Ivan

CONTACT INFORMATION:
Ivan Tsitserkyi
Kotlin & Java Engineer
LinkedIn:
http://[відкрити контакти](див. вище в блоці «контактна інформація»)
SUMMARY
tsitserskyi Versatile Software Engineer with an extensive and diverse skill set spanning GCP, Java/Kotlin, Spring
Boot, Rest API, SQL/NoSQL DB, Kotlin Multiplatform Mobile, and Jetpack Compose. Proficient in a wide
Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
array of programming languages, including Java, Kotlin, Python, and C#. Well-versed in frameworks and
E-mail: [відкрити контакти](див. вище в блоці «контактна інформація») libraries such as Spring, Hibernate, ASP.NET, Entity Framework, KTOR, KMP, Retrofit, Dagger, Apache
Spark, Coroutines, and many others, showcasing expertise in backend, mobile, and web development.
Telegram: @DVBLEX
Backend Kotlin/Java developer, designing API solutions for healthcare applications and implementing
Skype: Ivan Tsitserskyi efficient data processing using TimeScaleDB. Accomplished in both backend and Android development,
GitHub: github.com/DVBLEX contributing to Kotlin Multiplatform Mobile applications and Java/Kotlin desktop/web applications with
cloud platform integration and machine learning with Python and TensorFlow.
Location: Lviv, Ukraine
Proficiency in testing methodologies, including TestNG, JUnit, Mockito, and TDD. Adept at managing
databases such as SQL and No SQL. Open-source contributor on GitHub repositories.
HARD SKILLS: WORK EXPERIENCE
PROGRAMMING LANGUAGES / TECHNOLOGIES:
June 2023 – Present
• Kotlin
Back-end Kotlin Engineer, «Capgemini Engineering», Lviv, Ukraine
• Java 8,11,17,21
Customer: Health Care department in India.
• Spring, Spring Boot, Spring MVC, Spring Project description: A microservice system for India's busy healthcare industry that monitors large
Security, Spring Data JPA, Spring Cloud systems in clinics and hospitals and provides AI-powered assessments and advice.
Team: 50+ members in Dev Team, 10 members in QA Team, 5 DevOps, 3 Architects.
• Hibernate ORM, JDBC, Flyway
ACCOMPLISHMENTS:
• Apache Spark, Kafka - As a key developer, provided the full specter of solution for API on Spring Boot with PostgreSQL
• Android, KMP, Jetpack Compose on Kotlin for Health Care.
- Collaborated with cross-functional teams, including Product Owners, Frontend developers, and
• Python specialized integration teams to design and implement server communication protocols and
• C# ensure seamless team coordination.
- Created the solution using TimeScaleDB that helps increase data processing on the 10 time of
TOOLS: time and space 3 times complexity. Recreated and helped to find a solution for the problem of
removing loops that contain complex ices in business logic using Kafka , Keycloak and Fhir.
• Maven, Gradle
- Maintained full accountability for feature lifecycle management, from initial concept to
• Junit, Mockito, TestNG monitoring in a production environment, ensuring backward and forward compatibility in a
• Selenium IDE, Webdriver distributed system setting.
- Decoupled internal caches warming logic from primary DB by implementing the fetching of
appropriate configs from the configuration service connected to its private DB, which decreased
DATABASES:
the load on primary DB by 20%.
• MySQL, MSSQL, PostgreSQL
ENVIRONMENT:
• Firebase, MongoDB, Influx DB, TimeScaleDB Technologies: Kotlin, Java 21, Spring Boot 3.2.2, Spring 6+, Keycloak, FHiR, Retrofit, Kafka, JUnit,
Mockito, Jenkins.
INFRASTRUCTURE: Database: Oracle, PostgreSQL, TimeScaleDB
• GCP,AWS, Docker, Kubernetes Tools: Jira, GitLab, Confluence, IntelliJ IDEA, Checkstyle, Figma, Excel, Swagger.
• Jenkins, GitHub actions

COMMUNICATION / PROTOCOLS: JAN 2022 – MAY 2023
• HTTPS, WebSocket Back-end and Android Engineer, «Globallogic», Lviv, Ukraine
Customers: Healthcare and Telecom.
• REST, Webhook
Projects description: Developed application on Java/Kotlin - JavaFX/TornadoFX for
• gRPC, Protocol Buffers https://www.verizon.com/ and Kotlin Multiplatform Mobile application for healthcare department of
• Event-driven, messaging, asynchronous https://www.samsung.com/
Team: 5 members in Dev Team, 10 members in QA Team, 1 DevOps and in other project 5 members in
METHODOLOGIES: Dev Team and Engineering manager
ACCOMPLISHMENTS:
• Agile, Scrum, Kanban, extreme - The application was built with the latest Android guidelines used to have Jetpack Compose
programming components also Firebase components to manage DB and use Rest API for communicating with
• OOP, Functional programming other parts of the infrastructure.
- For the best product was used also Amazon S3 and GCP with ML and voice assistant inside.
• Test Driven Development, Domain Driven - Full stack development for desktop and web applications with testing and etc.
Design - Client-side communication and fast improvement of product.
- All cores and features were supported in Java and Kotlin.
REMOTE REPOSITORIES: ENVIRONMENT:
• Git (Bitbucket, GitHub, GitLab) Technologies: Kotlin, Java 17, Firebase, JavaFX, TornadoFX, Multiplatform Mobile, KTOR, KMM, Jetpack
• Jira, Confluence
Compose, Retrofit, Dagger, RXJava 2, Coroutines , Flow, AWS (S3, EC2, Lambda, ECS)
Database: PostgreSQL, Firebase
Tools: Jira, GitLab, Confluence, IntelliJ IDEA, Android Studio, Docker, AWS console, Amazon S3

