Olena

Olena Zakamarko
Java Developer
[відкрити контакти](див. вище в блоці «контактна інформація»)
14/03/1999

Professional summary
Java Software Engineer with 5 years of professional experience in designing, developing,
and maintaining Java enterprise applications and APIs. Strong experience with Java and
building scalable, reliable software solutions. Comfortable working in Agile teams,
collaborating within distributed international teams, and taking ownership of tasks
throughout the development lifecycle. Focused on writing clean, maintainable code, solving
technical problems, and delivering high-quality solutions.

Skills & Abilities
Programming languages Technologies/Databases
Java MySQL
Javascript Oracle DB
Kotlin basics PostgreSQL
Frameworks/Libraries Others
Spring Boot Docker
Hibernate Jenkins
Spring Data Camunda
Thymeleaf Open API
JQuery Red Hat OpenShift
JUnit HTML
Mockito CSS
Spring LDAP REST API
React.js UML diagrams
Bootstrap Jira
Spring Security Gitlab
Spring Actuator Bitbucket
Spring MVC
Liquibase
Project Lombok

Education
Ternopil State 'Ivan Pul'uj' Technical University, Bachelor's degree, Software Engineering
2017 - 2021
Ternopil State 'Ivan Pul'uj' Technical University, Master's degree, Software Engineering
2021 - 2022

Languages
English - Upper-intermediate

Project Experience

Java Developer
Vodacom (South Africa) / 3,8 years
An enterprise-grade ecosystem consisting of secure web applications, administrative
portals, microservices. The suite provides centralized user identity lookup, automated
access control, LDAP directory management, digital workflow integrations for
authentication exemptions, operational health monitoring: - Identity360 (I360) (Built
from scratch, maintained) Enterprise Identity & Access Management system designed
for real-time identity search, profile administration, and directory management across
diverse environments. It connects 15+ integrated services—including 5 LDAP directories,
4 databases, and custom Kotlin modules—allowing authorized users to search, modify,
and manage identity records within a single interface. It enforces strict data access
controls through OAuth 2.0, OpenID Connect, NetIQ Access Manager protocols. - LDAP
Hub (Built from scratch, maintained) An administrative web application developed to
replace a legacy service, enabling support staff to securely manage password changes
for LDAP service accounts. - IAM Insight (Built from scratch, maintained) A central
operational health monitoring web application designed to evaluate service status,
operational metrics, uptime across internal applications. - CRM Access API (Built from
scratch, maintained) A REST microservice that evaluates user access rights against
defined CRM resources, returning precise permission lists for authorized users. - LDAP
Attribute Modifier API (Built from scratch, maintained) A REST microservice created to
perform controlled updates of LDAP attributes within identity vaults. - Fingerprint
Exemption API (Built from scratch, maintained) A REST microservice exposed to digital
workflow engines to automate fingerprint authentication exemptions upon approval. -
AAF Enrolment Retrieval API (Built from scratch, maintained) A REST microservice that
retrieves user enrolment status directly from AAF, verifying TOTP setup before granting
authentication exemptions. - Unity (Feature development) An enterprise application

allowing line managers to manage users with multiple identities across systems. - DMS
(Feature development) An automated account governance system used to detect
dormant user accounts, executing policy actions upon them.

- Java 17 - Spring Boot 3.5.14
- Kotlin basics - Spring Security
- Spring LDAP - OAuth 2.0
- OpenID Connect - React.js
- JavaScript - jQuery
- Thymeleaf - HTML
- CSS - Bootstrap 5
- Oracle DB - Red Hat OpenShift
- NetIQ Access Manager - Sentinel (Transaction Monitoring)
- Hibernate - OpenAPI (Swagger)
- UML diagrams - Spring Actuator
- Maven - Gitlab
- Jira

- Designed, developed, and deployed enterprise applications and microservices from
scratch using Java Spring Boot and Red Hat OpenShift.

- Implemented robust security mechanisms using Spring Security, OAuth 2.0, OpenID
Connect, and Spring LDAP for strict access control and identity management.

- Built high-performance REST APIs enabling third-party and workflow system
integrations for automated user provisioning and MFA exemptions.

- Contributed new backend and frontend features to existing legacy systems, migrating
outdated dependencies and refactoring codebase for reliability.

- Maintained continuous operational stability for all applications through health and
transaction monitoring via Sentinel and custom tools.

- Regularly upgraded application frameworks, dependencies, and APIs to resolve security
vulnerabilities and meet compliance standards.

- Designed UML diagrams to map out web application architecture and authored
detailed technical documentation for ongoing maintenance.

Java Developer

Popsicle (USA) / 1 month
Popsicle is an educational management application designed for schools and parents.
The platform streamlines student enrollment in extracurricular activities, seasonal
camps, and aftercare programs, allowing parents to easily register and pay for events
while enabling schools to set up classes, track participation, and manage financial
reporting within a single ecosystem.

- Spring Boot - Spring Security
- Spring Data - Hibernate
- Spring MVC - Docker
- Maven - REST API
- Jenkins - MySQL
- Jira - Git
- Bitbucket - Stripe

- Investigated, debugged, and resolved complex backend issues to ensure platform
stability and correct system behavior.

- Performed database analysis and executed data fixes/adjustments to maintain data
consistency and integrity.

- Executed functional testing for existing features and API endpoints to identify edge
cases and technical flaws.

- Assisted management with project progress tracking, feature evaluation, and preparing
technical status updates.

Java Developer
Capbpm (USA) / 9 months
Capbpm is an e-commerce platform for trading industrial machinery, spare parts, and
mechanical components. The platform enables real-time negotiation, price discussions,
and interactive custom order processing between buyers and sellers.

- Spring Framework - Hibernate
- Flyway - Camunda
- Git - GitHub
- GitLab - Jira
- JUnit - Mockito
- AWS SQS - AWS SNS
- Docker - Linux

- Virtual Machine - Jenkins
- Gradle - Kafka
- RabbitMQ - AWS CLI
- Agile - Git flow

- Analyzed business requirement specifications and identified core problem statements
to design scalable solutions.

- Implemented, tested, and documented robust REST APIs across multiple backend
microservices.

- Wrote unit tests to ensure high code coverage, system stability, and reliable
performance.

- Resolved complex technical issues, fixed bugs, and performed code refactoring.

- Adhered strictly to company coding standards, architecture patterns, and technical
documentation guidelines.

- Collaborated closely with cross-functional team members and actively participated in
daily meetings.

Java Developer
Inventorsoft Portal (Ukraine) / 5 months
Inventorsoft Portal is an internal management system designed to automate core
business processes within an IT development agency. The platform streamlines vacancy
and candidate tracking, employee management, project oversight, invoicing, and
administrative workflows through a centralized web interface.

- Spring Boot - Hibernate
- Spring MVC - Spring Data
- Maven - REST API
- Project Lombok - Liquibase
- Javascript - HTML
- CSS - PostgreSQL
- Thymeleaf - JQuery
- Ajax - Bootstrap
- Gradle

- Developed and maintained RESTful APIs and responsive UI components.

- Analyzed, debugged, and resolved complex issues across both frontend and backend
architectures.

- Collaborated with the team to implement new features and improve overall system
reliability.

Hobby
- Reading books on human behavior, personal growth, and software engineering trends. -
Swimming and regular fitness training for physical wellness.