge datasets.
● Improved query performance and data retrieval speed for analytics and monitoring use
cases.
●
Technologies: Spring 5, Spring Boot 2, Java 8, Scala, Kafka, Akka, MongoDB, Elastic,
Postgres, TimescaleDB, InfluxDB, Grafana, Prometheus, Google Voice Assistance,
Amazon Voice assistance, Kurento.
Senior Java Developer| Python ML — EduNav
Apr 2019 – Apr 2020 | Remote
● Developed backend services for personalized education planning.
● Implemented algorithms and formulas for study plan generation.
● Researched ML-based approaches for course planning.
Technologies: Java, Spring Boot, Python 3, keras, torch, pandas, tensorflow, scikit-learn
Senior Java Developer — Spotware
Jan 2018 – Mar 2019 | Cyprus (on-site)
● Developed backend services for the cTrader trading platform.
● Processed high-volume financial transactions via APIs.
Technologies: Spring 5, Spring Boot 2, Java 8, Netty server, protobuf, JSON, PostgreSQL
Senior Java Developer — InfoClinika
Jul 2017 – Nov 2017
● Developed a platform for storing and processing large scientific datasets (~40GB).
Technologies: Spring Cloud
Senior Java Developer — Nextiva
Dec 2016 – Jun 2017
● Worked on CRM calendar integration with Office365 and Google Calendar.
● Developed REST microservices and automated tests.
Technologies: Java, Spring Boot, SQL
Team Lead / Senior Java Developer — Playtech
May 2016 – Oct 2016
● Led team developing gambling games for mobile devices.
● Code reviews, estimations, sprint planning, and team management.
Technologies: Java,
Senior Java Developer — Luxoft (Citibank)
Aug 2015 – Apr 2016
● Developed internal web systems for Citibank.
● Worked directly with international customers.
Technologies: Java 8, vaadin
Senior Java Developer — WHIRL
Mar 2015 – Aug 2015
● Developed a high-load advertising system for Wi-Fi networks.
● Performance testing and architecture improvements.
Technologies: Java
Project Manager — Miratech
Apr 2013 – Dec 2014
● Managed multiple projects and teams (~18 people).
● Responsible for planning, budgeting, and customer communication.
Java Developer — Miratech
Dec 2010 – Apr 2013
● Developed CRM and telecom integration systems.
● Wrote automated tests and participated in estimations.
Project Manager / Java Developer — Web Studio
May 2008 – Dec 2010
● Developed Java - based web applications and managed projects.
Java Developer — UkrCard
Apr 2005 – May 2008
● Designed database architecture and Java applications for banking systems and ATM
Education
2000–2005 Kyiv National Taras Shevchenko University (Bachelor’s degree and Master’s
degree)
Faculty of Cybernetics
Specialization: Information Technology & Applied Mathematics
1997-2000 Physics-Mathematics Lyceum attached to Kyiv National Taras Shevchenko
University http://www.upml.univ.kiev.ua
Courses
Jan 2025 Laba : Investments in business
Jun 2019 Data Analysis: for beginners (http://edu4you.com.ua)
Sept 2013 MS Project and MS Project Server 2013
Nov 2011 TenStep Academy:
PM00.99: Preparation for PMP Certification Class PMBok
Nov 2006 SUN Educational Service in the Kvazar-Micro Education Center:
FJ-310: Developing Applications for the Java EE Platform
SL-314: Web component development with Servlet and JSP technologies
DWS-385: Developing Java Web Services
Awards
Several times won the regional competitions in mathematics and programming algorithms.
Languages
Ukrainian — Native | Russian — Fluent | English — Intermediate | Spanish — A1
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