Ярослав

Full stack developer, 80 000 UAH

Considering positions:
Full stack developer, Backend-розробник, Web-програміст, Менеджер проєктів, Системний адміністратор, Программист микроконтроллеров, Оператор 3D-принтера, Тестувальник
Employment type:
full-time, part-time
Age:
28 years
City of residence:
Kyiv
Ready to work:
Kyiv, Remote

Contact information

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Work experience

Full stack developer

from 06.2024 to 04.2026 (1 year 11 months)
Code & Care, Дистанційно (IT)

Built a fintech project from scratch as a Full-Stack Developer using a microservices architecture, React Native, and AWS.

Developed and maintained the frontend of a sports mobile application built with React Native. Implemented support for multiple Bluetooth connections to collect athletes' data and display it to coaches in real time.

Designed and implemented AWS infrastructure for a Node.js microservices project using EC2, RDS, S3, and ElastiCache.

Improved the backend of an entertainment project by moving in-memory calculations to the database layer, improving performance and reducing application load.

Refactored and fixed unit tests to run reliably in local environments. Added test isolation to prevent interference between test cases, reducing execution time by approximately 50%.

Led and mentored a team of 4 developers, providing technical guidance, code reviews, and day-to-day support.

Back end developer

from 04.2023 to 04.2024 (1 year)
Feodal, Дистанційно (IT)

Increased the system's capacity from approximately 1,500 to over 10,000 GPS/OBD2 trackers processed simultaneously by migrating to a microservices architecture and enabling EC2 auto-scaling.

Improved system monitoring by integrating Grafana, making future performance analysis and optimization easier.

Migrated the queue system from Redis BullMQ to Kafka to support higher message throughput and more flexible processing.

Developed features for a vehicle tracking system, including route history, fuel monitoring, and vehicle telemetry.

Implemented field work calculation features using Turf.js.

Designed and optimized a microservices architecture for AWS deployment.

Reduced deployment time from one day to a few hours, including testing, by replacing manual deployment checklists with automated CI/CD pipelines.

Full stack developer

from 01.2020 to 05.2023 (3 years 5 months)
Itransition, Київ (IT)

Developed frontend applications using React and Next.js for major news websites, taking projects from Figma designs to production-ready applications.

Integrated frontend applications with APIs such as Strapi.
Collaborated directly with client-side managers to discuss requirements and technical solutions.

Developed new features and maintained an entertainment mobile application built with React Native and serverless technologies.

Developed backend services for a cybersecurity CRM system.

Full stack developer

from 01.2019 to 01.2020 (1 year)
Daxx, Київ (IT)

Refactored a large portion of the backend for a music festival website, replacing raw SQL queries with ORM-based implementations.

Fixed security-related issues across the application.

Refactored and normalized the database structure.

Added new frontend features.

Developed and maintained a CRM system for a large European marketplace.

Supported existing backend services.

Migrated selected services from Fastify to Express.

Back end developer PHP/Node.js

from 10.2018 to 12.2019 (1 year 3 months)
Webbylab, Київ (IT)

Write clear and scalable code
Write Fullstack websites
Write RESTfull API
Use SOLID principles while writing code
Communicate with customers

Back-end developer

from 12.2017 to 12.2018 (1 year)
Semalt, Київ (IT)

development of wp themes and plugins
writing js and php
SEO optimization

Tutor

from 01.2017 to 12.2017 (1 year)
It-stolica, Київ (Освіта, наука)

Education

Seneca

Computer networking and technical support, Toronto
Specialized secondary, from 2016 to 2016 (less than 1 year)

One semester of college

Additional education and certificates

2018, 3 month

Knowledge and skills

  • Git
  • SQL
  • C++
  • React Native
  • Electron
  • Docker
  • ESP32
  • Arduino IDE
  • ArduPilot
  • Адміністрування ОС Linux
  • Python
  • Raspberry pi

Language proficiencies

  • Ukrainian — fluent
  • English — above average

Additional information

Full-Stack Software Engineer focused on delivering scalable web and mobile applications from concept to production. Experienced in backend development with Node.js, frontend development with React and React Native, cloud architecture, and deployment automation. Enjoy solving complex technical challenges and building products that create real business value.

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