ENGLISH: Intermediate (B1)
 APR 2021 – DEC 2021
Back-end Software Engineer, «Telclic Ireland», Lviv, Ukraine
EDUCATION: Customer: Business Information and CrowdFund.
Projects description: projects provide secure/scalable / highly available/solutions for cutting-edge
UNIVERSITY NULP (Lviv, Ukraine) capabilities to efficiently enrich, manage, and deliver content including enrichment and classification,
DEPARTMENT OF Software Engineering content management/processing / CrowdFund platform and BikeSharing
DEGREE IN Software Engineering (MS) Team: 7 members in Dev Team, 2 members in QA Team and PM
GRADUATION YEAR 2019 ACCOMPLISHMENTS:
- Developed several applications with Spring stack. My responsibilities were the MVC approach to
UNIVERSITY NULP (Lviv, Ukraine) build business logic and Rest-API for communicating with the front-end.
DEPARTMENT OF Software Engineering - I used to use different approaches for building apps like TDD and others. Also had different ways
DEGREE IN Software Engineering (BS) about projects like: from zero to hero and develop new features for a ready platform like this:
https://www.bikeshare.ie/
GRADUATION YEAR 2017 - Actively participated in Low-Level Design discussions, identifying potential issues, and
contributing innovative solutions to complex problems.
ENVIRONMENT:
Coursera Technologies: Java 11, Spring, Spring Boot, Maven, SQL, REST, Mockito, Tomcat, TypeScript, Angular CLI
SPECIALIZATION ML&AI - TensorFlow Database: PostgreSQL, MySQL
GRADUATION YEAR 2023 Tools: Jira, Git (Bitbucket), Confluence, SonarQube, IntelliJ IDEA, CheckStyle, Docker
GCP
SPECIALIZATION GCP skills JUL 2019 – MAR 2021
PERIOD JAN 2023 - present Big Data Java Developer, «BMW», Lviv, Ukraine
Customer: BMW automotive.
Bobocode Project description: Big data solution to sell and store for automotive and parts.
TRAINING PROGRAM Java Ultimate 3.0 Team: 10 developers Java, 10 developers Python, 5 QA, PM, 2 Architects, Product Manager.
PERIOD AUG 2023 – FEB 2024 ACCOMPLISHMENTS:
- Developed comprehensive reports and statistics for a hierarchical database relations model,
using SQL and Java to track key metrics like total assignments/questions completed, time spent,
MENTORING:
and grouping cases.
- Advanced my Java proficiency by creating practical scripts, such as one to copy assessments
Mastermind between Apache Spark and Spring.
APPLICATION Mastermind Application - Implemented tasks as part of a developer training program, which included developing new types
PERIOD FEB 2024 - present of questions, ensuring XSS validation, test coverage and technical debt decreasing.
- Addressed technical debt by refactoring complex code sections, improving their maintainability
and clarity, and contributing to the overall software quality.
- Researched and familiarized myself with the domains, codebase, and architecture.
ENVIRONMENT: Java 8, Apache Spark, Tomcat 8.5, MySQL , Git (Bitbucket), Scrum + Kanban (Jira
workflow).
PROJECTS:

Bibernate – custom ORM framework,
JAN 2019 – APR 2019
inspired by Hibernate.
The leading group of 5 professionals Software Engineer, «Glory to the Nation Foundation», Lviv, Ukraine
developers. Customer: Glory to the Nation Foundation.
Project description: system for share public data for procurement.
Bring – custom IoC and DI framework,
Team: one developer, PM.
inspired by Spring Core. ACCOMPLISHMENTS:
The leading group of 5 professionals - Managed forms on C# and connection with MSSQL database
developers. - Developed comprehensive reports and statistics for a hierarchical database relations model
Address Book Ktor – web application ENVIRONMENT: C# , MSSQL, WPF, Winforms, ASP.NET, Entity Framework , GitHub
where a user can manage an address
book. JUL 2018 – JAN 2019
Tables Hierarchy – tables hierarchy for
Software Engineer, «Estella», Lviv, Ukraine
simple usage like template.
Description: Development the application for furniture warehouse.
Team: one developer, PM, 1 manual QA
ACCOMPLISHMENTS:
Development applications: desktop version and web version
SOFT SKILLS: ENVIRONMENT: C# , MSSQL, WPF, Winforms, ASP.NET, Entity Framework , GitHub

• Lifelong Learning OCT 2018 – Present
• Leadership Freelance, Ukraine
• Ownership Description: providing freelance development services to clients: backend, android, database schema
• Troubleshooting designing, and data analysis, AI, ML, TensorFlow
ENVIRONMENT: Kotlin, Java 8,11,17,21, Python, Spring, AndroidSDK, Android-Webview , SQL, JDBC,
• Communication and negotiation
ADO.NET, ASP.NET, Entity Framework, Docker, TensorFlow.
• Quick adaptability
• Teamwork, organization
• Product-oriented mindset