Oleksandra Perevozniuk
London
Summary
Full-stack Software Engineer with 3+ years of experience building enterprise applications using Java, Kotlin, React, TypeScript, and PostgreSQL. Experienced in developing scalable APIs, modern user interfaces, and delivering production software throughout the full development lifecycle. Passionate about writing maintainable code, improving engineering processes, and leveraging AI-assisted development tools to increase productivity and code quality.
Overview
4
4
years of post-secondary education
3
3
years of professional experience
Work history
Software Engineer III
American Express
London
03.2025 - Current
- Developed and maintained full-stack applications using Java/Kotlin on the backend and React, TypeScript, and modern JavaScript on the frontend.
- Designed, implemented, and maintained complex REST APIs and backend services to support scalable business functionality.
- Worked with PostgreSQL to design queries, optimise database interactions, and support data-driven features.
- Leveraged GitHub Copilot and OpenAI Codex to accelerate software development by generating boilerplate code, creating tests, assisting with debugging, and improving developer productivity.
- Developed internal AI-assisted engineering workflows, including repository indexing, migration documentation, code review guidance, and documentation generation, reducing repetitive manual work for developers.
- Participated in the full software development lifecycle, including requirements analysis, technical design, implementation, code reviews, testing, deployment, and production support.
- Collaborated with cross-functional teams including product managers, designers, QA engineers, and other developers to deliver high-quality features.
Freelance AI Trainer (Developer)
DataAnnotation
04.2024 - 01.2025
- Developed and tested code in multiple programming languages (C, C++, Go, Python, Node.js, JavaScript, Typescript, Swift, SQL) to enhance AI systems' understanding of coding principles.
- Evaluated and optimised code through analysis of time and space complexity, improving algorithm design effectiveness.
- Implemented software development best practices, including clean code, debugging, and commenting, to facilitate AI learning in coding.
- Strengthened skills in analysing, documenting, and explaining technical concepts effectively.
Junior Fullstack Developer
ManholeMetrics Ltd.
London
09.2023 - 04.2024
- Developed and maintained a React/TypeScript dashboard displaying device data and statistics, improving operational efficiency by 25%.
- Managed dashboard settings for streamlined device control.
- Built and tested 10+ new features for Python/FastAPI backend services.
- Managed MongoDB and Redis, ensuring product reliability and functionality.
- Implemented an SMS alert system using the Twilio API, reducing customer response time by 30%.
- Developed an image delivery system with MinIO, handling hundreds of images efficiently.
- Independently developed a React Native app to interact with physical devices, enhancing user onboarding processes and reducing setup time by 40%.
Education
BSc - Applied Mathematics
Igor Sikorsky Kyiv Polytechnic Institute
Kyiv, Ukraine 09.2018 - 06.2022
Software Engineering Bootcamp - Software Engineering
BrainStation
London, UK 04.2023 - 06.2023
Skills
- Frontend: JavaScript, TypeScript, React, Vuejs, Recoil, HTML, CSS, Sass
- Backend: Python, Nodejs, Java, Kotlin, C, FastAPI, Redis, Celery, MongoDB, PostgreSQL, MySQL, Pydantic, Expressjs, JWT, Beanie, Motor, MinIO, Sendgrid
- Testing: PyTest, Jest, Enzyme, Cypress, React Testing Library
- Mobile Development: React Native, Expo, Swift
- AI development tools: Github Copilot, OpenAI Codex
- Other: VS Code, Git, Docker, Figma
- Certificates: UX Design (BrainStation)
SIDE PROJECTS
CheatsheetCLI - customisable command-line tool written in Python and designed to display programming cheatsheets in a visually engaging, easy-to-read format.
SimpleNotes - Chrome extension built with JavaScript, HTML, and CSS allowing users to drag and customise notes on web pages, with features like persistent storage, auto re-injection on page refresh, and tab switching`
Rentify - rental platform clone being built using Vue.js, Node.js and PostgreSQL.
Timeline
Software Engineer III
American Express
03.2025 - Current
Freelance AI Trainer (Developer)
DataAnnotation
04.2024 - 01.2025
Junior Fullstack Developer
ManholeMetrics Ltd.
09.2023 - 04.2024
Software Engineering Bootcamp - Software Engineering
BrainStation
04.2023 - 06.2023
BSc - Applied Mathematics
Igor Sikorsky Kyiv Polytechnic Institute
09.2018 - 06.2022