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Oleksii Lytvyiuk Software Developer

CONTACT Phone: [открыть контакты](см. выше в блоке «контактная информация») Location: Warsaw, Poland / Lviv, Ukraine
Email: [открыть контакты](см. выше в блоке «контактная информация»)

Backend Software Engineer with strong experience in server-side development,
PROFESSIONAL
SUMMARY automation, and data-heavy backend systems. Proven track record of building RESTful APIs,
data ingestion and validation pipelines, and internal platforms used by non-technical teams.
Experienced with Python and Java, relational databases, cloud infrastructure, and CI/CD
pipelines. Strong focus on clean architecture, data integrity, and scalable backend design.

PROFESSIONAL Software Developer — Network360
EXPERIENCE Oct 2023 – Nov 2026 (Almost 3 years of exp)

Designed and implemented server-side backend services and automation scripts,
significantly reducing manual operational work.
Built and maintained RESTful APIs powering internal web applications used daily by
business and operations teams.
Architected and implemented data ingestion, normalization, and validation
pipelines handling large volumes of structured and semi-structured warehouse
data.
Developed a file-based upload system enabling external suppliers to upload files
with automatic validation and normalization.
Implemented hash-based deduplication and data integrity checks for uploaded
records and assets.
Worked extensively with relational databases (PostgreSQL, MS SQL Server), writing
optimized queries and enforcing data integrity.
Built and maintained CI/CD pipelines using GitLab.
Deployed and operated backend services on AWS (EC2, ECS, S3, Secrets Manager).
Collaborated closely with frontend developers, DevOps, and stakeholders across
the full development lifecycle.

TECHNICAL Programming Languages: Python, Java DevOps & Cloud: Docker, GitLab CI,
SKILLS Backend & API: RESTful API design, FastAPI, Spring Boot GitHub Actions, AWS (EC2, ECS, S3,
Databases & Persistence: PostgreSQL, MySQL, Secrets Manager)
MS SQL Server, Spring Data JPA, Hibernate, Security : Spring Security
SQLAlchemy Build : Maven
Collaboration & Workflow: Git, Jira, Confluence,
Agile/Scrum

EDUCATION Bachelor of Engineering (B. Eng) in Computer Science (Diploma Grade 4.5)
University : Polish-Japanese Academy of Information Technology, Warsaw

LANGUAGES English (B2+ IELTS)
Ukrainian
Russian