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Java backend developer with 6 years of professional experience, combining strong accounting & audit fundamentals with fintech-focused engineering. Experienced in building scalable RESTful services using Spring Boot and Hibernate, with a focus on payment integrations and data integrity in cloud environments.…

Olha Sych

Software Engineer, Back-End Developer, Web Developer, +2

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Java backend developer with 6 years of professional experience, combining strong accounting & audit fundamentals with fintech-focused engineering. Experienced in building scalable RESTful services using Spring Boot and Hibernate, with a focus on payment integrations and data integrity in cloud environments.…

Available to hire

Java backend developer with 6 years of professional experience, combining strong accounting & audit fundamentals with fintech-focused engineering. Experienced in building scalable RESTful services using Spring Boot and Hibernate, with a focus on payment integrations and data integrity in cloud environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Ukrainian

Fluent

English

Advanced

German

Beginner

Work Experience

Java Developer at Sombra

January 1, 2020 - April 30, 2026

Designed and developed scalable RESTful APIs using Java 17 and Spring Boot, maintaining existing backend services to ensure high availability and reliability. Spearheaded containerized deployments on Google Cloud Run to optimize serverless workflows and reduce infrastructure costs. Built integrations with global financial platforms (Xero, QuickBooks) and developed API integrations supporting fintech use cases. Managed complex relational database schemas and ensured safe migrations using Flyway with full data integrity during schema changes. Wrote unit and integration tests (JUnit, Mockito) to achieve high code coverage. Collaborated in Scrum ceremonies by translating international client business requirements into technical specifications.

Accountant / Auditor at Audit Plus, PE

January 1, 2012 - August 31, 2018

Provided accounting and audit expertise by applying knowledge of financial reporting, tax compliance, and auditing standards. Ensured high accuracy in financial calculations, bridging business logic with software requirements and fostering a detail-focused mindset used for bug prevention and correctness in engineering.