Harold

Flutter developer, 65 000 UAH

Age:
29 years
City of residence:
Kyiv
Ready to work:
Remote

Contact information

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Work experience

Fullstack Developer

from 01.2025 to now (1 year 9 months)
Organaise, Remote (IT)

Improved and modernized an evolving scheduling product by revising older code and upgrading features
to newer standards.
Built responsive experiences across mobile, tablet, desktop, and web, and contributed backend-oriented
features using TypeScript and Firebase services.
Worked closely with product and engineering stakeholders on bug fixes, usability refinements, and release
quality.

Mobile engineer

from 08.2024 to 01.2025 (6 months)
Coast group, Remote (IT)

Delivered approximately 80 screens across Android, iOS, web, and desktop while iterating rapidly with
design and product stakeholders.
Integrated more than 45 REST API endpoints and managed complex response/state flows using Riverpod
and GetX.
Implemented a VOD SDK, offline caching workflows, and SaaS/payment flows including Paystack, Adapty,
and in-app purchases.

Mobile developer

from 07.2024 to 05.2026 (1 year 11 months)
Nervus, Remote (IT)

Built a creator-focused platform for talent showcases, audience voting, rewards, and retention-driven social
experiences.
Led product direction, Flutter implementation, backend/media planning, and monetization concepts across
challenge flows, leaderboards, and community engagement loops.

Flutter developer

from 03.2023 to 02.2024 (1 year)
Baqi, Remote (Finance, banking, and insurance)

Built complex responsive fintech UI and trading flows that translated live crypto and investment logic into
usable Flutter screens.
Integrated WebSockets for real-time crypto price updates with retry logic and resilient error handling.
Applied MVVM architecture to improve scalability, separation of concerns, and long-term maintainability.
Developed secure blockchain-related network calls for transfers and investment operations.
Protected API keys and sensitive data using encrypted storage, device keychains, and stronger security
workflows.

Mobile developer

from 07.2022 to 04.2025 (2 years 10 months)
Exam Scholars & MySchoolGist, Remote (IT)

Developed 30+ reusable UI components with robust API integration, focused on error handling, caching,
and network efficiency.
Embedded AI agents to assess student answers, grade theory responses, and surface strengths and
weaknesses inside learning modules.
Implemented CI/CD with GitHub Actions and Codemagic, plus encryption and secure workflows to protect
exam content.

Flutter developer

from 08.2021 to 11.2021 (4 months)
Storyy, Remote (IT)

Collaborated with business analysts, product designers, and backend developers to streamline delivery and
support business goals.
Worked in bi-weekly sprints, applied clean architecture practices, and built 30+ responsive pages across
mobile and web.
Integrated application features with backend APIs and AI-related product functionality.

Fullstack Developer

from 09.2020 to 05.2026 (5 years 9 months)
Hexar Labs, Remote (IT)

Built an AI-assisted trading product focused on helping users clone trader systems into structured playbooks, session frameworks, and repeatable execution workflows.
Designed the product direction around trader cloning, workflow automation, conviction-based trade
planning, and decision-support experiences for active market participants.
Extended the concept toward hands-free execution through automated EA integration, enabling strategy
logic to flow into more fully automated trading behaviour.
Led end-to-end product thinking across mobile UX, data structures, trader onboarding, market context
capture, and execution support.

Flutter developer

from 05.2019 to 12.2024 (5 years 8 months)
Shopurban, Remote (IT)

Built a multi-platform application for Windows and Android using Flutter and Dart.
Implemented offline capability with a local SQL database, plus online sync and backup workflows

Education

National Technical University of Ukraine

Mechanical and production engineering, Kyiv
Higher, from 2016 to 2021 (5 years)

Additional education and certificates

2018 6 months

2023, 12 months

Knowledge and skills

  • MVP Development
  • TypeScript
  • Flutter
  • Dart
  • Codex
  • figma
  • Riverpod
  • HTML
  • Python
  • Java
  • JavaScript
  • iOS development
  • Writing test cases
  • Unit testing
  • Integration testing
  • Continuous deployment
  • VS Code
  • GitHub Actions
  • GitHub
  • Firebase
  • AWS
  • CI/CD
  • Automation testing
  • AppsFlyer
  • store
  • RevenueCat
  • REST API
  • Google Cloud Platform
  • Google API
  • Telegram API
  • Postman
  • MySQL
  • NoSQL
  • Website development
  • Multithreaded programming
  • Mobile application design
  • Mobile application testing
  • Node.js
  • WebSocket
  • FCM
  • Payment processing
  • MVVM
  • Application of artificial intelligence
  • Responsive design
  • Performance optimization
  • Software Development Life Cycle

Language proficiencies

English — advanced

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