Oleksandra Shershen

Python Developer with solid experience building production-grade backend systems and microservice architectures, specializing in FastAPI, Django, and DRF for high-load REST APIs and asynchronous services. Built a microservice architecture from scratch to 20+ services, launching an MVP for a new e-commerce product within 5 months. Skilled in PostgreSQL, MongoDB, Redis, and Elasticsearch, with a focus on query optimization and caching strategies, and in building async systems with asyncio, aiohttp, and Celery/RabbitMQ for real-time inter-service communication.

Experienced with CI/CD and containerized deployments (Docker, Kubernetes), plus monitoring via Sentry, Grafana, and Kibana. Automated testing workflows for security devices, reducing manual QA effort and accelerating release cycles; developed desktop applications and scripts for mass production and calibration. Strong background in web scraping (BeautifulSoup4, Selenium, Scrapy) and data processing (NumPy, Pandas).

Comfortable with Git workflows and Agile collaboration using Jira and Confluence.

Python Engineer at ViyarTech (2025-10 – Present)

• Designed and implemented high-load REST CRUD APIs and service gateways within a microservice architecture spanning 20+ services
• Built asynchronous services using asyncio/aiohttp with task queues via Celery/RabbitMQ for real-time inter-service communication
• Optimized MongoDB, PostgreSQL, and Elasticsearch — query/schema/index tuning plus Redis caching to cut database load and API response times
• Wrote unit/integration tests (pytest, unittest) and refactored legacy APIs while preserving backward compatibility
• Containerized services with Docker, deployed to Kubernetes, and maintained CI/CD pipelines to streamline releases
• Developed production-grade backend services and internal corporate web applications
• Participated in code reviews, architectural discussions, and cross-team technical decisions

Python Developer at Ajax Systems (2024-09 – 2025-10)

• Implemented automated device testing with Pytest, optimizing the test environment for reliability and efficiency
• Developed desktop applications for automating mass production, device testing, and calibration of security, video, and smart-home devices
• Created auxiliary tools, scripts, algorithms, and APIs for integration with databases, third-party software, and cross-team systems
• Streamlined CI/CD processes with Jenkins, Docker, and TestRail, automating version management and workflows
• Applied BDD practices, designing rules for test scenarios and mentoring Manual QA engineers, increasing test coverage and reducing regression testing time

Software Engineer for Android at GlobalLogic (2023-09 – 2024-01)

• Collaborated with cross-functional teams to develop advanced in-car cockpit solutions using C++, AOSP, Java, JNI, and embedded systems
• Created innovative software features to enhance user experience and safety in automotive environments
• Implemented performance optimizations for a more responsive and efficient system
• Conducted rigorous testing and debugging to ensure software reliability and stability
• Developed and optimized embedded systems software for efficient operation within hardware constraints
• Worked closely with hardware engineers and software developers to deliver cohesive and user-friendly solutions
• Maintained comprehensive documentation to facilitate knowledge sharing and future development

C++ Developer at CHI Software (2022-08 – 2023-12)

• Assisted in the design, development, and maintenance of C++ applications under the guidance of senior developers
• Continuously applied software development best practices to ensure code quality and maintainability
• Participated in requirements gathering and translated them into development tasks
• Contributed to maintaining and refactoring codebases for improved readability and performance
• Identified and resolved bugs to ensure application stability
• Wrote and executed unit tests to validate code functionality
• Created and updated documentation for features, code changes, and processes
• Collaborated with senior developers, designers, and QA engineers for seamless project delivery
• Assisted in integrating C++ applications with third-party libraries and APIs

Bachelor in Computer Science – Kharkiv National University Of RadioElectronics (2021 – 2025)

Python Developer – Mate Academy (2024-03 – 2024-07)