Віталій

Vitalii Krochak
FLUTTER & FULL-STACK NODE.JS ENGINEER
Lviv, Ukraine Remote / Hybrid [відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») Telegram @Hornyan

PROFILE
Flutter engineer with 5+ years of commercial experience building and supporting mobile, desktop, and
enterprise applications across the complete delivery lifecycle. Strong background in Flutter, Dart, BLoC, REST
and GraphQL integrations, Firebase, SQL-based storage, offline synchronization, payments, deep linking, and
production troubleshooting. Full-stack experience includes developing Node.js and NestJS backend services
and APIs alongside Flutter client functionality. Comfortable owning features from requirements and technical
design through implementation, testing, release, and cross-functional communication.

CORE SKILLS
Flutter development
Flutter, Dart, BLoC, Cubit, GetIt, Dio, responsive UI, reusable components, Android, iOS, Windows, macOS
Node.js backend
Node.js, NestJS, JavaScript, REST APIs, service architecture, validation, error handling, client-server workflows
Data and integrations
GraphQL, REST, HTTP, JSON, XML, Firebase, Stripe SDK, deep linking, SQL, SQLite, Drift, offline synchronization
Engineering delivery
Architecture, requirements analysis, debugging, testing, code review, technical documentation, release preparation
Tools
Git, GitLab, Azure DevOps, Firebase, Postman, Crashlytics, Analytics, Figma

PROFESSIONAL EXPERIENCE
Senior Flutter Developer / KORAM
Dec 2024 - Jul 2026
Remote
Role and responsibilities: Owned business-critical Flutter features from requirements and technical analysis through
implementation, testing, defect resolution, and release. Coordinated workflows, constraints, progress, and fixes with
product, development, and QA.
Designed and maintained data flows for orders, appointments, delivery notes, proof-of-performance reports, on-site
documentation, and workforce records.
Built offline-first workflows with Drift and SQLite and synchronization logic that reconciled local and server data after
connectivity was restored.
Integrated REST services using JSON and XML payloads and created reusable networking, serialization, error-handling,
and data-processing components.
REST JSON XML SQL Drift SQLite Dio Flutter Dart BLoC Azure DevOps

Flutter Developer / Kozak Agency
Jan 2024 - Dec 2024
Remote
Role and responsibilities: Built Flutter and Node.js/NestJS functionality from an early product stage; clarified
requirements, implemented features and integrations, and supported testing and releases.
Built the application from initial setup and contributed to architecture, project structure, library selection, and
engineering practices.
Integrated REST APIs and implemented reusable networking, error-handling, and data-mapping components.
REST JSON Node.js NestJS JavaScript Flutter Dart Firebase SQL Git

Flutter Developer / WireSalad
Jun 2022 - Jul 2023
Remote
Role and responsibilities: Developed customer-facing Flutter apps from product ideas and designs through production
release, including planning, integrations, reusable components, debugging, and coordination with product, backend,
frontend, and QA.
Developed and maintained multiple production applications and contributed to architecture and technology selection.
Integrated GraphQL APIs, Firebase services, push notifications, analytics, local storage, and third-party services.
Implemented Stripe payment flows and deep linking for FaceYoga user journeys.
GraphQL Firebase Stripe SDK Deep Linking JSON Flutter Dart BLoC Dio Git

Junior Flutter Developer / CiGen
Apr 2021 - Jun 2022
Lviv, Ukraine
Role and responsibilities: Delivered mobile features and integrations across requirements, estimation, implementation,
testing, debugging, documentation, and release while communicating with the customer, project manager, developers,
and QA.
Integrated GraphQL APIs, Firebase services, notifications, analytics, local storage, and reusable components.
Clarified requirements and acceptance criteria with the project manager and customer, then communicated progress
and technical questions throughout implementation.
GraphQL Firebase JSON Flutter Dart BLoC Dio Crashlytics Analytics Git

EDUCATION
Master's Degree in Computer Science
Lviv Polytechnic National University
Sep 2023 - Jan 2025

Bachelor's Degree in Electronic Information and Computer Technologies
Lviv Polytechnic National University
2019 - 2023

LANGUAGES
English - Upper-Intermediate B2 Ukrainian - Native