Влад

Vlad Servetnyk
Flutter Engineer & Tech Lead
Vinnytsia, Ukraine — open to remote, EU time zones · [open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) ·
[open contact info](look above in the "contact info" section)

SUMMARY
Flutter engineer with seven years building cross-platform mobile products, five of them leading teams as Tech Lead
while staying hands-on in the code. Shipped 20+ production applications across fintech, healthcare, on-demand
services and AI consumer apps. Recent work is full-stack: Flutter clients with Node.js backends, admin panels,
subscription billing and AI integration.
TECHNICAL SKILLS
Mobile Flutter, Dart, Flutter Web, React Native, Rive, custom animation
State management BLoC, Cubit, Riverpod, Provider, Redux
Architecture Clean Architecture, SOLID, OOP, MVVM, MVP, offline-first data layers
Backend & data Node.js, REST APIs, Dio, HTTP, Firebase, Supabase, Drift, Hive
Quality & delivery Unit and golden testing, CI/CD, Git, code review, mentoring; AI-assisted development with Cursor,
Codex, Claude Code
Languages Ukrainian — native; English — B1
EXPERIENCE
Flutter Developer & Tech Lead
Oct 2024 — Jul 2026
IdeaInYou — software development and outstaffing company
Chernivtsi, Ukraine (remote)
Tech lead and hands-on developer on a dating and social networking product: owned the architecture, led the
development team, and built the features and performance work described under Key Projects.
Flutter Developer & Tech Lead
Jul 2023 — Sep 2024
Fozeus — product company
Tallinn, Estonia (remote)
Tech lead on both products of the Fozeus ecosystem: Fozeus, a local social network, and Fozeus Finance, a
lightweight crypto wallet for use inside it.
Ran a team of five — three Flutter developers and two full-stack engineers across a Node.js backend and the web
front end — owning delivery, mentoring and every code review into the main branch.
Flutter Developer
Dec 2022 — Jul 2023
RVA Fintech Solutions — payment systems, tokenisation and DeFi outsourcing
Kyiv, Ukraine (remote)
Led the architecture and the development team on a mobile payment application, writing the secure payment
provider integrations myself.
Joined two further live products — a VPN client and a crypto wallet — learned each codebase, fixed defects, then
designed and shipped new functionality in both, including native work on the VPN tunnel.
Flutter Developer & Tech Lead
Dec 2020 — Dec 2022
Tess-IT — IT services and consulting · part-time
Vinnytsia, Ukraine
Tech lead and hands-on developer on Impacteers.club, a recruitment platform for hiring staff — reviewing code and
guiding the developers while shipping features myself.
Flutter Developer & Tech Lead
Oct 2020 — Mar 2022
Five Systems Development — partner company of Tess-IT
Vinnytsia, Ukraine
The broadest run of client work: a neobank admin panel built from scratch, DIGA and DIFA for doctor appointments
and COVID vaccination booking, Milmi food delivery, the FindMe remote-learning platform and Just-One-Chesed —
each taken from design through release, leading the team while writing production code.

Mobile Developer
Nov 2019 — Dec 2020
Rogmax — product company
Vinnytsia, Ukraine
First commercial role: built a React Native trading application and a local services booking platform end to end —
design, coding, testing and debugging — working directly with clients on requirements.
KEY PROJECTS
Fintech Payment Application — mobile wallet, transfers and transaction history
Role: Tech Lead and hands-on developer · Stack: Flutter, secure payment provider APIs, Clean Architecture
Key features: wallet and transaction management; integrations with secure payment provider APIs; performance
optimisation across the transaction flows.
What I owned: the architecture, the team and the code-quality bar, while writing the payment integrations myself.
Most complex feature: making payments safe to retry. A transaction had to be idempotent so that a retry, a double
tap or a lost response could not charge a customer twice, and the flow had to hold up under a security review —
which set the boundaries the architecture was built around.
Dating & Social Network App — matching, messaging and community feed
Role: Tech Lead and developer · Stack: Flutter, REST APIs, local database as offline cache, Clean Architecture
Key features: user matching, messaging, content sharing and community engagement in one product.
What I owned: the architecture, the development team, and the complex technical issues nobody else picked up.
Most complex feature: making the feed and the chat feel instant. Photos in the scrolling feed are warmed and
precached before they come into view rather than fetched on display, and opening a conversation renders from the
local database first, Telegram-style, with no visible loading — which made choosing the source of truth between the
local database and the API the real problem to solve. The feed holds a steady 60 fps while scrolling, and
conversations open immediately instead of waiting on the API.
Impact: live product with roughly 3,500 users.
Ride-hailing platform — paired passenger and driver apps
Role: Tech Lead and developer · Stack: Flutter, Google Maps, REST APIs, navigation
Key features: ride booking on the passenger side; the driver-side counterpart with navigation and driver-specific
tools; two clients kept consistent against one backend.
What I owned: technical direction and code review across both clients, plus hands-on work on performance,
navigation and the driver-side tools.
Most complex feature: a custom rendering layer over Google Maps. Instead of snapping each car marker to the
coordinate that just arrived, positions are interpolated and animated between updates, so markers glide and route
polylines redraw continuously rather than jumping; toll roads are drawn as a separate custom overlay; and map
redraws are decoupled from the surrounding UI so the screen does not rebuild on every frame. Cars that used to
jump between updates now move at a steady 60 fps.
VPN client — connection stability, security and privacy
Role: developer on an existing codebase · Stack: Flutter, OpenVPN, native iOS and Android code, platform channels
Most complex feature: the OpenVPN connection layer, written on the native side of both platforms and driven from
Flutter over platform channels, because the tunnel itself lives in the operating system's VPN service rather than in
the app. Holding that connection stable across network changes was the core of the work — in a VPN a dropped
tunnel is a leak, not an inconvenience.
Crypto Wallet — support and new capabilities on a live wallet
Role: developer joining an established team · Stack: Flutter, REST APIs
What I did: took on an unfamiliar production codebase, diagnosed and fixed the defects it came with, then designed
and shipped new wallet functionality on top.
Most complex feature: a heavily animated interface that had to stay smooth. The wallet used a large set of SVG
assets, and decoding them competed with the animations for the main thread, so the parsing was moved into
isolates and taken off the UI thread entirely. Key material was held in a custom secure storage layer rather than a
stock plugin.
Also shipped, among 20+ released products: AI Photo Filter, a subscription app transforming photos through a cloud
AI pipeline, built solo end to end — Flutter client, Node.js backend, admin panel and billing; an AI cat-sound translator
on the same stack; a neobank admin panel built from scratch as tech lead; the FindMe remote-learning platform,
carried by hand-written animation; plus healthcare booking, food delivery, recruitment and services-booking apps.
EDUCATION
Vinnytsia National Technical University
2016 — 2020
Bachelor's degree, Faculty of Infocommunications, Radio Electronics and Nanosystems
Vinnytsia, Ukraine