Paul

Paul Isaichuk
Kyiv, Ukraine
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Professional Summary
Senior Software Engineer with 12+ years of building both monolith and distributed systems.

Skills
• Java (17+) • Git, Bitbucket (+CI/CD on • Unix (MacOS, Linux, Bash)
• Spring (Core, AOP, MVC, Boot, github actions) • Testing (JUnit, TestNG,
Data) • SQL (MariaDB, Postgres) JMeter, Gattling, SonarQube)
• REST (Http, Postman) • AWS (Lambda, API Gateway, • Maven, Gradle
• GCP (PubSub, Artifacts, SM) SQS, Cloudwatch, DynamoDB, • Agile (Scrum, Kanban)
• ElasticSearch S3, Cloudformation)

Experience
Valtech, Kyiv
Senior Software Engineer (Mar 2023 - current)

Music Registration Application (within a larger distributed platform).
Primarily backend development with occasional frontend contributions. Implemented new features,
redesigned existing work ows. Signi cantly improved request performance by optimizing a critical
database query and full-reindexing pipeline, achieving up to 4x speed improvement.

Played a key role in transitioning the system from non-production to stable live operation, leading
scalability, concurrency control, and system resilience efforts. Successfully migrated 5M+ business-
critical documents with full audit compliance.

Tech stack: Java 17+, Spring, REST APIs, Hibernate/JDBC, PostgreSQL, ElasticSearch, Gradle,
JUnit, Docker, GCP (Pub/Sub, Secret Manager, Artifact Registry, Cloud Logging), ArgoCD,
Bitbucket.

CyberVision, Kyiv
Delivered multiple projects for a US Telecom client across backend, cloud, and frontend domains

Senior Java Dev (Dec 2020 - Dec 2022)

Built and maintained Serverless REST APIs with Monitoring/Alerting on AWS, targeting 99.95%
uptime.

Tech stack: Java 11+, Spring, JUnit, SonarQube, AWS (ApiGateway, Lambda, SQS, S3,

DynamoDB, CloudWatch, CloudFormation, Terraform), Bash, GitHub Actions (CI/CD),
JMeter, Gattling, Python

Java Full stack & Team Lead (Dec 2019 - Dec 2020)
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Front-end stack: JS, React/Redux, Jest, HTML/CSS/Less, GWT

Middle to Senior Java Dev (Jul 2016 - Dec 2019)

Dashboard REST API distributed backend system (20 pods) backed by RabbitMQ. My
responsibilities included:

• Support of existing codebase and implementing new features - countless API endpoints,
scheduled backend tasks, new distributed modules
• Implemented and owned a concurrent data validation and migration tool for distributed
databases - it worked for years with no errors
• Automated test coverage, code reviews, refactoring
• Daily meetings, architecture discussions, demos for devs teams and customers

Tech stack: Java 8/11, Spring, Spring Data, MariaDB, RabbitMQ, EC2, Json/XML, JUnit,
Postman, Jira, Jenkins, Con uence, Kanban/Scrum, IntelliJ, Swagger, OpenApi, MacOS

CyberVision, Kyiv
Software Engineer (Sep 2013 - May 2016)

Worked on BigData project for feed processing and management on Hadoop clusters:

• Implementation new test framework
• Refactoring and updating of existing test suites
• Daily meetings with international team
• Committing to Apache codebase (https://falcon.apache.org)
• Mentoring new teammates

Tech stack: Java 7/8, Selenium, TestNG, Maven, Git, Tomcat, Jenkins, Ubuntu/CentOS, IntelliJ,
Jira, Python, Angular JS, Hadoop (HDFS, Yarn, MapReduce etc), VMware

Education
Algorithms Course (Projector) Dec 2020

BSc, Software Engineering, Kyiv Polytechnic Institute May 2016

Bionic University Java Course Aug 2013

Computer Science, Institute of Special Communications and Information Protection Mar 2012

Kyiv Military Lyceum Jun 2009

Languages
Ukrainian, English (B2-C1)
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