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[открыть контакты](см. выше в блоке «контактная информация») NAZAR YASKAL
[открыть контакты](см. выше в блоке «контактная информация») SENIOR JAVA
Kyiv, Ukraine
SOFTWARE ENGINEER

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LEAD SOFTWARE ENGINEER
Ragnarök Group 08/2025 - present
SKILLS
Project description:
Payment platform. Migrating an existing system to another cloud
Java 8-21, Kotlin
and adapting its architecture.
Spring boot, Ktor
Responsibilities:
Rest API, Microservices, SOAP
Analyzing and defining required architectural changes.
GCP: SDK, Console, KMS, PubSub
Leading the migration process: task planning and distribution,
ETL: Apache Beam, Dataflow
guiding developers, troubleshooting complex cases, and
AWS: API Gateway,
providing technical support.
CloudFormation, Cognito, ECS,
Transforming the system from an internal solution into an
Lambda, CloudWatch
external B2B-ready platform. Implemented an API Gateway,
JUnit, Mockito
strengthened security layers, added missing validation, and
NoSQL, Firestore
created customer-facing documentation.
SQL, PostgreSQL, BigQuery
Apigee Edge, Apigee X
SENIOR SOFTWARE ENGINEER
Mulesoft
Ragnarök Group 07/2024 - 08/2025
Project description:
EDUCATION
Digital insurance platform. Spring Statemachine service that

MASTER IN ANALYTICAL handles claims exchange between systems.

METHODS OF INFORMATION Responsibilities:
SECURITY Creating tasks and distributing them between developers.
Support for other team members.
Institute of Physics and Technology,
Implemented clean code practices, automatic code quality
NTUU “Igor Sikorsky Kyiv Polytechnic
checks, and code review.
Institute”
Service coverage with tests: raised the % of code coverage by
2015 - 2021 unit tests from 40 to 90. Introduced service coverage with
component tests.
Participation in the discussion of technical solutions.

LANGUAGES Business logic development, bug fixing.

SENIOR SOFTWARE ENGINEER
Native: Ukrainian
Upper-Intermediate: English Ragnarök Group 05/2024 - 07/2024
Project description:
RESTful payment platform. This is a distributed system consisting
of a dozen Java microservices and serverless AWS Lambda.
CERTIFICATES Responsibilities:
Reverse engineering, code investigation. Creating flow
GCP Associate Cloud Engineer diagrams and infrastructure requirements based on existing
code.
AWS Certified Developer –
Code migration, local build of services. Migration from Gradle to
Associate
Maven. Java version upgrade from 8 to 17.
Infrastructure setup, and deployment to AWS.
 SENIOR APIGEE ENGINEER
Ragnarök Group 07/2023 - 04/2024
Project description:
Web-based applications with customizations and configurations to
meet customer needs.
Responsibilities:
Migration from Apigee Edge to AWS API gateway and Apigee X;
Сreation of new APIs, migrations of old ones. Updating Java
services, creation of Jenkins jobs, deployment, and testing;
Preparation and implementation of product releases;
Support of other team members.

DEVELOPER AT FOUNDATIONAL SQUAD
EPAM Systems 04/2022 - 07/2023
Developer at the foundational squad that is responsible for
resolving common capabilities and complicated features
Migration of legacy data to the cloud. Development of Dataflow
pipelines for processing new incoming data
Conducting investigations on different levels
Integration with other teams, definition of technical processes
and requirements

KEY DEVELOPER
EPAM Systems 01/2021 - 01/2022
Development of a framework for processing PubSub messages,
testing, deployment, creating documentation
Integration of new clients. Support for the integration of other
teams
Maintenance of existing REST microservices. Adding new
functionality to them

DEVELOPER
EPAM Systems 07/2019 - 01/2021

Developed RESTful microservices from scratch
Troubleshooting bugs, code review, participation in technical
discussions
Creating Mulesoft and Apigee proxies for communication
between systems

EXTRA MILE
Mentorship of junior colleagues - Java Mentoring Program,
Microservices Fundamentals
Conducting technical interviews for the project
Volunteering at BEST Kyiv. In particular, the organization of two
large hackathons INT20H for students