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I'm Oleh Pihnastyi, a Senior Software Engineer based in Gdańsk, Poland. I bring 10+ years of experience designing, developing, and optimizing enterprise-grade software solutions. I enjoy turning complex requirements into robust, scalable systems and leading teams to deliver high-quality products. My focus includes building secure backend architectures, migrating data and services to cloud-native platforms (AWS, microservices), and exploring AI-enabled approaches such as machine learning and Generative AI. I thrive in cross-functional environments and value continuous learning, mentorship, and thoughtful, data-driven decision making.…I'm Oleh Pihnastyi, a Senior Software Engineer based in Gdańsk, Poland. I bring 10+ years of experience designing, developing, and optimizing enterprise-grade software solutions. I enjoy turning complex requirements into robust, scalable systems and leading teams to deliver high-quality products. My focus includes building secure backend architectures, migrating data and services to cloud-native platforms (AWS, microservices), and exploring AI-enabled approaches such as machine learning and Generative AI. I thrive in cross-functional environments and value continuous learning, mentorship, and thoughtful, data-driven decision making.

Oleh Pihnastyi

Full Stack Developer, App Developer, Game Developer, +2

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I'm Oleh Pihnastyi, a Senior Software Engineer based in Gdańsk, Poland. I bring 10+ years of experience designing, developing, and optimizing enterprise-grade software solutions. I enjoy turning complex requirements into robust, scalable systems and leading teams to deliver high-quality products. My focus includes building secure backend architectures, migrating data and services to cloud-native platforms (AWS, microservices), and exploring AI-enabled approaches such as machine learning and Generative AI. I thrive in cross-functional environments and value continuous learning, mentorship, and thoughtful, data-driven decision making.…I'm Oleh Pihnastyi, a Senior Software Engineer based in Gdańsk, Poland. I bring 10+ years of experience designing, developing, and optimizing enterprise-grade software solutions. I enjoy turning complex requirements into robust, scalable systems and leading teams to deliver high-quality products. My focus includes building secure backend architectures, migrating data and services to cloud-native platforms (AWS, microservices), and exploring AI-enabled approaches such as machine learning and Generative AI. I thrive in cross-functional environments and value continuous learning, mentorship, and thoughtful, data-driven decision making.

Available to hire

I’m Oleh Pihnastyi, a Senior Software Engineer based in Gdańsk, Poland. I bring 10+ years of experience designing, developing, and optimizing enterprise-grade software solutions. I enjoy turning complex requirements into robust, scalable systems and leading teams to deliver high-quality products.
My focus includes building secure backend architectures, migrating data and services to cloud-native platforms (AWS, microservices), and exploring AI-enabled approaches such as machine learning and Generative AI. I thrive in cross-functional environments and value continuous learning, mentorship, and thoughtful, data-driven decision making.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Ukrainian

Fluent

Russian

Advanced

English

Advanced

Polish

Beginner

Work Experience

Senior Software Engineer at Self-employed / Independent contractor

June 20, 2021 - July 20, 2025

Designed, developed, and optimized enterprise-grade software solutions. Led architecture across multiple back-end services, migrated monoliths to microservices on AWS, implemented secure, high-performance back ends, and improved CI/CD pipelines. Worked on data migrations, ETL tasks, and database redesigns; integrated machine learning and Generative AI components to improve product features. Mentored junior engineers, managed task assignments, and collaborated with product, security, and operations to meet complex technical and business requirements. Leveraged Docker and Kubernetes, JPA/Hibernate, Java, and Python to deliver scalable services; used Kafka for event-driven patterns; applied SQL (PostgreSQL/MySQL) and data warehousing practices; used Terraform for deployment; collaborated with QA teams; used JIRA for project management. Achieved measurable improvements in latency, throughput, and reliability; built secure authentication with IAM and AWS best practices.

Software Developer (Intern) at Kharkiv Polytechnic Institute – Faculty of Computer and Information Technologies

November 1, 2013 - December 1, 2015

Contributed to data loading and processing tasks; performed code reviews; learned modern mathematical methods for data mining and processing; supported migration tools and data source integration.

Software Developer at Kharkiv National University / Kharkiv Polytechnic Institute

December 1, 2015 - November 1, 2019

Developed modules for loading and processing data, implemented data sources for ETL, and participated in building migration strategies to support OLTP and data warehouses, with a focus on SQL-based data transformation.